Java后端模拟前端请求

package com.example.hystrix.controller;

import org.springframework.core.io.FileSystemResource;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.io.File;

public class Demo{

    public void uploadTest() {

        String url = "http://localhost:8080/upload"; //上传的地址
        String filePath = "D:/test/test.mp4";

        RestTemplate rest = new RestTemplate();
        FileSystemResource resource = new FileSystemResource(new File(filePath));
        MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
        param.add("file", resource); //MultipartFile的名称
        String restResult = rest.postForObject(url, param, String.class);
        System.out.println(restResult);
    }
}