javaee上传文件实例

package cn.cupcat.controller; import java.io.File; import java.io.IOException; import java.sql.Timestamp; import java.text.SimpleDateFormat; import java.util.Iterator; import java.util.List; import java.util.UUID; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import cn.cupcat.util.UploadUtil; public class UploadController extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; public static String uploadPath = "D:\\upload"; File repository; @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("我进入了post方法！"); //返回客户端消息 String resultMessage = ""; DiskFileItemFactory fileFactory = new DiskFileItemFactory(); //设置缓冲区大小 这里是4KB （单位是B 字节） fileFactory.setSizeThreshold(4096); //设置缓存 fileFactory.setRepository(repository); ServletFileUpload servletFileUpload = new ServletFileUpload(fileFactory); //设置文件上传的大小这里是4M servletFileUpload.setFileSizeMax(4194304); try { //得到上传文件列表 List<FileItem> fileItem = servletFileUpload.parseRequest(request); Iterator<FileItem> iterator = fileItem.iterator(); //得到保存路径 File saveDir = UploadUtil.getSavePath(request); while(iterator.hasNext()){ FileItem file = iterator.next(); if(file != null){ String fileName = file.getName(); if(fileName != null){ //System.out.println("上传文件的没有转码的文件名为："+fileName); //构建本地文件 File saveFile = new File(saveDir,UploadUtil.getSaveFileName(fileName)); file.write(saveFile); resultMessage = UploadUtil.getResponseResult(200, "上传成功！"); }else{ System.out.println("上传失败！"); resultMessage = UploadUtil.getResponseResult(300, "请选择上传文件，上传失败！"); } } } System.out.println("文件上传结束 ！"); } catch (FileUploadException e) { resultMessage = UploadUtil.getResponseResult(300, "文件上传错误，上传失败！"); e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); resultMessage = UploadUtil.getResponseResult(300, "文件上传错误，上传失败！"); } response.getWriter().print(resultMessage);//返回客户端 resultMessage } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doPost(req, resp); } }