filepartition.java

可以按照大小和个数分割利用JAVA来实现mP3的播放

package fileCutter;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.TitledBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.event.*;
import java.io.*;
import java.text.DecimalFormat;

public class FilePartition  extends JFrame implements ActionListener,ChangeListener {
	/**
	 * 这个面板主要是发现了分割和合并面板的共同之处，故而加以了改进之使用一套面板即可完成可两个页面
	 */
	
	private static final long serialVersionUID = 1L;
    float abssize=0;   //分割文件时的子文件大小
    int bufsize=1024*1024;//输入输出流缓冲区的大小
    boolean noproblem=true;//各项信息都填充正确
	File file_in,file_out;    //读入和写出的两个文件
	JTabbedPane tabpane;
	JPanel[] panel=new JPanel[10];
	JButton[] button=new JButton[5];
	JLabel labelIn,labelOut,instructionA,instructionB;
	JTextField textIn,textOut,size,num;
	TextArea info;
	JRadioButton bysize,bynum;
	JComboBox box;
	ImageIcon ico,pic;
	ImagePanel imagepanel;
	String[] str={"选择文件","选择路径","确定","重置","退出"};//即对应五个按钮的次序
	String[] items={"byte","Kb","Mb"};//选择框中的内容
	String instruction="1.导入列表文件来合并时，需确保列表文件和子文件在同一目录下\n"+
	                   "\n2.合并时要求子文件不能有缺失，否则会合并失败\n";
	FilePartition(){
		super("文件分割器");
		for(int i=0;i<panel.length;i++)
			panel[i]=new JPanel();
		for(int i=0;i<button.length;i++){
			button[i]=new JButton(str[i]);
			}
		labelIn=new JLabel("输入文件");
		labelOut=new JLabel("输出位置");
		
		instructionA=new JLabel("分割状态：选择待分割文件、目标位置和分割方式，确定即可");
		instructionB=new JLabel("合并状态：选择待合并文件的.list文件、目标位置，确定即可");
		
		textIn=new JTextField(null,20);textIn.setEditable(false);
		textOut=new JTextField(null,20);textOut.setEditable(false);
		
		size=new JTextField(4);
		num=new JTextField(6);num.setEditable(false);
		
		info=new TextArea(5,50);info.setEditable(false);
		
		bysize=new JRadioButton("按大小分割");bysize.setSelected(true);
        bynum=new JRadioButton("按个数分割");
	    
        box=new JComboBox();
		for(int i=0;i<items.length;i++)
		box.addItem(items[i]);
		box.setSelectedIndex(1);
		
	    ico=new ImageIcon(this.getClass().getResource("owner.ico"));
		imagepanel=new ImagePanel(ico);
		pic=new ImageIcon(this.getClass().getResource("System Finder.pic"));
		
		tabpane=new JTabbedPane();          //㈠选项卡模块
		tabpane.setTabPlacement(JTabbedPane.TOP);
		tabpane.addTab("分割文件", panel[6]);panel[6].add(instructionA);
		tabpane.addTab("合并文件",panel[7]);panel[7].add(instructionB);
		
		add(tabpane,BorderLayout.NORTH); //面板主要由三部分构成:㈠.选项卡tabpane
		add(panel[0],BorderLayout.CENTER);                //㈡.panel[0]中的三大组件
		add(panel[5],BorderLayout.SOUTH);                 //㈢.最下方的执行按钮㈠㈡㈢㈣㈤
		
		panel[0].add(panel[2],BorderLayout.NORTH);//㈡主面板panel[0]的组成：①
		panel[0].add(panel[3],BorderLayout.CENTER);                  //②
		panel[0].add(panel[4],BorderLayout.SOUTH);                   //③
		
		panel[2].setBorder(new TitledBorder("路径选择"));  //①路径选择模块panel[2]
		panel[2].setLayout(new GridLayout(2,1));
		JPanel p1,p2;p1=new JPanel();p2=new JPanel();
		panel[2].add(p1);panel[2].add(p2);
		p1.add(labelIn);p1.add(textIn);p1.add(button[0]);
		p2.add(labelOut);p2.add(textOut);p2.add(button[1]);
		
		panel[3].setBorder(new TitledBorder("文件信息"));    //②文件信息模块panel[3]
        panel[3].add(info);
        
		panel[4].setBorder(new TitledBorder("选择分割方式"));//③文件分割方式选择模块panel[4]
		ButtonGroup group=new ButtonGroup();group.add(bysize);group.add(bynum);
		panel[4].add(bysize);panel[4].add(size);panel[4].add(box);panel[4].add(bynum);panel[4].add(num);
		
		panel[5].add(button[2]);panel[5].add(button[3]);panel[5].add(button[4]);//㈢执行按钮模块panel[5]
		
