Dear All,
I've already modified my program based on Mr. Christopher's solution but
thers's still the word "null" in the file.
You probably have a null content variable. String.valueOf(null) returns
"null", so that's probably what's happening.
I only declared URL servletUrl = null but now I already commented it.
For your information, the purpose of my program is ONLY to save information
from the client to the server. I don't intend to send back information from the
server to the client.
My complete program looks like this now after the suggested modification
(ClientIdea.java, ServerIdea.java, ClientIdea.html not included):
// C:\jakarta-tomcat-4.1.31\webapps\ROOT\ClientIdea.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JApplet;
import javax.swing.text.BadLocationException;
import java.net.*;
import java.io.*;
import java.util.*;
public class ClientIdea extends JApplet implements ItemListener,
ActionListener
{
JPanel panel1, panellabel, panelbutton, paneltext;
JTextField namefile;
JButton jbtSave;
JTextArea textEditor;
JLabel labelfile;
public void init()
{
Container container = getContentPane();
namefile = new JTextField(10);
panel1 = new JPanel();
panellabel = new JPanel();
panelbutton = new JPanel();
paneltext = new JPanel();
labelfile = new JLabel("File Name");
panellabel.setLayout(new FlowLayout(FlowLayout.LEFT,50,0));
panellabel.add(labelfile);
panellabel.add(namefile);
panelbutton.setLayout(new GridLayout(1,1));
panelbutton.add(jbtSave = new JButton("Save"));
textEditor = new JTextArea(18,63);
textEditor.setFont(new Font("monospaced",Font.PLAIN,12));
JScrollPane scrollPane1 = new JScrollPane(textEditor);
Linenumber linenumber1 = new Linenumber ( textEditor );
scrollPane1.setRowHeaderView(linenumber1);
paneltext.add(scrollPane1);
panel1.add(panellabel);
panel1.add(paneltext);
panel1.add(panelbutton);
container.add(panel1);
jbtSave.addActionListener (
new ActionListener() {
public void actionPerformed (ActionEvent en) {
savefile();
}
}
);
} // end init
public void actionPerformed(ActionEvent ae)
{
} // End action perform
public void itemStateChanged(ItemEvent ie)
{
} // End item state changed
public void savefile()
{
String filename = namefile.getText();
String teditor = textEditor.getText();
//URL servletUrl = null;
URL servletUrl;
URLConnection con;
String servletName = http://localhost:8080/examples/servlet/ServerIdea;
try
{
servletUrl = new URL(servletName + "?filename=" + filename);
con = servletUrl.openConnection();
con.setDoOutput(true);
con.setRequestProperty("Content-Type","text/plain;charset=UTF-8");
con.connect();
OutputStreamWriter out = new
OutputStreamWriter(con.getOutputStream(),"UTF-8");
out.write(teditor, 0, teditor.length());
out.flush();
out.close();
DataInputStream in = new DataInputStream(con.getInputStream());
in.close();
}
catch(Exception e)
{
System.out.println("Exception caught..."+e);
}
} // end savefile
} // end class ClientIdea
// C:\jakarta-tomcat-4.1.31\webapps\examples\WEB-INF\classes\ServletIdea.java
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServerIdea extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res) throws
IOException, ServletException
{
String name = req.getParameter("filename");
String content = req.getParameter("teditor");
PrintWriter outFile = new PrintWriter(new OutputStreamWriter(new
FileOutputStream("C:/temp/"+name)));
outFile.println(content);
outFile.close();
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws
IOException, ServletException {
doGet(req, res);
}
}
Did I miss out anything? Please help me! Thank you.
Yours Sincerely,
TEH NORANIS
Christopher Schultz <[EMAIL PROTECTED]> wrote:
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Teh,
Teh Noranis Mohd Aris wrote:
> Now, a file name that was input by the user
> was created BUT the problem is that, when I open the file, the word
> "null" was written to the file NOT the file content.
You probably have a null content variable. String.valueOf(null) returns
"null", so that's probably what's happening.
> The filename
> parameter was sent from the applet to the servlet BUT the file
> content parameter was not sent.
You're going to want to fix that.
> This means that the file content
> parameter does not exist and the servlet did not receive the file
> content parameter!
Sounds about right. If I were you, I would modify my program to do
nothing if there's no file content parameter. (Well, I would actually
use PUT and place the content in the body of the request, but...).
> servletUrl = new URL(servletName + "?filename=" + filename);
> con = servletUrl.openConnection();
> con.setDoOutput(true);
> con.connect();
So far so good.
> ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
> DataOutputStream out = new DataOutputStream(byteOut);
> out.writeUTF(teditor);
> out.flush();
> out.close();
Uhh... you put your data into a ByteArrayOutputStream and then did
nothing with it at all. You need to write it to the URLConnection's
OutputStream:
If you are going to be using UTF, you need to specify that when
connecting to your server so it knows what character set you are using.
Use the "Content-Type" header for this:
con.setRequestProperty("Content-Type", "text/plain; charset=UTF-8");
DataOutputStream uses "modified" UTF-8, and is actually intended to be
used with Java object serialization. Don't do this. Instead, use real
UTF-8 like this:
Instead of the above, do this:
OutputStreamWriter out
= new OutputStreamWriter(con.getOutputStream(), "UTF-8"));
out.write(teditor, 0, teditor.length());
out.flush();
out.close();
> DataInputStream in = new DataInputStream(con.getInputStream());
> in.close();
To be correct, you ought to empty this inputstream before closing it.
Also, if you ever hope to use non-text data, you should change your
content type to "application/octet-stream" with no encoding at all (the
encoding is basically "raw"). You'll also want to write bytes instead of
Strings to your output stream and get rid of the OutputStreamWriter.
- -chris
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