用Java写计算字符串的MD5值的计算器。用了两个.java文件，共有四个类，其中一个计算并返回MD5值，一个是界面功能的类，一个是内部类，实现按钮的功能的，另一个是实现用浏览器打开指定网页的，采用了网上的一段代码。把代码贴上，望指点。
这是计算功能的代码。
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5 {
private MessageDigest md5;
private String inString;
MD5(String input) {
inString = input;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
// calculate md5 value, and return as Hex value string
String calculate() {
byte[] md5Value = this.md5.digest(inString.getBytes());
StringBuffer valueHex = new StringBuffer();
int tmp;
for (int i = 0; i < md5Value.length; i++) {
tmp = md5Value[i] & 0xff;
// 当tmp<16时，转换为16进制值将缺少一个0
if (tmp < 16) {
valueHex.append(0);
}
valueHex.append(Integer.toHexString(tmp));
}
return valueHex.toString();
}
public static void main(String[] args) {
}
}
这是界面功能的代码。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class MainPanel extends JFrame{
private String inString;
private String compareString;
private String outputString;
static JTextField inputText = new JTextField();
static JTextField outputText = new JTextField();
static JTextField compareText = new JTextField();
static JButton compute = new JButton("计算");
static JButton compare = new JButton("比较");
static JButton empty = new JButton("清空");
static JButton freeback = new JButton("意见反馈");
// create main user interface
MainPanel() {
super("MD5计算器 V0.1.0");
setIconImage(new ImageIcon("./res/icon.gif").getImage());
setSize(320, 160);
setResizable(false);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel jp = new JPanel();
jp.setLayout(new BorderLayout());
JPanel labels = new JPanel();
labels.setLayout(new GridLayout(3, 1));
labels.add(new JLabel(" 原信息 "));
labels.add(new JLabel(" MD5值 "));
labels.add(new JLabel(" 参考值 "));
JPanel texts = new JPanel();
GridLayout textLayout = new GridLayout(3, 1);
textLayout.setVgap(5);
texts.setLayout(textLayout);
outputText.setEditable(false);
texts.add(inputText);
texts.add(outputText);
texts.add(compareText);
JPanel buttons = new JPanel();
FlowLayout buttonsLay = new FlowLayout();
buttonsLay.setHgap(10);
buttons.setLayout(buttonsLay);
NewAction newAction = new NewAction();
compute.addActionListener(newAction);
compare.addActionListener(newAction);
empty.addActionListener(newAction);
freeback.addActionListener(newAction);
buttons.add(compute);
buttons.add(compare);
buttons.add(empty);
buttons.add(freeback);
jp.add(labels, BorderLayout.WEST);
jp.add(texts, BorderLayout.CENTER);
jp.add(buttons, BorderLayout.SOUTH);
setContentPane(jp);
}
public static void main(String[] args) {
MainPanel panel = new MainPanel();
panel.setVisible(true);
}
class NewAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
JButton button = (JButton) e.getSource();
if (button == compute) {
MD5 md5 = new MD5(inputText.getText());
outputString = md5.calculate();
outputText.setText(outputString);
} else if (button == compare) {
if (outputText.getText().equals("")) {
JOptionPane.showMessageDialog(null, "请先计算");
} else {
if (outputText.getText().equals(compareText.getText())) {
JOptionPane.showMessageDialog(null, "MD5值相同");
} else {
JOptionPane.showMessageDialog(null, "MD5值不同");
}
}
} else if (button == empty) {
inputText.setText(null);
outputText.setText(null);
compareText.setText(null);
inString = null;
outputString = null;
compareString = null;
} else {
try {
BareBonesBrowserLaunch.browse("http://blog.sina.com.cn/s/blog_03f9d3"
"6e0100qihm.html");
} catch (IllegalArgumentException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InvocationTargetException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (NoSuchMethodException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
}
// 这段代码取自网上，现一时未能找到，望原作见谅。
class BareBonesBrowserLaunch {
public static void openURL(String url) {
try {
browse(url);
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"Error attempting to launch web browser:/n" +
e.getLocalizedMessage());
}
}
static void browse(String url) throws ClassNotFoundException,
IllegalAccessException, IllegalArgumentException,
InterruptedException, InvocationTargetException, IOException,
NoSuchMethodException {
String osName = System.getProperty("os.name", "");
if (osName.startsWith("Mac OS")) {
Class fileMgr = Class.forName("com.apple.eio.FileManager");
Method openURL = fileMgr.getDeclaredMethod("openURL",
new Class[] { String.class });
openURL.invoke(null, new Object[] { url });
} else if (osName.startsWith("Windows")) {
Runtime.getRuntime().exec(
"rundll32 url.dll,FileProtocolHandler " + url);
} else { // assume Unix or Linux
String[] browsers = { "firefox", "opera", "konqueror", "epiphany",
"mozilla", "netscape" };
String browser = null;
for (int count = 0; count < browsers.length && browser == null; count++)
if (Runtime.getRuntime()
.exec(new String[] { "which", browsers[count] })
.waitFor() == 0)
browser = browsers[count];
if (browser == null)
throw new NoSuchMethodException("Could not find web browser");
else
Runtime.getRuntime().exec(new String[] { browser, url });
}
}
}