commons组件实现文件上传
文件上传使用的是apache下common里面的fileupload和io组件，请先去http://commons.apache.org/downloads/下载组件需要的包，我这里使用的是：commons-fileupload-1.2.1.jar和commons-io-1.4.jar下面是测试程序代码：
<%@ page language="java"pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <base href="<%=basePath%>"> <title>upload file</title> </head> <body> <form action="<%=basePath %>UploadServlet" method="post" enctype="multipart/form-data"> username:<input type="text" name="username" value=""><br> password:<input type="password" name="password" value=""><br> file1:<input type="file" name="file1" value=""><br> file2:<input type="file" name="file2" value=""><br> <input type="submit" name="submit" value=" submit "> <input type="reset" name="reset" value=" reset "> </form></body></html> 后台处理servlet实例中的dopost方法：
package com.test.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadServlet extends HttpServlet {@SuppressWarnings("unchecked")public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();//String path = request.getRealPath("/upload");String path = this.getServletContext().getRealPath("/upload");factory.setRepository(new File(path));factory.setSizeThreshold(1024 * 1024);ServletFileUpload upload = new ServletFileUpload(factory);try{List<FileItem> list = upload.parseRequest(request);for(FileItem item : list){if(item.isFormField()){String name = item.getFieldName();String value = item.getString("GBK");//System.out.println(name);request.setAttribute(name, value);}else{String name = item.getFieldName();String value = item.getName();System.out.println(name);int start = value.lastIndexOf("\\");String fileName = value.substring(start + 1);request.setAttribute(name, fileName);/** 写入方式：(1)*/item.write(new File(path,fileName));/** 写入方式：(2)OutputStream os = new FileOutputStream(new File(path,fileName));InputStream is = item.getInputStream();byte[] buffer = new byte;int length = 0;while((length = is.read(buffer)) > 0){os.write(buffer, 0, length);}os.close();is.close();*/}}}catch(Exception e){e.printStackTrace();} request.getRequestDispatcher("upload/result.jsp").forward(request, response);}} 结果的简单展示：(上传文件只显示了文件名)
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <base href="<%=basePath%>"> <title>My JSP 'result2.jsp' starting page</title> </head> <body> username:${username }<br> password:${password }<br> file1:${file1 }<br> file2:${file2 }<br></body></html>
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