JSP 使用smartupload上传文件，JSP+servlet

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首先创建一个用来给用户提交的jsp页面，使用表单方式对文件进行上传。

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>上传</title></head><body><form action="../UploadServlet" method="post" enctype="multipart/form-data"><input type="text" name="desc"><input type="file" name="file" ><input type="submit" value="上传"></form></body></html>

要注意，form表单一定要设置enctype属性为“mulipart/form-data”

enctype
中文意思：编码方式

然后创建一个UploadServlet用来处理文件。

package com.hu.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.jspsmart.upload.File;import com.jspsmart.upload.Request;import com.jspsmart.upload.SmartUpload;/** * Servlet implementation class UploadServlet */@WebServlet("/UploadServlet")public class UploadServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    /**     * @see HttpServlet#HttpServlet()     */    public UploadServlet() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        response.getWriter().append("Served at: ").append(request.getContextPath());    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setCharacterEncoding("utf-8");        PrintWriter out=response.getWriter();        SmartUpload mySmartUpload=new SmartUpload();        int count=0;//上传文件的数量        try {            mySmartUpload.initialize(this.getServletConfig(),request,response);            //限制每个上传文件的最大长度            mySmartUpload.setMaxFileSize(50*1024*1024);            //设置允许上传的文件格式            mySmartUpload.setAllowedFilesList("doc,txt");            mySmartUpload.upload();            //获得上传的文件            File myflie=mySmartUpload.getFiles().getFile(0);            //获得上传文件的名字            String fileName=myflie.getFileName();            //保存文件的目录            count=mySmartUpload.save("D://UPLOAD");            //获取文件的描述信息            Request req=mySmartUpload.getRequest();            String descrption=req.getParameter("desc");            out.println(count+"files uploaded<br>");            out.println("file descrption:"+descrption);        } catch (Exception e) {            out.print("Unable to upload file");            out.println(e.toString());        }    }}

这里需要说明一下，使用SmartUpload需要加载驱动，驱动文件可以去CSDN下载，搜索jspsmartupload.jar。下载好驱动后，放在web-inf文件下的lib文件中，右键点击驱动，选择add to…（这一步可以省略）

上传的文件最好不要放在工程中，可以放在其他磁盘中。

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