java 文字类型文件转换编码

来源：互联网发布：js中事件的概念编辑：程序博客网时间：2024/06/06 04:24

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.LinkedList;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author 夏天的暴风雨
*/
public class TranslateFileEncode {

 final String ASC = "gb2312";
 final String UTF8 = "UTF-8";
 final String UTF16L = "UTF-16LE";
 final String UTF16B = "UTF-16BE";

 private Vector fileVector; //需要转换的文件列表
 private String sourceEncode = ASC; //源文件Encode
 private String dstEncode = UTF8; //目标文件Encode
 private boolean hasBOM = false; //源文件是否有BOM标记
 private boolean writeBOM = false; //是否向新文件的文件头写入BOM
 private String fileSuffix = ".java"; //要搜索的文件类型后缀

 /**
 * @param args the command line arguments
 */
 public String getFileEncode(File file) {
 if (file.length() < 2) {
 return ASC;
 }
 //开始查找
 try {
 InputStream fis = new FileInputStream(file);
 if (!fis.markSupported()) {
 fis = new BufferedInputStream(fis);
 }
 fis.mark(3);
 byte[] byteBOM = new byte[3];
 fis.read(byteBOM, 0, 3);
 if (byteBOM[0] == (byte) 0xFF && byteBOM[1] == (byte) 0xFE) {
 hasBOM = true;
 fis.close();
 return UTF16L;
 }
 if (byteBOM[0] == (byte) 0xFE && byteBOM[1] == (byte) 0xFF) {
 hasBOM = true;
 fis.close();
 return UTF16B;
 }
 if (byteBOM[0] == (byte) 0xEF && byteBOM[1] == (byte) 0xBB && byteBOM[2] == (byte) 0xBF) {
 hasBOM = true;
 fis.close();
 return UTF8;
 }
 fis.reset();
 int read;
 while ((read = fis.read()) != -1) {
 if (read >= 0xF0) {
 break;
 }
 if (0x80 <= read && read <= 0xBF) // 单独出现BF以下的，也算是GBK
 {
 break;
 }
 if (0xC0 <= read && read <= 0xDF) {
 read = fis.read();
 if (0x80 <= read && read <= 0xBF) // 双字节 (0xC0 - 0xDF) (0x80 - 0xBF),也可能在GB编码内
 {
 continue;
 } else {
 break;
 }
 } else if (0xE0 <= read && read <= 0xEF) {// 也有可能出错，但是几率较小
 read = fis.read();
 if (0x80 <= read && read <= 0xBF) {
 read = fis.read();
 if (0x80 <= read && read <= 0xBF) {
 fis.close();
 return UTF8;
 } else {
 break;
 }
 } else {
 break;
 }
 }
 }

 fis.close();
 } catch (Exception e) {
 e.printStackTrace();
 }

 //没有找到匹配的，默认返回本地字符集
 return ASC;
 }

 public void TranslateFileEncode(File sourceFile) {
 try {

 //检查文件对象是否有效
 if (sourceFile == null) {
 return;
 }

 //将源文件改名备份,并建立目标文件
 String fileName = sourceFile.getAbsolutePath();
 sourceFile.renameTo(new File(fileName + "_bak"));
 sourceFile = new File(fileName + "_bak");
 File dstFile = new File(fileName);
 dstFile.createNewFile();

 //根据源文件编码读入到文件字符串
 sourceEncode = getFileEncode(sourceFile);
 FileInputStream fis = new FileInputStream(sourceFile);
 int fileSize = fis.available();
 if (hasBOM) {
 if (sourceEncode == UTF16L || sourceEncode == UTF16B) {
 fis.skip(2);
 fileSize -= 2;
 } else if (sourceEncode == UTF8) {
 fis.skip(3);
 fileSize -= 3;
 }
 }
 byte[] buffer = new byte[fileSize];
 fis.read(buffer);
 fis.close();
 String fileStr = new String(buffer, sourceEncode);

