jsp上传文件时读取文件出错

request.getInputStream();
你真有趣，在jsp里面还想处理输入流？

upfile.jsp<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.io.*" %>
<html>
<body>
   <%     String tempfilename=(String)session.getId();
          File f1=new File("D:\\JAVA\\Tomcat\\webapps\\fileup",tempfilename);
          int n;
          try
          {
              InputStream in=request.getInputStream();
              BufferedInputStream my_in=new BufferedInputStream(in);
              FileOutputStream fout=new FileOutputStream(f1);
              BufferedOutputStream my_out=new BufferedOutputStream(fout);
              byte[] b=new byte[10000];
              while((n=my_in.read(b))!=-1)
              {
                   my_out.write(b,0,n);
              }
              my_out.flush();
              my_out.close();
              fout.close();
              my_in.close();
              in.close();
              out.print("文件上传成功!<br>");
          }
          catch(IOException e)
          {
              out.print("文件上传失败!");
          }

          try
          {
              RandomAccessFile random1=new RandomAccessFile(f1,"r");
              random1.readLine();
              String filename=random1.readLine();
              byte[] b=filename.getBytes("ISO-8859-1");
              filename=new String(b);
              int pointer=filename.lastIndexOf('\\');
              filename=filename.substring(pointer+1,filename.length()-1);
              File f2=new File("J:\\Tomcat 5.5\\webapps\\ROOT\\test",filename);
              RandomAccessFile random2=new RandomAccessFile(f2,"rw");
              random1.seek(0);
              for(int i=1; i<=4; i++)
              {
                   String tempstr=random1.readLine();
              }
              long startPoint=random1.getFilePointer();
              random1.seek(random1.length());
              long =random1.getFilePointer();
              int j=0;
              long endPoint=0;
              while((>=0)&&(j<=5))
              {
                   --;
                   random1.seek();
                   n=random1.readByte();
                   if(n=='\n')
                   {
                         j++;
                         endPoint=random1.getFilePointer();
                   }
              }
              long length=endPoint-startPoint+1;
              int order=(int)(length/10000);
              int left=(int)(length%10000);
              byte[] c=new byte[10000];
              random1.seek(startPoint);
              for(int i=0; i<order; i++)
              {
                    random1.read(c);
                    random2.write(c);
              }
              random1.read(c,0,left);
              random2.write(c,0,left);
              random1.close();
              random2.close();
              f1.delete();
              out.print("文件更新成功!");
          }
          catch(Exception e)
          {
              out.print("文件更新失败!");
          }
   %>
</body>
</html>

uploadBean.java/*
* Created on 2009-8-8
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package MyBean;/**
* @author innolux_08
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/import  java.io.*;
import javax.servlet.http.HttpServletRequest;
public class uploadBean {
public void doUpload(HttpServletRequest request) throws
     IOException {
          //String filename=(String)session.getId();
          File tempf=new File("D:\\JAVA\\Tomcat\\webapps\\fileup","2");
          int n;
          try
          {
              InputStream in=request.getInputStream();
              BufferedInputStream my_in=new BufferedInputStream(in);
              FileOutputStream fout=new FileOutputStream(tempf);
              BufferedOutputStream my_out=new BufferedOutputStream(fout);
              byte[] b=new byte[10000];
              while((n=my_in.read(b))!=-1)
              {
                   my_out.write(b,0,n);
              }
              my_out.flush();
              my_out.close();
              fout.close();
              my_in.close();
              in.close();
              //out.print("文件上传成功!<br>");
          }
          catch(IOException e)
          {
              //out.print("文件上传失败!");
          }
}}

http://download.csdn.net/source/1532774
上面有完整的例子

楼主你这个代码也叫上传文件啊
网页中上传文件的时候HttpInputStream 里有HTTP请求头的信息，和文件的内容
并不只有单一的文件内容，所以你要在服务器段对HttpInputStream 进行解析才能
获取到文件的内容
楼主你就直接用那个cos 上传文件的组件包就可以了
顺便可以看看里面的源代码

调试易

jsp上传文件时读取文件出错

解决方案 »