		///*以下为事件注册监听（含部分处理）模块*///
		tabpane.addChangeListener(this);   
		for(int i=2;i<button.length;i++)
		    button[i].addActionListener(this);
		button[0].addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae){
				JFileChooser choose=new JFileChooser();
				if(tabpane.getSelectedComponent().equals(panel[7]))
						choose.setFileFilter(new MyFileFilter("list","分割时产生的列表文件.list"));
				int returnVal=choose.showOpenDialog(null);
				if(returnVal == JFileChooser.APPROVE_OPTION) 
				{ file_in=choose.getSelectedFile();
				  if(tabpane.getSelectedComponent().equals(panel[7])&&!file_in.getPath().endsWith("list")){
					  JOptionPane.showMessageDialog(null,"请选择.list文件","错误",JOptionPane.WARNING_MESSAGE);
					  clear();info.setText(instruction);
				  }
				  textIn.setText(file_in.getAbsolutePath());
				  info.setText("文件名:"+file_in.getName()+'\n'+'\n'+"路径:"+file_in.getPath()+'\n'+'\n');
				  DecimalFormat dF = new DecimalFormat("0.00");
				  if(tabpane.getSelectedComponent().equals(panel[6]))
					  info.setText(info.getText()+"大小:"+file_in.length()+"byte = "+dF.format(file_in.length()/1024.0)
							  +"Kb = "+dF.format(file_in.length()/1024/1024.0)+"Mb");
				}
			}});
		button[1].addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae){
				JFileChooser choose=new JFileChooser();
				choose.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
				int returnVal=choose.showOpenDialog(null);
				if(returnVal == JFileChooser.APPROVE_OPTION) 
				{ file_out=choose.getSelectedFile();
				  textOut.setText(file_out.getAbsolutePath());
				  if(tabpane.getSelectedComponent().equals(panel[7]))
					  info.setText(info.getText()+"输出位置:"+file_out);
				}
			}});
		bysize.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae){
				if(bysize.isSelected()){
					size.setEditable(true);
					num.setEditable(false);
					num.setText(null);
				}}});
		bynum.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae){
				if(bynum.isSelected()){
					num.setEditable(true);
					size.setEditable(false);
					size.setText(null);
				}}});
		imagepanel.addMouseListener(new MouseAdapter(){
			public void mouseClicked(MouseEvent me){
			try {Runtime.getRuntime().exec("explorer   http://se.xjtu.edu.cn");
			     }catch (IOException e) {}
			}});
		pack();
		setVisible(true);	
        setBounds(300,120,405,450);
		setResizable(false);
		setIconImage(pic.getImage());
	}    //End of NewFrame()
	
	public void actionPerformed(ActionEvent ae) {
		 String str=ae.getActionCommand();
		    if(bynum.isSelected()){
				num.setEditable(true);
				size.setEditable(false);
			}
			if(bysize.isSelected()){
				size.setEditable(true);
				num.setEditable(false);
			}
		 if(str.equals("确定")) {
			 if(file_in==null||file_out==null)    //没有选择文件或者位置时报错
				 JOptionPane.showMessageDialog(null,"请将信息填写完整","请注意",JOptionPane.WARNING_MESSAGE);
			 else{
			     if(tabpane.getSelectedComponent().equals(panel[6])){
			        if(bysize.isSelected()){
				       try{abssize=Float.parseFloat(size.getText());
				           if(!(abssize>0))throw new NumberFormatException();
				           }catch(NumberFormatException nfe){
				        	   JOptionPane.showMessageDialog(null,"输入的分割大小有误,请输入合理的大小","请注意",JOptionPane.WARNING_MESSAGE);
				        	   size.setText(null);noproblem=false;
				           }
				       switch(box.getSelectedIndex()){
				           case 0:break;
				           case 1:abssize=Math.round(abssize*1024);break;
				           case 2:abssize=Math.round(abssize*1024*1024);break;
				       }
			        }
			        else if(bynum.isSelected()){
			        	int numInt=3;
				        try{numInt=Integer.parseInt(num.getText());
				            if(!(numInt>0))throw new NumberFormatException();
				          }catch(NumberFormatException nfe4){
				              JOptionPane.showMessageDialog(null,"输入的分割个数有误，请输入合理的个数","请注意",JOptionPane.WARNING_MESSAGE);
				              num.setText(null);noproblem=false;
				          }
				      abssize=file_in.length()/numInt+file_in.length()%numInt;
			        }
			        if(noproblem)split(abssize);
			     }
			     else if(noproblem)combine(file_in.getAbsolutePath());
		     }
			 noproblem=true;
		  }
		 if(str.equals("重置")) clear(); 
		 if(str.equals("退出")) System.exit(0);
	}

