java实现文件合并与分割

import java.awt.BorderLayout; import java.awt.List; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.RandomAccessFile; public class FileUniteCut extends JFrame implements ActionListener{ /** * */ private static final long serialVersionUID = 1L; /** * 构造函数界面中加入控件 */ public static final int LENGTH = 1000; String folderPath="./huang"; public FileUniteCut (){ super(); JPanel jtool = new JPanel(); jtool.add(open); jtool.add(delete); jtool.add(unite); jtool.add(cut); open.addActionListener(this); delete.addActionListener(this); unite.addActionListener(this); cut.addActionListener(this); JPanel jl = new JPanel(); jl.add(list); JPanel panelMain = new JPanel(); panelMain.setLayout(new BorderLayout()); panelMain.add(jtool,BorderLayout.NORTH); panelMain.add(jl,BorderLayout.SOUTH); getContentPane().add(panelMain); pack(); this.setResizable(false); this.setLocation(300, 300); } JButton open = new JButton("open"); JButton delete = new JButton("delete"); JButton unite = new JButton("unite"); JButton cut = new JButton("cut"); List list = new List(10); public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub /** * 点击打开时的动作 */ if(e.getSource() == open){ String inFileName = null; try{ JFileChooser openChooser=new JFileChooser("."); openChooser.showOpenDialog(this); inFileName = openChooser.getSelectedFile().getName(); }catch(Exception e1){ e1.printStackTrace(); return; } if(inFileName == null) return; String[] a = list.getItems(); int flag = 1; for(int i = 0; i < a.length; i ++){ if(a[i].equals(inFileName)) flag = 0; } if ( flag == 1 ) list.add(inFileName); else { java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件已经添加！", "Inane error", JOptionPane.ERROR_MESSAGE); } } /** * 点击删除的动作 */ if(e.getSource() == delete){ int i = -1; i = list.getSelectedIndex(); if (i != -1) list.remove(i); } /** * 点击合并的动作 */ if(e.getSource() == unite){ String in = JOptionPane.showInputDialog(this, "您想要创建的文件名！"); //判断文件名是否合法 if(!JubgeFileName.isValidName(in)){ java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件名不合法！", "Inane error", JOptionPane.ERROR_MESSAGE); return; } String fileName = in + ".hcr"; //判断文件是否已经存在 File file = new File(fileName); if(!file.exists()){ if(in != null){ try{ file.createNewFile(); }catch(IOException ee){ ee.printStackTrace(); } String[] a = list.getItems(); //写入文件数 AppendToFile.append(fileName,String.valueOf(a.length)+"\n"); String md5Value; for(int i = 0; i < a.length; i ++ ){ //文件名 AppendToFile.append(fileName, a[i]+"\n"); //字节数 File fa = new File(a[i]); AppendToFile.append(fileName,String.valueOf(fa.length())+"\n"); md5Value=MD5HashUtil.MD5HashUtilMain(a[i]); AppendToFile.append(fileName,md5Value+"\n"); } //跳過LENGTH字節写入各个文件内容 RandomAccessFile randomFile = null; InputStream small = null; try{ randomFile = new RandomAccessFile(fileName, "rw"); randomFile.seek(LENGTH); }catch (IOException e1) { e1.printStackTrace(); } for(int i = 0; i < a.length;i ++){ File f = new File(a[i]); try { small = new FileInputStream(f); int tempbyte; while((tempbyte=small.read()) != -1){ randomFile.write(tempbyte); } } catch (IOException e1) { e1.printStackTrace(); } } try{ small.close(); }catch (IOException e1) { e1.printStackTrace(); } } java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件成功合并！", "Inane success", JOptionPane.INFORMATION_MESSAGE ); } else{ java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件已经存在！", "Inane warning", JOptionPane.WARNING_MESSAGE); } } /** * 点击分割的动作 */ if(e.getSource() == cut){ String outFileName = null; try{ JFileChooser cutChooser=new JFileChooser("."); cutChooser.showOpenDialog(this); outFileName=cutChooser.getSelectedFile().getName(); }catch(Exception e1){ e1.printStackTrace(); return; } if(outFileName == null) return; if (!outFileName.contains(".hcr")){ java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "不能分开此类型的文件！", "Inane error", JOptionPane.ERROR_MESSAGE); return; } int fileNum = 0; fileNum = Integer.parseInt(ReadFromFile.readFileEveryLines(outFileName, 1)); if(fileNum == 0){ java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "此文件已损坏！", "Inane error", JOptionPane.ERROR_MESSAGE); return; } //新建文件夹 File myFilePath = new java.io.File(folderPath); try { if(myFilePath.isDirectory()) { java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件夹已经存在！", "Inane warning", JOptionPane.WARNING_MESSAGE); return; } else { myFilePath.mkdir(); } }catch (Exception e2) { e2.printStackTrace(); } String[] fileName = new String[fileNum]; long[] fileLength = new long[fileNum]; String[] md5Value = new String[fileNum]; int j = 0; long front=0; for(int i = 2;i <= 3*fileNum; i ++){ //得到文件名 fileName[j] = ReadFromFile.readFileEveryLines(outFileName, i); //得到文件长度 fileLength[j] = Long.valueOf(ReadFromFile.readFileEveryLines(outFileName, i+1)); //得到MD5值 md5Value[j] = ReadFromFile.readFileEveryLines(outFileName, i+2); File file = new File(folderPath,fileName[j]); if(file.exists()){ java.awt.Toolkit.getDefaultToolkit().beep(); JOptionPane.showMessageDialog(null, "文件已经存在！", "Inane warning", JOptionPane.WARNING_MESSAGE); return; } //写入各个文件内容 int n=0; if(j==0) front = LENGTH; else front = front + fileLength[j-1]; RandomAccessFile randomFile = null; File f = new File(outFileName); InputStream in = null; try { // 一次读一个字节 in = new FileInputStream(f); randomFile = new