filterpane2.java

网络代理服务器的设计与实现 实现对网络的管理

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class filterPane2 extends JPanel{
	private JTextField text;
    private JButton button;
    private JButton dbutton;
    private JButton exit;
    private JTextArea textArea;
    private JLabel label;
    String str=null;

	public filterPane2() {
		this.setLayout(null);
		 
    	label=new JLabel("输入添加/删除禁止访问的网站地址：");
    	label.setHorizontalAlignment(SwingConstants.LEFT);
    	label.setBounds(new Rectangle(0, 10, 500, 20));

	    text=new JTextField(20);
	    text.setText("");
	    text.setHorizontalAlignment(SwingConstants.LEFT);
	    text.setBounds(new Rectangle(0,30,200,20));
	    
	    button=new JButton("添加");
	    button.setBounds(new Rectangle(202,30,60,20));
	    
	    dbutton=new JButton("删除");
	    dbutton.setBounds(new Rectangle(264,30,60,20));
	    
	    exit=new JButton("返回");
    	exit.setBounds(new Rectangle(326,30,60,20));
	    
    	textArea=new JTextArea();
    	textArea.setEditable(false);
    	textArea.setBounds(new Rectangle(2,55,300,200));
    	//添加滚动条    	      

	    this.add(label, null);
	    this.add(text, null);
	    this.add(button, null);
	    this.add(dbutton,null);
	    this.add(exit);
	    this.add(textArea,null);
	    read();
	    
	    button.addActionListener(new ActionListener(){
	    	public void actionPerformed(ActionEvent e){
	    		str=text.getText();
	    		if(str.equals("")){
	    			JOptionPane.showMessageDialog(null,"输入不能为空！","错误",JOptionPane.ERROR_MESSAGE);
	    		}
	    		else{
	    			insert(str);
	    		    text.setText("");
	    	    }
	    	}
	    });
	    
	    dbutton.addActionListener(new ActionListener(){
	    	public void actionPerformed(ActionEvent e){
	    		str=text.getText();
	    		if(str.equals("")){
	    			JOptionPane.showMessageDialog(null,"输入不能为空！","错误",JOptionPane.ERROR_MESSAGE);
	    		}
	    		else{
	    			delete(str);
	    	    }
	    		text.setText("");
	    	}
	    });
	    
	    exit.addActionListener(new ActionListener(){
	    	public void actionPerformed(ActionEvent e){
	    		eventFrame.jSplitPane1.remove(eventFrame.jSplitPane1.getRightComponent());
	    		if(toolBarPanel.state()){
	    			eventFrame.jSplitPane1.add(eventFrame.welcomePanel1,JSplitPane.RIGHT);
	    		}else{
	    			eventFrame.jSplitPane1.add(eventFrame.disPlay,JSplitPane.RIGHT);
	    		}
	    	}
	    });
	}

	public static boolean find(String str1){
		String s=null;
		boolean flag=false;
		try{
			BufferedReader in=new BufferedReader(new FileReader("bansite\\bansite2.txt"));
			while((s=in.readLine())!=null){
				if(s.equals(str1)){
					flag=true;
				    break;
				}
			}
		}catch(Exception e){
			JOptionPane.showMessageDialog(null,"读文件出错！","错误",JOptionPane.ERROR_MESSAGE);
		}		
		return flag;
	}
	
	public void read(){
		String s=null;
		try{
			BufferedReader in=new BufferedReader(new FileReader("bansite\\bansite2.txt"));
			while((s=in.readLine())!=null){
				textArea.append(s);
				textArea.append("\n");
			}
		}catch(Exception e){
			JOptionPane.showMessageDialog(null,"读文件出错！","错误",JOptionPane.ERROR_MESSAGE);
		}		
	}	
	
	public  void insert(String str1){
		boolean flag=find(str1);
		if(!flag){		
		    try{
			    BufferedWriter out=new BufferedWriter(new FileWriter("bansite\\bansite2.txt",true));
			    out.write(str1);
			    out.newLine();
			    out.flush();
			    out.close();
			    textArea.append(str1);
			    textArea.append("\n");
			    JOptionPane.showMessageDialog(null,"添加成功！","消息",JOptionPane.INFORMATION_MESSAGE);
		    }catch(IOException e){
		    	JOptionPane.showMessageDialog(null,"写文件出错！","错误",JOptionPane.ERROR_MESSAGE);
		    }
		}
		else{
			JOptionPane.showMessageDialog(null,"该地址已经存在！","消息",JOptionPane.INFORMATION_MESSAGE);
		}
	}
	
	public void delete(String str1){
		String s=null;
		boolean flag=find(str1);
		if(flag){		
		    try{
		    	BufferedReader in=new BufferedReader(new FileReader("bansite\\bansite2.txt"));
			    BufferedWriter out=new BufferedWriter(new FileWriter("bansite\\temp.txt",false));
			    while((s=in.readLine())!=null){
			    	if(s.equals(str)==false){
			    		out.write(s);
					    out.newLine();
			    	}
			    }
			    out.flush();
			    out.close();
			    in.close();
			    
			    textArea.setText("");
			    in=new BufferedReader(new FileReader("bansite\\temp.txt"));
			    out=new BufferedWriter(new FileWriter("bansite\\bansite2.txt",false));
			    while((s=in.readLine())!=null){	
			    		out.write(s);
					    out.newLine();
					    textArea.append(s);
					    textArea.append("\n");
			    }
			    out.flush();
			    out.close();
			    in.close();
			    
			    File f=new File("bansite\\temp.txt");
			    f.delete();
			    
			    JOptionPane.showMessageDialog(null,"删除成功！","消息",JOptionPane.INFORMATION_MESSAGE);
		    }catch(IOException e){
		    	JOptionPane.showMessageDialog(null,"文件操作出错！","错误",JOptionPane.ERROR_MESSAGE);
		    }
		}
		else{
			JOptionPane.showMessageDialog(null,"该地址不存在！删除失败！","消息",JOptionPane.INFORMATION_MESSAGE);
		}
	}
}