SpringMVC框架实现文件的上传和下载

package cn.edu.jseti.controller; import java.io.File; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.FileUtils; import cn.edu.jseti.domain.User; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; /** * @author Cody * @version V1.0 */ @Controller public class FileUploadController { @RequestMapping(value="/{formName}") public String loginForm(@PathVariable String formName) { // 动态跳转页面 return formName; } //上传文件会自动绑定到MultipartFile中 @RequestMapping(value="/upload",method=RequestMethod.POST) public String upload(HttpServletRequest request, @RequestParam("description") String description, @RequestParam("file") MultipartFile file) throws Exception { System.out.println(description); //如果文件不为空，写入上传路径 if(!file.isEmpty()) { //上传文件路径 String path = request.getServletContext().getRealPath("/images/"); //上传文件名 String filename = file.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 file.transferTo(new File(path + File.separator + filename)); return "success"; } else { return "error"; } } @RequestMapping(value="/register") 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); } }