SpringCloud(第 013 篇)電影微服務(wù)使用定制化 Feign 在客戶端進(jìn)行負(fù)載均衡調(diào)度并為 Feign 配置帳號(hào)密碼登錄認(rèn)證 Eureka
一擅耽、大致介紹
1岩遗、定制 Feign 實(shí)現(xiàn)訪問(wèn)遠(yuǎn)端微服務(wù)告私;
2馁龟、為 Feign 配置帳號(hào)密碼來(lái)登錄認(rèn)證 Eureka 服務(wù)發(fā)現(xiàn)模塊蹋盆;
3、修改 Feign 的日志打印級(jí)別后德;
4部宿、定制 Feign 也毫不掩飾的支持負(fù)載均衡調(diào)度功能;
二瓢湃、實(shí)現(xiàn)步驟
2.1 添加 maven 引用包
<?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>springms-consumer-movie-feign-custom</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.springms.cloud</groupId>
<artifactId>springms-spring-cloud</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- web模塊 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 客戶端發(fā)現(xiàn)模塊 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!-- Java HTTP 客戶端開(kāi)發(fā)的工具的模塊 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
</dependencies>
</project>
2.2 添加應(yīng)用配置文件(springms-consumer-movie-feign-custom\src\main\resources\application.yml)
spring:
application:
name: springms-consumer-movie-feign-custom
server:
port: 8050
eureka:
client:
# healthcheck:
# enabled: true
serviceUrl:
defaultZone: http://admin:admin@localhost:8761/eureka
instance:
prefer-ip-address: true
instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}
logging:
level:
com.springms.cloud.feign.UserFeignCustomClient: DEBUG
# 解決第一次請(qǐng)求報(bào)超時(shí)異常的方案理张,因?yàn)?hystrix 的默認(rèn)超時(shí)時(shí)間是 1 秒,因此請(qǐng)求超過(guò)該時(shí)間后绵患,就會(huì)出現(xiàn)頁(yè)面超時(shí)顯示 :
#
# 這里就介紹大概三種方式來(lái)解決超時(shí)的問(wèn)題雾叭,解決方案如下:
#
# 第一種方式:將 hystrix 的超時(shí)時(shí)間設(shè)置成 5000 毫秒
# hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000
#
# 或者:
# 第二種方式:將 hystrix 的超時(shí)時(shí)間直接禁用掉,這樣就沒(méi)有超時(shí)的一說(shuō)了落蝙,因?yàn)橛肋h(yuǎn)也不會(huì)超時(shí)了
# hystrix.command.default.execution.timeout.enabled: false
#
# 或者:
# 第三種方式:索性禁用feign的hystrix支持
feign.hystrix.enabled: false ## 索性禁用feign的hystrix支持
# 超時(shí)的issue:https://github.com/spring-cloud/spring-cloud-netflix/issues/768
# 超時(shí)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
2.3 添加實(shí)體用戶類User(springms-consumer-movie-feign-custom\src\main\java\com\springms\cloud\entity\User.java)
package com.springms.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;
}
}
2.4 添加訪問(wèn)遠(yuǎn)端服務(wù) Feign 客戶端(springms-consumer-movie-feign-custom\src\main\java\com\springms\cloud\feign\UserFeignCustomClient.java)
package com.springms.cloud.feign;
import com.springms.cloud.entity.User;
import com.springms.config.TestFeignCustomConfiguration;
import feign.Param;
import feign.RequestLine;
import org.springframework.cloud.netflix.feign.FeignClient;
/**
* 用戶Http請(qǐng)求的客戶端织狐,F(xiàn)eignClient 注解地方采用了自定義的配置。
*
* 注解FeignClient的傳參:表示的是注冊(cè)到 Eureka 服務(wù)上的模塊名稱掘殴。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@FeignClient(name = "springms-provider-user", configuration = TestFeignCustomConfiguration.class)
public interface UserFeignCustomClient {
/**
* 這里的注解 RequestLine、Param 是 Feign 的配置新的注解粟誓,詳細(xì)請(qǐng)參考鏈接:https://github.com/OpenFeign/feign
*
* @param id
* @return
*/
@RequestLine("GET /simple/{id}")
public User findById(@Param("id") Long id);
}
/****************************************************************************************
參考代碼如下:
interface GitHub {
@RequestLine("GET /repos/{owner}/{repo}/contributors")
List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
}
static class Contributor {
String login;
int contributions;
}
public static void main(String... args) {
GitHub github = Feign.builder().decoder(new GsonDecoder()).target(GitHub.class, "https://api.github.com");
// Fetch and print a list of the contributors to this library.
