SpringMVC-整合SSM

整合SSM

目录

1. 设计流程

graph LR id1[需求分析] id2[设计数据库] id3[业务] id4[前端页面] id1 --> id2 id2 --> id3 id3 --> id4

2. 创建一个数据库表

CREATE DATABASE ssmbuild;
USE ssmbuild;
CREATE TABLE `books`(
`bookID` INT NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID`(`bookID`)
)ENGINE=INNODB DEFAULT CHARSET=utf8;

INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

3. 配置依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.wang</groupId>
    <artifactId>ssmBuild</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--依赖: junit, 数据库驱动, 连接池, servlet, jsp, mybatis, mybatis-spring, spring-->
    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>

        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

        <!--数据库连接池:  c3p0-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet JSP jstl 标准标签库(standard)-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl-api</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>

        <!--mybatis mybatis-spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>

        <!--Spring(MVC JDBC)-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>

        <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
    </dependencies>

    <!--静态资源导出-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>false</filtering>
            </resource>

            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

</project>

4. 准备项目框架

  • 在java目录下新建

    • dao
    • pojo
    • service
    • controller

  • 在resource目录下配置mybatis和spring的核心配置文件

    • mybatis-config.xml
    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!--配置数据源, 交给Spring去做-->

    <!--设置别名-->

    <!--映射Mapper-->

</configuration>
    • applicationContext.xml
    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

  • 在resource目录下写数据库的配置文件database.properties

jdbc.driver = com.mysql.jdbc.Driver
# 如果使用的是MySQL8.0+, 增加一个时区的配置: &serverTimezone=Asia/Shanghai
jdbc.url = jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username = root
jdbc.password = 123456

5. Mybatis层

1. 编写实体类

package com.wang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

}

2. 编写Mapper接口和xml

1. Mapping接口

package com.wang.dao;

import com.wang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapping {

    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(@Param("bookID") int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(@Param("bookID") int id);

    //查询全部的书
    List<Books> queryAllBook();
}

2. Mapping.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wang.dao.BookMapping">

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        VALUES (#{bookName}, #{bookCounts}, #{detail});
    </insert>

    <delete id="deleteBookById" parameterType="_int">
        delete from ssmbuild.books where bookID = #{bookID};
    </delete>

    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName}, bookCounts = #{bookCounts}, detail = #{detail}
        where bookID = #{bookID};
    </update>

    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books where bookID = #{bookID};
    </select>

    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books;
    </select>


</mapper>

注意

编写接口时, 属性为基本类型时要加上@Param("")注解, 同时此注解可以解决属性名与数据库的字段名不一致的问题

3. 编写Service层

1. 接口

package com.wang.service;

import com.wang.pojo.Books;

import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(int id);

    //查询全部的书
    List<Books> queryAllBook();
}

2. 实现类

package com.wang.service;

import com.wang.dao.BookMapper;
import com.wang.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{

    //service层 调 dao层: 组合dao
    private BookMapping bookMapping;

    //添加setter, Spring可以直接注入到mapper
    public void setBookMapping(BookMapping bookMapping) {
        this.bookMapping = bookMapping;
    }

    @Override
    public int addBook(Books books) {
        return bookMapping.addBook(books);
    }

    @Override
    public int deleteBookById(int id) {
        return bookMapping.deleteBookById(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapping.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapping.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapping.queryAllBook();
    }
}

注意

  • 此处Service层与Dao层的接口基本一致, 但是这样做实现了分层解耦, 方便之后添加一些业务
  • 在Service的实现类中, 调用dao, 同时对导入的dao编写一个Setter, 方便之后的Spring注入

4. 完善Mybatis核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!--配置数据源, 交给Spring去做-->

    <!--设置别名-->
    <typeAliases>
        <typeAlias type="com.wang.pojo.Books" alias="Books"/>
    </typeAliases>

    <!--映射Mapper-->
    <mappers>
        <mapper resource="com/wang/dap/BookMapping.xml"/>
    </mappers>

