使用fileupload组件实现文件上传功能

<%@ page language="java" cOntentType="text/html; charset=utf-8"
 pageEncoding="utf-8"%>







 
 
 
 
 

package pers.zhang.servlet;

import java.io.File;
import java.io.IOException;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;


public class UploadServlet extends HttpServlet {
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 doPost(request, response);
 }


 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 DiskFileItemFactory factory=new DiskFileItemFactory();
 ServletFileUpload upload=new ServletFileUpload(factory);
 
 request.setCharacterEncoding("utf-8");
 //文件名中文乱码处理也可以如此写
// upload.setHeaderEncoding("utf-8");
 
 //设置缓冲区大小与临时文件目录
 factory.setSizeThreshold(1024*1024*10);
 File uploadTemp=new File("e:\\uploadTemp");
 uploadTemp.mkdirs();
 factory.setRepository(uploadTemp);
 
 //设置单个文件大小限制
 upload.setFileSizeMax(1024*1024*10);
 //设置所有文件总和大小限制
 upload.setSizeMax(1024*1024*30);
 
 try {
 List list=upload.parseRequest(request);
 System.out.println(list);
 for (FileItem fileItem:list){
 if (!fileItem.isFormField()&&fileItem.getName()!=null&&!"".equals(fileItem.getName())){
  String filName=fileItem.getName();
  //利用UUID生成伪随机字符串，作为文件名避免重复
  String uuid= UUID.randomUUID().toString();
  //获取文件后缀名
  String suffix=filName.substring(filName.lastIndexOf("."));
 
  //获取文件上传目录路径，在项目部署路径下的upload目录里。若想让浏览器不能直接访问到图片，可以放在WEB-INF下
  String uploadPath=request.getSession().getServletContext().getRealPath("/upload");
 
  File file=new File(uploadPath);
  file.mkdirs();
  //写入文件到磁盘，该行执行完毕后，若有该临时文件，将会自动删除
  fileItem.write(new File(uploadPath,uuid+suffix));
  
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

}