哈工大java实验 文件分割与合并

我学到最多的是布局，太厉害啦，这个GridBagLayout和GridBagConstraints加起来就是无敌啊。

GridBagLayout bag = new GridBagLayout();GridBagConstraints c = new GridBagConstraints();                setLayout(bag);c.weightx = 1;                c.weighty = 1; /* 按行网格布局 */setCons(0, 0, 1, 1);this.add(label[0], c);                setCons(1, 0, 3, 1);this.add(text[0], c);                setCons(4, 0, 1, 1);this.add(button[0], c);

类似这种布局，比那个setBounds强多了。不过这个东西有个拿捏不好的地方，就是你的实际大小和网格的分配要弄好，不然就挤成一坨了。
我学到次多就是JTextField的监听，它和别的组件的监听不一样。
用的时候只要
text[2].addKeyListener(new TextFieldKeyListener());
就行了。

class TextFieldKeyListener implements KeyListener {public void keyTyped(KeyEvent e) {Object o = e.getSource();if (o instanceof JTextField) {char keyCh = e.getKeyChar();Pattern pat = Pattern.compile("[0-9]");if (!pat.matcher(String.valueOf(keyCh)).matches()) {if (keyCh != ' ') // 回车字符e.setKeyChar('\0');}}}public void keyPressed(KeyEvent arg0) {}public void keyReleased(KeyEvent arg0) {String temp = text[2].getText();if (temp.length() != 0) {blockSize = Integer.parseInt(text[2].getText()) * 1024;doGiveMsg();}}}

我学到的第三就是RandomAccessFile读，写文件，按字节。


一般就是
RandomAcceffFile in=new RandomAccessFile(srcFile);
RandomAcceffFile out=new RandomAccessFile(targetFile);
byte bytes[]=new byte[1024];
in.read(bytes);
out.write(bytes);
in.close();
out.close();
上面那个是手打的。。意思就是把srcFile中的1024个bytes读出来防止bytes中，再将bytes写到targetFile中。

实际操作可以参考下面的FileCut中的run()函数。一般都会有
in.seek();

進度條這種東西竟然java也有：

/* JProgressBar */bar.setOrientation(JProgressBar.HORIZONTAL);bar.setMinimum(0);bar.setMaximum(100);bar.setValue(0);bar.setStringPainted(true);bar.addChangeListener(this);bar.setPreferredSize(new Dimension(300, 20));bar.setBorderPainted(true);bar.setBackground(Color.white);

用的時候如上即可，其中

setPerferredSize()方法 是設置大小，而不是setSize(); 

setBorderPainted(true);繪製邊框

setStringPainted(true) ; 顯示字符

setOrientation(JProgressBar.HORIZONTAL); 水平顯示

進度控制：

int  progress=0;

bar.setValue(progress);

對於進度條的監聽，也不太一樣：

bar.addChangeListener(this);

