下面我们接着上一篇eureka的自我保护继续讲springcloud服务发现

controller层代码：

package com.atguigu.springcloud.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.atguigu.springcloud.entities.Dept;
import com.atguigu.springcloud.service.DeptService;

import javax.annotation.Resource;

@RestController
public class DeptController {

	@Autowired
	private DeptService service;

	//@Autowired
	@Resource
	private DiscoveryClient client;

	@RequestMapping(value = "/dept/add", method = RequestMethod.POST)
	public boolean add(@RequestBody Dept dept) {
		return service.add(dept);
	}

	@RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
	public Dept get(@PathVariable("id") Long id) {
		return service.get(id);
	}

	@RequestMapping(value = "/dept/list", method = RequestMethod.GET)
	public List<Dept> list() {
		return service.list();
	}

	
//	@Autowired
//	private DiscoveryClient client;
	@RequestMapping(value = "/dept/discovery", method = RequestMethod.GET)
	public Object discovery() {
		List<String> list = client.getServices();
		System.out.println("**********" + list);
		List<ServiceInstance> srvList = client.getInstances("MICROSERVICECLOUD-DEPT");
		for (ServiceInstance element : srvList) {
			System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
					+ element.getUri());
		}
		return this.client;
	}

}

注入服务发现
@Resource
private DiscoveryClient client;

service层代码

package com.atguigu.springcloud.service.impl;

import java.util.List;

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

import com.atguigu.springcloud.dao.DeptDao;
import com.atguigu.springcloud.entities.Dept;
import com.atguigu.springcloud.service.DeptService;

@Service
public class DeptServiceImpl implements DeptService {
	@Autowired
	private DeptDao deptDao;
	
	@Override
	public boolean add(Dept dept)
	{
		return deptDao.addDept(dept);
	}

	@Override
	public Dept get(Long id)
	{
		return deptDao.findById(id);
	}

	@Override
	public List<Dept> list()
	{
		return deptDao.findAll();
	}

}

dao层代码

@Mapper
//@Component
@Repository
public interface DeptDao {

	public boolean addDept(Dept dept);
	public Dept findById(Long id);
	public List<Dept> findAll();
}

代码结构：

mapper的核心配置文件mybatis.cfg.xml

<?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>

	<settings>
		<setting name="cacheEnabled" value="true" /><!-- 二级缓存开启 -->
	</settings>

</configuration>

mapper的sql映射文件DeptMapper.xml

<?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.atguigu.springcloud.dao.DeptDao">

	<select id="findById" resultType="Dept" parameterType="Long">
		select deptno,dname,db_source from dept where deptno=#{deptno};
	</select>
	<select id="findAll" resultType="Dept">
		select deptno,dname,db_source from dept;
	</select>
	<insert id="addDept" parameterType="Dept">
		INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());
	</insert>

</mapper>

启动类：

package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient //本服务启动后会自动注册进eureka服务中
@EnableDiscoveryClient //服务发现
public class DeptProvider8001_App {

	public static void main(String[] args) {

		SpringApplication.run(DeptProvider8001_App.class, args);
	}
}