SSM（使用配置文件）

SSM框架集成的搭建

在此博主为大家记录配置Spring，Spring MVC,以及Mybaties三个框架的流程
总共需要分以下几步

引入所需Jar包

博主的文件结构是

编写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>SprigspringMybaties1</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
  <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:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
<!-- 现在配置spring的servlet映射 -->
  <servlet-mapping>
     <servlet-name>SpringMVC</servlet-name>
     <url-pattern>*.do</url-pattern>
  </servlet-mapping>
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>
  <listener>
       <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
  <param-name>contextConfigLocation</param-name>
  <!--这个路径代表src路径下的applicationContext.xml-->
       <param-value>WEB-INF/classes/applicationContext.xml</param-value>
  </context-param>
</web-app>

编写实体类User以及UserMapper.xml

实体类User：

public class User {
    private int id;
    private String username;
    private String password;
    private String money;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getMoney() {
        return money;
    }

    public void setMoney(String money) {
        this.money = money;
    }

}

映射文件UserMapper.xml：

<?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.dao.BaseDao">
    <select id="queryUserByid" parameterType="int" resultType="com.bean.User">
       SELECT * FROM User WHERE ID = #{id}
    </select>
    <resultMap id="userlist" type="com.bean.User">
       <result  property="id" column="id"/>
       <result  property="username" column="username"/>
       <result  property="password" column="password"/>
       <result  property="money"    column="money"/>
    </resultMap>
    <select id="selectAll" parameterType="int" resultMap="userlist">
       SELECT * FROM User
    </select>
</mapper>

编写BaseDAO接口

BaseDao接口：
这里要注明@MapperScan否则Spring容器扫描注入会失败，且方法名要跟UserMapper.xml映射文件里面的查询id名一样，即可不用编写实现类，会自动调用查询语句

@MapperScan
public interface BaseDao {
    List<User> selectAll();
}

编写UserAction

UserAction（Controller）：.

@Controller
public class UserAction{
    @Resource(name = "baseDao")
    private BaseDao baseDao;
    @RequestMapping(name="/selectall")
    public String selectAll() {
       List<User> list= baseDao.selectAll();
       for (User user : list) {
        System.out.println(user.getUsername());
    }
        return "list";
    }
    public BaseDao getBaseDao() {
        return baseDao;
    }
    public void setBaseDao(BaseDao baseDao) {
        this.baseDao = baseDao;
    }
}

编写db.properties

c.driver=com.mysql.jdbc.Driver
c.url=jdbc:mysql:///springc3p0
c.user=root
c.password=root

编写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" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
    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-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    <context:annotation-config></context:annotation-config>
    <context:component-scan base-package="com.*"></context:component-scan>
    <context:property-placeholder location="classpath:db.properties" />
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${c.driver}"></property>
        <property name="jdbcUrl" value="${c.url}"></property>
        <property name="user" value="${c.user}"></property>
        <property name="password" value="${c.password}"></property>
    </bean>
    <bean id="sqlsessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="dataSource"></property>
         <property name="mapperLocations" value="classpath:com/bean/*Mapper"></property>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage" value="com.bean"></property>
         <property name="sqlSessionFactoryBeanName" value="sqlsessionFactory"></property>
    </bean>
</beans>

编写springmvc.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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        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-4.3.xsd">
    <context:component-scan base-package="com.action"></context:component-scan>
    <mvc:annotation-driven></mvc:annotation-driven>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!--设置前缀和后缀-->
       <property name="prefix" value=""></property>
       <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

到此全部编写完成，其中难理解的地方就是为什么方法名和映射文件中id名相同即可调用，在此博主了解的也不是很清晰，随着学习，博主一定会回来透彻的讲解为什么能映射过去