java对大文件实现分割处理

分割后的结果如下：
package com.mingrisoft;import java.awt.EventQueue;import java.awt.FileDialog;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.io.File;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;public class ComminuteFrame extends JFrame { /** * */ private static final long serialVersionUID = 2547743180459668116L; private JPanel contentPane; private JTextField sourceTextField; private JTextField sizeTextField; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { ComminuteFrame frame = new ComminuteFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public ComminuteFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 430, 211); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); setTitle("文件分割"); JPanel panel = new JPanel(); panel.setBounds(0, 0, 414, 181); contentPane.add(panel); panel.setLayout(null); JLabel messagelabel = new JLabel("源文件："); messagelabel.setBounds(47, 41, 54, 20); panel.add(messagelabel); sourceTextField = new JTextField(); sourceTextField.setBounds(105, 41, 178, 21); panel.add(sourceTextField); sourceTextField.setColumns(10); JButton sourceButton = new JButton("选择"); sourceButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_sourceButton_actionPerformed(arg0); } }); sourceButton.setBounds(303, 40, 67, 23); panel.add(sourceButton); JLabel sizelabel = new JLabel("分割大小："); sizelabel.setBounds(34, 86, 67, 15); panel.add(sizelabel); sizeTextField = new JTextField(); sizeTextField.setBounds(105, 83, 178, 21); panel.add(sizeTextField); sizeTextField.setColumns(10); sizeTextField.addKeyListener(new KeyAdapter() { @Override public void keyTyped(KeyEvent event) { // 某键按下时调用的方法 char ch = event.getKeyChar(); // 获取用户键入的字符 if ((ch < '0' || ch > '9')) { // 如果用户输入的信息不为数字或小数 event.consume(); // 不允许用户键入 } } }); JLabel lblM = new JLabel("M"); lblM.setBounds(313, 86, 44, 15); panel.add(lblM); JButton cominButton = new JButton("分割"); cominButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_cominButton_actionPerformed(arg0); } }); cominButton.setBounds(101, 138, 93, 23); panel.add(cominButton); JButton close = new JButton("退出"); close.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { do_close_actionPerformed(arg0); } }); close.setBounds(229, 138, 93, 23); panel.add(close); } protected void do_sourceButton_actionPerformed(ActionEvent arg0) { FileDialog fd = new FileDialog(this); fd.setVisible(true); String path = fd.getDirectory() fd.getFile(); if (!path.equals("") && !(path == null)) { sourceTextField.setText(path); } } protected void do_cominButton_actionPerformed(ActionEvent arg0) { ComminuteUtil util = new ComminuteUtil(); String path = sourceTextField.getText(); int size = Integer.parseInt(sizeTextField.getText()); String subPath = path.substring(0, path.lastIndexOf("\\")); util.fenGe(new File(path), new File(subPath), size); JOptionPane.showMessageDialog(getContentPane(), "文件分割成功！", "信息提示框", JOptionPane.PLAIN_MESSAGE); } protected void do_close_actionPerformed(ActionEvent arg0) { System.exit(0); }}