SpringMVC通过ResponseEntity实现文件下载

使用ResponseEntity实现下载文件的功能

所下载的图片路径如图所示:
SpringMVC通过ResponseEntity实现文件下载_第1张图片

Controller:

@RequestMapping("/testDown")
public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException {
    //获取ServletContext对象
    ServletContext servletContext = session.getServletContext();
    //获取服务器中文件的真实路径
    String realPath = servletContext.getRealPath("/static/img/panda.jpg");
    //创建输入流
    InputStream is = new FileInputStream(realPath);
    //创建字节数组
    byte[] bytes = new byte[is.available()];
    //将流读到字节数组中
    is.read(bytes);
    //创建HttpHeaders对象设置响应头信息
    MultiValueMap<String, String> headers = new HttpHeaders();
    //设置要下载方式以及下载文件的名字
    headers.add("Content-Disposition", "attachment;filename=panda.jpg");
    //设置响应状态码
    HttpStatus statusCode = HttpStatus.OK;
    //创建ResponseEntity对象
    ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes, headers, statusCode);
    //关闭输入流
    is.close();
    return responseEntity;
}

前端页面:

DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>文件上传和下载title>
head>
<body>
<a th:href="@{/testDown}">下载panda.jpga>
body>
html>

运行结果:
SpringMVC通过ResponseEntity实现文件下载_第2张图片
SpringMVC通过ResponseEntity实现文件下载_第3张图片

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