Language Java Nosugar Comms Code Urlpostconnection.java

// 
//	UrlPostConnection class
//	part of the set of documents known as Java no sugar.
//	Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk
//	placed into the public domain by the author
//
// loosely based on Cgi.class written by  Jim Driscoll http://www.io.com/~maus
// functional interface tidied by sunil@magnetic.demon.co.uk
// the original had a confused fucntional interface,held onto
// sockets and streams longer than neccessary, and didnt
// return the output data.
//
// returns a document object.
//

import java.net.*;
import java.io.*;
import java.util.*;
import Document;

public class UrlPostConnection
{
	//*********************************************************************
	// Globals
	//*********************************************************************
	static final int DEFAULT_PORT = 80;
	static final String POST = "POST";
	static final boolean DEBUG = false;

	//*********************************************************************
	// instance variables
	//*********************************************************************
	protected String method = null;
	protected String host_name = null;
	protected int httpd_port = DEFAULT_PORT;
	protected String cgi_path = null;
	protected Properties properties = null;

	//*********************************************************************
	// constructors
	//*********************************************************************
	public UrlPostConnection( String hostid, String path)
	{
		this(hostid, DEFAULT_PORT, path);
	}

	//*********************************************************************
	public UrlPostConnection( String hostid, String port, String path) throws NumberFormatException
	{
		this(hostid, Integer.parseInt(port), path);
	}
	
	//*********************************************************************
	public UrlPostConnection( String hostid, int port, String path)
	{
		host_name = hostid;
		httpd_port = port;
		cgi_path = path;
		method = POST;
	}

	//*********************************************************************
	// other stuff
	//*********************************************************************
	public Document sendData() throws UnknownHostException, IOException
	{
		Socket sock = null;
		DataInputStream reply = null;
		PrintStream send = null;
		String dataString = encode_properties();
		String reply_string;
		Document output_doc;

		//--------------open the socket----------------------------------
		sock = new Socket( host_name, httpd_port );
		send = new PrintStream( sock.getOutputStream() );
		reply = new DataInputStream( sock.getInputStream() );
		
		//--------------send the data-------------------------------------
		try
		{
			send.print(method + " " + cgi_path + " HTTP/1.0\r\n");
			send.print("Content-type: application/x-www-form-urlencoded\r\n");
			send.print("Content-length: " + dataString.length() +"\r\n");
			send.print("\r\n");
			send.print(dataString);
			send.print("\r\n");
			
			//--------------get any reply-------------------------------------
			output_doc = new Document(reply);
			sock.close();
		}
		catch (IOException e)
		{
			sock.close();
			throw e;
		}
		
		//--------------close the socket----------------------------------
		
		return(output_doc);
	}
	
	//*********************************************************************
	public String toString()
	{
		return("http://" + host_name + ":" + httpd_port + cgi_path);
	}

	//*********************************************************************
	public void setProperty(String key, String value)
	{
		if (properties == null)
			properties = new Properties();
		
		properties.put(key,URLEncoder.encode(value));
	}
	
	//*********************************************************************
	public void clearProperties()
	{
		properties = null;
	}
	
	//*********************************************************************
	// private stuff
	//*********************************************************************
	private String encode_properties()
	{
		Enumeration property_names;
		String encoded = new String();
		String key, value;
		boolean first = true;

		if (properties != null)
		{
			property_names = properties.propertyNames();
				while (property_names.hasMoreElements())
			{
				if ( !first )
					encoded = encoded + "&";
				else
					first = false;
				
				key = (String)property_names.nextElement();
				value = properties.getProperty(key);
				encoded = encoded + key + "=" + value;
			}
		}

		return encoded;
	}
}

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