spring入门(六) spring mvc+mybatis

2018-10-06 08:06:37来源：博客园阅读 ()

1.引入依赖

 1 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
 2 <dependency>
 3     <groupId>org.mybatis</groupId>
 4     <artifactId>mybatis</artifactId>
 5     <version>3.4.5</version>
 6 </dependency>
 7 
 8 <!--spring的版本是5.0.9,mybatis-spring的版本要是1.3+ -->
 9 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
10 <dependency>
11     <groupId>org.mybatis</groupId>
12     <artifactId>mybatis-spring</artifactId>
13     <version>1.3.2</version>
14 </dependency>

2.在springmvc-config.xml增加mybatis配置

 1 <!-- 针对myBatis的配置项 -->
 2 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
 3     <!-- 实例化sqlSessionFactory时需要使用上述配置好的数据源以及SQL映射文件 -->
 4     <property name="dataSource" ref="dataSource" />
 5     <!-- 自动扫描classpath:mapper/*.xml         -->
 6     <property name="mapperLocations" value="classpath:mapper/*.xml" />
 7 </bean>
 8 <!-- 配置扫描器 -->
 9 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
10     <!-- 扫描com.ice.dao这个包以及它的子包下的所有映射接口类,省去了在每个mapper接口上注解 -->
11     <property name="basePackage" value="com.ice.dao" />
12     <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
13 </bean>

3.在classpath:mapper/ 创建CustomerMapper.xml

注意创建的位置,是在上面设置的 mapperLocations.

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 3 <!--  namespace要跟后面该xml对应的mapper类的全名一致 -->
 4 <mapper namespace="com.ice.dao.CustomerMapper">
 5     <!--  id设置为mapper类对应的方法名, parameterType跟方法的参数类型一致,resultType跟方法的返回类型一致.
 6     如果返回单个对象,mybatis会自动调用selectOne方法;如果返回的是List,mybatis会自动调用selectList方法.
 7     -->    
 8     <select id="getUser" parameterType="java.lang.String"
 9             resultType="com.ice.model.Customer">
10         select id,name from customer where name=#{name}
11     </select>
12 </mapper>

4.创建CustomerMapper.xml对应的CustomerMapper.java

注意创建的位置,是在上面设置的 basePackage.

1 package com.ice.dao;
2 
3 import com.ice.model.Customer;
4 //不用在xml里配置该bean,也不用注解.已经配置了MapperScanner 
5 //<property name="basePackage" value="com.ice.dao" />
6 public interface CustomerMapper {
7 
8     Customer getUser(String name);
9 }

5.简单测试(在controller里测试,也可考虑springTest)

正式项目里,要有service层.

 1 package com.ice.controller;
 2 
 3 import com.ice.dao.CustomerMapper;
 4 import com.ice.model.Customer;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.ResponseBody;
 9 
10 @Controller
11 @RequestMapping("/mybatis")
12 public class MybatisController {
13 
14     @Autowired
15     private CustomerMapper customerMapper;
16 
17     @RequestMapping("/query")
18     @ResponseBody
19     public String index() {
20         Customer user = customerMapper.getUser("hello");
21         return "顾客id" + user.getId();
22     }
23 }