springBoot中使用使用junit测试文件上传，以及文件下载接口编写

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import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;

@RunWith(SpringRunner.class)
@SpringBootTest
public class BootStarterSecurityDemoApplicationTests {

  @Test
  public void contextLoads() {
  }

  @Autowired
  private WebApplicationContext wac;

  private MockMvc mockMvc;

  /**
   * 在每次测试执行前构建mvc环境
   */
  @Before
  public void setup() {
    mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
  }
  /**
   * 测试上传文件
   */
  @Test
  public void whenUploadFileSuccess() {
    try {
     String result =  mockMvc.perform(
          MockMvcRequestBuilders
              .fileUpload("/file")
              .file(
                  new MockMultipartFile("file", "test.txt", ",multipart/form-data", "hello upload".getBytes("UTF-8"))
              )
      ).andExpect(MockMvcResultMatchers.status().isOk())
      .andReturn().getResponse().getContentAsString();
      System.out.println(result);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

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package com.micro.fast.security.demo.controller;

import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

@RestController
@RequestMapping("/file")
public class FileController {
  /**
   * 处理文件上传
   * @param file
   */
  @PostMapping
  public  String  upload(MultipartFile file){
    File localfile = new File("/file/name");
    try {
      //将文件上传到本地路径
      file.transferTo(localfile);
    } catch (IOException e) {
      e.printStackTrace();
    }
    String fileInfo = "";
    fileInfo += file.getName()+file.getOriginalFilename()+file.getContentType();
    return fileInfo;
  }

  /**
   * 文件的下载
   * @param id
   * @param request
   * @param response
   */
  @GetMapping("/{id}")
  public void download(@PathVariable String id , HttpServletRequest request, HttpServletResponse response){
    try (InputStream inputStream = new FileInputStream(new File("/root/file/name"));
         OutputStream outputStream = response.getOutputStream();
    ){
      response.setContentType("application/x-download");
      //指定文件的名称
      response.addHeader("Content-Disposition","attachment;filename=test.txt");
      IOUtils.copy(inputStream,outputStream);
      outputStream.flush();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}