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利用Authenticator技术访问外部http server。
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
public class URLPassword extends Frame {
private TextField tf = new TextField();
private TextArea ta = new TextArea();
public URLPassword() {
super ("URL Password");
// 安装 Authenticator
Authenticator.setDefault (new MyAuthenticator ());
// 设置屏幕
add (tf, BorderLayout.NORTH);
ta.setEditable(false);
add (ta, BorderLayout.CENTER);
tf.addActionListener (new ActionListener() {
public void actionPerformed (ActionEvent e) {
String s = tf.getText();
if (s.length() != 0)
ta.setText (fetchURL (s));
}
});
addWindowListener (new WindowAdapter() {
public void windowClosing (WindowEvent e) {
dispose();
System.exit(0);
}
});
}
private String fetchURL (String urlString) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
try {
URL url = new URL (urlString);
InputStream content = (InputStream)url.getContent();
BufferedReader in =
new BufferedReader (new InputStreamReader (content));
String line;
while ((line = in.readLine()) != null) {
pw.println (line);
}
} catch (MalformedURLException e) {
pw.println ("Invalid URL");
} catch (IOException e) {
pw.println ("Error reading URL");
}
return sw.toString();
}
public static void main (String args[]) {
Frame f = new URLPassword();
f.setSize(300, 300);
f.setVisible (true);
}
class MyAuthenticator extends Authenticator {
protected PasswordAuthentication getPasswordAuthentication() {
final Dialog jd = new Dialog (URLPassword.this, "Enter password", true);
jd.setLayout (new GridLayout (0, 1));
Label jl = new Label (getRequestingPrompt());
jd.add (jl);
TextField username = new TextField();
username.setBackground (Color.lightGray);
jd.add (username);
TextField password = new TextField();
password.setEchoChar ('*');
password.setBackground (Color.lightGray);
jd.add (password);
Button jb = new Button ("OK");
jd.add (jb);
jb.addActionListener (new ActionListener() {
public void actionPerformed (ActionEvent e) {
jd.dispose();
}
});
jd.pack();
jd.setVisible(true);
String pass= new String(password.getText());
return new PasswordAuthentication (username.getText(),pass.toCharArray());
}
}
}
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利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server利用Authenticator技术访问proxy外部http server
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