java里面的List和Arrays.sort();都让我很惊奇，能够很方便的操作。这些以前我都不知道。。。

最後貼出全部代碼：

package ouyang;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.io.File;import java.io.RandomAccessFile;import java.util.ArrayList;import java.util.Arrays;import java.util.Comparator;import java.util.List;import java.util.Vector;import java.util.regex.Pattern;import javax.swing.*;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;public class FileCutter {public static void main(String args[]) {CutterFrame frame = new CutterFrame();frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}}class CutterFrame extends JFrame {/** *  */private static final long serialVersionUID = 1L;public CutterFrame() {setTitle("File Cut and Merge");setSize(500, 600);JTabbedPane tab = new JTabbedPane();CutPanel cut = new CutPanel();MergePanel merge = new MergePanel();tab.add(cut, "File cutter");tab.add(merge, "File merger");add(tab);}/* CutterFrame 中的子类CutPanel用来存放cut面板 */class CutPanel extends JPanel implements ActionListener, ChangeListener {/** *  */private static final long serialVersionUID = 1L;JLabel label[] = new JLabel[6];ButtonGroup bg = new ButtonGroup();JRadioButton radio[] = new JRadioButton[5];JButton button[] = new JButton[3];JProgressBar bar = new JProgressBar();JTextField text[] = new JTextField[5];File srcFile, targetFile;int blockSize = (int) (1.44 * 1024 * 1024 + 0.5);int number = 0;boolean flag = false;GridBagLayout bag = new GridBagLayout();GridBagConstraints c = new GridBagConstraints();private boolean srcFlag = false;public CutPanel() {drawCutPanel();initCutPanel();addListener();}public void setCons(int x, int y, int width, int height) {c.gridx = x;c.gridy = y;c.gridwidth = width;c.gridheight = height;}public void drawCutPanel() {label[0] = new JLabel("File Name:");label[1] = new JLabel("File Size:");label[2] = new JLabel("Blocks Size:");label[3] = new JLabel("KB");label[4] = new JLabel("Number of blocks:");label[5] = new JLabel("Target file:");text[0] = new JTextField(20);text[1] = new JTextField(20);text[2] = new JTextField(5);text[3] = new JTextField(5);text[4] = new JTextField(20);radio[0] = new JRadioButton("1.44MB");radio[1] = new JRadioButton("1.2MB");radio[2] = new JRadioButton("720KB");radio[3] = new JRadioButton("360KB");radio[4] = new JRadioButton("Self defined:");button[0] = new JButton("...");button[1] = new JButton("...");button[2] = new JButton("Cut Start:");/* 设置布局格式 */setLayout(bag);c.weightx = 1;c.weighty = 1;/* 按行网格布局 */setCons(0, 0, 1, 1);this.add(label[0], c);setCons(1, 0, 3, 1);this.add(text[0], c);setCons(4, 0, 1, 1);this.add(button[0], c);setCons(0, 1, 1, 1);this.add(label[1], c);setCons(1, 1, 3, 1);this.add(text[1], c);setCons(4, 1, 1, 1);this.add(button[1], c);setCons(0, 2, 1, 1);this.add(label[2], c);setCons(1, 2, 1, 1);this.add(radio[0], c);setCons(2, 2, 1, 1);this.add(radio[1], c);setCons(1, 3, 1, 1);this.add(radio[2], c);setCons(2, 3, 1, 1);this.add(radio[3], c);setCons(1, 4, 1, 1);this.add(radio[4], c);setCons(2, 4, 1, 1);this.add(text[2], c);setCons(3, 4, 1, 1);this.add(label[3], c);setCons(0, 5, 1, 1);this.add(label[4], c);setCons(1, 5, 1, 1);this.add(text[3], c);setCons(0, 6, 1, 1);this.add(label[5], c);setCons(1, 6, 3, 1);this.add(text[4], c);setCons(4, 6, 3, 1);this.add(button[1], c);setCons(0, 7, 1, 1);this.add(button[2], c);setCons(1, 7, 5, 1);this.add(bar, c);}public void initCutPanel() {/* 面板小细节 */for (int i = 0; i < 5; i++)text[i].setEditable(false);for (int i = 0; i < 5; i++)bg.add(radio[i]);/* JProgressBar */bar.setOrientation(JProgressBar.HORIZONTAL);bar.setMinimum(0);bar.setMaximum(100);bar.setValue(0);bar.setStringPainted(true);bar.addChangeListener(this);bar.setPreferredSize(new Dimension(300, 20));bar.setBorderPainted(true);bar.setBackground(Color.white);}public void addListener() {/* 监听器 */for (int i = 0; i < 