newsframe.java

这是一个可以在手机客户端运行的选课系统 这个是服务器端

/*
 * 创建日期 2005-3-26
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */

/**
 * @author huihui
 * 
 * TODO 要更改此生成的类型注释的模板，请转至 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.*;

public class NewsFrame implements CommandListener {

	private List categorylist = new List("信息类别", Choice.IMPLICIT);

	private String[] category = null;

	private int categoryNum = 0;

	private List titlelist = null;

	private String[][] title = null;

	private int[][] titleID = null;

	private TextBox detail = null;

	private MainMIDlet mainmidlet = null;

	private String content = null;

	public NewsFrame(MainMIDlet mainmidlet) {
		this.mainmidlet = mainmidlet;
	}

	public void commandAction(Command c, Displayable d) {
		String label = c.getLabel();
		if (label.equals("返回")) {
			if (this.mainmidlet.display.getCurrent().equals(categorylist)) {
				this.mainmidlet.ShowMain();
			} else if (this.mainmidlet.display.getCurrent().equals(titlelist)) {
				this.mainmidlet.ShowCategory();
			} else if (this.mainmidlet.display.getCurrent().equals(detail)) {
				this.mainmidlet.ShowTitle();
			}
			//}else if(label.equals("确定")){
		} else {
			if (this.mainmidlet.display.getCurrent().equals(categorylist)) {
				this.mainmidlet.ShowTitle();
			} else if (this.mainmidlet.display.getCurrent().equals(titlelist)) {
				this.mainmidlet.ShowDetail();
			}
		}
		//switch (.getSelectedIndex()) {
	}

	public Displayable ShowCategory() {
		MainMIDlet.ticker.setString("昆宇系统--信息发布");
		if (categorylist.size() == 0) { //size为0,需要连接，读取类别列表.
			System.out.println("new List");
			categorylist = new List("信息类别", Choice.IMPLICIT); //!!
			new Thread(new HttpConnector(1)).start(); //type=1 category ,2
													  // title,3 detail
		} else {
			categorylist.setTicker(MainMIDlet.ticker);
			categorylist.addCommand(MainMIDlet.backCommand);
			categorylist.addCommand(MainMIDlet.okCommand);
			categorylist.setCommandListener(this);
		}
		return categorylist;
	}

	public Displayable ShowTitle() {
		int cat = categorylist.getSelectedIndex();
		if (title[cat] == null) { //null 需要连接，读取类别列表.
			titlelist = new List("", Choice.IMPLICIT); //
			new Thread(new HttpConnector(2)).start(); //type=1 category ,2
													  // title,3 detail
		} else {
			titlelist = new List(category[cat], Choice.IMPLICIT);
			for (int i = 0; i < title[cat].length; i++) {
				titlelist.append(title[cat][i], null); //image ==null;
			}
		}
		MainMIDlet.ticker.setString("昆宇系统--信息列表");
		titlelist.setTicker(MainMIDlet.ticker);
		titlelist.addCommand(MainMIDlet.backCommand);
		titlelist.addCommand(MainMIDlet.okCommand);
		titlelist.setCommandListener(this);
		return titlelist;
	}

	public Displayable ShowDetail() { //可不返回displayable类型
		/*
		 * if(detail==null){ detail=new TextBox( "", "", 400, TextField.ANY );
		 * //!!! new Thread(new HttpConnector(3)).start(); //type=1 category ,2
		 * title,3 detail }else{ MainMIDlet.ticker.setString("昆宇系统--信息内容");
		 * detail.setTicker(MainMIDlet.ticker);
		 * detail.addCommand(MainMIDlet.backCommand);
		 * detail.setCommandListener(this); }
		 */
		detail = new TextBox("", "", 400, TextField.ANY); //!!!
		MainMIDlet.ticker.setString("昆宇系统--信息内容");
		detail.setTicker(MainMIDlet.ticker);
		detail.addCommand(MainMIDlet.backCommand);
		detail.setCommandListener(this);
		new Thread(new HttpConnector(3)).start(); //type=1 category ,2 title,3
												  // detail
		return detail;
	}

	class HttpConnector implements java.lang.Runnable {
		int type;

		public HttpConnector(int type) {
			this.type = type; //type=1 category ,2 title,3 detail

		}

		public void run() {
			switch (type) {
			case 1:
				getCategory();
				break;
			case 2:
				getTitle();
				break;
			case 3:
				getDetail();
				break;
			default:
				break;
			}

