Ssm整合

整合SSM框架

环境要求

环境：

• IDEA
• MySQL 5.7.19
• Tomcat 9

• Maven 3.6

  要求：

• 需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) 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');

基本环境搭建

1. 新建一Maven项目！ssmbuild ， 添加web的支持

2. 导入相关的pom依赖！

<dependencies>
   <!--Junit-->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</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 -->
   <dependency>
       <groupId>com.mchange</groupId>
       <artifactId>c3p0</artifactId>
       <version>0.9.5.2</version>
   </dependency>
   <!--Servlet - JSP -->
   <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</groupId>
       <artifactId>jstl</artifactId>
       <version>1.2</version>
   </dependency>
   <!--Mybatis-->
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.5.2</version>
   </dependency>
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>2.0.2</version>
   </dependency>
   <!--Spring-->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-webmvc</artifactId>
       <version>5.1.9.RELEASE</version>
   </dependency>
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-jdbc</artifactId>
       <version>5.1.9.RELEASE</version>
   </dependency>
</dependencies>

　　3.Maven资源过滤设置

<build>
<resources>
<resource>
             <directory>${basedir}/src/main/webapp</directory>
         </resource>
         <resource>
             <directory>${basedir}/src/main/resources</directory>
         </resource>
         <resource>
             <directory>${basedir}/src/main/java</directory>
             <includes>
                 <include>**/*.xml</include>
                 <include>**/*.properties</include>
             </includes>
         </resource>
</resources>
</build>

　　4.建立基本结构和配置框架！

• com.xiaowu.pojo

• com.xiaowu.dao

• com.xiaowu.service

• com.xiaowu.controller

• 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>
</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>

Mybatis层编写

1. 数据库配置文件 database.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=admin

2. IDEA关联数据库
3. 编写MyBatis的核心配置文件

  <?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>
     <typeAliases>
         <package name="nuc.ss.pojo"/>
     </typeAliases>
     <mappers>
         <mapper resource="nuc/ss/dao/BookMapper.xml"/>
     </mappers>
  </configuration>

4. 编写数据库对应的实体类 nuc.ss.pojo.Books（使用lombok插件！）

  package nuc.ss.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;
  }

5. 编写Dao层的 Mapper接口！

  package nuc.ss.dao;
  import nuc.ss.pojo.Books;
  import java.util.List;
  public interface BookMapper {
     //增加一个Book
     int addBook(Books book);
     //根据id删除一个Book
     int deleteBookById(int id);
     //更新Book
     int updateBook(Books books);
     //根据id查询,返回一个Book
     Books queryBookById(int id);
     //查询全部Book,返回list集合
     List<Books> queryAllBook();
  }

6. 编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

  <?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE mapper
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  <mapper namespace="nuc.ss.dao.BookMapper">
     <!--增加一个Book-->
     <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName,bookCounts,detail)
        values (#{bookName}, #{bookCounts}, #{detail})
     </insert>
     <!--根据id删除一个Book-->
     <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookID}
     </delete>
     <!--更新Book-->
     <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
        where bookID = #{bookID}
     </update>
     <!--根据id查询,返回一个Book-->
     <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books
        where bookID = #{bookID}
     </select>
     <!--查询全部Book-->
     <select id="queryAllBook" resultType="Books">
        SELECT * from ssmbuild.books
     </select>
  </mapper>

7. 编写Service层的接口和实现类

接口：

  package nuc.ss.service;
  import nuc.ss.pojo.Books;
  import java.util.List;
  //BookService:底下需要去实现,调用dao层
  public interface BookService {
     //增加一个Book
     int addBook(Books book);
     //根据id删除一个Book
     int deleteBookById(int id);
     //更新Book
     int updateBook(Books books);
     //根据id查询,返回一个Book
     Books queryBookById(int id);
     //查询全部Book,返回list集合
     List<Books> queryAllBook();
  }

