Spring+SpringMVC+mybatis整合以及注解的使用(三)

1.包结构:

 2.spring配置:基本的DAO配置以及扫描Mapper(扫描出来的Mapper为首字母小写)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    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-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">


    <context:property-placeholder location="classpath:db.properties"/>
    
    <!-- 数据库连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="maxActive" value="10" />
        <property name="maxIdle" value="5" />
    </bean>
    
    <!-- Mybatis的工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 核心配置文件的位置 -->
        <property name="configLocation" value="classpath:sqlMapConfig.xml"/>
    </bean>

    <!-- Mapper动态代理开发   扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 基本包 -->
        <property name="basePackage" value="cn.qlq.springmvc.mapper"/>
    </bean>
    
    <!-- 注解事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <!-- 开启注解 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
    
</beans>

 3.mybatis配置（主要就一个定义别名）

<?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>
    <!-- 设置别名 -->
    <typeAliases>
        <!-- 2. 指定扫描包，会把包内所有的类都设置别名，别名的名称就是类名，大小写不敏感 -->
        <package name="cn.qlq.springmvc.pojo" />
    </typeAliases>

</configuration>

4.springMVC配置(主要就是配置扫描Service和Controller)

<?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: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-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

        
        
        <!-- 扫描@Controler  @Service   -->
        <context:component-scan base-package="cn.qlq"/>
        
        <!-- 处理器映射器 -->
<!--         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/> -->
        <!-- 处理器适配器 -->
<!--         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/> -->
        <!-- 注解驱动 -->
        <mvc:annotation-driven/>
        
     
        
        <!-- 视图解释器 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
        
   </beans>

5.Service使用注解注入Mapper(主要就是自己添加service注释与内部注入mapper)

   5.1 接口(接口中不做任何声明)

package cn.qlq.springmvc.service;
import java.util.List;

import cn.qlq.springmvc.pojo.Items;
public interface ItemService {
    public List<Items> findAllItems();
}

    5.2.Service实现类(自己添加service注释与内部注入mapper)

package cn.qlq.springmvc.service;

import java.util.List;

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

import cn.qlq.springmvc.mapper.ItemsMapper;
import cn.qlq.springmvc.pojo.Items;

@Service
public class ItemsServiceImpl implements ItemService {

    @Autowired
    private ItemsMapper itemsMapper;
    @Override
    public List<Items> findAllItems() {
        
        List<Items> selectByExampleWithBLOBs = itemsMapper.selectByExampleWithBLOBs(null);
        return selectByExampleWithBLOBs;
    }

}

6. 控制层(声明自己是Controller层与自动注入Service)

package cn.qlq.springmvc.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.HttpRequestHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import cn.qlq.springmvc.pojo.Items;
import cn.qlq.springmvc.service.ItemService;

/**
 * 商品管理
 * 
 * @author lx
 *
 */
@Controller
public class ItemController {
    @Autowired
    private ItemService itemService;
    //入门程序 第一   包类 + 类包 + 方法名
    @RequestMapping(value = "/item/itemlist.action")
    public ModelAndView itemList(){
        //从Mysql中查询
        List<Items> list = itemService.findAllItems();
        
        ModelAndView mav = new ModelAndView();
        //数据
        mav.addObject("itemList", list);
        mav.setViewName("itemList");
        return mav;
    }

    
}

总结:Service层注入时只用在实现类上声明service。注入时候注入接口名字。可以用自动装配@Autowired,也可以用

@Resource(name="baseDao")     
private BaseDao baseDao; 

这种格式注入对象，name就是扫描后的名字。