<body>
<br />
<br />
<form action="${pageContext.request.contextPath}/user/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" /> <input type="submit" value=" 上 传 " />
</form>
<br />
<br />
<br />
<a href="${pageContext.request.contextPath}/user/download?fileName=${fileUrl}">下载文件</a>
</body>
后台代码
/**
*
* @author
*/
@Controller
@RequestMapping("/user")
public class UserController extends BaseController {
@Autowired
private UserService userService;
/**
* 跳转用户文件上传页面
*
* @return
*/
@RequestMapping(value = "/uploadPage")
public String uploadPage() {
return "/admin/newFile";
}
//上传文件
@RequestMapping(value = "/upload")
public String upload(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request, ModelMap model) {
System.out.println("开始");
// getRealPath("/") 得到的就是你tomcat下webapps下的项目根路径
String path = request.getSession().getServletContext().getRealPath("upload");
String fileName = file.getOriginalFilename();
// String fileName = new Date().getTime()+".jpg";
System.out.println(path);
File targetFile = new File(path, fileName);
if (!targetFile.exists()) {
targetFile.mkdirs();
}
// 保存
try {
file.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
}
model.addAttribute("fileUrl", fileName);
return "/admin/newFile";
}
//下载文件
@RequestMapping("/download")
public String download(String fileName, HttpServletRequest request, HttpServletResponse response) {
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
try {
String path = request.getSession().getServletContext().getRealPath("upload") + File.separator;
String temp = request.getParameter("fileName");
InputStream inputStream = new FileInputStream(new File(path + fileName));
OutputStream os = response.getOutputStream();
byte[] b = new byte[2048];
int length;
while ((length = inputStream.read(b)) > 0) {
os.write(b, 0, length);
}
// 这里主要关闭。
os.close();
inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
// 返回值要注意，要不然就出现下面这句错误！
return null;
}
}