SpringCloud分布式微服务b2b2c电子商务docker-feign配置（六）

电玩女神 2021-05-20 20:36 446阅读 0赞

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，用于服务发现了解springcloud架构可以加求求：三五三六二四七二五九  
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：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTgyMTgxMg_size_16_color_FFFFFF_t_70]  
二、pom.xml文件

<?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">
        <parent>
            <artifactId>microservice-spring-cloud</artifactId>
            <groupId>com.jacky</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>microservice-consumer-movie-feign-customizing</artifactId>
        <packaging>jar</packaging>
    
        <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>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>com.spotify</groupId>
                    <artifactId>docker-maven-plugin</artifactId>
                    <executions>
                        
                        <execution>
                            <id>build-image</id>
                            <phase>install</phase>
                            <goals>
                                <goal>build</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        
                        <dockerHost>http://192.168.6.130:5678</dockerHost>
                        <pushImage>true</pushImage>
                        
                        <imageName>${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}</imageName>
                        
                        <baseImage>java:openjdk-8-jdk-alpine</baseImage>
                        
                        <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>
                        <resources>
                            <resource>
                                <targetPath>/</targetPath>
                                <directory>${project.build.directory}</directory>
                                <include>${project.build.finalName}.jar</include>
                            </resource>
                        </resources>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

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);
      }
    }

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