SpringMVC实现文件的下载

所需要的jar包

实现文件上传

 

<form action="testHttpMessageConverter" method="post" enctype="multipart/form-data">
		File: <input type="file" name="file"/>
		Desc: <input type="text" name="desc"/>
		<input type="submit" valuue="Submit"/>
	</form>

@ResponseBody
	@RequestMapping("/testHttpMessageConverter")
	public String testHttpMessageConverter(@RequestBody String body) {
		System.out.println(body);
		return "helloword! " + new Date();
	}

运行结果

将文件里的内容打印出来

实现文件下载

这里我们先在项目里放一个文件

<a href="testResponseEntity">Test ResponseEntity</a>

@RequestMapping("/testResponseEntity")
	public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException{
		byte [] body = null;
		ServletContext servletContext = session.getServletContext();
		InputStream in = servletContext.getResourceAsStream("/files/abc.txt");
		body = new byte[in.available()];
		in.read(body);
		
		HttpHeaders headers = new HttpHeaders();
		headers.add("Content-Disposition", "attachment;filename=abc.txt");
		
		HttpStatus statusCode = HttpStatus.OK;
		
		ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, statusCode);
		return response;
	}

运行结果