feign starter 使用实例

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/FeignExampleApplication.java

@@ -0,0 +1,13 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.openfeign.EnableFeignClients;
+
+@EnableFeignClients
+@SpringBootApplication
+public class FeignExampleApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(FeignExampleApplication.class, args);
+	}
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/client/JSONPlaceHolderClient.java

@@ -0,0 +1,23 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.client;
+
+import java.util.List;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import com.chinaunicom.mall.ebtp.cloud.feign.example.config.ClientConfiguration;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.hystrix.JSONPlaceHolderFallback;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.model.Post;
+
+@FeignClient(value = "jplaceholder", url = "https://jsonplaceholder.typicode.com/", configuration = ClientConfiguration.class, fallback = JSONPlaceHolderFallback.class)
+public interface JSONPlaceHolderClient {
+
+	@RequestMapping(method = RequestMethod.GET, value = "/posts")
+	List<Post> getPosts();
+
+	@RequestMapping(method = RequestMethod.GET, value = "/posts/{postId}", produces = "application/json")
+	Post getPostById(@PathVariable("postId") Long postId);
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/config/ClientConfiguration.java

@@ -0,0 +1,22 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import feign.Logger;
+import feign.codec.ErrorDecoder;
+
+@Configuration
+public class ClientConfiguration {
+
+	@Bean
+	public Logger.Level feignLoggerLevel() {
+		return Logger.Level.FULL;
+	}
+
+	@Bean
+	public ErrorDecoder errorDecoder() {
+		return new CustomErrorDecoder();
+	}
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/config/CustomErrorDecoder.java

@@ -0,0 +1,23 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.config;
+
+import com.chinaunicom.mall.ebtp.cloud.feign.example.exception.BadRequestException;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.exception.NotFoundException;
+
+import feign.Response;
+import feign.codec.ErrorDecoder;
+
+public class CustomErrorDecoder implements ErrorDecoder {
+
+	@Override
+	public Exception decode(String methodKey, Response response) {
+		switch (response.status()) {
+		case 400:
+			return new BadRequestException();
+		case 404:
+			return new NotFoundException();
+		default:
+			return new Exception("Generic error");
+		}
+	}
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/exception/BadRequestException.java

@@ -0,0 +1,22 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.exception;
+
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+public class BadRequestException extends Exception {
+	private static final long serialVersionUID = 1L;
+
+	public BadRequestException(String message) {
+		super(message);
+	}
+
+	public BadRequestException(Throwable cause) {
+		super(cause);
+	}
+
+	@Override
+	public String toString() {
+		return "BadRequestException: " + getMessage();
+	}
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/exception/NotFoundException.java

@@ -0,0 +1,23 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.exception;
+
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+public class NotFoundException extends Exception {
+
+	private static final long serialVersionUID = 1L;
+
+	public NotFoundException(String message) {
+		super(message);
+	}
+
+	public NotFoundException(Throwable cause) {
+		super(cause);
+	}
+
+	@Override
+	public String toString() {
+		return "NotFoundException: " + getMessage();
+	}
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/hystrix/JSONPlaceHolderFallback.java

@@ -0,0 +1,24 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.hystrix;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.springframework.stereotype.Component;
+
+import com.chinaunicom.mall.ebtp.cloud.feign.example.client.JSONPlaceHolderClient;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.model.Post;
+
+@Component
+public class JSONPlaceHolderFallback implements JSONPlaceHolderClient {
+
+	@Override
+	public List<Post> getPosts() {
+		return Collections.emptyList();
+	}
+
+	@Override
+	public Post getPostById(Long postId) {
+		return null;
+	}
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/model/Post.java

@@ -0,0 +1,13 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.model;
+
+import lombok.Data;
+
+@Data
+public class Post {
+
+	private String userId;
+	private Long id;
+	private String title;
+	private String body;
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/service/JSONPlaceHolderService.java

@@ -0,0 +1,13 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.service;
+
+import java.util.List;
+
+import com.chinaunicom.mall.ebtp.cloud.feign.example.model.Post;
+
+public interface JSONPlaceHolderService {
+
+	List<Post> getPosts();
+
+	Post getPostById(Long id);
+
+}

examples/feign-example/src/main/java/com/chinaunicom/mall/ebtp/cloud/feign/example/service/impl/JSONPlaceHolderServiceImpl.java

@@ -0,0 +1,27 @@
+package com.chinaunicom.mall.ebtp.cloud.feign.example.service.impl;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.chinaunicom.mall.ebtp.cloud.feign.example.client.JSONPlaceHolderClient;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.model.Post;
+import com.chinaunicom.mall.ebtp.cloud.feign.example.service.JSONPlaceHolderService;
+
+@Service
+public class JSONPlaceHolderServiceImpl implements JSONPlaceHolderService {
+
+	private @Autowired JSONPlaceHolderClient jsonPlaceHolderClient;
+
+	@Override
+	public List<Post> getPosts() {
+		return jsonPlaceHolderClient.getPosts();
+	}
+
+	@Override
+	public Post getPostById(Long id) {
+		return jsonPlaceHolderClient.getPostById(id);
+	}
+
+}

examples/feign-example/src/main/resources/application-feign.yml

@@ -0,0 +1,6 @@
+server:
+  port: 8762
+  max-http-header-size: 1000000
+
+app:
+  id: mall-ebtp-cloud-demo

examples/feign-example/src/main/resources/application.yml

@@ -0,0 +1,10 @@
+spring:
+  profiles: 
+    active: feign
+  application:
+    name: mall-ebtp-cloud-demo
+
+logging:
+  level:
+    root: info
+