SpringCloud-----Zuul的服务降级

1、pom.xml

			org.springframework.cloud
			spring-cloud-starter-zuul
		

2、实现ZuulFallbackProvider接口

package com.zemel.zuul.fallback;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.cloud.netflix.zuul.filters.route.ZuulFallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

@Component
public class DeptProviderFallback implements ZuulFallbackProvider {

	@Override
	public ClientHttpResponse fallbackResponse() {
		
		return new ClientHttpResponse() {
			
			@Override
			public HttpHeaders getHeaders() {
				HttpHeaders headers = new HttpHeaders();
				headers.set("Content-Type", "text/html;charset=UTF-8");
				
				return headers;
			}
			
			@Override
			public InputStream getBody() throws IOException {
				// 当出现服务调用错误之后返回的内容
				// 服务端死掉，会自动找zuul的失败回退服务降级
				return new ByteArrayInputStream("\"deptno\":7777,\"dname\":\"【error】Zuul-Fallback\",\"loc\":\"Gateway\"".getBytes());
			}
			
			@Override
			public String getStatusText() throws IOException {
				
				return HttpStatus.BAD_REQUEST.getReasonPhrase();
			}
			
			@Override
			public HttpStatus getStatusCode() throws IOException {
				
				return HttpStatus.BAD_REQUEST;
			}
			
			@Override
			public int getRawStatusCode() throws IOException {
				
				return HttpStatus.BAD_REQUEST.value();
			}
			
			@Override
			public void close() {
				// TODO Auto-generated method stub
				
			}
		};
	}

	@Override
	public String getRoute() {
		
		// 设置好处理失败的路由
		return "dept-8001";
	}

}

 

3、关闭服务端，访问zuul代理地址