java版spring cloud+spring boot+redis社交电子商务平台-docker-feign配置(五)

简介

B2B2C电子商务平台源码请加企鹅求求：一零三八七七四六二六。上一节我们讨论了怎么用feign声明式调用cloud的生产者，这节我们讨论一下feign配置，通过编写配置类，我们可以自定义feign的日志级别，日志扫描目录，可以通过feign调用服务在eureka上的调用信息。

feign声明接口之后，在代码中通过@Resource或者@Autowired注入之后即可使用。

@FeignClient标签的常用属性如下：

• name：指定FeignClient的名称，如果项目使用了Ribbon，name属性会作为微服务的名称，用于服务发现
• url: url一般用于调试，可以手动指定@FeignClient调用的地址
• decode404:当发生http 404错误时，如果该字段位true，会调用decoder进行解码，否则抛出FeignException
• configuration: Feign配置类，可以自定义Feign的Encoder、Decoder、LogLevel、Contract
• fallback: 定义容错的处理类，当调用远程接口失败或超时时，会调用对应接口的容错逻辑，fallback指定的类必须实现@FeignClient标记的接口
• fallbackFactory: 工厂类，用于生成fallback类示例，通过这个属性我们可以实现每个接口通用的容错逻辑，减少重复的代码
• path: 定义当前FeignClient的统一前缀

一、创建模块（microservice-consumer-movie-feign-customizing）

项目结构如下：

image

二、pom.xml

    
        microservice-spring-cloud
        com.jacky
        1.0-SNAPSHOT
    
    4.0.0

    microservice-consumer-movie-feign-customizing
    jar

    
        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
        
    

    
        
            
                com.spotify
                docker-maven-plugin
                
                    
                    
                        build-image
                        install
                        
                            build
                        
                    
                
                
                    
                    http://192.168.6.130:5678
                    true
                    
                    ${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}
                    
                    java:openjdk-8-jdk-alpine
                    
                    ["java", "-jar", "/${project.build.finalName}.jar"]
                    
                        
                            /
                            ${project.build.directory}
                            ${project.build.finalName}.jar
                        
                    
                
            
        
    

三、配置文件

spring:
  application:
    name: microservice-consumer-movie-feign-customizing
server:
  port: 7901
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://jacky:admin@peer1:8761/eureka/,http://jacky:admin@peer2:8762/eureka/,http://jacky:admin@peer3:8763/eureka/
  instance:
    prefer-ip-address: true
#feign日志配置
logging:
  level:
    com.jacky.cloud.feign.UserFeignClient: DEBUG

# 解决第一次请求报超时异常的方案：
# hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000  #延长超时时间
# 或者：
# hystrix.command.default.execution.timeout.enabled: false
# 或者：
feign.hystrix.enabled: false                       # 索性禁用feign的hystrix支持

# 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

四、实体类User.java

package com.jacky.cloud.entity;

import java.math.BigDecimal;

public class User {
  private Long id;

  private String username;

  private String name;

  private Short age;

  private BigDecimal balance;

  public Long getId() {
    return this.id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return this.username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Short getAge() {
    return this.age;
  }

  public void setAge(Short age) {
    this.age = age;
  }

  public BigDecimal getBalance() {
    return this.balance;
  }

  public void setBalance(BigDecimal balance) {
    this.balance = balance;
  }

}

五、feign客户端1（UserFeignClient1.java）

package com.jacky.cloud.feign;

import org.springframework.cloud.netflix.feign.FeignClient;

import com.jacky.cloud.entity.User;
import com.jacky.config.Configuration1;

import feign.Param;
import feign.RequestLine;

@FeignClient(name = "microservice-provider-user", configuration = Configuration1.class)
public interface UserFeignClient1 {
  @RequestLine("GET /simple/{id}")
  public User findById(@Param("id") Long id);
}

六、feign客户端2（UserFeignClient2.java）

package com.jacky.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.jacky.config.Configuration2;

@FeignClient(name = "xxxx", url = "http://localhost:8761/", configuration = Configuration2.class)
public interface UserFeignClient2 {
  @RequestMapping(value = "/eureka/apps/{serviceName}")
  public String findServiceInfoFromEurekaByServiceName(@PathVariable("serviceName") String serviceName);
}

七、feign配置类1（Configuration1.java）

package com.jacky.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;  //定义feign日志显示级别
  }
}

八、feign配置类2（Configuration2.java）

package com.jacky.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("jacky", "admin"); //Eureka添加了安全验证，则需要配置上面的用户名、密码
  }
}

九、MovieController.java

package com.jacky.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.jacky.cloud.entity.User;
import com.jacky.cloud.feign.UserFeignClient2;
import com.jacky.cloud.feign.UserFeignClient1;

@RestController
public class MovieController {

  @Autowired
  private UserFeignClient1 userFeignClient1;

  @Autowired
  private UserFeignClient2 userfeignClient2;

  /**
   * 调用生产者服务
   * @param id
   * @return
     */
  @GetMapping("/movie/{id}")
  public User findById(@PathVariable Long id) {
    return this.userFeignClient1.findById(id);
  }

  /**
   * 获得服务在eureka信息
   * @param serviceName
   * @return
     */
  @GetMapping("/{serviceName}")
  public String findServiceInfoFromEurekaByServiceName(@PathVariable String serviceName) {
    return this.userfeignClient2.findServiceInfoFromEurekaByServiceName(serviceName);
  }
}

十、启动类ConsumerMovieFeignApplication.java

package com.jacky.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
public class ConsumerMovieFeignApplication {
  public static void main(String[] args) {
    SpringApplication.run(ConsumerMovieFeignApplication.class, args);
  }
}

需要JAVASpring Cloud大型企业分布式微服务云构建的B2B2C电子商务平台源码请加企鹅求求：一零三八七七四六二六