 //根据目标文件编码生成对应的byte数组并写入文件
 byte[] writeBytes = fileStr.getBytes(dstEncode);
 FileOutputStream fos = new FileOutputStream(dstFile);
 if (writeBOM) {
 if (dstEncode == UTF16L) {
 fos.write(0xFF);
 fos.write(0xFE);
 } else if (dstEncode == UTF16B) {
 fos.write(0xFE);
 fos.write(0xFF);
 } else if (dstEncode == UTF8) {
 fos.write(0xEF);
 fos.write(0xBB);
 fos.write(0xBF);
 }
 }
 fos.write(writeBytes);

 fos.close();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

 public void addFileAsFilter(File folder) {
 File files[] = folder.listFiles();
 LinkedList<File> listFolder = new LinkedList<>();
 for (File file : files) {
 if (file.isDirectory()) {
 listFolder.add(file);
 } else if ((fileSuffix.equals("AllFile")) || file.getName().endsWith(fileSuffix)) {
 fileVector.add(file);
 }
 }
 File tmp;
 while (!listFolder.isEmpty()) {
 tmp = listFolder.removeFirst();
 if (tmp.isDirectory()) {
 files = tmp.listFiles();
 if (files == null) {
 continue;
 }
 for (File file : files) {
 if (file.isDirectory()) {
 listFolder.add(file);
 } else if ((fileSuffix.equals("AllFile")) || file.getName().endsWith(fileSuffix)) {
 fileVector.add(file);
 }
 }
 }
 }
 }

 public void createFrame(JFrame frame) {
 frame.setTitle("批量转换文件编码 By:夏天的暴风雨 2016");
 frame.setSize(800, 600);
 frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 Dimension displaySize = Toolkit.getDefaultToolkit().getScreenSize();
 Dimension frameSize = frame.getSize();
 if (frameSize.width > displaySize.width) {
 frameSize.width = displaySize.width;
 }
 if (frameSize.height > displaySize.height) {
 frameSize.height = displaySize.height;
 }
 int x = (displaySize.width - frameSize.width) / 2;
 int y = (displaySize.height - frameSize.height) / 2;
 frame.setLocation(x, y);
 }

 public void addComponent(JFrame frame) {
 fileVector = new Vector();
 MyJList jl = new MyJList(fileVector);
 JScrollPane scrollPane = new JScrollPane(jl);
 frame.add(scrollPane, BorderLayout.CENTER);

 //窗口上面的控件
 JPanel northPane = new JPanel();
 frame.add(northPane, "North");
 //添加文件
 JButton addFile = new JButton("添加文件");
 addFile.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 JFileChooser fileChooser = new JFileChooser();
 fileChooser.setMultiSelectionEnabled(true);
 fileChooser.showDialog(fileChooser, "选择文件");
 File[] selectedFiles = fileChooser.getSelectedFiles();
 for (File file : selectedFiles) {
 fileVector.add(file);
 }
 jl.updateUI();
 }
 });
 northPane.add(addFile);
 //目标编码
 JLabel label = new JLabel("请选择目标编码:");
 northPane.add(label);
 String[] dstEndoeList = {UTF8, ASC, UTF16L, UTF16B};
 JComboBox dstEncodeComboBox = new JComboBox(dstEndoeList);
 northPane.add(dstEncodeComboBox);
 JCheckBox checkBox = new JCheckBox("写入BOM标记");
 String tipBOM = "<html>" + "" + "BOM就是文件开头的文件类型标记" + ""
 + "" + "UTF8(BOM)---->UTF8(无BOM)可以用来清除BOM" + ""
 + "" + "UNICODE必须带BOM,否则读取的时候会出错" + "" + "</html>";
 checkBox.setToolTipText(tipBOM); //setToolTipText()不支持多行字符串，只能用HTML语言来进行多行的描述
 northPane.add(checkBox);
 dstEncodeComboBox.addItemListener(new ItemListener() {
 public void itemStateChanged(ItemEvent e) {
 if (e.getStateChange() == ItemEvent.SELECTED) //该时间会触发两次，一次为取消旧的，一次为选择新的
 {
 dstEncode = e.getItem().toString(); //我们用选择新的事件的Item
 if (dstEncode == UTF16L || dstEncode == UTF16B) {
 checkBox.setSelected(true);
 checkBox.setEnabled(false);
 } else {
 checkBox.setEnabled(true);
 if (dstEncode == ASC) {
 checkBox.setSelected(false);
 checkBox.setEnabled(false);
 }
 }
 }
 }
 });
 checkBox.addItemListener(new ItemListener() {
 public void itemStateChanged(ItemEvent e) {
 if (e.getStateChange() == ItemEvent.SELECTED) {
 writeBOM = true;
 } else if (e.getStateChange() == ItemEvent.DESELECTED) {
 writeBOM = false;
 }
 }
 });

