日期:2014-05-16 浏览次数:20988 次
<html> <head> <title>FileUpload</title> </head> <body> <form name="upform" action="./servlet/FileUpload" method="post" enctype="multipart/form-data"> <input type="file" name="file1" id="file1" /><br /> <input type="submit" value="Submit" /><br /> <input type="reset" value="重置"/> </form> </body> </html>
package com.howe.lmis.servlet; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.Iterator; import java.util.List; 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.FileUploadBase.SizeLimitExceededException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class FileUpload extends HttpServlet { private static final long serialVersionUID = 1L; public FileUpload() { super(); } public void init() throws ServletException { } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 设置上传文件最大为 3M final long MAX_SIZE = 3 * 1024 * 1024; // 允许上传的文件格式的列表 final String[] allowedExt = new String[] { "jpg", "jpeg", "gif", "txt", "doc", "docx", "mp3", "wma", "m4a" }; response.setContentType("text/html;charset=GB18030"); PrintWriter out = response.getWriter(); System.out.println(request.getContentLength()); System.out.println(request.getContentType()); // 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload DiskFileItemFactory dfif = new DiskFileItemFactory(); // 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘 dfif.setSizeThreshold(4096); // 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录 dfif.setRepository(new File("d:\\lmis\\temp")); // 用以上工厂实例化上传组件 ServletFileUpload sfu = new ServletFileUpload(dfif); // 设置最大上传尺寸 sfu.setSizeMax(MAX_SIZE); // 从request得到 所有 上传域的列表 Iterator<FileItem> fileItr = null; try { List<FileItem> fileList = sfu.parseRequest(request); // 没有文件上传 if (fileList == null || fileList.size() == 0) { out.println("请选择上传文件<p />"); out.println("<a href=\"/LMIS011/testFileUpload.jsp\">返回</a>"); return; } // 得到所有上传的文件 fileItr = fileList.iterator(); } catch (FileUploadException e) {// 处理文件尺寸过大异常 if (e instanceof SizeLimitExceededException) { out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />"); out.println("<a href=\"upload.html\" target=\"_top\">返回</a>"); return; } e.printStackTrace(); } // 循环处理所有文件 while (fileItr.hasNext()) { FileItem fileItem = null; String path = null; long size = 0; // 得到当前文件 fileItem = (FileItem) fileItr.next(); // 忽略简单form字段而不是上传域的文件域(<input type="text" />等) if (fileItem == null || fileItem.isFormField()) { continue; } // 得到文件的完整路径 path = fileItem.getName(); // 得到文件的大小 size = fileItem.getSize(); if ("".equals(path) || size == 0) { out.println("请选择上传文件<p />"); out.println("<a href=\"upload.html\" target=\"_top\">返回</a>"); return; }