Web 开发实现文件上传功能

这个功能要用到一个java开元的一个jar包

用SmartUpload类做上传

//初始化上传组件

              su.initialize(config, request, response);

              //设置上传文件的大小

              //su.setMaxFileSize(1024*10*2);

             

              //设置上传文件的总大小

              //su.setTotalMaxFileSize(1024*10*10);

             

              //设置上传文件的类型

              su.setAllowedFilesList("jpg,bmp");

 

类如下：

 

package com.servlet;

 

import java.io.IOException;

import java.io.PrintWriter;

 

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import com.jspsmart.upload.File;

import com.jspsmart.upload.Files;

import com.jspsmart.upload.SmartUpload;

import com.jspsmart.upload.SmartUploadException;

 

public class UploadServlet extends HttpServlet {

 

       private ServletConfig config;

       /**

        * Constructor of the object.

        */

       public UploadServlet() {

              super();

       }

      

       @Override

       public void init(ServletConfig config) throws ServletException {

              // TODO Auto-generated method stub

              this.config = config;

       }

       public void doGet(HttpServletRequest request, HttpServletResponse response)

                     throws ServletException, IOException {

 

              doPost(request,response);

       }

 

       public void doPost(HttpServletRequest request, HttpServletResponse response)

                     throws ServletException, IOException {

              response.setContentType("text/html;charset=gbk");

              PrintWriter out = response.getWriter();

              SmartUpload su = new SmartUpload();

             

              //初始化上传组件

              su.initialize(config, request, response);

              //设置上传文件的大小

              //su.setMaxFileSize(1024*10*2);

             

              //设置上传文件的总大小

              //su.setTotalMaxFileSize(1024*10*10);

             

              //设置上传文件的类型

              su.setAllowedFilesList("jpg,bmp");

             

              int count = 0;

              try {

                     su.upload();

                     count = su.save("/upload");

                    

                     Files files = su.getFiles();

                     out.println("<table border='1'>");

                     out.println("<tr>");

                     out.println("<th>filename</th>");

                     out.println("<th>ext</th>");

                     out.println("<th>img</th>");

                     out.println("</tr>");

                     for(int i=0;i<files.getCount();i++){

                            File file = files.getFile(i);

                            out.println("<tr>");

                            out.println("<td>"+file.getFileName()+"</td>");

                            out.println("<td>"+file.getFileExt()+"</td>");

                            out.println("<td><img src='"+request.getContextPath()+"/upload/"+file.getFileName()+"'>"+"</td>");

                            out.println("</tr>");

                     }

                     out.println("</table>");

                    

              } catch (SmartUploadException e) {

                     // TODO Auto-generated catch block

                     e.printStackTrace();

              }

 

              out.println(count+"个文件上传成功！");

       }

 

}

 

 

在jsp中用下面的方法获得文件路径

<form action="servlet/UploadServlet" method="post" enctype="multipart/form-data">

一定要写上

           file1:<input type="file" name="filepath1"/><br>

           file1:<input type="file" name="filepath2"/><br>

           file1:<input type="file" name="filepath3"/><br>

           file1:<input type="file" name="filepath4"/><br>

           <input type="submit" value="upload"/>

</form>