springMVC文件下载
springMVC文件下载
1、编写 java 实现
@Controller
public class FileController {
@RequestMapping("/download")
public ResponseEntity<byte[]> download(HttpSession session) throws IOException {
// 获取ServletContext对象
ServletContext context = session.getServletContext();
// 获取服务器中文件的真实路径
String path = context.getRealPath("static/img/computer.png");
// 获取该文件的输入流
FileInputStream inputStream = new FileInputStream(path);
// 创建字节数组
byte[] bytes = new byte[inputStream.available()];
// 将输入流读到字节数组中
inputStream.read(bytes);
// 创建HttpHeaders对象设置响应头信息
MultiValueMap<String, String> headers = new HttpHeaders();
// 设置文件下载方式以及下载文件的名字
headers.add("Content-Disposition","attachment;filename="+ URLEncoder.encode("图片.png","UTF-8"));
// 设置响应报文的状态码
HttpStatus status = HttpStatus.OK;
// 创建ResponseEntity对象设置响应报文
ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes, headers, status);
// 关闭输入流
inputStream.close();
return responseEntity;
}
}
2、html
index.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a th:href="@{/download}">下载</a>
</body>
</html>
3、演示
