使用JAVA技术实现文件的上传

作者：ztyzty

下面是一个用来上传下达的小程序,希望大家给予指教.

import java.io.*;
import java.util.*;
import java.text.*;
import javax.mail.*;
import javax.servlet.*;
import javax.activation.*;
import javax.servlet.http.*;
import javax.mail.internet.*;
import javax.mail.internet.MimeMultipart;

/**
*  @author   2002/7/10 zty
*
*<p>
*<p> 【使用例】
*<p>　　try {
*<p>　　　　Upload load=new Upload();
*<p>　　　　load.setDir("i:\\ztytest\\");　　　　 *<p>　　　　load.doUpload(req,res);　      　　　 *<p>                                                 //HttpServletRequest req
*<p>                                                 //HttpServletResponse res
*<p>　　}
*<p>　　catch( Exception e ) {
*<p>　　　　return;
*<p>　　}
*/

public class Upload extends HttpServlet {
    public String strDir;

    public Upload()
    {
    }

    public void doUpload(HttpServletRequest req, HttpServletResponse res)
        throws IOException,MessagingException
    {
      String boundary=req.getHeader("Content-Type");
      int pos=boundary.indexOf(''='');
      boundary=boundary.substring(pos+1);
      boundary="--"+ boundary;
      ServletInputStream in=req.getInputStream() ;
      byte bytes=new byte[512];
      int state=0;
      ByteArrayOutputStream buffer=new ByteArrayOutputStream();
      String name=null;
      String value=null;
      String filename=null;
      String contentType=null;

      int i=in.readLine(bytes,0,512);

      while (-1!=i)
      {
        String st=new String(bytes,0,i);
        if (st.startsWith(boundary))
        {
            state=0;
   &