-eck-
asked on
Problems with simple Java Based HTTP-SocketServer
Greetings everybody,
I'm trying to build a simple HTTP-SocketServer in Java. The very basic idea of the program is to listen for HTTP-Requests, stream-in the Request, and send back a HTTP-Response.
The Code:
package httpconnection;
import java.io.*;
import java.net.*;
public class Main {
/** Creates a new instance of Main */
public Main() {
}
public static void main(String[] args) {
try
{
ServerSocket lServerSocket = new ServerSocket( 9999, 0, InetAddress.getByName( "127.0.0.1" ) );
Socket lSocket = lServerSocket.accept();
InputStream lInputStream = lSocket.getInputStream();
BufferedReader lBufferedReader = new BufferedReader( new InputStreamReader( lInputStream ) );
String lStrHTTPrequest = "";
int lIntCharacterReadFromReque
String lStrHTTPrequestHeaderLine = "";
String lStrAllHTTPrequestHeaders = "";
while ( ( lIntCharacterReadFromReque
{
System.out.print( ( char )lIntCharacterReadFromRequ
}
String lStrResponse = "HTTP/1.1 302 Found\n" +
"Content-Type: text/html\n" +
"Server: GlobalCHatServer 0.01 alpha\n" +
"Transfer-Encoding: chunked\n" +
"Content-Type: text/html\n" +
"\n" +
"<HTML><HEAD></HEAD><BODY>
OutputStream lOutputStream = lSocket.getOutputStream();
lOutputStream.write(lStrRe
lSocket.close();
lSocket = null;
}
catch(IOException ex)
{
ex.printStackTrace();
}
}
}
The Code itself compiled perfectly, and was able to cath and print out the HTTP-Request. For some reason, the program was halted at the while-loop, and no response is sent back to the client. There is also no Error-Message is printed out in the console.
Should we put the response lines output before the while-loop, clients could perfectly recieve the wanted response-header.
and I can't figure out why the program halted in the while loop, Any suggestions please?
Thanks a lot in advance,
-eck-
I'm trying to build a simple HTTP-SocketServer in Java. The very basic idea of the program is to listen for HTTP-Requests, stream-in the Request, and send back a HTTP-Response.
The Code:
package httpconnection;
import java.io.*;
import java.net.*;
public class Main {
/** Creates a new instance of Main */
public Main() {
}
public static void main(String[] args) {
try
{
ServerSocket lServerSocket = new ServerSocket( 9999, 0, InetAddress.getByName( "127.0.0.1" ) );
Socket lSocket = lServerSocket.accept();
InputStream lInputStream = lSocket.getInputStream();
BufferedReader lBufferedReader = new BufferedReader( new InputStreamReader( lInputStream ) );
String lStrHTTPrequest = "";
int lIntCharacterReadFromReque
String lStrHTTPrequestHeaderLine = "";
String lStrAllHTTPrequestHeaders = "";
while ( ( lIntCharacterReadFromReque
{
System.out.print( ( char )lIntCharacterReadFromRequ
}
String lStrResponse = "HTTP/1.1 302 Found\n" +
"Content-Type: text/html\n" +
"Server: GlobalCHatServer 0.01 alpha\n" +
"Transfer-Encoding: chunked\n" +
"Content-Type: text/html\n" +
"\n" +
"<HTML><HEAD></HEAD><BODY>
OutputStream lOutputStream = lSocket.getOutputStream();
lOutputStream.write(lStrRe
lSocket.close();
lSocket = null;
}
catch(IOException ex)
{
ex.printStackTrace();
}
}
}
The Code itself compiled perfectly, and was able to cath and print out the HTTP-Request. For some reason, the program was halted at the while-loop, and no response is sent back to the client. There is also no Error-Message is printed out in the console.
Should we put the response lines output before the while-loop, clients could perfectly recieve the wanted response-header.
and I can't figure out why the program halted in the while loop, Any suggestions please?
Thanks a lot in advance,
-eck-
SOLUTION
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ASKER CERTIFIED SOLUTION
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Once you get a connection in accept (), you should ideally let another thread handle that client:
https://www.experts-exchange.com/questions/21757720/Is-there-any-sample-online-for-socket-and-multi-thread.html#16084277
https://www.experts-exchange.com/questions/21757720/Is-there-any-sample-online-for-socket-and-multi-thread.html#16084277
Hi -eck-,
>> ServerSocket lServerSocket = new ServerSocket( 9999, 0, InetAddress.getByName( "127.0.0.1" ) );
you may need backlog > 0 :
ServerSocket lServerSocket = new ServerSocket( 9999, 50, InetAddress.getByName( "127.0.0.1" ) );
and loop to answer multiple requests:
for(;;)
{
Socket lSocket = lServerSocket.accept();
try{
...
} catch(IOException ioex){}
finally { lSocket.close(); }
}
>> ServerSocket lServerSocket = new ServerSocket( 9999, 0, InetAddress.getByName( "127.0.0.1" ) );
you may need backlog > 0 :
ServerSocket lServerSocket = new ServerSocket( 9999, 50, InetAddress.getByName( "127.0.0.1" ) );
and loop to answer multiple requests:
for(;;)
{
Socket lSocket = lServerSocket.accept();
try{
...
} catch(IOException ioex){}
finally { lSocket.close(); }
}
You also need to use \r\n instead of \n, and specify content-length (HTTP 1.1) :
String lStrResponse = "HTTP/1.1 302 Found\r\n" +
"Content-Type: text/html\r\n" +
"Server: GlobalCHatServer 0.01 alpha\r\n" +
"Connection: close\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: 59\r\n" +
"\r\n" +
"<HTML><HEAD></HEAD><BODY>
String lStrResponse = "HTTP/1.1 302 Found\r\n" +
"Content-Type: text/html\r\n" +
"Server: GlobalCHatServer 0.01 alpha\r\n" +
"Connection: close\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: 59\r\n" +
"\r\n" +
"<HTML><HEAD></HEAD><BODY>
and :
lOutputStream.flush(); // just before closing the socket
lOutputStream.flush(); // just before closing the socket
SOLUTION
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ASKER
Hi all,
thanks a lot for the reat replies, I'm trying to replace the old while loop with this argument:
while ((lStrLineReadFromRequest = lBufferedReader.readLine()
{
System.out.println( lStrLineReadFromRequest );
}
Of course, I've replaced all the local variables to meet up the need, the problem is, I don't know, what we should use in place of "End_Of_Request_String", I've tried "\r" "\n" "\r\n" "null" and all of them don't work, any suggestions?
Also, thanks a lot for the "\r\n" tip :-)
-eck-
thanks a lot for the reat replies, I'm trying to replace the old while loop with this argument:
while ((lStrLineReadFromRequest = lBufferedReader.readLine()
{
System.out.println( lStrLineReadFromRequest );
}
Of course, I've replaced all the local variables to meet up the need, the problem is, I don't know, what we should use in place of "End_Of_Request_String", I've tried "\r" "\n" "\r\n" "null" and all of them don't work, any suggestions?
Also, thanks a lot for the "\r\n" tip :-)
-eck-
SOLUTION
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ASKER
Wow, okay, problem solved. Thanks a lot again guys for the help :-)
-eck-
-eck-
no worries :)
>> Also, thanks a lot for the "\r\n" tip :-)
but no points ...
but no points ...
this will block until the streamm is closed.
and it won't get closed until you send the response.