Java B2B2C多用戶商城 springcloud架構-docker-feign配置(五)
阿新 • • 發佈：2019-01-18
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簡介
上一節我們討論了怎麽用feign聲明式調用cloud的生產者，這節我們討論一下feign配置，通過編寫配置類，我們可以自定義feign的日誌級別，日誌掃描目錄，可以通過feign調用服務在eureka上的調用信息
feign聲明接口之後，在代碼中通過@Resource或者@Autowired註入之後即可使用。
@FeignClient標簽的常用屬性如下：
- name：指定FeignClient的名稱，如果項目使用了Ribbon，name屬性會作為微服務的名稱，用於服務發現
- url: url一般用於調試，可以手動指定@FeignClient調用的地址
- decode404:當發生http 404錯誤時，如果該字段位true，會調用decoder進行解碼，否則拋出FeignException
- configuration: Feign配置類，可以自定義Feign的Encoder、Decoder、LogLevel、Contract
- fallback: 定義容錯的處理類，當調用遠程接口失敗或超時時，會調用對應接口的容錯邏輯，fallback指定的類必須實現@FeignClient標記的接口
- fallbackFactory: 工廠類，用於生成fallback類示例，通過這個屬性我們可以實現每個接口通用的容錯邏輯，減少重復的代碼
- path: 定義當前FeignClient的統一前綴
一、創建模塊（microservice-consumer-movie-feign-customizing）
項目結構如下：
二、pom.xml
<?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> <!--設置在執行maven 的install時構建鏡像--> <execution> <id>build-image</id> <phase>install</phase> <goals> <goal>build</goal> </goals> </execution> </executions> <configuration> <!--安裝了docker的主機，並且打開了api remote接口設置--> <dockerHost>http://192.168.6.130:5678</dockerHost> <pushImage>true</pushImage><!--設置上傳鏡像到私有倉庫，需要docker設置指定私有倉庫地址--> <!--鏡像名稱--> <imageName>${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}</imageName> <!--鏡像的基礎版本--> <baseImage>java:openjdk-8-jdk-alpine</baseImage> <!--鏡像啟動參數--> <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日誌配置 logging: level: com.jacky.cloud.feign.UserFeignClient: DEBUG # 解決第一次請求報超時異常的方案： # hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000 #延長超時時間 # 或者： # hystrix.command.default.execution.timeout.enabled: false # 或者： feign.hystrix.enabled: false # 索性禁用feign的hystrix支持 # 超時的issue：https://github.com/spring-cloud/spring-cloud-netflix/issues/768 # 超時的解決方案： 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、實體類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客戶端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客戶端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配置類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; //定義feign日誌顯示級別 } }
八、feign配置類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添加了安全驗證，則需要配置上面的用戶名、密碼 } }
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; /** * 調用生產者服務 * @param id * @return */ @GetMapping("/movie/{id}") public User findById(@PathVariable Long id) { return this.userFeignClient1.findById(id); } /** * 獲得服務在eureka信息 * @param serviceName * @return */ @GetMapping("/{serviceName}") public String findServiceInfoFromEurekaByServiceName(@PathVariable String serviceName) { return this.userfeignClient2.findServiceInfoFromEurekaByServiceName(serviceName); } }
十、啟動類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); } }
Spring Cloud大型企業分布式微服務雲構建的B2B2C電子商務平臺源碼請加企鵝求求：一零三八七七四六二六
Java B2B2C多用戶商城 springcloud架構-docker-feign配置(五)