实现类：

  package nuc.ss.service;
  import nuc.ss.dao.BookMapper;
  import nuc.ss.pojo.Books;
  import java.util.List;
  public class BookServiceImpl implements BookService {
     //调用dao层的操作，设置一个set接口，方便Spring管理
     private BookMapper bookMapper;
     public void setBookMapper(BookMapper bookMapper) {
         this.bookMapper = bookMapper;
    }
     public int addBook(Books book) {
         return bookMapper.addBook(book);
    }
     public int deleteBookById(int id) {
         return bookMapper.deleteBookById(id);
    }
     public int updateBook(Books books) {
         return bookMapper.updateBook(books);
    }
     public Books queryBookById(int id) {
         return bookMapper.queryBookById(id);
    }
     public List<Books> queryAllBook() {
         return bookMapper.queryAllBook();
    }
  }

OK，到此，底层需求操作编写完毕！

Spring层

1. 配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

2. 我们去编写Spring整合Mybatis的相关的配置文件；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">
   <!-- 配置整合mybatis -->
   <!-- 1.关联数据库文件 -->
   <context:property-placeholder location="classpath:database.properties"/>
   <!-- 2.数据库连接池 -->
   <!--数据库连接池
       dbcp 半自动化操作 不能自动连接
       c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
   -->
   <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
       <!-- 配置连接池属性 -->
       <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"/>
       <!-- 当获取连接失败重试次数 -->
       <property name="acquireRetryAttempts" value="2"/>
   </bean>
   <!-- 3.配置SqlSessionFactory对象 -->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <!-- 注入数据库连接池 -->
       <property name="dataSource" ref="dataSource"/>
       <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
       <property name="configLocation" value="classpath:mybatis-config.xml"/>
   </bean>
   <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
   <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <!-- 注入sqlSessionFactory -->
       <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
       <!-- 给出需要扫描Dao接口包 -->
       <property name="basePackage" value="com.hyc.mapper"/>
   </bean>
</beans>

　　3.Spring整合service层

<?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
   http://www.springframework.org/schema/context/spring-context.xsd">
   <!-- 扫描service相关的bean -->
   <context:component-scan base-package="com.hyc.service" />
   <!--BookServiceImpl注入到IOC容器中-->
   <bean id="BookServiceImpl" class="com.hyc.service.BookServiceImpl">
       <property name="bookMapper" ref="bookMapper"/>
   </bean>
   <!-- 配置事务管理器 -->
   <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <!-- 注入数据库连接池 -->
       <property name="dataSource" ref="dataSource" />
   </bean>
</beans>

SpringMVC层

1.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>DispatcherServlet</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <init-param>
       <param-name>contextConfigLocation</param-name>
       <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->  
       <param-value>classpath:applicationContext.xml</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
   <servlet-name>DispatcherServlet</servlet-name>
   <url-pattern>/</url-pattern>
</servlet-mapping>

