java如何上传文件

1---jsp页面

<body>
     <p align="center">上传文件选择</p>
     <form action="DoUploadServlet" method="post" enctype="multipart/form-data">
         <table width="%75" border="1" align="center">
             <tr>
                 <td><div align="center">
                       1.<input type="FILE" name="FILE1" size="30">
                 </div></td>
             </tr>

              <tr>
                 <td><div align="center">
                      <input type="submit" name="submit" value="上传它！">
                 </div></td>
             </tr>
         </table>
     </form>
</body>

2.--servlet

      package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;

import com.jspsmart.upload.File;
import com.jspsmart.upload.Files;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class DoUploadServlet extends HttpServlet {

   @Override
   protected void service(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {

       response.setContentType("text/html;charset=GB2312");
       PrintWriter out=response.getWriter();

       //新建一个smartupload对象
        SmartUpload su=new SmartUpload();
        //得到pagecontext对象
        PageContext pagecontext=JspFactory.getDefaultFactory().getPageContext(this, request, response, null, true, 8129, true);
        //上传初始化
        su.initialize(pagecontext);
        //上传文件
        try {
           //限制上传的后缀名
           su.setAllowedFilesList("txt,jpg,html");
           su.upload();
            //上传路径
           su.save("e://share");
           //判断文件是否存在
           Files fs=su.getFiles();//得到所有文件的集合
           for(int i=0;i<fs.getCount();i++){
               File file=fs.getFile(i);//得到上传文件的信息
               //判断文件后缀名
               if(file.getFileExt().equals("jpg"))
               {
                   //判断是否存在
                   //如果返回false-->表示存在返回true-->表示不存在
                   if(!file.isMissing()){
                       System.out.println("上传成功");
                       file.saveAs("e://share/"+System.currentTimeMillis()+file.getFileName());

                   }
               }
               else{
                   System.out.println("你上传的文件有误,后缀名必须是jpg");
               }
           }

       } catch (SmartUploadException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }

}

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