[转]JAVA版文件MD5生成器
做文件传输的时候,为了保证文件是合法的有效的,经常会对文件做MD5校验,以确保和原始的文件是一样的.并且做断点续传的时候这一点也是挺重要的,其实JAVA处理这方面也挺不错的,可是我搜了半天,也没有搜到一个用JAVA写的文件MD5生成程序,有的也只是命令行模式下的,没有一个GUI模式的,所以就写了一个GUI的,方便使用,只用了两个类,一个是工具类,除了生成MD5外还可以生成SHA码,大家可以通过改源文件达到这一点,并且文件支持拖放,可以把要生成的文件拖到文本区,就可以显示这个文件的信息了./* * To change this template, choose Tools | Templates * and open the template in the editor. */package test1; import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.logging.Level;import java.util.logging.Logger;import javax.swing.JProgressBar;/** * * @author hadeslee */public final class Util { /** * 得到文件的MD5码,用于校验 * @param file * @param jpb * @return */ public static String getMD5(File file, JProgressBar jpb) { FileInputStream fis = null; jpb.setMaximum((int) file.length()); jpb.setValue(0); jpb.setString("正在计算:" + file.getName() + "的MD5值"); try { MessageDigest md = MessageDigest.getInstance("MD5"); fis = new FileInputStream(file); byte[] buffer = new byte; int length = -1; System.out.println("开始算"); int value = 0; while ((length = fis.read(buffer)) != -1) { md.update(buffer, 0, length); value += length; jpb.setValue(value); } System.out.println("算完了"); return bytesToString(md.digest()); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } finally { try { fis.close(); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); } } } /** * * @param file * @return */ public static String getMD5(File file) { FileInputStream fis = null; try { MessageDigest md = MessageDigest.getInstance("MD5"); fis = new FileInputStream(file); byte[] buffer = new byte; int length = -1; System.out.println("开始算"); while ((length = fis.read(buffer)) != -1) { md.update(buffer, 0, length); } System.out.println("算完了"); return bytesToString(md.digest()); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } finally { try { fis.close(); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); } } } /** * 得到文件的SHA码,用于校验 * @param file * @return */ public static String getSHA(File file) { FileInputStream fis = null; try { MessageDigest md = MessageDigest.getInstance("SHA"); fis = new FileInputStream(file); byte[] buffer = new byte; int length = -1; System.out.println("开始算"); while ((length = fis.read(buffer)) != -1) { md.update(buffer, 0, length); } System.out.println("算完了"); return bytesToString(md.digest()); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } finally { try { fis.close(); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); } } } /** * * @param file * @param jpb * @return */ public static String getSHA(File file,JProgressBar jpb) { FileInputStream fis = null; jpb.setMaximum((int) file.length()); jpb.setValue(0); jpb.setString("正在计算:" + file.getName() + "的MD5值"); try { MessageDigest md = MessageDigest.getInstance("SHA"); fis = new FileInputStream(file); byte[] buffer = new byte; int length = -1; System.out.println("开始算"); int value=0; while ((length = fis.read(buffer)) != -1) { md.update(buffer, 0, length); value+=length; jpb.setValue(value); } System.out.println("算完了"); return bytesToString(md.digest()); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); return null; } finally { try { fis.close(); } catch (IOException ex) { Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex); } } } public static String bytesToString(byte[] data) { char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; char[] temp = new char; for (int i = 0; i < data.length; i++) { byte b = data; temp = hexDigits; temp = hexDigits; } return new String(temp); } public static void main(String[] args) { String s = System.getProperties().getProperty("java.io.tmpdir"); System.out.println(s); }}
窗体的代码:
* * Main.java * * Created on 2007年11月8日, 上午9:15 */package test1;import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.Transferable;import java.awt.datatransfer.UnsupportedFlavorException;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.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import javax.swing.JFileChooser;import javax.swing.UIManager;/** * * @authorhadeslee */public class Main extends javax.swing.JFrame implements DropTargetListener { private JFileChooser jfc; private File toMd5; private DropTarget dt; /** Creates new form Main */ public Main() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception exe) { exe.printStackTrace(); } initComponents(); initOther(); this.setLocationRelativeTo(null); } private void initOther() { dt = new DropTarget(jTextArea1, DnDConstants.ACTION_COPY_OR_MOVE, this); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); jButton1 = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); jButton2 = new javax.swing.JButton(); jButton3 = new javax.swing.JButton(); jpb = new javax.swing.JProgressBar(); jLabel2 = new javax.swing.JLabel(); jTextField2 = new javax.swing.JTextField(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("MD5生成"); setResizable(false); jLabel1.setText("文件路径:"); jTextField1.setEditable(false); jButton1.setText("浏览"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jScrollPane1.setBorder(javax.swing.BorderFactory.createTitledBorder("文件信息")); jTextArea1.setColumns(20); jTextArea1.setRows(5); jScrollPane1.setViewportView(jTextArea1); jButton2.setText("生成"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); jButton3.setText("退出"); jButton3.