filesplit.java

Java编写的一个文件分割工具的源代码

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

public class FileSplit extends JFrame implements ActionListener {
	
	private JButton jbtOpen = new JButton("打开");
	private JButton jbtOpen2 = new JButton("选取");
	private JButton jbtSplit = new JButton("拆分");
	private JButton jbtCompages = new JButton("组合");
	private JLabel labelOpen = new JLabel("源文件为");
	private JLabel labelOpen2 = new JLabel("选取文件为");
	private JLabel labelSplit = new JLabel("分割份数：");
	private JTextField textSplit = new JTextField(5);
	private JProgressBar progressBar = new JProgressBar();
	private JProgressBar progressBar2 = new JProgressBar();
	private JFileChooser fileChooser = new JFileChooser();
	private int acount = 0;
	private File file = null;
	private File[] files = null;
	
	public FileSplit() {
		this.setSize(350,300);
		this.setTitle("文件分割机（制作人：白洋）");
		this.setResizable(false);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container contentPane = this.getContentPane();
		
		Box box1 = Box.createHorizontalBox();
		box1.add(Box.createHorizontalStrut(5));
		box1.add(jbtOpen);
		box1.add(Box.createHorizontalStrut(10));
		box1.add(labelOpen);
		box1.add(Box.createHorizontalGlue());
		
		Box box2 = Box.createHorizontalBox();
		box2.add(Box.createHorizontalStrut(5));
		box2.add(labelSplit);
		box2.add(Box.createHorizontalStrut(5));
		textSplit.setMaximumSize(textSplit.getPreferredSize());
		box2.add(textSplit);
		box2.add(Box.createHorizontalGlue());
		
		Box box3 = Box.createHorizontalBox();
		box3.add(Box.createHorizontalStrut(5));
		box3.add(jbtSplit);
		box3.add(Box.createHorizontalStrut(10));
		box3.add(progressBar);
		box3.add(Box.createHorizontalGlue());
		
		Box box4 = Box.createHorizontalBox();
		box4.add(Box.createHorizontalStrut(5));
		box4.add(jbtOpen2);
		box4.add(Box.createHorizontalStrut(10));
		box4.add(labelOpen2);
		box4.add(Box.createHorizontalGlue());
		
		Box box5 = Box.createHorizontalBox();
		box5.add(Box.createHorizontalStrut(5));
		box5.add(jbtCompages);
		box5.add(Box.createHorizontalStrut(10));
		box5.add(progressBar2);
		box5.add(Box.createHorizontalGlue());
		
		Box vBox1 = Box.createVerticalBox();
		vBox1.add(box1);
		vBox1.add(box2);
		vBox1.add(box3);
		vBox1.setBorder(BorderFactory.createTitledBorder("分割文件"));
		
		Box vBox2 = Box.createVerticalBox();
		vBox2.add(box4);
		vBox2.add(box5);
		vBox2.setBorder(BorderFactory.createTitledBorder("组合文件"));
		
		Box vBox = Box.createVerticalBox();
		vBox.add(Box.createVerticalGlue());
		vBox.add(vBox1);
		vBox.add(Box.createVerticalStrut(5));
		vBox.add(vBox2);
		vBox.add(Box.createVerticalGlue());
		contentPane.add(vBox);
		
		jbtOpen.addActionListener(this);
		jbtOpen2.addActionListener(this);
		jbtSplit.addActionListener(this);
		jbtCompages.addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent event) {
		
		//选择源文件
		if (event.getSource().equals(jbtOpen)) {
			
			int chooseOK = 0;
			fileChooser.setCurrentDirectory(new File("."));//设置当前工作目录
			chooseOK = fileChooser.showOpenDialog(this);
			
			if (chooseOK == 0) {
				file = fileChooser.getSelectedFile();
			}	
			else {
				return;
			}
			//size计算出源文件的大小
			double size = file.length() / 1024.0;
			size = Math.round(size * 100);
			size = size / 100;
			
			labelOpen.setText("源文件大小为:" + size + "KB");
			
