SpringCloud-使用路由网关统一访问接口示例代码.zip

package com.badao.hello.spring.cloud.zuul.fallback; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.client.ClientHttpResponse; import org.springframework.stereotype.Component; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; @Component public class WebAdminFeignFallbackProvider implements FallbackProvider { @Override public String getRoute() { // ServiceId，如果需要所有调用都支持回退，则 return "*" 或 return null return "hello-spring-cloud-web-admin-feign"; } /** * 如果请求服务失败，则返回指定的信息给调用者 * @param route * @param cause * @return */ @Override public ClientHttpResponse fallbackResponse(String route, Throwable cause) { return new ClientHttpResponse() { /** * 网关向 api 服务请求失败了，但是消费者客户端向网关发起的请求是成功的， * 不应该把 api 的 404,500 等问题抛给客户端 * 网关和 api 服务集群对于客户端来说是黑盒 * @return * @throws IOException */ @Override public HttpStatus getStatusCode() throws IOException { return HttpStatus.OK; } @Override public int getRawStatusCode() throws IOException { return HttpStatus.OK.value(); } @Override public String getStatusText() throws IOException { return HttpStatus.OK.getReasonPhrase(); } @Override public void close() { } @Override public InputStream getBody() throws IOException { ObjectMapper objectMapper = new ObjectMapper(); Map<String, Object> map = new HashMap<>(); map.put("status", 200); map.put("message", "无法连接，请检查您的网络"); return new ByteArrayInputStream(objectMapper.writeValueAsString(map).getBytes("UTF-8")); } @Override public HttpHeaders getHeaders() { HttpHeaders headers = new HttpHeaders(); // 和 getBody 中的内容编码一致 headers.setContentType(MediaType.APPLICATION_JSON_UTF8); return headers; } }; } }