</configuration>

6. Spring层

1. 配置Spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1. 关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2. 连接池
        dbcp:   半自动化操作, 不能自动连接
        c3p0:   自动化操作(自动化的加载配置文件, 并且可以自动配置到对象中!)
        druid:
        hikari: SpringBoot 2.X自带的
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!--从properties中取出四个要素-->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!--c3p0连接池的私有属性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动commit-->
        <property name="autoCommitOnClose" value="false"/>
        <!--获取连接超时时间-->
        <property name="checkoutTimeout" value="10000"/>
        <!--当获取失败重新尝试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--3. SQLSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--引用数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4. 配置dao接口扫描包, 动态的实现了Dao接口可以注入到Spring容器中!-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的dao包-->
        <property name="basePackage" value="com.wang.dao"/>
    </bean>

</beans>

注意

  • 关于Spring包扫描后的类的名字
    • 如果连着两个大写的字母开头，则扫描进来的bean就是大写开头的；
      如果大写开头，后面跟小写，则扫描进来的是小写开头的
  • Spring-dao.xml要放在applicationContext的同一个上下文中, 可以在项目结构的module中配置, 也可以在applicationContext中导入

2. 配置Spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1. 扫描Service下的包-->
    <context:component-scan base-package="com.wang.service"/>

    <!--2. 将我们的所有业务类注入到Spring, 可以通过配置或者注解实现-->
    <bean id="BookServiceImpl" class="com.wang.service.BookServiceImpl">
        <!--由于在BookServiceImpl中添加了bookMapper的实现类; 同时, 我们在Spring-dao中设置了自动扫描dao下的包, 因此我们可以直接注入-->
        <property name="bookMapping" ref="bookMapping"/>
    </bean>

    <!--3. 声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--4. aop事务支持(要使用aop要导入织入包)-->


</beans>

注意

  • Spring-service.xml要放在applicationContext的同一个上下文中, 可以在项目结构的module中配置, 也可以在applicationContext中导入

3. 配置applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="Spring-dao.xml"/>
    <import resource="Spring-service.xml"/>

</beans>

7. SpringMVC层

1. 添加web框架

2. 编写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session:    配置Session过期时间为15分钟-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

注意

  • 在DispatcherServlet中的url-pattern为 /
  • 在filter中的url-pattern为 */

3. 配置Spring-mvc

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/cache/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 1.注解驱动-->
    <mvc:annotation-driven/>

    <!-- 2.静态资源过滤-->
    <mvc:default-servlet-handler/>

    <!-- 3.扫描包: controller-->
    <context:component-scan base-package="com.wang.controller"/>

    <!-- 4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 5.如果要使用Jackson, 要配置统一处理乱码的问题!-->

</beans>

注意

  • 配置时的约束注意结尾为mvc, 同时, .xsd中间也要改成mvc
  • 视图解析器配置前缀时注意开头和结尾的 /
  • 如果要使用JackSon, 在此处配置解决乱码问题

4. 配置applicationContext.xml

将SpringMVC的配置文件引入总的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="Spring-dao.xml"/>
    <import resource="Spring-service.xml"/>
    <import resource="Spring-mvc.xml"/>

</beans>

5. 添加库并配置Tomcat

在项目结构下的Artfact中, 添加一个lib目录, 将所有的库放入这个lib目录下

8. 如果出现bean不存在的排错思路

  1. 查看这个bean是否注入成功! ==> idea中能跳转则成功
  2. Junit单元测试, 看我们的代码是否能查询出结果!
  3. 如果上面都没有问题, 则问题一定不在我们的底层, 是Spring出了问题!
  4. SpringMVC, 整合的时候没有调用我们的service层的bean:
    1. applicationContext.xml 没有注入bean
    2. web.xml中, 我们也绑定过配置文件! 看配置文件是否绑全!(applicationContext.xml)

9. 查询全部书籍

1. 在controller中添加功能

package com.wang.controller;

import com.wang.pojo.Books;
import com.wang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    //controller层 调 service 层
    //这里使用Qualified, 指定了注入BookServiceImpl, 避免了自动装配注入对象模糊的问题
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍, 并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();

        model.addAttribute("list", list);
        return "allBook";
    }

}

2. 修改并美化主页

<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/9
  Time: 16:40
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>