List<Contributor> contributors = github.contributors("OpenFeign", "feign");
for (Contributor contributor : contributors) {
System.out.println(contributor.login + " (" + contributor.contributions + ")");
}
}
****************************************************************************************/
2.5 添加登錄認(rèn)證Eureka服務(wù) Feign 客戶端(springms-consumer-movie-feign-custom\src\main\java\com\springms\cloud\feign\UserFeignCustomSecondClient.java)
package com.springms.cloud.feign;
import com.springms.config.TestEurekaAuthConfiguration;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 用戶Http請(qǐng)求的客戶端奏寨,F(xiàn)eignClient 注解地方采用了自定義的配置。
*
* 注解FeignClient的傳參:表示的是注冊(cè)到 Eureka 服務(wù)上的模塊名稱鹰服。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@FeignClient(name = "xxx", url = "http://localhost:8761/", configuration = TestEurekaAuthConfiguration.class)
public interface UserFeignCustomSecondClient {
@RequestMapping(value = "/eureka/apps/{serviceName}")
public String findEurekaInfo(@PathVariable("serviceName") String serviceName);
}
2.6 添加訪問(wèn)遠(yuǎn)端服務(wù)配置類(springms-consumer-movie-feign-custom\src\main\java\com\springms\config\TestFeignCustomConfiguration.java)
package com.springms.config;
import feign.Contract;
import feign.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* 自定義配置病瞳。
*
* 不和 com.springms.cloud 在同級(jí)目錄,因?yàn)槲臋n有說(shuō)明悲酷,該配置文件不需要被掃描到套菜。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@Configuration
public class TestFeignCustomConfiguration {
@Bean
public Contract feignContract(){
return new feign.Contract.Default();
}
/**
* 日志級(jí)別配置
*
* @return
*/
@Bean
Logger.Level feignLoggerLevel(){
return Logger.Level.FULL;
}
}
2.7 添加登錄認(rèn)證Eureka服務(wù)配置(springms-consumer-movie-feign-custom\src\main\java\com\springms\config\TestEurekaAuthConfiguration.java)
package com.springms.config;
import feign.auth.BasicAuthRequestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* 認(rèn)證配置,由于 UserFeignCustomSecondClient 訪問(wèn) http://localhost:8761/ 需要密碼登錄设易,所以才有了此配置的出現(xiàn)逗柴。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@Configuration
public class TestEurekaAuthConfiguration {
/**
* 此方法主要配置登錄 Eureka 服務(wù)器的帳號(hào)與密碼。
*
* @return
*/
@Bean
public BasicAuthRequestInterceptor basicAuthRequestInterceptor(){
return new BasicAuthRequestInterceptor("admin", "admin");
}
}
2.8 添加Web訪問(wèn)層Controller(springms-consumer-movie-feign-custom\src\main\java\com\springms\cloud\controller\MovieFeignCustomController.java)
package com.springms.cloud.controller;
import com.springms.cloud.entity.User;
import com.springms.cloud.feign.UserFeignCustomClient;
import com.springms.cloud.feign.UserFeignCustomSecondClient;
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;
/**
* 自定義 Feign 控制器顿肺。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@RestController
public class MovieFeignCustomController {
@Autowired
private UserFeignCustomClient userFeignCustomClient;
@Autowired
private UserFeignCustomSecondClient userFeignCustomSecondClient;
@GetMapping("/movie/{id}")
public User findById(@PathVariable Long id) {
return userFeignCustomClient.findById(id);
}
@GetMapping("/{serviceName}")
public String findEurekaInfo(@PathVariable String serviceName){
return userFeignCustomSecondClient.findEurekaInfo(serviceName);
}
}
2.9 添加電影微服務(wù)啟動(dòng)類(springms-consumer-movie-feign-custom\src\main\java\com\springms\cloud\MsConsumerMovieFeignCustomApplication.java)
package com.springms.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;
