在我们的web开发中，很多的时候都需要把本机的一些文件上传到web服务器上面去
如：一个BBS系统，当用户使用这是系统的时候，能把本机的一些图片，文档上传到服务器
上面去。然后其他用户可以去下载这些文件，那么这样的话，我们可以自己编程实现文件的上传
但是更好的方式是使用一些已有的组件帮助我们实现这种上传功能。
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常用的上传组件：
Apache 的 Commons FileUpload
JavaZoom的UploadBean
jspSmartUpload
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FileUpload下载地址：
下载：commons-fileupload-1.2.2-bin.zip 得到：commons-fileupload-1.2.2.jar
下载：commons-io-1.4-bin.zip 得到：commons-io-1.4.jar
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upload.jsp
代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"%>using commons Upload to upload file 请您选择需要上传的文件
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FileUploadServlet.java
代码：
/** * */package com.b510.example;import java.io.File;import java.io.IOException;import java.util.*;import javax.servlet.ServletConfig;import javax.servlet.ServletContext;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * * @author XHW * * @date 2011-7-26 * */public class FileUploadServlet extends HttpServlet { private static final long serialVersionUID = -7744625344830285257L; private ServletContext sc; private String savePath; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void init(ServletConfig config) {// 在web.xml中设置的一个初始化参数 savePath = config.getInitParameter("savePath"); sc = config.getServletContext(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { List items = upload.parseRequest(request); Iterator itr = items.iterator(); while (itr.hasNext()) { FileItem item = (FileItem) itr.next(); if (item.isFormField()) { System.out.println("表单参数名:" + item.getFieldName() + "，表单参数值:" + item.getString("UTF-8")); } else { if (item.getName() != null && !item.getName().equals("")) { System.out.println("上传文件的大小:" + item.getSize()); System.out.println("上传文件的类型:" + item.getContentType()); // item.getName()返回上传文件在客户端的完整路径名称 System.out.println("上传文件的名称:" + item.getName()); File tempFile = new File(item.getName()); ／／上传文件的保存路径 File file = new File(sc.getRealPath("/") + savePath, tempFile.getName()); item.write(file); request.setAttribute("upload.message", "上传文件成功！"); }else{ request.setAttribute("upload.message", "没有选择上传文件！"); } } } }catch(FileUploadException e){ e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); request.setAttribute("upload.message", "上传文件失败！"); } request.getRequestDispatcher("/uploadResult.jsp").forward(request, response); }} --------------------------------------------------------------------------------------------------
uploadResult.jsp
代码:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>uploadResult ${requestScope['upload.message'] } 上传文件
web.xml
代码：
This is the description of my J2EE component This is the display name of my J2EE component FileUploadServlet com.b510.example.FileUploadServlet ＜！--设置初始化参数--＞savePath uploads FileUploadServlet /servlet/fileServlet index.jsp uploadFile.jsp
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