    <style>
      a {
        text-decoration: none;
        color: black;
        font-size: 18px;
      }
      h3 {
        width: 180px;
        height: 38px;
        margin: 100px auto;
        text-align: center;
        line-height: 38px;
        background: deepskyblue;
        border-radius: 5px;
      }
    </style>

  </head>
  <body>

  <h3>
    <%--此处要写${pageContext.request.contextPath}  后面的写绝对地址, 方便项目运行!--%>
    <a href="${pageContext.request.contextPath}/book/allBook">进入到书籍页面</a>
  </h3>

  </body>
</html>

3. 利用BootStrap和jstl美化并完成书籍查询页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/9
  Time: 17:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 显示所有书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12">
            <table class="table table-hover table-striped">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                    </tr>
                </thead>

                <%--书籍从数据库中查询出来, 从这个list遍历出来 : foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

</body>
</html>

10. 添加书籍

1. 在查询所有书籍的页面中添加跳转添加书籍的按钮

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/9
  Time: 17:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 显示所有书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12">
            <table class="table table-hover table-striped">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                    </tr>
                </thead>

                <%--书籍从数据库中查询出来, 从这个list遍历出来 : foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

    <%--增加书籍的按钮--%>
    <div class="row clearfix">
        <div class="row">
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <a href="${pageContext.request.contextPath}/book/toAddBook" class="btn btn-primary">
                    新增书籍
                </a>
            </div>
        </div>
    </div>
</div>

</body>
</html>

2. 在controller中添加跳转和添加的功能

package com.wang.controller;

import com.wang.pojo.Books;
import com.wang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    //controller层 调 service 层
    //这里使用Qualified, 指定了注入BookServiceImpl, 避免了自动装配注入对象模糊的问题
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍, 并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();

        model.addAttribute("list", list);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPage() {
        return "addBook";
    }

    //添加书籍的请求
    @RequestMapping("/addBook")
    public String addBook(Books books) {
        System.out.println("allBook ==> " + books);
        bookService.addBook(books);
        //重定向到allBook查询
        return "redirect:/book/allBook";
    }

}

注意

  • 在jsp中添加了点击会跳转到/book/toAddBook的按钮, 这里会进一步跳转到addBook页面

  • /book/addBook是添加书籍的地址, 表单要提交到这里来处理!

  • 添加之后, 要重定向到查询全部书籍, 使用 return "redirect:/book/allBook";

3. 设计添加书籍的页面

<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/10
  Time: 14:00
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 新增书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <%--此处的label中的for标签对应下面input标签中的id, 这样点击label就可以直接到input!--%>
            <label for="bookName">书籍名称:</label>
             <%--input中的name要与实体类中的一致!--%>
            <input type="text" class="form-control" id="bookName" name="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量:</label>
            <input type="text" class="form-control" id="bookCounts" name="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍描述:</label>
            <input type="text" class="form-control" id="detail" name="detail" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="添加">
        </div>
    </form>

</div>

</body>
</html>

注意

  • label中的for标签对应下面input标签中的id, 这样点击label就可以直接到input
  • form表单中, 各个标签的name属性的值为后端取到的属性的名称(getParameter("XXX")).submit提交后,我们使用Mybatis和SpringMVC可以直接取出其中的值(返回的属性会封装在对象中)
  • name属性要与pojo中的属性名完全一致!

11. 修改和删除书籍

1. 修改书籍查询页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/9
  Time: 17:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 显示所有书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12">
            <table class="table table-hover table-striped">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作</th>
                    </tr>
                </thead>

                <%--书籍从数据库中查询出来, 从这个list遍历出来 : foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <%--通过a标签携带参数 ==> 使用?参数名=${参数值}--%>
                                <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <%--通过a标签携带参数 ==> 此处使用RestFul风格--%>
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

    <%--增加书籍的按钮--%>
    <div class="row clearfix">
        <div class="row">
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <a href="${pageContext.request.contextPath}/book/toAddBook" class="btn btn-primary">
                    新增书籍
                </a>
            </div>
        </div>
    </div>
</div>

