rssparser.java

Java+XML写的RSS阅读器

/*
Application运行入口
java RssParser

classname RssParser

名称：RSS解析器
Version 1.0

Date 2006-06-03
Down www.codefans.net

CopyRight
清华大学数学科学系
数32班
王元涛
2003012142
*/
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.URLConnection;
import java.util.*;
import javax.swing.table.*;
import org.w3c.dom.*;
import org.apache.crimson.tree.XmlDocument;
import java.io.*; 
import javax.xml.parsers.*;
import javax.swing.plaf.multi.MultiTreeUI;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////表现层
public class RssParser extends Applet{//主类
	//全局对象
	static RssParser rssParser;
	static Frame frame;
	static PanelTree pTree;
	static PanelTable pTable;
	static Label status;
	
	//初始化布局
	public void init(){
		setLayout(new BorderLayout());
		pTable = new PanelTable();
		pTree = new PanelTree(pTable);
		status = new Label("Status:");
		add("West", pTree);
		add("Center",pTable);
		add("South",status);
		status.setText("inited");
	}
	
	//程序入口
	public static void main(String[] args){
		frame = new Frame("RssParser");
		rssParser = new RssParser();
		rssParser.init();
		
		frame.addWindowListener(new WindowAdapter()//匿名内部类
		{
			public void windowClosing(WindowEvent e) {//关闭窗口
				System.exit(0);
			}
		}
		);

		frame.add("Center", rssParser);
		frame.setSize(1024, 700);
		frame.show();
	}
}

class PanelTree extends Panel implements MouseListener{//左侧的树

	//全局变量
	public JTree tree;
	public MenuActions popp;
	public RSSNode top;
	PanelTable targetTable;
	
	//构造方法初始化布局
	public PanelTree(PanelTable targetTable){
		this.targetTable=targetTable;
		//添加菜单对象
		popp=new MenuActions(this.tree);
		add(popp);
		//添加树
		JScrollPane jsp=creatTree();
	//	jsp.setBounds(new Rectangle(0,0,300,650));
		add(jsp);
	}
	
	//创建树
	public JScrollPane creatTree(){
		//根节点为RSSNode的对象
		top = new RSSNode("MyRSS_root");
		top.type=0;
		try{
			//根据频道定义文件创建树内容
			XmlProcessor.opmlRead(top,"opml.xml");
		}catch(Exception e){
			RssParser.status.setText(e.getMessage());
		}
		tree = new JTree(top);
		//监听鼠标在树上的动作
		tree.addMouseListener(this);

		//返回带自动滚动条的树
		return new JScrollPane(tree,
		ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
		ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
	}
	public void mouseClicked(MouseEvent e){
			TreePath selPath = tree.getPathForLocation(e.getX(),e.getY());
				if(selPath!=null){
					//返回点中的对象
					Object o=selPath.getLastPathComponent();
					//如果是左键点击
					if(e.getButton()==e.BUTTON1){
						//状态栏输出RSS的URL
						if(((RSSNode)o).url!=null)
							RssParser.status.setText(((RSSNode)o).url.toString());
						else{
							RssParser.status.setText("feed://about:_root");
						}
					}
					//如果是右键
					if(e.getButton()==e.BUTTON3){
						//弹出菜单
						popp.curNode=(RSSNode)o;
						popp.add(popp.popupMenu1);
						popp.popupMenu1.removeAll();
						//添加菜单项
						if(popp.curNode.type==0){
							popp.popupMenu1.add(popp.menuItem1);
							popp.popupMenu1.add(popp.menuItem4);
						}else{
							popp.popupMenu1.add(popp.menuItem2);
							popp.popupMenu1.add(popp.menuItem3);
						}
						//菜单位置与事件发生位置偏差修正，真正显示
						popp.popupMenu1.show(popp,e.getX(),e.getY()-200);
						//重绘
						popp.repaint();
					}
				}
	}	
	public void mouseReleased(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mousePressed(MouseEvent e){}
}

class PanelTable extends Panel{//右侧的表

	//全局变量
	public JTable table;
	public Vector row;
	public DefaultTableModel tableModel;
	String[] tableHeads = {"标题","时间","摘要","来源"};
	
	//构造表
	public PanelTable(){
		tableModel = new DefaultTableModel();
		Vector tableHeadName = new Vector();
		//写表头
		for (int i = 0; i < tableHeads.length; i++) {
			tableHeadName.add(tableHeads[i]);
		}
		tableModel.setDataVector(new Vector(),tableHeadName);
		//创建表
		table = new JTable(tableModel);
		//设置表外观
		table.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
		table.setPreferredScrollableViewportSize(new Dimension(700,600));
		table.getColumnModel().getColumn(0).setPreferredWidth(200);
		table.getColumnModel().getColumn(1).setPreferredWidth(120);
		table.setSurrendersFocusOnKeystroke(false);
	//	table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		table.setRowHeight(20);
		//为表加入滚动条
		JScrollPane jsp2=new JScrollPane(table,
		ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
		ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		add(jsp2);
	}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////交互层

class MenuActions extends JPanel implements ActionListener{//菜单

	//全局变量
	public String title;
	public RSSNode curNode;//关键变量
	JTree tree;
	public PopupMenu popupMenu1 = new PopupMenu();
	public MenuItem menuItem1 = new MenuItem();
	public MenuItem menuItem2 = new MenuItem();
	public MenuItem menuItem3 = new MenuItem();
	public MenuItem menuItem4 = new MenuItem();

	//构造菜单和菜单项
	public MenuActions(JTree tree) {
		this.tree=tree;
		this.setLayout(null);

		menuItem1.setLabel("添加RSS");
		menuItem2.setLabel("删除RSS");
		menuItem3.setLabel("显示RSS");
		menuItem4.setLabel("显示全部RSS");
		menuItem1.addActionListener(this);
		menuItem2.addActionListener(this);
		menuItem3.addActionListener(this);
		menuItem4.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("添加RSS"))addRss(e);
		if(e.getActionCommand().equals("删除RSS"))delRss(e);
		if(e.getActionCommand().equals("显示RSS"))showRss(e);
		if(e.getActionCommand().equals("显示全部RSS"))showAll(e);
	}


	void addRss(ActionEvent e){//添加RSS
		//清空表
		RssParser.pTable.tableModel.setRowCount(0);
		//弹出对话框，要求输入RSS的URL，程序自动获取其名称
		String url=JOptionPane.showInputDialog("Please input RSS Url:(and then the name will be given)");
		if(url!=null){
			String name="New rssSite";
			RSSNode tmp=new RSSNode(name);
			try{
				//字符串到URL对象的转换
				tmp.url=new URL(url);
				//设置为临时类型
				tmp.type=2;
				curNode.add(tmp);
				//加入后自动更新
				XmlProcessor.rssRead(tmp,tree);
			}
			catch(MalformedURLException ex){
				RssParser.status.setText(ex.getMessage());
			}catch(Exception ex2){
				RssParser.status.setText(ex2.getMessage());
			}
		}
	}

	void delRss(ActionEvent e){//删除RSS
		RssParser.pTable.tableModel.setRowCount(0);
		int i=JOptionPane.NO_OPTION;
		try{//确认删除
			i=JOptionPane.showConfirmDialog(RssParser.frame,
			"Are you sure to delete "+curNode.name+"?",
			"Confirmer",
			JOptionPane.YES_NO_OPTION);
		}catch(Exception ex){}
		if(i==JOptionPane.YES_OPTION){