文件上传

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;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;@WebServlet("/servlet/uploadServlet")public class FileUpload extends HttpServlet {      private static String storeDirectory = null;@Overridepublic void init() throws ServletException {// TODO Auto-generated method stubString  storeFile = "/uploadfiles";    storeDirectory = getServletContext().getRealPath(storeFile);System.out.println(storeDirectory);File file = new File(storeDirectory);if(!file.exists()){file.mkdir();}}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {boolean b = ServletFileUpload.isMultipartContent(request);if(!b) {throw new RuntimeException("不是一個文件上传处理！");}DiskFileItemFactory factory = new DiskFileItemFactory();//设置缓存大小(Kb)factory.setSizeThreshold(20);List<FileItem> items =null;//获取ServletFileUpload对象ServletFileUpload upload = new ServletFileUpload(factory);try {//将请求载入 items = upload.parseRequest(request);} catch (FileUploadException e) {// TODO Auto-generated catch blocke.printStackTrace();}for (FileItem item : items) {//如果是普通的类型字段if(item.isFormField()) {System.out.println(item.getFieldName()+"---"+item.getContentType());//其他情况则代表上传}else{//自定义函数处理上传文件 processUploadedFile(item);}}}private void processUploadedFile(FileItem item) { String filename = item.getName(); File file = new File(storeDirectory+"/"+filename); try {item.write(file);} catch (Exception e) {throw new RuntimeException("文件寫入失敗"+e);}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}