一、 Feign簡介

Feign [fe?n] 譯文 偽裝。Feign是一個(gè)聲明式WebService客戶端.使用Feign能讓編寫WebService客戶端更加簡單,它的使用方法是定義一個(gè)接口，然后在上面添加注解。不再需要拼接URL，參數(shù)等操作。項(xiàng)目主頁：https://github.com/OpenFeign/feign 。

• 集成Ribbon的負(fù)載均衡功能
• 集成了Hystrix的熔斷器功能
• 支持請(qǐng)求壓縮
• 大大簡化了遠(yuǎn)程調(diào)用的代碼，同時(shí)功能還增強(qiáng)啦
• Feign以更加優(yōu)雅的方式編寫遠(yuǎn)程調(diào)用代碼，并簡化重復(fù)代碼

快速入門

實(shí)現(xiàn)步驟：

導(dǎo)入feign依賴

編寫Feign客戶端接口

消費(fèi)者啟動(dòng)引導(dǎo)類開啟Feign功能注解

訪問接口測試

1. 導(dǎo)入feign依賴

<!--配置feign--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency>

1.1創(chuàng)建實(shí)體類User

package com.william.domain;import java.util.Date;/*** @author ：lijunxuan* @date ：Created in 2019/6/30 18:20* @description ：* @version: 1.0*/ public class User {private Integer id;//主鍵idprivate String username;//用戶名private String password;//密碼private String name;//姓名private Integer age;//年齡private Integer sex;//性別 1男性，2女性private Date birthday; //出生日期private Date created; //創(chuàng)建時(shí)間private Date updated; //更新時(shí)間private String note;//備注@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", name='" + name + '\'' +", age=" + age +", sex=" + sex +", birthday=" + birthday +", created=" + created +", updated=" + updated +", note='" + note + '\'' +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Date getCreated() {return created;}public void setCreated(Date created) {this.created = created;}public Date getUpdated() {return updated;}public void setUpdated(Date updated) {this.updated = updated;}public String getNote() {return note;}public void setNote(String note) {this.note = note;} }

2. 編寫Feign客戶端接口

package com.william.service;import com.william.domain.User; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam;@FeignClient("user-service") public interface UserClient {/***RequestMapping* spring mvc 里面的注解* RequestMapping 反向映射，生成請(qǐng)求地址。http請(qǐng)求* @RequestParam("id") 是必須要進(jìn)行請(qǐng)求地址參數(shù)的綁定* @param id* @return*/@RequestMapping("/user/findById")User findById(@RequestParam("id") Integer id); }

3. 消費(fèi)者啟動(dòng)引導(dǎo)類DemoApplication開啟Feign功能注解

@EnableFeignClients//開啟feign客戶端支持

3.1編寫ConsumerFeignController，使用UserClient訪問

package com.william.controller;import com.william.domain.User; import com.william.service.UserClient; import org.springframework.stereotype.Repository; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;/*** @author ：lijunxuan* @date ：Created in 2019/6/30 18:33* @description ：* @version: 1.0*/ @RestController public class FeigConsumerController {@ResourceUserClient userClient;//注入FeignCLient@RequestMapping("/findByIdFeign")public User findByIdFeign(Integer id){return userClient.findById(id);} }

4. 訪問接口測試

總結(jié)

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