package com.hss.chap13;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Scanner;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Chap13_03 {

    /**
     * @param args
     */
    public static void main(String[] args) {
    
        EventQueue.invokeLater(new Runnable(){
            public void run() {
                ZipFrame zf = new ZipFrame();
                zf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                zf.setVisible(true);
            }
            
        });

    }

}

class ZipFrame extends JFrame{
    
    public ZipFrame(){
        this.setBounds(200, 200, 500, 400);
        this.setLayout(new BorderLayout());
        //工具栏布局
        JMenuBar jmb = new JMenuBar();
        JMenu jm = new JMenu("file");
        JMenuItem jmi1 = new JMenuItem("open");
        JMenuItem jmi2 = new JMenuItem("exit");
        jm.add(jmi1);
        jm.add(jmi2);
        jmb.add(jm);
        this.setJMenuBar(jmb);
        
        //添加处理事件
        jmi1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                JFileChooser jfc = new JFileChooser();
                jfc.setCurrentDirectory(new File("."));
                int r = jfc.showOpenDialog(ZipFrame.this);
                if(r==JFileChooser.APPROVE_OPTION){
                    zipname=jfc.getSelectedFile().getPath();
                    try {
                        scannerFile();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
                        
        });
        jmi2.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        
        //添加textarea
        jta = new JTextArea();
        jsc = new JScrollPane(jta);
        //添加combobox
        fileCombo = new JComboBox();
        fileCombo.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                try {
                    loadFile((String)fileCombo.getSelectedItem());
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            }
            
        });
        
        this.add(jsc,BorderLayout.CENTER);
        this.add(fileCombo,BorderLayout.SOUTH);
    }
    
    public void scannerFile() throws IOException{
        //先将combox清空
        fileCombo.removeAllItems();
        ZipInputStream zis = new ZipInputStream(new FileInputStream(zipname));
        ZipEntry ze ; 
        while((ze=zis.getNextEntry())!=null){
            fileCombo.addItem(ze.getName());
            zis.closeEntry();
        }
        zis.close();
    }
    
    public void loadFile(String filename) throws Exception{
        //先将显示区域清空
        jta.setText("");
        ZipInputStream zis = new ZipInputStream(new FileInputStream(zipname));
        ZipEntry ze;
        while((ze=zis.getNextEntry())!=null){
            System.out.println(ze.getName()+"---"+filename);
            if(ze.getName().equals(filename)){
                Scanner in = new Scanner(zis);
                while(in.hasNextLine()){
                    String s = in.nextLine();
                    jta.append(s);
                    jta.append("\n");
                }
            }
            zis.closeEntry();
        }
        zis.close();
        
    }
    
    private String zipname;
    private JTextArea jta;
    private JScrollPane jsc;
    private JComboBox fileCombo;
    
}