用Java实现的字符串简单加密

//用Java实现的字符串简单加密：
//用一个字符串 Key 加密原串
//请高手提提意见哦
//JDK 5.0编译通过
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.border.*;

class Mima{
char key;
public static void main(String[] args) throws Exception{
new Mima();
}
public Mima(){
MyGui tw = new MyGui("文件加密对话框");
tw.setVisible(true);
}
//加密
public String jiaMi(String s,String key){
String str = "";
int ch;
if(key.length() == 0){
return s;
}
else if(!s.equals(null)){
for(int i = 0,j = 0;i < s.length();i++,j++){
if(j > key.length() - 1){
j = j % key.length();
}
ch = s.codePointAt(i) + key.codePointAt(j);
if(ch > 65535){
ch = ch % 65535;//ch - 33 = (ch - 33) % 95 ;
}
str += (char)ch;
}
}
return str;

}
//解密
public String jieMi(String s,String key){
String str = "";
int ch;
if(key.length() == 0){
return s;
}
else if(!s.equals(key)){
for(int i = 0,j = 0;i < s.length();i++,j++){
if(j > key.length() - 1){
j = j % key.length();
}
ch = (s.codePointAt(i) + 65535 - key.codePointAt(j));
if(ch > 65535){
ch = ch % 65535;//ch - 33 = (ch - 33) % 95 ;
}
str += (char)ch;
}
}
return str;
}
class MyGui extends JFrame
{
JButton b1 = new JButton("Encrypt");
JButton b2 = new JButton("Decrypt");
Panel pan1 = new Panel();
Panel pan2 = new Panel();
Panel pan3 = new Panel();
Panel pan4 = new Panel();
Panel pan5 = new Panel();
//
Label label1 = new Label("Sourse File");
Label label2 = new Label("Obj File");
Label label3 = new Label("Key:");

TextArea tf1 = new TextArea("Text Area 1",4,30,TextArea.SCROLLBARS_VERTICAL_ONLY);
TextArea tf2 = new TextArea("Text Area 2",4,30,TextArea.SCROLLBARS_VERTICAL_ONLY);
TextField tf3 = new TextField("key ");
Toolkit theKit = getToolkit();
public MyGui()
{
init();
}
public MyGui(String title)
{
super(title);
init();
}
private void init()
{
setLayout(new BorderLayout());
pan1.setLayout(new GridLayout(1,2));
//
label1.setBackground(new Color(220,220,220));
label2.setBackground(new Color(220,220,220));
label3.setBackground(new Color(220,220,220));
//
tf3.setEchoChar('*');
//

Dimension wndSize = theKit.getScreenSize();
setBounds(wndSize.width/4,wndSize.height/4,
wndSize.width/2,wndSize.height/4);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
//LookAndFeel
setUndecorated(true);
getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
//加密
b1.setToolTipText("加密");
b1.setMnemonic('E');
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
tf2.setText(jiaMi(tf1.getText(),tf3.getText()));
//tf3.setText("");
}
});
b1.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
tf2.setText(jiaMi(tf1.getText(),tf3.getText()));
//tf3.setText("");
}
});
//解密
b2.setToolTipText("解密");
b2.setMnemonic('D');
b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
tf2.setText(jieMi(tf1.getText(),tf3.getText()));
//tf3.setText("");
}
});
b2.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
tf2.setText(jieMi(tf1.getText(),tf3.getText()));
//tf3.setText("");
}
});
//
pan1.add(pan2);
pan1.add(pan3);
pan2.add(label1);
pan3.add(label2);
pan4.add(tf1);
pan4.add(tf2);
pan5.add(b1);
pan5.add(b2);
pan5.add(label3);
pan5.add(tf3);
//.
add("North",pan1);
add("South",pan5);
add("Center",pan4);
}
}
}