SpringCloud 服务熔断演示

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/gcxzflgl/article/details/82926413

本章基于前面的案例演示服务熔断

步骤一：新建maven module 端口8001，把之前创建的8001端口下的工程的文件放到新建的工程中。并且添加熔断依赖

<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>

步骤二：修改DeptController,如果访问的部门不存在，抛出的运行时异常被@HystrixCommand中定义的回调方法执行

package com.gcxzflgl.springcloud.controller;

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

import com.gcxzflgl.springCloud.entity.Dept;
import com.gcxzflgl.springcloud.service.DeptService;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;

@RestController
public class DeptController
{
	@Autowired
	private DeptService service = null;

	@RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
	//一旦调用服务方法失败并抛出了错误信息后，会自动调用@HystrixCommand标注好的fallbackMethod调用类中的指定方法
	@HystrixCommand(fallbackMethod = "processHystrix_Get")
	public Dept get(@PathVariable("id") Long id)
	{

		Dept dept = this.service.get(id);
		
		if (null == dept) {
			throw new RuntimeException("该ID：" + id + "没有没有对应的信息");
		}
		
		return dept;
	}

	public Dept processHystrix_Get(@PathVariable("id") Long id){
		Dept dept = new Dept();
		dept.setDeptno(id);
		dept.setDname("该ID：" + id + "没有没有对应的信息,null--@HystrixCommand");
		dept.setDb_source("no this database in MySQL");
		return dept;
	}
}

步骤三：启动主类，访问不存在的部门