</body>
</html>

注意

  • 前端向后端传递参数, 如果不是表单的话, 通过a标签, 携带参数的URL

2. 在controller中添加跳转和修改以及删除的功能

package com.wang.controller;

import com.wang.pojo.Books;
import com.wang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    //controller层 调 service 层
    //这里使用Qualified, 指定了注入BookServiceImpl, 避免了自动装配注入对象模糊的问题
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍, 并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();

        model.addAttribute("list", list);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPage() {
        return "addBook";
    }

    //添加书籍的请求
    //由于提交了表单, 可以接收到一个Books对象
    @RequestMapping("/addBook")
    public String addBook(Books books) {
        bookService.addBook(books);
        //重定向到allBook查询
        return "redirect:/book/allBook";
    }

    //跳转到修改页面
    //在前端中提交了id数据, 这里可以接收到(使用老版的方法)
    //Model用来将其带给前端
    @RequestMapping("/toUpdateBook")
    public String toUpdatePage(int id, Model model) {
        Books books = bookService.queryBookById(id);
        model.addAttribute("queryResult", books);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books) {
        bookService.updateBook(books);
        return "redirect:/book/allBook";
    }

    //删除书籍
    @RequestMapping("/deleteBook/{bookID}")
    public String deleteBook(@PathVariable("bookID") int id) {
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

}

注意

  • 由于前端使用url向后端传递了参数, 保证属性名一致的情况下可以直接取到
  • Model对象用于将后端处理的结果传递给前端(相当于setAttribute), 这里使用addAtrribute("属性名", 对象)方法, 在前端使用${"属性名"}即可取出!

3. 设计修改书籍的页面

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/10
  Time: 15:17
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 修改书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <div class="form-group">
            <%--此处的label中的for标签对应下面input标签中的id, 这样点击label就可以直接到input!--%>
            <label for="bookName">书籍名称:</label>
            <%--input中的name要与实体类中的一致!--%>
            <%--value为文本框中显示的值, 这里从后台返回的对象中取出对应的字段--%>
            <input type="text" class="form-control" id="bookName" name="bookName" value="${queryResult.bookName}" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量:</label>
            <input type="text" class="form-control" id="bookCounts" name="bookCounts" value="${queryResult.bookCounts}" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍描述:</label>
            <input type="text" class="form-control" id="detail" name="detail" value="${queryResult.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
        <%--此处修改要传递bookID, 同时此属性不应该被修改, 因此要使用隐藏域--%>
        <input type="hidden" name="bookID" value="${queryResult.bookID}">
    </form>


</div>

</body>
</html>

注意

  • input标签中, value为文本框中显示的值

  • 需要从前端传递到后端但是不想让用户看到的值, 使用隐藏域

    <%--此处修改要传递bookID, 同时此属性不应该被修改, 因此要使用隐藏域--%>
<input type="hidden" name="bookID" value="${queryResult.bookID}">

12. 搜索功能

添加一个通过书籍名称搜索书籍的功能

设计思路从下到上(dao ---> service ---> controller), 这样就方便修改

1. 修改前端页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Wang
  Date: 2020/9/9
  Time: 17:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <%--BootStrap美化页面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>

<%--栅格--%>
<div class="container">
    <%--清除浮动--%>
    <div class="row clearfix">
        <%--分屏12份--%>
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>
                        书籍列表 —————————————————— 显示所有书籍
                    </small>
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12">
            <table class="table table-hover table-striped">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作</th>
                    </tr>
                </thead>

                <%--书籍从数据库中查询出来, 从这个list遍历出来 : foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <%--通过a标签携带参数 ==> 使用?参数名=${参数值}--%>
                                <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <%--通过a标签携带参数 ==> 此处使用RestFul风格--%>
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

    <%--增加书籍的按钮--%>
    <div class="row clearfix">
        <div class="row">
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <a href="${pageContext.request.contextPath}/book/toAddBook" class="btn btn-primary">
                    新增书籍
                </a>

                <%--显示全部书籍--%>
                <a href="${pageContext.request.contextPath}/book/allBook" class="btn btn-primary">
                    显示全部书
                </a>
            </div>

