URL Programming Demo__url Network programming

This demo is premised on creating a new HelloWorld.txt under the WebApps Example folder of the Tomcat server. and writes a write content

Package Mynetdemo;

Import static org.junit.assert.*;
Import Java.io.File;
Import java.io.FileNotFoundException;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.OutputStream;
Import java.net.MalformedURLException;
Import Java.net.URL;

Import java.net.URLConnection;

Import Org.junit.Test;  public class Testurl {//URL Uniform Resource Locator, a URL object that corresponds to a resource on the Internet/can invoke its corresponding method through the URL object to read this resource to public static void main (string[]
		args) {//Create a URL object URL url = null;
		How to read the resources in the server side: OpenStream () InputStream iStream = null;
		int Len;

			try {url = new URL ("Http://127.0.0.1:8080/examples/HelloWorld.txt?a=b");
			 * * * SYSTEM.OUT.PRINTLN (Url.getprotocol ());
			 * SYSTEM.OUT.PRINTLN (Url.gethost ());
			 * SYSTEM.OUT.PRINTLN (Url.getport ());
			 * SYSTEM.OUT.PRINTLN (Url.getpath ()); * SYSTEM.OUT.PRINTLN (Url.getfile ());//url filename * SYSTEM.OUT.PRINTLN (Url.getref ());//Get the relative position of the URL in the file * System.out.prin TLN (Url.getquery ()//Get URL query name * * IStream = Url.openstream ();
			Byte[] B = new BYTE[20];
				while (len = Istream.read (b))!=-1) {string string = new String (b, 0, Len);
			System.out.println (string);
		} catch (Malformedurlexception E1) {//TODO auto-generated catch block E1.printstacktrace ();
		catch (IOException E1) {//TODO auto-generated catch block E1.printstacktrace ();
				finally {if (IStream!= null) {try {istream.close ();
				catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();
		To read in the resource and want to write out resources,: urlconnection inputstream is = null;
		FileOutputStream fos = null;
			try {url = new URL ("Http://127.0.0.1:8080/examples/HelloWorld.txt?a=b");
			URLConnection connection = Url.openconnection ();
			is = Connection.getinputstream ();

			FOS = new FileOutputStream (New File ("Out1.txt"));
			Byte[] B1 = new BYTE[20];
			int len1; while ((Len1 = Is.read (B1))!=-1) {Fos.write (B1, 0, leN1);
		} catch (FileNotFoundException E1) {//TODO auto-generated catch block E1.printstacktrace ();
		catch (IOException E1) {//TODO auto-generated catch block E1.printstacktrace ();
				finally {if (FOS!= null) {try {fos.close ();
				catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();
				} if (is!= null) {try {is.close ();
				catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();
 }

			}
		}
	}

}