spring boot最新教程(三_2):整合mybatis方式二

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/wx5040257/article/details/85931252

前面我们提到了使用mybatis官方提供的Spring Boot整合包可以实现mybatis的整合，

              地址：https://github.com/mybatis/spring-boot-starter

对pom依赖配置如下

<!-- 整合mybatis需要  mybatis相关的jar会自动下载 -->
		<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.1</version>
        </dependency>

完整的pom文件配置如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.wx</groupId>
  <artifactId>bootmybatis02</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.5.RELEASE</version>
	</parent>
	
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- jdbcTemplate 以及事务支持-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<!-- 整合mybatis  mybatis相关的jar会自动下载 -->
		<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.1</version>
        </dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<!-- 阿里巴巴druid连接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.9</version>
		</dependency>
	</dependencies>
  <build>
		<finalName>${project.artifactId}</finalName>
		<plugins>
			<!-- java编译插件 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

接下来看整合mybatis的配置,在application.properties文件中配置

#整合mybatis关键配置
mybatis.mapper-locations=classpath:mappers/*Mapper.xml
mybatis.config-location=classpath:mybatis-config.xml

项目目录如下所示

接下来看关键代码

dao层=====>

package com.wx.dao;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.wx.entitys.UserEntity;

@Component("userDao")
public class UserDaoImpl implements IUserDao {
	@Autowired
	private SqlSessionTemplate sqlTemplate;
	
	public List<UserEntity> queryUserList(){
        List<UserEntity> userList = sqlTemplate.selectList("user.queryAll");
        return userList;
    }
}

SqlSessionTemplate会自动注入,那这就奇怪了,怎么注入的呢,我们来看源代码

我们找到mybatis-spring-boot-autoconfigure-1.2.1.jar

观察画横线处

其实就是对传统的整合方式进行了自动配置

控制层代码如下

package com.wx.controlers;

import java.util.List;

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.wx.biz.UserBiz;
import com.wx.entitys.UserEntity;

@Controller
public class UserControler {
	
	@Autowired
	private UserBiz userBiz;
	
	@RequestMapping("/Users.php")
	@ResponseBody
	public List<UserEntity> queryUserList(){
		return userBiz.queryUserList();
	}
}

启动类代码如下:

package com.wx.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@SpringBootApplication
/* 如果没有配置ComponentScan,默认扫描当前包及其子包,如果配置了,就要把当前包也纳入扫描*/
@ComponentScan(basePackages="com.wx.boot,com.wx.dao,com.wx.biz,com.wx.controlers")
public class BootMybatisApp {
	
	public static void main(String[] args) {
		SpringApplication.run(BootMybatisApp.class, args);
	}
}