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">
<!-- 上传文件大小上限,单位为字节(10MB) -->
<property name="maxUploadSize">
<value>10485760</value>
</property>
<!-- 请求的编码格式,必须和jSP的pageEncoding属性一致,以便正确读取表单的内容,默认为ISO-8859-1 -->
<property name="defaultEncoding">
<value>UTF-8</value>
</property>
</bean>
jar包: