Spring Boot 处理文件上传和下载 REST方式处理文件服务

我会带着你远行 2022-05-10 04:03 191阅读 0赞

## 测试用例 ##

@Test
    	public void whenUploadSuccess() throws Exception {
    		String result = mockMvc.perform(fileUpload("/file")
    				.file(new MockMultipartFile("file", "test.txt", "multipart/form-data", "hello upload".getBytes("UTF-8"))))
    				.andExpect(status().isOk())
    				.andReturn().getResponse().getContentAsString();
    		System.out.println(result);
    	}

## 上传实现 ##

public class FileInfo {
    	public FileInfo(String path){
    		this.path = path;
    	}
    	private String path;
    	}

private String folder = "/Users/zhailiang/controller";
    
    	@PostMapping
    	public FileInfo upload(MultipartFile file) throws Exception {
    		System.out.println(file.getName()); //file
    		System.out.println(file.getOriginalFilename());
    		System.out.println(file.getSize());
    		File localFile = new File(folder, new Date().getTime() + ".txt");
    		file.transferTo(localFile);
    		return new FileInfo(localFile.getAbsolutePath());
    	}

## 下载实现 ##

@GetMapping("/{id}")
    	public void download(@PathVariable String id, HttpServletRequest request, HttpServletResponse response) throws Exception {
    
    		try (InputStream inputStream = new FileInputStream(new File(folder, id + ".txt"));
    				OutputStream outputStream = response.getOutputStream();) {
    			
    			response.setContentType("application/x-download");
    			response.addHeader("Content-Disposition", "attachment;filename=test.txt");
    			
    			IOUtils.copy(inputStream, outputStream);
    			outputStream.flush();
    		} 
    //try括号后的流会自动释放
    	}
    
    		<dependency>
    			<groupId>commons-io</groupId>
    			<artifactId>commons-io</artifactId>
    		</dependency>

> response.setContentType(“application/x-download”);  
> response.addHeader(“Content-Disposition”, “attachment;filename=test.txt”);