/**
*
* 電影微服務(wù)使用定制化 Feign 在客戶端進(jìn)行負(fù)載均衡調(diào)度并為 Feign 配置帳號(hào)密碼登錄認(rèn)證 Eureka戏溺。
*
* Feign: Java HTTP 客戶端開(kāi)發(fā)的工具。
*
* 注解 EnableFeignClients 表示該電影微服務(wù)已經(jīng)接入 Feign 模塊屠尊。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 2017/9/19
*
*/
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class MsConsumerMovieFeignCustomApplication {
public static void main(String[] args) {
SpringApplication.run(MsConsumerMovieFeignCustomApplication.class, args);
System.out.println("【【【【【【 電影自定義Feign微服務(wù) 】】】】】】已啟動(dòng).");
}
}
三旷祸、測(cè)試
/****************************************************************************************
一、電影微服務(wù)使用定制化Feign在客戶端進(jìn)行負(fù)載均衡調(diào)度并為Feign配置帳號(hào)密碼登錄認(rèn)證Eureka(測(cè)試接入 Feign 模塊):
1讼昆、注解:EnableFeignClients
2托享、啟動(dòng) springms-discovery-eureka 模塊服務(wù),啟動(dòng)1個(gè)端口;
3闰围、啟動(dòng) springms-provider-user 模塊服務(wù)赃绊,啟動(dòng)1個(gè)端口;
4辫诅、啟動(dòng) springms-consumer-movie-feign-custom 模塊服務(wù)凭戴;
5、在瀏覽器輸入地址http://localhost:8050/movie/1 可以看到信息成功的被打印出來(lái)炕矮;
總結(jié):說(shuō)明接入 Feign 已經(jīng)成功通過(guò)測(cè)試么夫;
****************************************************************************************/
/****************************************************************************************
二、電影微服務(wù)使用定制化Feign在客戶端進(jìn)行負(fù)載均衡調(diào)度并為Feign配置帳號(hào)密碼登錄認(rèn)證Eureka(測(cè)試登錄 Eureka 服務(wù)器需要認(rèn)證配置):
1肤视、注解:EnableFeignClients
2档痪、啟動(dòng) springms-discovery-eureka 模塊服務(wù),啟動(dòng)1個(gè)端口邢滑;
3腐螟、啟動(dòng) springms-provider-user 模塊服務(wù),啟動(dòng)1個(gè)端口困后;
4乐纸、啟動(dòng) springms-consumer-movie-feign-custom 模塊服務(wù);
5摇予、在瀏覽器輸入地址 http://localhost:8050/springms-provider-user 可以看到信息成功的被打印出來(lái)汽绢;
總結(jié):說(shuō)明 TestEurekaAuthConfiguration 類中配置的帳號(hào)密碼已經(jīng)生效,可以正常訪問(wèn) Eureka 服務(wù)侧戴;
****************************************************************************************/
/****************************************************************************************
三宁昭、電影微服務(wù)使用定制化Feign在客戶端進(jìn)行負(fù)載均衡調(diào)度并為Feign配置帳號(hào)密碼登錄認(rèn)證Eureka(測(cè)試接入 Feign 模塊進(jìn)行負(fù)載均衡):
1、注解:EnableFeignClients
2酗宋、啟動(dòng) springms-discovery-eureka 模塊服務(wù)积仗,啟動(dòng)1個(gè)端口;
3蜕猫、啟動(dòng) springms-provider-user 模塊服務(wù)寂曹,啟動(dòng)3個(gè)端口(7900、7899回右、7898)稀颁;
4、啟動(dòng) springms-consumer-movie-feign-custom 模塊服務(wù)楣黍;
5匾灶、在瀏覽器輸入地址http://localhost:8050/movie/1 連續(xù)刷新9次,正常情況可以看到 springms-provider-user 的3個(gè)端口輪詢打印用戶日志信息租漂;
總結(jié):1阶女、說(shuō)明接入 Feign 已經(jīng)成功的在客戶端進(jìn)行了負(fù)載均衡處理颊糜;
2、之所以會(huì)在客戶端進(jìn)行輪詢打印日志信息秃踩,是因?yàn)闆](méi)有配置調(diào)度算法衬鱼,而默認(rèn)的調(diào)度算法就是輪詢,所以會(huì)出現(xiàn)輪詢打印日志信息憔杨;
****************************************************************************************/
/****************************************************************************************
四鸟赫、電影微服務(wù)使用定制化Feign在客戶端進(jìn)行負(fù)載均衡調(diào)度并為Feign配置帳號(hào)密碼登錄認(rèn)證Eureka(配置日志級(jí)別):
1、application.yml 修改:logging.level.com.springms.cloud.feign.UserFeignCustomClient: DEBUG
2消别、編寫 TestFeignCustomConfiguration 新增日志級(jí)別的方法
3抛蚤、啟動(dòng) springms-discovery-eureka 模塊服務(wù),啟動(dòng)1個(gè)端口寻狂;
4岁经、啟動(dòng) springms-provider-user 模塊服務(wù),啟動(dòng)1個(gè)端口蛇券;
5缀壤、啟動(dòng) springms-consumer-movie-feign-custom 模塊服務(wù);
6纠亚、在瀏覽器輸入地址http://localhost:8050/springms-provider-user 可以看到控制臺(tái)中 DEBUG 日志級(jí)別的信息成功的被打印出來(lái)塘慕;
****************************************************************************************/
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