Feign发送HTTP请求

在以往的 HTTP 调用中，调用方式经常将组装代码冗余到正常业务代码中，不够优雅，因此在接触到 Feign 后，考虑使其作为一个 HTTP 发送基础，来进行远程调用。

以springboot项目为例

 
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
		
        
            io.github.openfeign
            feign-jackson
            9.7.0
        

package com.example.xmldemo.feignService;

import com.example.xmldemo.result.Project1369CategoryTreeVo;
import com.example.xmldemo.result.ViewProjectReportParam;
import feign.*;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.http.HttpStatus;

import java.util.*;

public interface OutsideCallService {
    @RequestLine("GET /api/biz/outside/uploadProjectInfo?zjlx={zjlx}&gnfl={gnfl}&jzmj={jzmj}&filePath={filePath}&fileId={fileId}")
    Result uploadProjectInfo(@Param("zjlx") String zjlx, @Param("gnfl") String gnfl, @Param("jzmj") Double jzmj, @Param("filePath") String filePath, @Param("fileId") String fileId);


    @RequestLine("GET /api/biz/outside/tree")
    Result> tree();

    @RequestLine("POST /api/biz/outside/post")
    @Headers({"Content-Type: application/json"})
    Result postBook2(ViewProjectReportParam bookVo);


    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    class Result {
        // HTTP Response Status Code
        private HttpStatus httpStatus;

        private Integer status;

        // General Error message
        private String message;

        private Integer code;

        // Error code
        private String serviceStatus;

        private Date timestamp = new Date();

        private T data;

        private T extendData;
    }
    
}

package com.example.xmldemo;

import com.example.xmldemo.feignService.OutsideCallService;
import com.example.xmldemo.result.Project1369CategoryTreeVo;
import com.example.xmldemo.result.ViewProjectReportParam;
import feign.Feign;
import feign.jackson.JacksonDecoder;
import feign.jackson.JacksonEncoder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;

import java.util.List;


public class FeignTest {


    @Test
    public void test1(){
        OutsideCallService target = Feign.builder()
                .decoder(new JacksonDecoder())
                .encoder(new JacksonEncoder())
                .target(OutsideCallService.class, "http://localhost:8889");
        OutsideCallService.Result tree = target.uploadProjectInfo("002008001","001001001001002",122d,"http://localhost:8987/download","22222");
        Long data = tree.getData();
        System.out.println(data);
    }

    @Test
    public void test2(){
        OutsideCallService target = Feign.builder()
                .decoder(new JacksonDecoder())
                .encoder(new JacksonEncoder())
                .target(OutsideCallService.class, "http://localhost:8889");
        OutsideCallService.Result> tree = target.tree();
        List children = tree.getData();

        System.out.println(children);
    }


    @Test
    public void test3(){
        OutsideCallService target = Feign.builder()
                .decoder(new JacksonDecoder())
                .encoder(new JacksonEncoder())
                .target(OutsideCallService.class, "http://localhost:8889");
        ViewProjectReportParam viewProjectReportParam = new ViewProjectReportParam();
        viewProjectReportParam.setProjectId(23233L);
        viewProjectReportParam.setType(232);
        OutsideCallService.Result tree = target.postBook2(viewProjectReportParam);
        ViewProjectReportParam data = tree.getData();
        System.out.println(data);
    }

}