httpexample_2.java

《精通JAVA手机游戏与应用程序设计》随书光盘

import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;

/*
 * 获得指定网页的数据
 */

public class HttpExample_2 extends MIDlet implements CommandListener {

	private Command exitCommand;

	private TextBox tb;

	String url = "http://127.0.0.1:8080/HelloWorld.html";

	public HttpExample_2() {
		exitCommand = new Command("Exit", Command.EXIT, 1);
		tb = new TextBox("HttpConnectiont例子", "", 200, 0);
		tb.addCommand(exitCommand);
		tb.setCommandListener(this);
	}

	protected void startApp() {
		try {
			HttpConnection c = null;
			InputStream s = null;
			StringBuffer b = new StringBuffer();
			try {
				long len = 0;
				int ch = 0;
				c = (HttpConnection) Connector.open(url);
				s = c.openInputStream();
				len = c.getLength();
				if (len != -1) {
					// Read exactly Content-Length bytes
					for (int i = 0; i < len; i++)
						if ((ch = s.read()) != -1) {
							b.append((char) ch);
						} else {

							//读取数据，直到网络断开为止.
							while ((ch = s.read()) != -1) {
								len = s.available();
								b.append((char) ch);
							}

						}
				}
			} finally {
				s.close();
				c.close();
			}

			tb.setString(b.toString());
			Display.getDisplay(this).setCurrent(tb);

		} catch (Exception e) {
			System.out.println("error");
			e.printStackTrace();

		}

	}

	protected void pauseApp() {
	}

	protected void destroyApp(boolean d) {

	}

	public void commandAction(Command c, Displayable d) {
		if (c == exitCommand) {

			destroyApp(false);
			notifyDestroyed();
		}

	}

}