			//acount计算出for循环的总次数
			byte[] b = new byte[512];
			acount = (int)(file.length()/b.length);
			if (file.length()%b.length != 0) {
				acount++;
			}
			progressBar.setMaximum(acount);
				
		}
		
		//选择组合文件文件夹
		if (event.getSource().equals(jbtOpen2)) {
			
			int chooseOK = 0;
			fileChooser.setCurrentDirectory(new File("."));//设置当前工作目录
			fileChooser.setMultiSelectionEnabled(true);//可以选择多个文件
			chooseOK = fileChooser.showOpenDialog(this);
			
			if (chooseOK == 0) {
				files = fileChooser.getSelectedFiles();
			}	
			else {
				return;
			}
			
			//size计算出选取文件的总大小
			double size = 0;
			for (int i=0; i<files.length; i++) {
				size += files[i].length();
			}
			size = size / 1024.0;
			size = Math.round(size * 100);
			size = size / 100;
			labelOpen2.setText("选取了:"+files.length+"个文件."
				+"总大小为:"+ size + "KB");
			
			//acount计算出组合文件进度条的最大值
			//分别计算每个文件的组合所需要的运算次数
			byte[] b = new byte[512];
			for (int i=0; i<files.length; i++) {
				acount += (int)(files[i].length()/b.length);
				if (files[i].length()%b.length != 0) {
					acount++;
				}
			}
			progressBar2.setMaximum(acount);
			
		}
		
		//分割文件
		if (event.getSource().equals(jbtSplit)) {
			
			if (file == null) {
				JOptionPane.showMessageDialog(this,"源文件不存在！","警告",JOptionPane.ERROR_MESSAGE);
				return;
			}
			if (textSplit.getText().equals("")) {
				JOptionPane.showMessageDialog(this,"没有设置分割份数！","警告",JOptionPane.ERROR_MESSAGE);
				return;
			}
			int x = 0;
			byte[] b = new byte[512];
			
			/*分割份数(默认为1)
			 *如果填写4，splitAcount的值=3
			 *前三个文件的大小相同，最后一是剩余文件的大小
			 */
			int splitAcount = Integer.parseInt(textSplit.getText())-1;
			if (splitAcount < 1) {
				splitAcount = 1;
			}
			
			FileInputStream fin = null;
			FileOutputStream fout = null;
			
			try {
				fin = new FileInputStream(file);
				
				//分割文件
				int m=1;
				
				//创建文件夹
				new File("split").mkdir();
				
				fout = new FileOutputStream("split/split_" + m + ".DAT");
				
				for (int i=1; i<=acount; i++) {
					x = fin.read(b,0,b.length);
					if (i%(acount/splitAcount)==0) {
						m++;
						fout = new FileOutputStream("split/split_" + m + ".DAT");
					}
					fout.write(b,0,x);
					progressBar.setValue(i);
				}
				
				fin.close();
				fout.close();
				
				JOptionPane.showMessageDialog(this,"文件分割成功！");

			}
			catch (IOException e) {e.printStackTrace();}	
		}
		
		//组合文件
		if (event.getSource().equals(jbtCompages)) {
			
			if (files == null) {
				JOptionPane.showMessageDialog(this,"没有选择待组合的文件！","警告",JOptionPane.ERROR_MESSAGE);
				return;
			}
			
			int x = 0;
			byte[] b = new byte[512];
			FileInputStream fin = null;
			FileOutputStream fout = null;
			
			try {
				fout = new FileOutputStream("compage.DAT");
				for (int i=0; i<files.length; i++) {
					fin = new FileInputStream(files[i]);
					
					while ((x = fin.read(b,0,b.length)) != -1) {
						fout.write(b,0,x);
						progressBar2.setValue(progressBar2.getValue()+1);
					}
					fin.close();
				}
				
				fout.close();
				
				JOptionPane.showMessageDialog(this,"文件组合成功！");
			}
			catch (IOException e) {e.printStackTrace();}	
		}
	}
		
	public static void main(String[] args) {
		FileSplit split = new FileSplit();
		split.setVisible(true);
	}
}