Feign傳參注意

最近在用SpringCloud嘗試重構以前的項目秽晚，使用Feign客戶端組件來調用微服務瓦糟，經(jīng)常出現(xiàn)參數(shù)傳不過去變成null的問題，網(wǎng)上查了一下發(fā)現(xiàn)feign在參數(shù)上的使用還是有一定的限制的赴蝇，主要是要注意：

1. 當參數(shù)比較復雜時菩浙，feign即使聲明為get請求也會強行使用post請求

2. 不支持@GetMapping類似注解聲明請求，需使用@RequestMapping(value = "url",method = RequestMethod.GET)

3. 使用@RequestParam注解時必須要在后面加上參數(shù)名

寫了一個簡單案例，同時傳輸一個對象和一個字符串作為請求參數(shù)劲蜻，

消費端controller

package com.taotao.feignchuanzhi.controller;

import com.sun.org.apache.xerces.internal.xs.datatypes.ObjectList;
import com.taotao.feignchuanzhi.entity.User;
import com.taotao.feignchuanzhi.service.FeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
public class FeignController {
  @Autowired
    private FeignService feignService;
//String 類型傳值通過feign傳遞
    @RequestMapping("/getOrderName")
    public  String getOrderName(String name){
        return  feignService.getName(name);
    }

  /**
     * feign 多個參數(shù)傳值
     * @param name
     * @param pass
     * @return
     */

  @RequestMapping("/getOrderNameMore")
    public  String getOrderNameMore(String name,String pass){
        return  feignService.getNameMore(name,pass);
    }


    /**
     * feign 傳遞 model 類型的值
     * @param user
     * @return
     */

    @RequestMapping("/getuserOrder")
     public String user(User user){
        return feignService.getUser(user);
 }



}

feignService

package com.taotao.feignchuanzhi.service;

import com.taotao.feignchuanzhi.entity.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@FeignClient("app-itmayiedu-member")
public interface FeignService {
  /**
     *  feign 傳遞 string 類型的值
     * @RequestParam("name") String name  必須要有
     * 也可以 @RequestParam(value="name") String name  + value
     *
     * @param name
     * @return
     */
  @RequestMapping("/getName")
    public String getName(@RequestParam("name") String name);  //必須加上@RequestParam("name") 才能傳值

    /**
     * feign 多個參數(shù)傳值
     * @param name
     * @param pass
     * @return
     */

   @RequestMapping("/getNameMore")
    public String getNameMore(@RequestParam("name") String name,@RequestParam(value="pass") String pass);  //必須加上@RequestParam("name") 才能傳值


    /**
     * feign 傳遞 model 類型的值
     * @param user
     * @RequestBody  必須要有
     * @return
     */

         @RequestMapping("/getUser")
      public String getUser(@RequestBody User user);


}

會員端被調用的controller

package com.taotao.springcloud_erueka_member.controller;

import com.taotao.springcloud_erueka_member.entity.User;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;

@RestController
public class MemberController {
    @Value("${server.port}")
    private  String port;
@RequestMapping("/getMember")
    public String getMember(){
        return  "this is getMember,端口為："  +port;
    }

    /**
     * 傳遞 String  類型的值
     * @param name
     * @return
     */
    @RequestMapping("/getName")
    public String getName(String name){
    return  "feign傳遞參數(shù)"+name;
    }

    /**
     * feign 多個參數(shù)傳值
     * @param name
     * @param pass
     * @return
     */
    @RequestMapping("/getNameMore")
    public String getNameMore(@RequestParam("name") String name, @RequestParam(value="pass") String pass){
          return "feign傳遞多參數(shù)的值"+name+pass;
    }


    /**
     * feign 傳遞 module l類型的值
     * @param user
     * @return
     */
    @RequestMapping("/getUser")
    public String getUser(@RequestBody User user){
            return "feign傳遞model類型的值"+user.getName()+user.getPass();
    }

}