微服务Zuul网关实现服务降级

秒速五厘米 2023-07-02 08:27 26阅读 0赞

spring boot版本：2.1.10.RELEASE

#### 1、项目搭建 ####

所需依赖及项目的搭建请参考上一篇博客 [微服务中网关的作用及搭建][Link 1]

#### 2、添加fallback的bean ####

在spring boot 2.0之前实现的是 `ZuulFallbackProvider`接口，但是在spring boot 2.0之后实现的是 `FallbackProvider` 接口。

package com.ebook.zuul.fallback;
    
    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.nio.charset.Charset;
    
    /**
     * @author:JZ
     * @date:2020/1/28
     */
    
    @Component
    public class ProductFallbackProvider implements FallbackProvider {
    
        /**
         * 返回的是服务的路由，即服务的名称，
         * 代表为哪个服务提供fallback
         * @return
         */
        @Override
        public String getRoute() {
            return "ebook-product-core";
        }
    
        @Override
        public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
            return new ClientHttpResponse() {
    
                @Override
                public HttpHeaders getHeaders() {
                    HttpHeaders header = new HttpHeaders();
                    MediaType mt = new MediaType("application", "json", Charset.forName("UTF-8"));
                    header.setContentType(mt);
                    return header;
                }
    
                @Override
                public InputStream getBody() throws IOException {
                    String input="商品服务不可用，请联系管理员！";
                    return new ByteArrayInputStream(input.getBytes());
                }
    
                @Override
                public HttpStatus getStatusCode() throws IOException {
                    //HttpResponse的fallback的状态码,HttpStatus值
                    return HttpStatus.OK;
                }
    
                @Override
                public int getRawStatusCode() throws IOException {
                    //HttpResponse的fallback的状态码,int值
                    return this.getStatusCode().value();
                }
    
                @Override
                public String getStatusText() throws IOException {
                    //HttpResponse的fallback的状态码,string
                    return this.getStatusCode().getReasonPhrase();
                }
    
                @Override
                public void close() {
    
                }
            };
        }
    }

[Link 1]: https://blog.csdn.net/k_young1997/article/details/104091704