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton3ActionPerformed(evt); } }); jLabel2.setText("MD5值:"); jTextField2.setEditable(false); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup(layout.createSequentialGroup() .addComponent(jButton2) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton3) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jpb, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addGroup(layout.createSequentialGroup() .addComponent(jLabel2) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jTextField2)) .addComponent(jScrollPane1) .addGroup(layout.createSequentialGroup() .addComponent(jLabel1) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 246, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton1))) .addContainerGap(16, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton1)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 182, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel2) .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 11, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER) .addComponent(jButton3) .addComponent(jpb, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addContainerGap()) .addGroup(layout.createSequentialGroup() .addGap(267, 267, 267) .addComponent(jButton2) .addGap(10, 10, 10)) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: if (jfc == null) { jfc = new JFileChooser(); jfc.setFileSelectionMode(JFileChooser.FILES_ONLY); } if (jfc.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) { toMd5 = jfc.getSelectedFile(); jTextField1.setText(toMd5.toString()); showFileInfo(); } } private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: jButton2.setEnabled(false); new Thread(){ public void run(){ String s=Util.getMD5(toMd5, jpb); jTextField2.setText(s); jButton2.setEnabled(true); } }.start(); } private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: System.exit(0); } private void showFileInfo() { if (toMd5 != null) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss"); File f = toMd5; StringBuilder sb = new StringBuilder(); sb.append("文件名称:").append(f.getName()).append('\n'); sb.append("文件大小:").append(f.length()).append('\n'); sb.append("文件最后修改日期:").append(sdf.format(new Date(f.lastModified()))).append("\n"); sb.append("文件属性:").append(f.canWrite() ? "读写" : "只读").append('\n'); jTextArea1.setText(sb.toString()); } } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Main().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JButton jButton3; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextArea jTextArea1; private javax.swing.JTextField jTextField1; private javax.swing.JTextField jTextField2; private javax.swing.JProgressBar jpb; // End of variables declaration public void dragEnter(DropTargetDragEvent dtde) { dtde.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE); } public void dragOver(DropTargetDragEvent dtde) { } public void dropActionChanged(DropTargetDragEvent dtde) { } public void dragExit(DropTargetEvent dte) { } public void drop(DropTargetDropEvent e) { try { if (e.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) { Transferable tr = e.getTransferable(); e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE); @SuppressWarnings("unchecked") java.util.List<File> list = (java.util.List<File>) tr.getTransferData(DataFlavor.javaFileListFlavor); if (list.size() == 1) { File f = list.get(0); if (f.isFile()) { toMd5 = list.get(0); this.showFileInfo(); jTextField1.setText(toMd5.toString()); } } e.dropComplete(true); }else { e.rejectDrop(); } } catch ( IOException io) { io.printStackTrace(); e.rejectDrop(); } catch ( UnsupportedFlavorException ufe) { ufe.printStackTrace(); e.rejectDrop(); } }}
0x0f什么意思?
０ｘ的意思就是１６进制数（别告诉我这都不知道） 0f=15，所以０ｘ０ｆ就是表示一个１６进制的数字，值１５ char *pattern表示的是一个数组指针，就是一个８个大小的数组，成员都是ｃｈａｒ＊指针 所以总的来说就是给一个ｃｈａｒ＊ 数组赋值，初始化为０ｘ０ｆ
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