		}
	}

	private void getCategory() {
		content = "读取信息类别";
		try {
			MainMIDlet.url = "http://" + MainMIDlet.serverip
					+ "/CourseSelect/ProcessNews?type=1&target=0"; //1
																   // category,2
																   // title,3
																   // detail
			System.out.println(MainMIDlet.url);
			this.mainmidlet.imagescreen.show(3, "连接服务器……", 1); //3:load
																	 // 错误返回
																	 // 1:主菜单
			HttpConnection connection = (HttpConnection) Connector
					.open(MainMIDlet.url);
			InputStream is = null;
			is = connection.openInputStream();
			DataInputStream dis = new DataInputStream(is);
			System.out.println(dis.readUTF());
			int errorcode = dis.readInt();
			System.out.println(errorcode);

			if (errorcode >= 0) { //没有错误则errorcode表示信息类别数。
				category = new String[errorcode];
				for (int i = 0; i < errorcode; i++) {
					category[i] = dis.readUTF();
					categorylist.append(category[i], null);
				}
				title = new String[errorcode][]; //分配第一维空间
				titleID = new int[errorcode][];

				dis.close();
				is.close();
				connection.close();

				//this.mainmidlet.display.setCurrent(categorylist);
				this.mainmidlet.ShowCategory();

				//this.mainmidlet.imagescreen.show(3, "连接服务器成功...", 7);
				// //3:load 7:信息类别

			} else {
				switch (errorcode) { //判断错误代码
				case -3:
					content = "与数据库连接错误";
					break;
				default:
					//System.out.println(content);
					content = "连接服务器失败";
					break;
				}
				this.mainmidlet.imagescreen.show(2, content, 1); //错误返回 1:主菜单
				//				next:0-登录
				// 1-主菜单,2-选课,3-查询,4-修改密码界面,5-选择班级，6-显示课表,7-信息类别，8-标题列表，9-详细信息
			}
		} catch (IOException ex) {
			ex.printStackTrace();
			this.mainmidlet.imagescreen.show(2, "连接服务器失败", 1);
		}
	}

	private void getTitle() {
		int cat = categorylist.getSelectedIndex() + 1;
		try {
			MainMIDlet.url = "http://" + MainMIDlet.serverip
					+ "/CourseSelect/ProcessNews?type=2&target=" + cat;

			System.out.println(MainMIDlet.url);
			HttpConnection connection = (HttpConnection) Connector
					.open(MainMIDlet.url);

			InputStream is = null;
			is = connection.openInputStream();
			DataInputStream dis = new DataInputStream(is);

			int errorcode = dis.readInt();
			System.out.println(errorcode);
			if (errorcode >= 0) { //没有错误则errorcode表示 标题数。
				titleID[cat - 1] = new int[errorcode];
				title[cat - 1] = new String[errorcode];
				for (int i = 0; i < errorcode; i++) {
					titleID[cat - 1][i] = dis.readInt();
					title[cat - 1][i] = dis.readUTF();
				}
				dis.close();
				is.close();
				connection.close();

				this.mainmidlet.ShowTitle();
				//this.mainmidlet .display .setCurrent( this.titlelist);

			} else {
				switch (errorcode) { //判断错误代码
				case -3:
					content = "与数据库连接错误";
					break;
				default:
					//System.out.println(content);
					content = "连接服务器失败";
					break;
				}
				this.mainmidlet.imagescreen.show(2, content, 7); //7-信息类别
			}
		} catch (IOException ex) {
			ex.printStackTrace();
			this.mainmidlet.imagescreen.show(2, "连接服务器失败", 7); //7-信息类别
		}
	}

	private void getDetail() {
		int ID = 0;
		ID = titleID[categorylist.getSelectedIndex()][titlelist
				.getSelectedIndex()];
		System.out.println("ID=" + ID);
		try {
			MainMIDlet.url = "http://" + MainMIDlet.serverip
					+ "/CourseSelect/ProcessNews?type=3&target=" + ID; //1
																	   // category,2
																	   // title,3
																	   // detail
			System.out.println(MainMIDlet.url);
			HttpConnection connection = (HttpConnection) Connector
					.open(MainMIDlet.url);

			InputStream is = null;
			is = connection.openInputStream();
			DataInputStream dis = new DataInputStream(is);

			int errorcode = dis.readInt();

			System.out.println(errorcode);
			if (errorcode > 0) { //没有错误则errorcode表示信息类别。

				detail.setString(dis.readUTF()); //显示详细信息
				detail
						.setTitle(title[categorylist.getSelectedIndex()][titlelist
								.getSelectedIndex()]);

				dis.close();
				is.close();
				connection.close();
				//this.mainmidlet.ShowDetail();
				this.mainmidlet.display.setCurrent(detail); //??

			} else {
				switch (errorcode) { //判断错误代码
				case -3:
					content = "与数据库连接错误";
					break;
				default:
					//System.out.println(content);
					content = "连接服务器失败";
					break;
				}
				this.mainmidlet.imagescreen.show(2, content, 8); //错误返回 7:信息类别
				//next:0-登录
				// 1-主菜单,2-选课,3-查询,4-修改密码界面,5-选择班级，6-显示课表,7-信息类别，8-标题列表，9-详细信息
			}
		} catch (IOException ex) {
			ex.printStackTrace();
			this.mainmidlet.imagescreen.show(2, "连接服务器失败", 1);
		}
	}

}