sendpost.java

Java网络编程与分布式计算, 主要分析java网络各方面的编程, 提供许多实用安全

import java.net.*;
import java.io.*;

// Chapter 9, Listing 7
public class SendPOST 
{
	public static void main(String args[]) throws IOException
	{
		// Check command line parameters
		if (args.length < 1)
		{
			System.out.println ("Syntax-  SendPOST baseurl");
			System.in.read();
			return;
		}

		// Get the base URL of the cgi-script/servlet
		String baseURL = args[0];

		// No query string question mark required, so use
		// a blank string
		String arguments = "";

		// Create a buffered reader, for reading CGI 
		// parameters from the user
		BufferedReader reader = new BufferedReader (
			new InputStreamReader ( System.in )
		  );


		boolean firstParameter = true;

		// Loop until no parameters left
		for (;;)
		{
			System.out.println ("Enter field ( . terminates )");

			String field = reader.readLine();

			// If a . char entered, terminate loop
			if (field.equals ("."))
				break;

			System.out.println ("Enter value");

			String value = reader.readLine();

			if (!firstParameter)
				arguments += "&";
			else
				firstParameter = false;

			// Encode the URL value
			arguments += URLEncoder.encode(field)
				 + "=" + URLEncoder.encode(value);			
		}

		String query = arguments;

		System.out.println ("Sending POST request - " + query);

		// Send the POST request, and display output
		try
		{
			// Construct the url object representing cgi script
			URL url = new URL( baseURL );

			// Get a URLConnection object, to write to POST method
			URLConnection connect = url.openConnection();

			// Specify connection settings
			connect.setDoInput(true);
			connect.setDoOutput(true);
   
			// Get an output stream for writing
			OutputStream output = connect.getOutputStream();

			// Create a print stream, for easy writing
//			PrintWriter writer = new PrintWriter ( new OutputStreamWriter ( output ) );
//			writer.print ( query );
//			writer.close();
			PrintStream pout = new PrintStream (output);

			pout.print ( query );
			pout.close();

			// Open a connection
			InputStream input = connect.getInputStream();

			// Buffer the stream, for better performance
			BufferedInputStream bufIn = new BufferedInputStream(input);

			// Repeat until end of file
			for (;;)
			{
				int data = bufIn.read();

				// Check for EOF
				if (data == -1)
					break;
				else
					System.out.print ( (char) data);
			}

			// Pause for user
			System.out.println ();
			System.out.println ("Hit enter to continue");
			System.in.read();

		}
		catch (MalformedURLException mue)
		{
			System.err.println ("Bad URL - " + baseURL);
		}
		catch (IOException ioe)
		{
			System.err.println ("I/O error " + ioe);
		}
	}
}