<!--encodingFilter-->

<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>

</web-app>

2. **spring-mvc.xml**
   ```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"
         xmlns:mvc="http://www.springframework.org/schema/mvc"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/mvc
      https://www.springframework.org/schema/mvc/spring-mvc.xsd">
      <!-- 配置SpringMVC -->
      <!-- 1.开启SpringMVC注解驱动 -->
      <mvc:annotation-driven />
      <!-- 2.静态资源默认servlet配置-->
      <mvc:default-servlet-handler/>
      <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
          <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
          <property name="prefix" value="/WEB-INF/jsp/" />
          <property name="suffix" value=".jsp" />
      </bean>
      <!-- 4.扫描web相关的bean -->
      <context:component-scan base-package="com.hyc.controller" />
   </beans>

Spring配置整合文件，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"/>
   <import resource="spring-mvc.xml"/>
</beans>

配置文件，暂时结束！

Controller 和 视图层编写

1. BookController 类编写 ， 方法一：查询全部书籍

@Controller
@RequestMapping("/book")
public class BookController {
   @Autowired
   @Qualifier("BookServiceImpl")
   private BookService bookService;
   @RequestMapping("/allBook")
   public String list(Model model) {
       List<Books> list = bookService.queryAllBook();
       model.addAttribute("list", list);
       return "allBook";
  }
}

　　2.编写首页 index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
   <title>首页</title>
   <style type="text/css">
       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: 4px;
      }
   </style>
</head>
<body>
<h3>
   <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
</h3>
</body>
</html>

　　3.书籍列表页面 allbook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
   <title>书籍列表</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- 引入 Bootstrap -->
   <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
   <div class="row clearfix">
       <div class="col-md-12 column">
           <div class="page-header">
               <h1>
                   <small>书籍列表 —— 显示所有书籍</small>
               </h1>
           </div>
       </div>
   </div>
   <div class="row">
       <div class="col-md-4 column">
           <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增</a>
       </div>
   </div>
   <div class="row clearfix">
       <div class="col-md-12 column">
           <table class="table table-hover table-striped">
               <thead>
               <tr>
                   <th>书籍编号</th>
                   <th>书籍名字</th>
                   <th>书籍数量</th>
                   <th>书籍详情</th>
                   <th>操作</th>
               </tr>
               </thead>
               <tbody>
               <c:forEach var="book" items="${requestScope.get('list')}">
                   <tr>
                       <td>${book.getBookID()}</td>
                       <td>${book.getBookName()}</td>
                       <td>${book.getBookCounts()}</td>
                       <td>${book.getDetail()}</td>
                       <td>
                           <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |
                           <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
                       </td>
                   </tr>
               </c:forEach>
               </tbody>
           </table>
       </div>
   </div>
</div>

　　4.BookController 类编写 ， 方法二：添加书籍

@RequestMapping("/toAddBook")
public String toAddPaper() {
   return "addBook";
}
@RequestMapping("/addBook")
public String addPaper(Books books) {
   System.out.println(books);
   bookService.addBook(books);
   return "redirect:/book/allBook";
}

　　5.添加书籍页面：addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
   <title>新增书籍</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- 引入 Bootstrap -->
   <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
   <div class="row clearfix">
       <div class="col-md-12 column">
           <div class="page-header">
               <h1>
                   <small>新增书籍</small>
               </h1>
           </div>
       </div>
   </div>
   <form action="${pageContext.request.contextPath}/book/addBook" method="post">
      书籍名称：<input type="text" name="bookName"><br><br><br>
      书籍数量：<input type="text" name="bookCounts"><br><br><br>
      书籍详情：<input type="text" name="detail"><br><br><br>
       <input type="submit" value="添加">
   </form>
</div>

　　6.BookController 类编写 ， 方法三：修改书籍

@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
   Books books = bookService.queryBookById(id);
   System.out.println(books);
   model.addAttribute("book",books );
   return "updateBook";
}
@RequestMapping("/updateBook")
public String updateBook(Model model, Books book) {
   System.out.println(book);
   bookService.updateBook(book);
   Books books = bookService.queryBookById(book.getBookID());
   model.addAttribute("books", books);
   return "redirect:/book/allBook";
}

　　7.修改书籍页面 updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
   <title>修改信息</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- 引入 Bootstrap -->
   <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
   <div class="row clearfix">
       <div class="col-md-12 column">
           <div class="page-header">
               <h1>
                   <small>修改信息</small>
               </h1>
           </div>
       </div>
   </div>
   <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
       <input type="hidden" name="bookID" value="${book.getBookID()}"/>
      书籍名称：<input type="text" name="bookName" value="${book.getBookName()}"/>
      书籍数量：<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>
      书籍详情：<input type="text" name="detail" value="${book.getDetail() }"/>
       <input type="submit" value="提交"/>
   </form>
</div>

　　8.BookController 类编写 ， 方法四：删除书籍

@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
   bookService.deleteBookById(id);
   return "redirect:/book/allBook";
}

　　9.配置Tomcat，进行运行！