初探Spring Cloud Fegin （参数传递篇）

SpringCloud中微服务之间的调用，传递参数时需要加相应的注解。主要用到的就是这三个注解@RequestBody，@RequestParam，@PathVariable

上一篇已经展示了怎么使用@RequestParam该注解，这一篇我们使用一下剩下的两种注解：

@PathVariable使用如下：

只需要在eureka-fegin-service和eureka-fegin-service-tmp的Controller中修改如下：

package com.cn.controller;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class EurekaFeginTmpController {

    @RequestMapping("/getName")
    public String getName(@RequestParam String name){
        return "hello2 : " + name;
    }

    @RequestMapping("/getName/{id}")
    public String getNameById(@PathVariable Long id){
        return "hello2 : " + id;
    }
}

eureka-fegin的FeginService接口修改如下：

package com.cn.service;

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.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "eureka-fegin-service")
public interface FeginService {

    @RequestMapping(value = "/getName", method = RequestMethod.GET)
    public String getName(@RequestParam("name") String name);

    @RequestMapping(value = "/getName/{id}", method = RequestMethod.GET)
    public String getNameById(@PathVariable("id") Long id);
}

controller修改如下：

package com.cn.controller;

import com.cn.service.FeginService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FeginController {
    @Autowired
    private FeginService feginService;

    @RequestMapping(value = "/getName")
    public String search(@RequestParam("name") String name){
        return feginService.getName(name);
    }

    @RequestMapping(value = "/getName/{id}")
    public String searchById(@PathVariable("id") Long id){
        return feginService.getNameById(id);
    }
}

访问：http://localhost:8088/getName/100

循环输出：hello1 : 100和hello2 : 100

@RequestParam使用如下：

User类如下：

package com.cn.entity;

import java.io.Serializable;

public class User implements Serializable {
    private String name;
    private Integer age;

    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;
    }
}

 

只需要在eureka-fegin-service和eureka-fegin-service-tmp的Controller中添加如下：

@RequestMapping("/getUser")
    public String getUser(@RequestBody User user){
        return "hello2 : " + user.getName() + ", age :" + user.getAge();
    }

只需要在eureka-fegin的FeginService接口中添加如下：

@RequestMapping(value = "/getUser", method = RequestMethod.POST)
    public String getUser(@RequestBody User user);

controller中修改如下：

 @RequestMapping(value = "/getUser")
    public String searchUser(@RequestBody User user){
        return feginService.getUser(user);
    }

用Postman请求如下：

会循环打印上述两个图片的内容

我把eureka-fegin的FeginService接口中的请求方式换成了GET，然后postman中用get请求，依然循环输出上面两张图

PS:至于网上说的用GET请求的话，如果传递对象会报错，我试了一下发现并没有网上说的那种错误，也不知道是最新版本进行更新了，还是我用postman请求的方式不对。