springmvc上传下载文件

控制层： @RequestMapping(value = "/register", method = RequestMethod.POST )
public String register(HttpServletRequest request, @ModelAttribute User user, Model model) throws Exception {
System.out.println(user.getUsername());
// 如果文件不为空，写入上传路径
if (!user.getImage().isEmpty()) {
// 上传文件路径
String path = request.getServletContext().getRealPath("/images/");
// 上传文件名
String filename = user.getImage().getOriginalFilename();
File filepath = new File(path, filename);
// 判断路径是否存在，如果不存在就创建一个
if (!filepath.getParentFile().exists()) {
filepath.getParentFile().mkdirs();
}
// 将上传文件保存到一个目标文件当中
user.getImage().transferTo(new File(path + File.separator + filename));
// 将用户添加到model
model.addAttribute("user", user);
return "userinfo";
} else {
return "error";
}

}

@RequestMapping(value = "/download")
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/");
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);
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);

}

前端：

下载页面

<%@ 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>
</head>
<body>
<h3>文件下载</h3>
<a href="download?filename=${requestScope.user.image.originalFilename}">
${requestScope.user.image.originalFilename }
</a>
</body>

</html>

上传页面：

<%@ 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>用户注册</title>
</head>
<body>
<h2>用户注册</h2>
<form action="register" enctype="multipart/form-data" method="post">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>请上传头像:</td>
<td><input type="file" name="image"></td>
</tr>
<tr>
<td><input type="submit" value="注册"></td>
</tr>
</table>
</form>
</body>
</html>

springmvc配置页面 <bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

<property name="maxUploadSize">
<value>10485760</value>
</property>

<property name="defaultEncoding">
<value>UTF-8</value>
</property>

</bean>

jar包：

springmvc上传下载文件

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