 //窗口下面的控件
 JPanel southPane = new JPanel();
 frame.add(southPane, "South");
 //选择文件夹
 JButton openFolder = new JButton("搜索整个文件夹并添加");
 openFolder.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 fileVector.clear();
 JFileChooser fileChooser = new JFileChooser();
 fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
 fileChooser.setMultiSelectionEnabled(true);
 fileChooser.showDialog(fileChooser, "选择文件夹");
 File[] selectedFolders = fileChooser.getSelectedFiles();
 for (File file : selectedFolders) {
 addFileAsFilter(file);
 }
 jl.updateUI();
 }
 });
 southPane.add(openFolder);
 //过滤类型
 JLabel filterLabel = new JLabel("搜索类型:");
 southPane.add(filterLabel);
 String[] filterStr = {".java", ".html", ".txt", ".c", ".cpp", "AllFile"};
 JComboBox filterComboBox = new JComboBox(filterStr);
 filterComboBox.addItemListener(new ItemListener() {
 public void itemStateChanged(ItemEvent e) {
 if (e.getStateChange() == ItemEvent.SELECTED) {
 fileSuffix = e.getItem().toString();
 }
 }
 });
 southPane.add(filterComboBox);
 //开始转换
 JButton begin = new JButton("开始转换");
 begin.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 for (int i = 0; i < fileVector.size(); i++) {
 TranslateFileEncode((File) fileVector.get(i));
 }
 fileVector.clear();
 jl.updateUI();
 JOptionPane.showMessageDialog(begin, "转换完成", "提示", JOptionPane.PLAIN_MESSAGE);
 }
 });
 southPane.add(begin);

 frame.pack();
 }

 public static void main(String[] args) {
 // TODO code application logic here
 TranslateFileEncode instance = new TranslateFileEncode();
 JFrame mainFrame = new JFrame();

 EventQueue.invokeLater(new Runnable() {
 public void run() {
 instance.createFrame(mainFrame);
 instance.addComponent(mainFrame);
 mainFrame.setVisible(true);
 }
 });
 }
}

----------------------------------------------------------------------------------------------------------------------------------

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Vector;
import javax.swing.JList;

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/

/**
*
* @author xk
*/
class MyJList extends JList implements DropTargetListener{

    Vector v;

    public MyJList(Vector v) {
        super(v);
        this.v = v;
        new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this);
    }

    @Override
    public void drop(DropTargetDropEvent dtde) {
        try {
            Transferable tr = dtde.getTransferable();
            if (dtde.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                ArrayList list = (ArrayList) (dtde.getTransferable().getTransferData(DataFlavor.javaFileListFlavor));
                Iterator it = list.iterator();
                while(it.hasNext()) {
                    File temp = (File) it.next();
                    if (temp.isFile())
                        v.add(temp);
                }
                this.updateUI();
                dtde.dropComplete(true);
            } else {
                dtde.rejectDrop();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void dragEnter(DropTargetDragEvent dtde) {

    }

    @Override
    public void dragExit(DropTargetEvent dte) {

    }

    @Override
    public void dragOver(DropTargetDragEvent dtde) {

    }

    @Override
    public void dropActionChanged(DropTargetDragEvent dtde) {

    }
}

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