            <div class="col-md-4 column"></div>

            <div class="col-md-8 column">
                <%--查询书籍, style="float: right"为向右浮动--%>
                <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right" class="form-inline">
                    <span style="color: red; font-weight: bold">${error}</span>
                    <%--placeholder为默认显示的值--%>
                    <input type="text" placeholder="请输入要查询的书籍" class="form-control" name="queryBookName">
                    <input type="submit" value="查询" class="btn btn-primary">
                </form>
            </div>
        </div>
    </div>
</div>

</body>
</html>

注意

  • 如果想要贴边, 需要写浮动 style="float: right"

2. 在dao层中添加功能

package com.wang.dao;

import com.wang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapping {

    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(@Param("bookID") int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(@Param("bookID") int id);

    //查询全部的书
    List<Books> queryAllBook();

    //搜索书籍
    Books queryBookByName(@Param("bookName") String bookName);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wang.dao.BookMapping">

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        VALUES (#{bookName}, #{bookCounts}, #{detail});
    </insert>

    <delete id="deleteBookById" parameterType="_int">
        delete from ssmbuild.books where bookID = #{bookID};
    </delete>

    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName}, bookCounts = #{bookCounts}, detail = #{detail}
        where bookID = #{bookID};
    </update>

    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books where bookID = #{bookID};
    </select>

    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books;
    </select>

    <select id="queryBookByName" resultType="Books">
        select * from ssmbuild.books where bookName = #{bookName};
    </select>


</mapper>

3. 在service层中添加功能

package com.wang.service;

import com.wang.pojo.Books;

import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(int id);

    //查询全部的书
    List<Books> queryAllBook();

    //搜索书籍
    Books queryBookByName(String bookName);
}

package com.wang.service;

import com.wang.dao.BookMapping;
import com.wang.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{

    //service层 调 dao层: 组合dao
    private BookMapping bookMapping;

    //添加setter, Spring可以直接注入到mapper
    public void setBookMapping(BookMapping bookMapping) {
        this.bookMapping = bookMapping;
    }

    @Override
    public int addBook(Books books) {
        return bookMapping.addBook(books);
    }

    @Override
    public int deleteBookById(int id) {
        return bookMapping.deleteBookById(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapping.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapping.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapping.queryAllBook();
    }

    @Override
    public Books queryBookByName(String bookName) {
        return bookMapping.queryBookByName(bookName);
    }
}

4. 在controller层中添加功能

package com.wang.controller;

import com.wang.pojo.Books;
import com.wang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    //controller层 调 service 层
    //这里使用Qualified, 指定了注入BookServiceImpl, 避免了自动装配注入对象模糊的问题
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍, 并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();

        model.addAttribute("list", list);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPage() {
        return "addBook";
    }

    //添加书籍的请求
    //由于提交了表单, 可以接收到一个Books对象
    @RequestMapping("/addBook")
    public String addBook(Books books) {
        bookService.addBook(books);
        //重定向到allBook查询
        return "redirect:/book/allBook";
    }

    //跳转到修改页面
    //在前端中提交了id数据, 这里可以接收到(使用老版的方法)
    //Model用来将其带给前端
    @RequestMapping("/toUpdateBook")
    public String toUpdatePage(int id, Model model) {
        Books books = bookService.queryBookById(id);
        model.addAttribute("queryResult", books);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books) {
        bookService.updateBook(books);
        return "redirect:/book/allBook";
    }

    //删除书籍
    @RequestMapping("/deleteBook/{bookID}")
    public String deleteBook(@PathVariable("bookID") int id) {
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

    //查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName, Model model) {
        Books books = bookService.queryBookByName(queryBookName);
        List<Books> list = new ArrayList<>();
        list.add(books);

        //如果查询不存在, 返回全部书籍
        if(books == null) {
            list = bookService.queryAllBook();
            model.addAttribute("error", "未查到该书籍");
        }
        model.addAttribute("list", list);
        return "/allBook";
    }

}

注意

  • 为了复用查询的前端页面, 这里将查询结果封装为list, 传回前端页面即可使用!

  • 这里存在查询不存在的情况, 要考虑查询失败的响应

  • 失败后, 如果想返回全部的列表, 只需要将list放入全部书籍即可

posted @ 2020-09-10 17:44  山人西来  阅读(381)  评论(1)  编辑  收藏  举报