怎么在jsp页面实现文件上传呢

楼主试试这个控件：http://www.cnblogs.com/xproer/archive/2010/10/24/1859895.html
此控件是基于标准HTTP协议实现的文件上传功能。优势是扩展性非常好，整合简单，支持批量上传文件和上传文件夹功能，上传前获取本地文件大小，适合各种简单WEB项目。
另外一个特点是支持自动上传指定的本地文件。单文件上传演示上传本地文件代码
使用步骤如下：
1.调用AddFile函数添加本地文件，注意路径需要使用双斜框(\\)
2.调用PostFirst函数开始上传文件。<script type="text/javascript" language="javascript">
     var fileMgr = new HttpUploaderMgr();
     fileMgr.Load();//加载控件 window.onload = function()
{
fileMgr.Init();//初始化控件
//添加一个本地文件
fileMgr.AddFile("D:\\Soft\\QQ2010.exe");
fileMgr.PostFirst(); };
</script>
获取本地文件大小服务器返回消息：<input id="txtFilePath" type="text" size="50" />
<script type="text/javascript" language="javascript">
var fileMgr = new HttpUploaderSingleMgr();
fileMgr.Config["PostUrl"] = "http://localhost:8080/asp.net/upload.aspx";//指定文件上传地址，可以在这里设置文件服务器地址
fileMgr.Load();
function testFileSize()
{
    var obj = new ActiveXObject(fileMgr.ActiveX["Partition"]);
    alert(obj.FileSize("D:\\VS2012.SP4.iso"));
} function testFileLength()
{
    var obj = new ActiveXObject(fileMgr.ActiveX["Partition"]);
    alert(obj.FileLength("D:\\VS2012.SP4.iso"));
}
</script>
单文件整合代码：服务器返回消息：<input id="txtFilePath" type="text" size="50" />
<script type="text/javascript" language="javascript">
var fileMgr = new HttpUploaderSingleMgr();
fileMgr.Config["PostUrl"] = "http://localhost:8080/asp.net/upload.aspx";//指定文件上传地址，可以在这里设置文件服务器地址
fileMgr.Load();
//文件上传完成后执行的回调函数
fileMgr.CompleteHook = function(msg)
{
document.getElementById("txtFilePath").value = msg;
}; window.onload = function()
{
fileMgr.Init();
};
</script>示例下载：
cab安装包(x86)
cab安装包(x64)
xpi安装包
 crx安装包
 exe安装包
 开发文档
 ASP示例
 ASP.NET示例
 JSP示例
 PHP示例
upload.jsp代码；<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>using commons Upload to upload file </title>
</head>
<style>
* { font-family: "宋体"; font-size: 14px }
</style>
<body>
<p align="center"> 请您选择需要上传的文件</p>
<form id="form1" name="form1" method="post" action="servlet/fileServlet" enctype="multipart/form-data">
<table border="0" align="center">
  <tr>
   <td>上传人：</td>
   <td>
    <input name="name" type="text" id="name" size="20" ></td>
  </tr>
  <tr>
   <td>上传文件：</td>
   <td><input name="file" type="file" size="20" ></td>
  </tr>
  <tr>
   <td></td><td>
    <input type="submit" name="submit" value="提交" >
    <input type="reset" name="reset" value="重置" >
   </td>
  </tr>
</table>
</form>
</body>
</html>--------------------------------------------------------------------------------------------------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"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>

    <title>uploadResult</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
  ${requestScope['upload.message'] }
    <a href="/upload/uploadFile.jsp">上传文件</a>
  </body>
</html>--------------------------------------------------------------------------------------------------web.xml代码：<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>FileUploadServlet</servlet-name>
    <servlet-class>com.b510.example.FileUploadServlet</servlet-class>　　＜！--设置初始化参数--＞
    <init-param>
     <param-name>savePath</param-name>
     <param-value>uploads</param-value>
    </init-param>
  </servlet>  <servlet-mapping>
    <servlet-name>FileUploadServlet</servlet-name>
    <url-pattern>/servlet/fileServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
    <welcome-file>uploadFile.jsp</welcome-file>
  </welcome-file-list>
</web-app>
如果是指定路径的话，就只能用控件来实现。如果让用户选择的话就用input[type=file]。楼上朋友推荐的Xproer.HttpUploader2不错。看起来挻强大的。我们公司做的一个项目也有这个需求，打算换这个控件来试试。

调试易

怎么在jsp页面实现文件上传呢

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