签名文件签名(java代码)

package encryptdecrypt;import j ava.awt.event.ActionEvent;import j ava.awt.event.ActionListener;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.Obj ectInputStream;import java.io.Obj ectOutputStream;import java.security.KeyPair;import java.security.KeyPairGenerator;import j ava.security.PrivateKey;import java.security.PublicKey;import javax.swing.JFileChooser;import javax.swing.JFrame;import j avax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import j avax.swing.JTextArea;import javax.swing.ScrollPaneConstants;public class FileSignature {

/**

*@param args

*/public static void main(String[]args) {

//TODO Auto-generated method stub

DemoWindow5 dw=new DemoWindow5("文件签名签 ");dw.setBounds(dw.getToolkit().getScreenSize().width/3,dw.getToolkit()

.getScreenSize().height/3,

dw.getToolkit().getScreenSize().width/3,dw.getToolkit()

.getScreenSize().height/3);dw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);dw.setVisible(true);

}

}class DemoWindow5 extends JFrame implements ActionListener {

JMenuBar menuBar=new JMenuBar();

JMenu fileMenu=new JMenu("文件");

JMenuItem openMenuItem=new JMenuItem("打签文签件签 ");

JMenuItem saveMenuItem=new JMenuItem("保存文件");

JMenu signMenu=new JMenu("签名签签");

JMenuItem validateItem=new JMenuItem("签签文件");

JTextArea jta=new JTextArea();int v=S crollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;int h=S crollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;JScrollPane jsp=new JScrollPane(jta,v,h);public DemoWindow5(String title) {super(title);fileMenu.add(openMenuItem);fileMenu.add(saveMenuItem);signMenu.add(generateItem);signMenu.add(signItem);signMenu.add(validateItem);menuBar.add(fileMenu);menuBar.add(signMenu);this.setJMenuBar(menuBar);add(jsp);openMenuItem.addActionListener(this);saveMenuItem.addActionListener(this);generateItem.addActionListener(this);signItem.addActionListener(this);validateItem.addActionListener(this);

}public void actionPerformed(ActionEvent e) {

//TODO Auto-generated method stubif(e.getSource()==openMenuItem) {openFile();

}else if(e.getSource()==saveMenuItem) {

saveFile();

}else if(e.getSource()==generateItem) {generateKeys();

}else if(e.getSource()==signItem) {sign();

}else if(e.getSource()==validateItem) {validateSign();

}

}public void openFile() {

String fileName=null;

//System.getProperty("user.dir")是签得签用签签签当前签的签工签作签签目签;//如果签签中签签取签签签的签文签件签的签完签整签路签径签if(jfc.showOpenDialog(this)==JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();

System.out.println(fileName);

}if(fileName==null)return;try{

FileInputStream fis=new FileInputStream(fileName);byte[] text=new byte[fis.available()];fis.read(text);fis.close();jta.setText(new String(text));

}catch(Exception e1) {e1.printStackTrace();

}

}public void saveFile() {

String fileName=null;

));if(j fc.showSaveDialog(this)==JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();

}if(fileName==null)

return;try{

FileOutputStream fos=new FileOutputStream(fileName,false);fos.write(jta.getText().getBytes());fos.close();

}catch(Exception e1) {e1.printStackTrace();

}

}public void generateKeys() {try{

String fileName=null;

jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);if(jfc.showSaveDialog(this)==

JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();

}if(fileName==null)return;

File file=new File(fileName);if(!file.exists()) {file.mkdir();

}

//签建DSA密签签生签成签器签

KeyPairGenerator keygen=

keygen.initialize(1024);

//得到密签签

KeyPair keys=keygen.generateKeyPair();

PublicKey pubkey=keys.getPublic();

PrivateKey prikey=keys.getPrivate();

Obj ectOutputStream out=new ObjectOutputStream(new FileOutputStream(fileName+"/公签.dat"));out.writeObj ect(pubkey);out.close();

out=new Obj ectOutputStream(new

FileOutputStream(fileName

+"/私签.dat"));out.writeObj ect(prikey);out.close();

}catch(Exception e1) {e1.printStackTrace();

}

}public void sign() {try{

String fileName=null;

JFileChooser jfc=new JFileChooser();jfc.setDialogTitle("签入私签文签件签 ");if(jfc.showOpenDialog(this)==

JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();

}if(fileName==null)return;

//签取私签

ObjectInputStream ois=new ObjectInputStream(newFileInputStream(fileName));

PrivateKey prikey=(PrivateKey)ois.readObject();

//签建SHAlwithD SA签名签java.security.Signature dsa=j ava.security.Signature.getInstance(

"SHA1withDSA", "SUN");

//签置生成摘要的私签dsa.initSign(prikey);

//签文本区的文本签行签签名签签签dsa.update(jta.getText().getBytes("UTF-8"));

//得到签名签后签的签签名签摘签要签签byte[] signText=dsa.sign();

if(jfc.showSaveDialog(this)==

JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();

}

if(fileName==null)return;

FileOutputStream fos=new FileOutputStream(fileName);fos.write(signText);fos.close();

}catch(Exception e1) {e1.printStackTrace();

}

}public void validateSign() {try{

String fileName=null;

JFileChooser jfc=new JFileChooser();jfc.setDialogTitle("签入公签文签件签 ");if(jfc.showOpenDialog(this)==

JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();}if(fileName==null)return;

Obj ectInputStream in=new ObjectInputStream(newFileInputStream(fileName));

PublicKey pubkey=(PublicKey) in.readObject();jfc=new JFileChooser();jfc.setDialogTitle("打签签名签文签件签 ");if(jfc.showOpenDialog(this)==

JFileChooser.APPROVE_OPTION) {fileName=jfc.getSelectedFile().getPath();}if(fileName==null)return;

//从签名签文签件签签中签取签签名签摘签要签

FileInputStream fis=new FileInputStream(fileName);byte[] sigToVerfiy=new byte[fis.available()];fis.read(sigToVerfiy);fis.close();

//签建SHA1withD SA签名签java.security.Signature sig=j ava.security.Signature.getInstance(

"SHA1withDSA", "SUN");

//签置签签的签公签签sig.initVerify(pubkey);

//签签文本区sig.update(jta.getText().getBytes("UTF-8"));

JOptionPane.showMessageDialog(null, "签名不正确");}

}catch(Exception e1) {e1.printStackTrace();

}

}

}