SSM

项目结构：

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 开启IOC扫描  -->
    <context:component-scan
            base-package="com.cn.service">
    </context:component-scan>
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass"
                  value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl"
                  value="jdbc:mysql://localhost:3306/test"/>
        <property name="user" value="root" />
        <property name="password" value="1234" />

    </bean>
    <!-- sqlSessionFactory -->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 关联连接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 加载sql映射文件 -->
        <property name="mapperLocations"
                  value="classpath:com/cn/dao/UserMapper.xml"></property>
    </bean>
    <!-- Mapper接口扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.cn.dao"></property>
    </bean>

    <!-- 开启Spring事务 -->
    <bean id="txManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 开启事务注解 -->
    <tx:annotation-driven
            transaction-manager="txManager" />
</beans>

springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc ">

    <!-- 扫描Controller -->
    <context:component-scan
            base-package="
	com.cn.controller ">
    </context:component-scan>
    <!-- 注解驱动 -->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!-- 视图解析器:简化在Controller类编写的视图路径 -->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

然后就是代码的编写，这里举一个简单的例子

controller

@Controller
@RequestMapping
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/login")
    public String golog() {
        return "login";
    }
    @RequestMapping("/goreg")
    public String goreg() {
        return "register";
    }
    @RequestMapping("/register")
    public String login(User user) {
        userService.saveUser(user);
        return "succ";
    }
    @RequestMapping("/login")
    public String register(String name,String pwd) {
        User user=userService.findUser(name, pwd);
        if(user!=null) {
            return "succ";
        }else {
            return "fail";
        }
    }
}

dao

UserMapper

这里要注意加注解，要不然spring将无法管理

@Repository
@Mapper
public interface UserMapper {
    void saveUser(User user);

    User findUser(@Param("name")String name,@Param("pwd")String pwd);
}

UserMapper.xml

这里要注意sql语句的优化，这里是没有优化的，就简单举例，查询语句应该指明查询的字段

<?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.cn.dao.UserMapper">
    <!-- saveUser()方法实现 -->
    <insert id="saveUser" parameterType="com.cn.entiy.User">
        insert into test (name,pwd) values (#{name},#{pwd})
    </insert>
    <!-- findUser()方法实现 -->
    <select id="findUser" resultType="com.cn.entiy.User">
        select  * from test where name=#{name} and pwd=#{pwd}
    </select>
</mapper>

entiy或者pojo层（省略）

service

UserService

public interface UserService {
    void saveUser(User user);
    User findUser(String name, String pwd);
}

UserServcieImpl

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapepr;
    @Override
    public void saveUser(User user) {
        // TODO Auto-generated method stub
        userMapepr.saveUser(user);
    }
    @Override
    public User findUser(String name, String pwd) {
        // TODO Auto-generated method stub
        return userMapepr.findUser(name, pwd);
    }
}

web.xml

org.springframework.web.servlet.DispatcherServlet需要去重点理解这个类

<?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:applicationContext.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
   <!-- &lt;!&ndash;    乱码过滤&ndash;&gt;
    <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-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

总结：在SSM框架中，我们除了配置文件要去理解透彻，它是怎么将业务等交于spring管理的，考虑框架的优缺点，比如：优点有将业务等交由spring管理；缺点：配置文件过于复杂，所以我们后来可以用springboot来解决这一问题
此项目只是一个大概流程，功能些还需要去完善，感谢！！！

浅谈SSM框架

原文：https://www.cnblogs.com/haotian6/p/14798652.html