SSM框架整合

SSM分别对应：Spring + Spring MVC + Mybatis

Spring MVC负责实现MVC设计模式，Mybatis负责数据持久层，Spring负责管理SpringMVC和Mybatis相关对象的创建和依赖注入。

创建Maven工程，pom.xml

<dependencies>
  <!--  Spring MVC  -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.23</version>
  </dependency>

  <!--  Spring JDBC  -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.23</version>
  </dependency>

  <!--  Spring Aop  -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>5.3.23</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
    <version>5.3.23</version>
  </dependency>

  <!--  Mybatis  -->
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.6</version>
  </dependency>

  <!--  Mybatis整合Spring  -->
  <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.6</version>
  </dependency>

  <!--  Mysql连接  -->
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
  </dependency>

  <!--  C3P0  -->
  <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
  <dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.2</version>
  </dependency>

  <!--  JSTL  -->
  <!-- https://mvnrepository.com/artifact/jstl/jstl -->
  <dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
  </dependency>

  <!--  Servlet API  -->
  <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>1.18.24</version>
  </dependency>
</dependencies>

pom.xml还需在build标签中配置

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

web.xml中配置SpringMVC、Spring、字符编码过滤器、加载静态资源

<!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>

  <!-- 配置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>



  <!-- 配置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>

  <!-- 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>
  <!-- 配置字符编码过滤 -->
  <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>

</web-app>

在Spring.xml中配置Mybatis、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"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/aop
       http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
       http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- bean的id直接对应工厂拿bean的bean name -->
    <!--  配置Mybatis的数据源  -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="root"></property>
        <property name="password" value="2022753697"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/express?characterEncoding=utf8"></property>
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="initialPoolSize" value="5"></property>
        <property name="maxPoolSize" value="20"></property>
    </bean>

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

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

Mybatis-config.xml配置一些辅助信息，如日志、别名

<?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>

    <!--  打印Sql信息  -->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <!--  配置实体类别名  -->
    <typeAliases>
        <package name="cn.soutwind.Pojo"/>
    </typeAliases>

</configuration>

配置SpringMVC.xml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: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/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

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

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

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

实体类

package cn.soutwind.pojo;

import lombok.Data;

@Data
public class Product {
    private int id;
    private String goodsName;
    private double price;
}

Repository访问数据库

package cn.soutwind.repository;

import cn.soutwind.pojo.Product;

import java.util.List;

public interface ProductRepository {
    public List<Product> findAll();
}

对Repository的方法配置Map.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为映射的根节点-->
<!-- mapper为映射的根节点，namespace指定Dao接口的完整类名
mybatis会依据这个接口动态创建一个实现类去实现这个接口，
而这个实现类是一个Mapper对象-->
<mapper namespace="cn.soutwind.repository.ProductRepository">
    <!--id ="接口中的方法名"
　　parameterType="传入的参数类型"
　　resultType = "返回实体类对象，使用包.类名" -->
    <select id="findAll" resultType="Product">
        select *
        from product
   </select>
</mapper>

Serivce服务

package cn.soutwind.service;

import cn.soutwind.pojo.Product;

import java.util.List;

public interface ProductService {
    public List<Product> findAll();
}

实现Service接口

package cn.soutwind.service.Impl;

import cn.soutwind.pojo.Product;
import cn.soutwind.repository.ProductRepository;
import cn.soutwind.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class ProductServiceImpl implements ProductService {
    @Autowired
    private ProductRepository productRepository;

    @Override
    public List<Product> findAll() {
        return productRepository.findAll();
    }
}

Controller控制层

package cn.soutwind.controller;

import cn.soutwind.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/product")
public class ProductHandler {

    @Autowired
    private ProductService productService;

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


}