最基础的SSM框架整合篇

一、简单理解

Spring、Spring MVC和MyBatis的整合主要原理就是将我们在单独使用Spring MVC和MyBatis过程中需要自己实例化的类都交由Ioc容器来管理，过程分为两步：

第一步整合Spring和Spring MVC，前提是项目已单独配置Spring和Spring MVC且能正常运行，主要步骤为先在项目中创建对应的service接口和它们的实现类，并通过注解实现类和在Spring配置文件中开启注解扫描的方式将接口实现类交由Ioc容器管理。接着在Controller响应请求的类中添加接口为成员变量，并且也通过注解的方式将其交由Ioc容器管理，最后，我们需要把Spring配置文件的加载设置为项目启动时，这里通过在web.xml文件中配置Spring监听器实现，至此就可以实现Spring和Spring MVC的整合。

第二整合Spring和MyBatis，前提也是项目已单独配置Spring和MyBatis且能正常运行，这里需要导入额外的jar包mybatis-spring.jar，这里的版本需要根据MyBatis版本来确认，且本项目通过c3p0来配置数据库连接池，也需要导入c3p0的jar包。主要步骤为先将MyBatis配置文件中的内容（配置连接池部分）转移到Spring配置文件中（原先的MyBatis配置文件也就可以删除了），并且在Spring配置文件中配置SqlSessionFactroy工厂和sql语句对应接口所在包，这也就是将工厂和接口都交由Ioc容器管理，至此就可以实现Spring和MyBatis的整合。

二、代码展示

1.配置文件

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>SSMProject</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>
    
    <!-- 配置Spring监听器，默认加载WEB-INF目录下的applicationContext.xml配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!-- 前端控制器 -->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置Spring MVC配置文件的位置和名称 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!-- 表示容器在启动时立即加载dispatcherServlet -->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- 让Spring MVC控制器拦截前端所有请求 -->
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <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>
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

applicationContext.xml（Spring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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!-- 开启注解扫描，非controller -->
    <context:component-scan base-package="com.yh">
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- Spring整合MyBatis -->
    <!-- 配置连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
        <!-- 驱动类名 -->
        <property name="jdbcUrl"
            value="jdbc:sqlserver://127.0.0.1:1433;databaseName=onlineshoppingmall" /><!-- 
            url访问地址 -->
        <property name="user" value="sa" /><!-- 链接数据库的用户名 -->
        <property name="password" value="12345yehuan" /><!-- 链接数据库的密码 -->
        <property name="initialPoolSize" value="10" />
        <property name="minPoolSize" value="5" />
        <property name="maxPoolSize" value="20" />
        <property name="maxIdleTime" value="0" />
    </bean>
    <!-- 配置SqlSessionFactroy工厂 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 配置接口所在包 -->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.yh.mybatis.mapper"></property>
    </bean>
    <!-- 配置Spring框架声明式事务管理 -->
    <!-- 配置事务管理器 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 配置事务通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" isolation="DEFAULT"/>
        </tx:attributes>
    </tx:advice>
    <!-- 配置AOP增强 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.yh.service.*.*(..))" id="txPoint"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
    </aop:config>
</beans>

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:aop="http://www.springframework.org/schema/aop"
    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-4.3.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.3.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">

    <!-- 开启注解扫描，只扫描controller注解 -->
    <context:component-scan base-package="com.yh.controller">
        <context:include-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 视图解析器对象 -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="" />
        <property name="suffix" value=".jsp" />
        <property name="order" value="1" />
    </bean>
    
    <!-- 解决访问html等其他资源404 -->
    <mvc:default-servlet-handler />
    
    <!-- 开启SpringMVC注解支持 -->
    <mvc:annotation-driven />

</beans>

2.service接口和它的实现类

AddressService.java

package com.yh.service;

import java.util.List;

import com.yh.entity.Address;

public interface AddressService {

    int addAddress(Address address);
    
    List<Address> loadAddress();

}

AddressServiceImpl.java

package com.yh.service.impl;

import java.util.List;

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

import com.yh.entity.Address;
import com.yh.mybatis.mapper.AddressMapper;
import com.yh.service.AddressService;

@Service("addressService")
public class AddressServiceImpl implements AddressService {
    
    @Autowired
    private AddressMapper am;

    @Override
    public int addAddress(Address address) {
        return am.addAddress(address);
    }

    @Override
    public List<Address> loadAddress() {
        System.out.println("业务层查找地址信息");
        return am.loadAddress();
    }

}

3.MyBatis的sql语句配置文件和接口

AddressMapper.xml

<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.yh.mybatis.mapper.AddressMapper">

    <select id="loadAddress" resultType="com.yh.entity.Address">
        select* from address
    </select>

    <insert id="addAddress" parameterType="com.yh.entity.Address">
        insert into address
        (buyerid,consignee)values(#{buyerId},#{consignee})
    </insert>

</mapper>

AddressMapper.java

package com.yh.mybatis.mapper;

import java.util.List;

import org.springframework.stereotype.Repository;

import com.yh.entity.Address;

@Repository
public interface AddressMapper {
    
    int addAddress(Address address);

    List<Address> loadAddress();
}

4.响应前端请求的Controller类

AddressController.java

package com.yh.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.yh.entity.Address;
import com.yh.service.AddressService;

@Controller
@RequestMapping(value = "/address")
public class AddressController {

    @Autowired
    private AddressService addressService;

    @ResponseBody
    @RequestMapping(value = "/loadAddress", produces = "application/json; charset=utf-8")
    public String loadAddress() {
        System.out.println("表现层查询所有地址");
        Address addr = new Address();
        addr.setBuyerId(99);
        addr.setConsignee("叶欢");
        int result = addressService.addAddress(addr);
        System.out.println(result != 0 ? "成功" : "失败");
        return null;
    }

}

5实体类

Address.java

package com.yh.entity;

import java.io.Serializable;

public class Address implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
private int buyerId;
    private String consignee;public int getBuyerId() {
        return buyerId;
    }

    public void setBuyerId(int buyerId) {
        this.buyerId = buyerId;
    }

    public String getConsignee() {
        return consignee;
    }

    public void setConsignee(String consignee) {
        this.consignee = consignee;
    }

    @Override
    public String toString() {
        return "Address [addressId=" + addressId + ", buyerId=" + buyerId + ", consignee=" + consignee + ", telephone="
                + telephone + ", detail=" + detail + ", defaultAddress=" + defaultAddress + "]";
    }
}