springCloud4---feign

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;

@RestController

public 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: 7905

eureka:

  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

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservice-consumer-movie-feign</artifactId>

    <packaging>jar</packaging>

    <parent>

        <groupId>com.itmuch.cloud</groupId>

        <artifactId>microservice-spring-cloud</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- 引入feign依赖 -->

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-feign</artifactId>

        </dependency>

    </dependencies>

</project>

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;

@RestController

public 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;

@Configuration

public 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;

@Configuration

public class Configuration2 {

  @Bean

  public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {

    return new BasicAuthRequestInterceptor("user", "password123");

  }

}

spring:

  application:

    name: microservice-consumer-movie

server:

  port: 7901

eureka:

  client:

    healthcheck:

      enabled: true

    serviceUrl:

      defaultZone: http://user:password123@localhost:8761/eureka

  instance:

    prefer-ip-address: true

logging:

  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

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservice-consumer-movie-feign-customizing</artifactId>

    <packaging>jar</packaging>

    <parent>

        <groupId>com.itmuch.cloud</groupId>

        <artifactId>microservice-spring-cloud</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-feign</artifactId>

        </dependency>

    </dependencies>

</project>

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