	private void split(float size){  //分割方法
		try{
			info.setText(info.getText().concat("\n^_^ 分割中→ → ^_^＋^_^"));
			BufferedInputStream in=new BufferedInputStream(new FileInputStream(file_in),bufsize);   
			BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(new File(file_out,"1_"+file_in.getName())),bufsize);
		    BufferedWriter list=new BufferedWriter(new FileWriter(new File(file_out,"list_of_"+file_in.getName()+".list")));
		    int n = 1; 
		    list.write(file_in.getName()+'\n');  //list文件中包括了原文件名和子文件名
		    for (int b, i = 0; (b = in.read()) != -1; i++) {       
			   if (i>=size) {                    
				   out.close();
				   list.write(n+"_"+file_in.getName()+'\n');
				   out=new BufferedOutputStream(new FileOutputStream(new File(file_out,++n+"_"+file_in.getName())),bufsize);       
				   i=0; 
		         }        
			   out.write(b);
            }     
		    out.close();
		    list.write(n+"_"+file_in.getName()+'\n');
		    list.close();
		    JOptionPane.showMessageDialog(null, "分割操作已完成\n子文件和.list文件都不要弄丢哦！");
		}
		catch(FileNotFoundException fnfe){JOptionPane.showMessageDialog(null,fnfe,"错误",JOptionPane.WARNING_MESSAGE);}
		catch(EOFException eof) {JOptionPane.showMessageDialog(null,eof,"错误",JOptionPane.WARNING_MESSAGE);}
		catch(IOException ioe)	{JOptionPane.showMessageDialog(null,ioe,"错误",JOptionPane.WARNING_MESSAGE);} 
		}
	
	private void combine(String file){//合并方法
		try{
			info.setText(info.getText().concat("\n^_^＋^_^ 合并中→ → ^_^"));
			String str="";
			String inPath="";
			BufferedOutputStream out;
		    BufferedInputStream in;
			BufferedReader read=new BufferedReader(new FileReader(file)); //从.list中读取文件名 
			File exist=new File(file_out,str=read.readLine());
			if(exist.exists()) out=new BufferedOutputStream(new FileOutputStream(new File(file_out,"$"+str)),bufsize);
			else  out=new BufferedOutputStream(new FileOutputStream(new File(file_out,str)),bufsize);
		    inPath=file_in.getParent();
		    str=read.readLine();
		    while(str!=null){	
		    	in=new BufferedInputStream(new FileInputStream(new File(inPath,str)),bufsize);
				for(int b;(b=in.read())!=-1;){
					out.write(b);
				}
				in.close();
				str=read.readLine();
			}
			out.close();
			read.close();
			JOptionPane.showMessageDialog(null, "合并操作已完成\n文件在"+file_out);
			///*下面的代码用于合并成功以后删除分割时产生的子文件*///
			BufferedReader delete=new BufferedReader(new FileReader(file));
			String tempStr=delete.readLine();
			while((tempStr=delete.readLine())!=null){
				File killFile=new File(file_in.getParent(),tempStr);
				killFile.delete();
			}
			delete.close();
			File killlistFile=new File(file);
			killlistFile.delete();
			
		}catch(FileNotFoundException fnfe){
			JOptionPane.showMessageDialog(null,fnfe+"\n合并失败，请确认.list文件和子文件没有缺失后重新操作","错误",JOptionPane.WARNING_MESSAGE);
			clear();
			}
		 catch(EOFException eof) {
			 JOptionPane.showMessageDialog(null,eof+"文件未写入结束信息，无法完成操作","错误",JOptionPane.WARNING_MESSAGE);
			 }
		 catch(IOException ioe)	{
			 JOptionPane.showMessageDialog(null,ioe+"数据流读写过程发生未知错误","错误",JOptionPane.WARNING_MESSAGE);
			 }
		 catch(SecurityException se) {
			 JOptionPane.showMessageDialog(null,se+"删除文件过程发生未知错误\n可能文件正在使用或被保护或已不存在","错误",JOptionPane.WARNING_MESSAGE);
			 }
	}
	
	public void stateChanged(ChangeEvent arg0) {
		clear(); //如果选项卡发生了变化，若切换到分割界面则显示panel[4](选择分割方式模块)，否则显示图片；其他区域只改变名称
		if(tabpane.getSelectedComponent().equals(panel[6])){
			panel[2].setBorder(new TitledBorder("路径选择"));
			panel[3].setBorder(new TitledBorder("文件信息"));
			info.setText("");
			panel[0].remove(imagepanel);
			panel[0].add(panel[4]);
			imagepanel.setVisible(false);
			panel[4].setVisible(true);
		}
		else if(tabpane.getSelectedComponent().equals(panel[7])){
			panel[2].setBorder(new TitledBorder("导入列表文件"));
			panel[3].setBorder(new TitledBorder("注意事项"));
			info.setText(instruction);
			panel[0].remove(panel[4]);
			panel[0].add(imagepanel);
			panel[4].setVisible(false);
			imagepanel.setVisible(true);
		}
	}
	
	private void clear() {  //重置和页面切换时的清理工作由改方法完成
		textIn.setText("");textOut.setText("");size.setText("");num.setText("");
		if(tabpane.getSelectedComponent().equals(panel[6]))info.setText("");
        file_in=file_out=null;
	}
	
	public static void main(String args[]){
		FilePartition a=new FilePartition();
		a.addWindowListener(new WindowAdapter(){
			   public void windowClosing(WindowEvent e)
			   {  System.exit(0);}
		   });
	} //End of main function
}//End of Jiemian class