eclipse简单搭建springboot项目查询数据（之前一直都是idea开发）

1、File--->New--->Maven Project

2.

3.把下面代码放进pom.xml中

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
		</dependency>

		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.21</version>
		</dependency>

	</dependencies>

4.新建controller、service、serviceImpl、mapper几个包如下图

controller代码：

package com.ansheng.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.ansheng.service.TestService;

@RestController
public class TestController {
	@Autowired
	private TestService testService;
	@RequestMapping("/test")
	public int test() {
		int count=testService.queryCount();
		return count;
	}

}

service代码

package com.ansheng.service;

public interface TestService {

	int queryCount();

}

serviceImpl代码

package com.ansheng.service.impl;

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

import com.ansheng.mapper.TestMapper;
import com.ansheng.service.TestService;
@Service
public class TestServiceImpl implements TestService{
	@Autowired
   private TestMapper testMapper;
	@Override
	public int queryCount() {
		// TODO Auto-generated method stub
		return testMapper.queryCount();
	}

}

mapper代码

package com.ansheng.mapper;

import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface TestMapper {

	int queryCount();

}

5.在src/main/resources 下面新建一个mapper文件夹，新建一个xml文件，名字和mapper（dao）接口一致，如下图

代码如下：

<?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.ansheng.mapper.TestMapper">
	 <select id="queryCount" resultType="java.lang.Integer">
	   select count(0) from fdy
	 </select>
</mapper>

6.在src/main/resources 下面新建一个配置文件，名字为：application.properties

如下图：

在配置文件中配置数据库信息和mapper.xml扫描信息，代码如下：

spring.datasource.url=jdbc:mysql://localhost:3306/biye
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis.mapperLocations=classpath:mapper/*.xml

代码截图：

7.下面是启动类，启动类扫描同一包下面或者子包中的类，所以在src/main/java/com/ansheng 下面新建启动类App

代码：

package com.ansheng;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {

	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

然后运行就行了，亲测无误!