此demo有bug，请下载最新的文件上传的案例

package com; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.upload.FormFile; public class Test extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); MultiUploadForm multiUploadForm = (MultiUploadForm) form; String path=getServlet().getServletContext().getRealPath("/upload"); String filename=""; System.out.println("****************"); List myFiles = multiUploadForm.getMyFiles(); String fileStr = ""; for (int i = 0; i < myFiles.size(); i++) { UploadFile uploadFile = (UploadFile) myFiles.get(i); FormFile file = uploadFile.getFile(); if (file == null) { System.out.println("file is null"); }else{ filename=file.getFileName(); InputStream is=file.getInputStream(); System.out.println(filename+"++++++++++"); OutputStream os=new FileOutputStream(path+"/"+filename); byte[]result=new byte[is.available()]; //写入数组中 is.read(result); //写入文件 os.write(result); os.flush(); is.close(); os.close(); } } return null; } }