简易的SSM框架整合小案例

简易的SSM框架整合小案例

一、创建一个web工程的maven项目

1、项目名随便起

2、选择好你的maven路径，然后finish

二、配置pom.xml文件

<!--    SpringMVC-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>

<!--    Spring JDBC-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>

<!--    Spring AOP-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>

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

<!--    MyBatis整合Spring-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.5</version>
    </dependency>

<!--    MySql驱动-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.20</version>
    </dependency>

<!--    C3P0-->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.5.5</version>
    </dependency>

<!-- JSTL -->
      <dependency>
          <groupId>jstl</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
      </dependency>

<!--    ServletAPI-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>

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

再在下面添加上加载资源配置

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

三、创建java和resource文件夹，并将它们标记

1、未标记的可以手动右键文件夹标记，如上图文件夹的颜色（新版的idea会自动标记）

2、在resources文件夹下先创建一个空的springmvc.xml和spring.xml配置文件放着先

四、配置web.xml文件

直接全复制粘贴就好

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!-- 启动Spring -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- Spring MVC -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 字符编码过滤器 -->
  <filter>
    <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- 加载静态资源 -->
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.css</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.jpg</url-pattern>
  </servlet-mapping>
</web-app>

五、创建数据库

为方便部分老铁，sql语句就奉上了

CREATE DATABASE `ssm`;

USE `ssm`;

DROP TABLE IF EXISTS `t_user`;

CREATE TABLE `t_user` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) DEFAULT NULL,
  `password` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

insert  into `t_user`(`id`,`username`,`password`) values (1,'ximen','12345'),(2,'admin','admin'),(3,'giao','123'),(4,'root','root');

六、创建entity和repository文件夹并创建实体类和mapper文件

1、创建实体类

注：第一次使用Lombok的要先去IDEA插件中心去下载Lombok插件

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

@Data//生成get和set方法
@NoArgsConstructor//生成无参构造
@AllArgsConstructor//生成有参构造
public class User {
    private int id;
    private String username;
    private String password;
}

2、创建一个空的mapper.xml文件先放着

3、再在resource文件夹下创建一个名为config.xml的mybatis配置文件

先创建一个空的就好

七、在 spring.xml 中配置 MyBatis 和 Spring 的整合

<?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-3.2.xsd
">

    <!-- 整合MyBatis -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="root"/>
        <property name="password" value="root"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm?useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"/>
        <property name="initialPoolSize" value="5"/>
        <property name="maxPoolSize" value="10"/>
    </bean>

    <!-- 配置MyBatis SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/ximen/repository/*.xml"/>
        <property name="configLocation" value="classpath:config.xml"/>
    </bean>

    <!-- 扫描自定义的Mapper接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ximen.repository"/>
    </bean>

</beans>

八、在config.xml 配置一些 MyBatis 辅助信息，比如打印 SQL 等

<?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>
    <settings>
        <!-- 打印SQL-->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>

    <typeAliases>
        <!-- 指定一个包名，MyBatis会在包名下搜索需要的JavaBean-->
        <package name="com.ximen.entity"/>
    </typeAliases>

</configuration>

九、配置springmv.xml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"
       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-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <!-- 启动注解驱动 -->
    <mvc:annotation-driven/>

    <!-- 扫描业务代码 -->
    <context:component-scan base-package="com.ximen"/>

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

</beans>

十、创建repository接口和配置mapper文件

1、创建repository定义一个查找方法

import java.util.List;

public interface UserRepository {
    public List<User> findAll();
}

2、配置mapper.xml文件

<?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="com.ximen.repository.UserRepository">
    <select id="findAll" resultType="User">
        select * from t_user
    </select>
</mapper>

十一、创建service层

1、创建service接口并实现一个查找方法

import java.util.List;

public interface UserService {
    public List<User> findAll();
}

2、创建service接口实现类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class UserServiceImpl implements UserService{
    @Autowired
    private UserRepository userRepository;

    @Override
    public List<User> findAll() {
        return userRepository.findAll();
    }
}

十二、创建controller控制层

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/user")
public class UserHandler {
    @Autowired
    private UserService userService;

    @GetMapping("/findAll")
    public ModelAndView findAll(){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("index");
        modelAndView.addObject("list",userService.findAll());
        return modelAndView;
    }
}

十三、写index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <c:forEach items="${list}" var="user">
        ${user.id}--${user.username}--${user.password}
    </c:forEach>
</body>
</html>

十四、配置Tomcat，启动

然后就整合成功了，其他CRUD的功能应该都会了吧