3; i++)button[i].addActionListener(this);for (int i = 0; i < 5; i++)radio[i].addActionListener(this);/* text[2]的监听不太一样 */text[2].addKeyListener(new TextFieldKeyListener());}/* 子类TextFieldKeyListener是用来监听JTextField的 */class TextFieldKeyListener implements KeyListener {public void keyTyped(KeyEvent e) {Object o = e.getSource();if (o instanceof JTextField) {char keyCh = e.getKeyChar();Pattern pat = Pattern.compile("[0-9]");if (!pat.matcher(String.valueOf(keyCh)).matches()) {if (keyCh != ' ') // 回车字符e.setKeyChar('\0');}}}public void keyPressed(KeyEvent arg0) {}public void keyReleased(KeyEvent arg0) {String temp = text[2].getText();if (temp.length() != 0) {blockSize = Integer.parseInt(text[2].getText()) * 1024;doGiveMsg();}}}public void doGiveMsg() {if (srcFlag) {int temp2 = (int) (srcFile.length());number = (temp2 >= blockSize) ? (int) ((double) temp2/ blockSize + 0.99) : 1;text[3].setText(String.valueOf(number));}}public void actionPerformed(ActionEvent e) {if (e.getSource() == button[0]) {JFileChooser fc = new JFileChooser("d:\\");int val = fc.showOpenDialog(null);if (0 == val) {srcFile = fc.getSelectedFile();/* 为防止出错，targetFile默认路径设为同目录下 */targetFile = srcFile.getParentFile();text[0].setText(srcFile.getPath());text[1].setText(String.valueOf((int) ((double) srcFile.length() / 1024 + 0.5)) + " KB");srcFlag = true;}} else if (e.getSource() == radio[0]) {blockSize = (int) (1.44 * 1024 * 1024 + 0.5);text[2].setEditable(false);text[2].setText(null);doGiveMsg();} else if (e.getSource() == radio[1]) {blockSize = (int) (1.2 * 1024 * 1024 + 0.5);text[2].setEditable(false);text[2].setText(null);doGiveMsg();} else if (e.getSource() == radio[2]) {blockSize = 720 * 1024;text[2].setEditable(false);text[2].setText(null);doGiveMsg();} else if (e.getSource() == radio[3]) {blockSize = 360 * 1024;text[2].setEditable(false);text[2].setText(null);doGiveMsg();} else if (e.getSource() == radio[4]) {text[2].setEditable(true);doGiveMsg();} else if (e.getSource() == button[1]) {JFileChooser fc = new JFileChooser("d:\\");fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);int val = fc.showOpenDialog(null);if (0 == val) {targetFile = fc.getSelectedFile();text[4].setText(targetFile.getPath());}} else if (e.getSource() == button[2]) {FileCut cut = new FileCut();cut.run();}}/* CutPanel 中的子类FileCut用来处理cut面板 */class FileCut extends Thread {public void run() {int temp = 0;try {RandomAccessFile in = new RandomAccessFile(srcFile, "r");for (int i = 0; i < number - 1; i++) {File outFile = new File(targetFile, srcFile.getName()+ "_part_" + ((i < 10) ? ("0" + i) : i));RandomAccessFile out = new RandomAccessFile(outFile,"rw");byte bytes[] = new byte[blockSize];in.read(bytes);out.write(bytes);out.close();temp += blockSize;in.seek(temp);int progress = 100 / number * (i + 1);bar.setValue(progress);}File lastOutFile = new File(targetFile, srcFile.getName()+ "_part_" + (number - 1));RandomAccessFile outt = new RandomAccessFile(lastOutFile,"rw");byte bytes[] = new byte[(int) (srcFile.length() - temp)];in.read(bytes);outt.write(bytes);bar.setValue(100);in.close();} catch (Exception e) {System.out.println("File Exception!");}}}@Overridepublic void stateChanged(ChangeEvent e) {// TODO Auto-generated method stub}}/* CutterFrame 中的子类MergePanel用来存放merge面板 */class MergePanel extends JPanel implements ActionListener, ChangeListener {JLabel label[] = new JLabel[4];JButton button[] = new JButton[4];JProgressBar bar = new JProgressBar();JTextField text[] = new JTextField[3];JTextArea area;List mergeFileList;JScrollPane scroll;GridBagLayout bag;GridBagConstraints c;File srcFile, targetFile;int number = 0;int blockSize = 0;File[] fileList;public MergePanel() {drawMergePanel();initMergePanel();addListener();}public void setCons(int x, int y, int width, int height) {c.gridheight = height;c.gridx = x;c.gridy = y;c.gridwidth = width;}public void drawMergePanel() {label[0] = new JLabel("File Name:");label[1] = new JLabel("Files to be merge:");label[2] = new JLabel("Number of files:");label[3] = new JLabel("Targer file:");button[0] = new JButton("...");button[1] = new JButton("Remove");button[2] = new JButton("Clear");button[3] = new JButton("Start merging");bar = new JProgressBar();text[0] = new JTextField(20);text[1] = new JTextField(10);text[2] = new JTextField(20);area = new JTextArea(10, 30);scroll = new JScrollPane(area);bag = new GridBagLayout();c = new GridBagConstraints();this.setLayout(bag);c.weightx = 1;c.weighty = 1;setCons(0, 0, 1, 1);this.add(label[0], c);setCons(1, 0, 3, 1);this.add(text[0], c);setCons(4, 0, 1, 1);this.add(button[0], c);setCons(0, 1, 1, 1);this.add(label[1], c);setCons(1, 2, 5, 3);this.add(scroll, c);// setCons(1,2,5,3);// this.add(area,c);setCons(0, 7, 1, 1);this.add(label[2], c);setCons(1, 7, 1, 1);this.add(text[1], c);setCons(1, 8, 1, 1);this.add(button[1], c);setCons(2, 8, 1, 1);this.add(button[2], c);setCons(0, 9, 1, 1);this.add(label[3], c);setCons(1, 9, 3, 1);this.add(text[2], c);setCons(0, 10, 1, 1);this.add(button[3], c);setCons(1, 10, 4, 1);this.add(bar, c);}public void initMergePanel() {text[0].setEditable(false);text[2].setEditable(false);area.setEditable(false);// 分别设置水平和垂直滚动条自动出现scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);mergeFileList = new ArrayList<String>();/* JProgressBar */bar.setOrientation(JProgressBar.HORIZONTAL);bar.setMinimum(0);bar.setMaximum(100);bar.setValue(0);bar.setStringPainted(true);bar.addChangeListener(this);bar.setPreferredSize(new Dimension(300, 20));bar.setBorderPainted(true);bar.setBackground(Color.white);}public void addListener() {for (int i = 0; i < 4; i++)button[i].addActionListener(this);}public void actionPerformed(ActionEvent e) {if (e.getSource() == button[0]) {JFileChooser fc = new JFileChooser("d:\\");fc.setMultiSelectionEnabled(true);int val = fc.showOpenDialog(null);if (0 == val) {fileList = fc.getSelectedFiles();text[0].setText(String.valueOf(fileList[0].getName()));Arrays.sort(fileList);for (int i = 0; i < fileList.length; i++) {mergeFileList.add(fileList[i]);}doGiveMsg();String a[] = fileList[0].getName().split("_");String tFile = a[0];targetFile = new File(fileList[0].getParentFile().getPath(), tFile);text[2].setText(tFile);}} else if (e.getSource() == button[1]) {String temp = text[1].getText();if (temp.equals("")) {JOptionPane.showMessageDialog(null, "没有选中文件!");} else {int index = Integer.parseInt(text[1].getText());mergeFileList.remove(index);doGiveMsg();}} else if (e.getSource() == button[2]) {if (area.getText().equals("")) {JOptionPane.showMessageDialog(null, "没有文件!");} else {mergeFileList.clear();doGiveMsg();}} else if (e.getSource() == button[3]) {if (!area.getText().equals("")) {FileMerge merge = new FileMerge();merge.run();} else {JOptionPane.showMessageDialog(null, "没有可以合并的文件!");}}}public void doGiveMsg() {String tempArea = "";for (int i = 0; i < mergeFileList.size(); i++) {tempArea += (i + 1) + " " + mergeFileList.get(i) + "\n";}area.setText(tempArea);}@Overridepublic void stateChanged(ChangeEvent arg0) {// TODO Auto-generated method stub}/* MergePanel 中的子类FileMerge用来处理merge面板 */class FileMerge extends Thread {public void run() {int temp = 0;try {RandomAccessFile out = new RandomAccessFile(targetFile,"rw");for (int i = 0; i < fileList.length; i++) {System.out.println("Processing..." + i);RandomAccessFile in = new RandomAccessFile(fileList[i],"r");int len = (int) fileList[i].length();byte bytes[] = new byte[len];in.read(bytes);out.write(bytes);in.close();int progress = 100 / fileList.length * (i + 1);bar.setValue(progress);}out.close();bar.setValue(100);} catch (Exception e) {System.out.println("File Exception!");}}}}}