1.效果
2. 后台
2.1 实体类加两个属性
上传的时候 保存属性
2.2 页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件下载</title>
<style>
.expa{ width:120px; height:80px; border:1px solid #F00}
.expb{ width:200px; height:120px; border:1px solid #00F}
</style>
</head>
<body>
<h3>文件下载</h3>
<div>
<img alt="" src="${requestScope.user.filepath}" width="400px" height="300px">
</div>
<a href="${pageContext.request.contextPath }/download.action?filename=${requestScope.user.realname}">
${requestScope.user.image.originalFilename }
</a>
</body>
</html>
2.3 后台 代码
/**
* 6. 下载文件
* @param request
* @param filename
* @param model
* @return
* @throws Exception
*/
@RequestMapping(value="/download.action")
public ResponseEntity<byte[]> download(HttpServletRequest request, @RequestParam("filename") String filename, Model model)throws Exception {
//下载文件路径
// String path = request.getServletContext().getRealPath("/images/");
String temp =request.getServletContext().getContextPath();
String path = "D:/workspace"+temp+"/src/main/webapp/img";
File file = new File(path + File.separator + filename);
HttpHeaders headers = new HttpHeaders();
//下载显示的文件名，解决中文名称乱码问题
String downloadFielName = new String(filename.getBytes("UTF-8"),"iso-8859-1");
//通知浏览器以attachment（下载方式）打开图片
headers.setContentDispositionFormData("attachment", downloadFielName);
//application/octet-stream ： 二进制流数据（最常见的文件下载）。
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);// MediaType 用spring框架的
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), // FileUtils 选择 org.apache.commons.io.FileUtils
headers, HttpStatus.CREATED);
}
