Applet > servlet file transfer

[milkman128]

I am trying to get an applet to transfer files to a servlet. My problem is getting the applet to pass the information to the servlet

I am using resin as a container
applet servlet code below



Applet code


import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class FileUploadApplet extends JApplet implements ActionListener
{

JButton jbutton = null;
public void init()
{
jbutton = new JButton("Send file");
jbutton.addActionListener(this);
this.getContentPane().add(jbutton);
}

public void actionPerformed(ActionEvent ae)
{
if(ae.getSource() == jbutton)
{
try
{
File file = new File("C:\\NewToledo.txt");

FileInputStream in = new FileInputStream(file);
byte[] buf=new byte[in.available()];
int bytesread = 0;

String toservlet = "localhost8080/test/etc..";

URL servleturl = new URL(toservlet);
URLConnection servletconnection = servleturl.openConnection();
servletconnection.setDoInput(true);
servletconnection.setDoOutput(true);
servletconnection.setUseCaches(false);
servletconnection.setDefaultUseCaches(false);

DataOutputStream out = new DataOutputStream(servletconnection.getOutputStream ());

while( (bytesread = in.read( buf )) > -1 )
{
out.write( buf, 0, bytesread );
}

out.flush();
out.close();
in.close();

DataInputStream inputFromClient = new DataInputStream(servletconnection.getInputStream() );
//get what you want from servlet
//.......
inputFromClient.close();
}
catch(Exception e)
{
e.printStackTrace();
}

}
}

}

-------------------------------------------------------------------
Servlet code


package test;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class FileUpload extends HttpServlet
{
public void doPost(HttpServletRequest req,HttpServletResponse res)
{

ServletContext sc = this.getServletContext();
try
{
String fileName = "C:\\NewToledo.txt";
String path = fileName;

File yourFile = new File(path);
FileOutputStream toFile = new FileOutputStream( yourFile );
DataInputStream fromClient = new DataInputStream( req.getInputStream() );

byte[] buff = new byte[1024];
int cnt = 0;
while( (cnt = fromClient.read( buff )) > -1 ) {
toFile.write( buff, 0, cnt );
}
toFile.flush();
toFile.close();
fromClient.close();

}
catch(Exception e)
{
e.printStackTrace();
}
}
}





here is the log info from resin

Http[13] POST /servlet/MyServlet HTTP/1.1
Http[13] Remote-IP: 127.0.0.1:3828
Http[13] Cache-Control: no-cache
Http[13] Pragma: no-cache
Http[13] User-Agent: Mozilla/4.0 (Windows XP 5.1) Java/1.6.0_07
Host: localhost:8080
Http[13] Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Http[13] Connection: keep-alive
Http[13] Content-type: application/x-www-form-urlencoded
Http[13] Content-Length: 20311
Http[13] HTTP/1.1 404 Not Found
Http[13] Content-Type: text/html; charset=utf-8
Http[13] Transfer-Encoding: chunked
Http[13] write-chunk(184)
Http[13] write-chunk(7)
Http[13] finish/keepalive
Http[13] keepalive


It appears to grab the content just not connect or pass content. I have tried to define the URL via multiple file separators no luck.

any suggestions thanks for your time.

[Nicholas Jordan]

...My problem is getting the applet to pass the information to the servlet.

Me too.

I have tried to define the URL via multiple file separators

What does this mean?

import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class FileUploadApplet extends JApplet implements ActionListener
{
    // 
    JButton jbutton = null;
    public void init()
    {
        jbutton = new JButton("Send file");
        jbutton.addActionListener(this);
        this.getContentPane().add(jbutton);
    }
    //
    public void actionPerformed(ActionEvent ae)
    {
        if(ae.getSource() == jbutton)
        {
            try
            {
                FileInputStream in = new File("C:\\NewToledo.txt");
                byte[] buf=new byte[in.available()];
                int bytesread = 0;
                // meaningless string for posting...
                String toservlet = "..........";
                //
                URL servleturl = new URL(toservlet);
                URLConnection servletconnection = servleturl.openConnection();
                /**
                * The default value of this field is <code>true</code>. 
                */
                servletconnection.setDoInput(true);
                /**
                * The default value of this field is <code>false</code>. 
                */
                servletconnection.setDoOutput(true);
                if(servletconnection.getAllowUserInteraction())
                {
                    servletconnection.setAllowUserInteraction(true);
                }
                servletconnection.setUseCaches(false);
                servletconnection.setDefaultUseCaches(false);
                //
                DataOutputStream out = new DataOutputStream(servletconnection.getOutputStream());
                //
                while( (bytesread = in.read( buf )) > -1 )
                {
                    // Writes the specified byte (the low eight bits of the argument b) to the underlying output stream.
                    out.write(bytesread);
                }
                //
                out.flush();
                out.close();
                in.close();
                //...deletions for posting.
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }
}

Mods to file read, see docs for DataOutputStream