sendget.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 6
public class SendGET 
{
	public static void main(String args[]) throws IOException
	{
		// Check command line parameters
		if (args.length < 1)
		{
			System.out.println ("Syntax-  SendGET baseurl");
			System.in.read();
			return;
		}

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

		// Start with a ? for the query string
		String arguments = "?";

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

		// 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();

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

		// Construct the full GET request
		String finalURL = baseURL + arguments;

		System.out.println ("Sending GET request - " + finalURL);

		// Send the GET request, and display output
		try
		{
			// Construct the url object
			URL url = new URL(finalURL);

			// Open a connection
			InputStream input = url.openStream();

			// 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 - " + finalURL);
		}
		catch (IOException ioe)
		{
			System.err.println ("I/O error " + ioe);
		}
	}
}