springCloud4---feign-白红宇

springCloud4---feign

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发布时间：2019-06-06

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JAX-WS : soap是遵循这个标准。

JAX-RS ：标准，jersey框架遵循这个标准。

Feign是一个声明式的web service客户端。Feign使用的负载均衡也是ribbon，Feign整合了Ribbon和Eureka。

package com.itmuch.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.feign.EnableFeignClients;@SpringBootApplication@EnableEurekaClient@EnableFeignClients  //Feign的客户端public class ConsumerMovieFeignApplication {  public static void main(String[] args) {    SpringApplication.run(ConsumerMovieFeignApplication.class, args);  }}

package com.itmuch.cloud.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import com.itmuch.cloud.entity.User;import com.itmuch.cloud.feign.UserFeignClient;@RestControllerpublic class MovieController {  @Autowired  private UserFeignClient userFeignClient;/*  原来是通过restTemplate来调用  @GetMapping("/movie/{id}")  public User findById(@PathVariable Long id) {        return this.restTemplate.getForObject(this.userServicePath + id, User.class);  }*/    @GetMapping("/movie/{id}")  public User findById(@PathVariable Long id) {    return this.userFeignClient.findById(id);  }  @GetMapping("/test")  public User testPost(User user) {    return this.userFeignClient.postUser(user);  }  @GetMapping("/test-get")  public User testGet(User user) {    return this.userFeignClient.getUser(user);  }}

package com.itmuch.cloud.feign;import org.springframework.cloud.netflix.feign.FeignClient;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.itmuch.cloud.entity.User;@FeignClient("microservice-provider-user")  //请求microservice-provider-user服务public interface UserFeignClient {  @RequestMapping(value = "/simple/{id}", method = RequestMethod.GET)//microservice-provider-user服务的/simple/{id}  public User findById(@PathVariable("id") Long id); // 两个坑：1. @GetMapping不支持   2. @PathVariable得设置value  @RequestMapping(value = "/user", method = RequestMethod.POST) //post对象  public User postUser(@RequestBody User user);  // 该请求不会成功，只要参数是复杂对象，即使指定了是GET方法，feign依然会以POST方法进行发送请求。可能是我没找到相应的注解或使用方法错误。  // 如勘误，请@lilizhou2008  eacdy0000@126.com  @RequestMapping(value = "/get-user", method = RequestMethod.GET)  public User getUser(User user);}

spring:  application:    name: microservice-consumer-movie  #本服务的名字server:  port: 7905eureka:  client:    healthcheck:      enabled: true    serviceUrl:      defaultZone: http://user:password123@localhost:8761/eureka  #注册到的eureka的地址  instance:    prefer-ip-address: true


     
         
      
       4.0.0
          
      
       microservice-consumer-movie-feign
          
      
       jar
          
              
       
        com.itmuch.cloud
               
       
        microservice-spring-cloud
               
       
        0.0.1-SNAPSHOT
           
          
              
       
        UTF-8
               
       
        UTF-8
               
       
        1.8
           
          
              
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-web
                
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-eureka
                
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-actuator
                
               
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-feign

复写feign的默认配置，

package com.itmuch.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.feign.EnableFeignClients;@SpringBootApplication@EnableEurekaClient@EnableFeignClients//默认只扫描这个类所在的包和子包public class ConsumerMovieFeignApplication {  public static void main(String[] args) {    SpringApplication.run(ConsumerMovieFeignApplication.class, args);  }}

package com.itmuch.cloud.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import com.itmuch.cloud.entity.User;import com.itmuch.cloud.feign.FeignClient2;import com.itmuch.cloud.feign.UserFeignClient;@RestControllerpublic class MovieController {  @Autowired  private UserFeignClient userFeignClient;  @Autowired  private FeignClient2 feignClient2;  @GetMapping("/movie/{id}")  public User findById(@PathVariable Long id) {    return this.userFeignClient.findById(id);  }  @GetMapping("/{serviceName}")  public String findServiceInfoFromEurekaByServiceName(@PathVariable String serviceName) {    return this.feignClient2.findServiceInfoFromEurekaByServiceName(serviceName);  }}

package com.itmuch.cloud.feign;import org.springframework.cloud.netflix.feign.FeignClient;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import com.itmuch.config.Configuration2;//Configuration2作为他的配置文件@FeignClient(name = "xxxx", url = "http://localhost:8761/", configuration = Configuration2.class)public interface FeignClient2 {  @RequestMapping(value = "/eureka/apps/{serviceName}")  public String findServiceInfoFromEurekaByServiceName(@PathVariable("serviceName") String serviceName);}

package com.itmuch.cloud.feign;import org.springframework.cloud.netflix.feign.FeignClient;import com.itmuch.cloud.entity.User;import com.itmuch.config.Configuration1;import feign.Param;import feign.RequestLine;//Configuration1作为他的配置文件@FeignClient(name = "microservice-provider-user", configuration = Configuration1.class)public interface UserFeignClient {  @RequestLine("GET /simple/{id}")  public User findById(@Param("id") Long id);}

package com.itmuch.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import feign.Contract;import feign.Logger;@Configurationpublic class Configuration1 {  @Bean  public Contract feignContract() {    return new feign.Contract.Default();  }  @Bean  Logger.Level feignLoggerLevel() {    return Logger.Level.FULL;  }}

package com.itmuch.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import feign.auth.BasicAuthRequestInterceptor;@Configurationpublic class Configuration2 {  @Bean  public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {    return new BasicAuthRequestInterceptor("user", "password123");  }}

spring:  application:    name: microservice-consumer-movieserver:  port: 7901eureka:  client:    healthcheck:      enabled: true    serviceUrl:      defaultZone: http://user:password123@localhost:8761/eureka  instance:    prefer-ip-address: truelogging:  level:    com.itmuch.cloud.feign.UserFeignClient: DEBUG   #日志是debug级别# 解决第一次请求报超时异常的方案：# hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000# 或者：# hystrix.command.default.execution.timeout.enabled: false# 或者：feign.hystrix.enabled: false ## 索性禁用feign的hystrix# 超时的issue：https://github.com/spring-cloud/spring-cloud-netflix/issues/768# 超时的解决方案： http://stackoverflow.com/questions/27375557/hystrix-command-fails-with-timed-out-and-no-fallback-available# hystrix配置： https://github.com/Netflix/Hystrix/wiki/Configuration#execution.isolation.thread.timeoutInMilliseconds


     
         
      
       4.0.0
          
      
       microservice-consumer-movie-feign-customizing
          
      
       jar
          
              
       
        com.itmuch.cloud
               
       
        microservice-spring-cloud
               
       
        0.0.1-SNAPSHOT
           
          
              
       
        UTF-8
               
       
        UTF-8
               
       
        1.8
           
          
              
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-web
                
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-eureka
                
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-actuator
                
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-feign