www.pudn.com > MyCallback.rar > MyCallbackHandler.java

import java.io.*; 
import javax.security.auth.callback.*; 
public class MyCallbackHandler implements CallbackHandler{ 
public void handle(Callback[] callbacks) 
     throws IOException, UnsupportedCallbackException { 
     for (int i = 0; i < callbacks.length; i++) { 
if (callbacks[i] instanceof NameCallback) { 
    //强制转换 
NameCallback nameCallback = (NameCallback)callbacks[i]; 
 // 显示提示信息 
System.out.print( nameCallback.getPrompt()  
+ "["+ nameCallback.getDefaultName()+"]:"); 
System.out.flush(); 
//读取用户输入 
String username = new BufferedReader( 
new InputStreamReader(System.in)).readLine(); 
if(username==null || username.length( )==0){ 
username= nameCallback.getDefaultName(); 
} 
//保存用户输入 
nameCallback.setName(username); 
 } else if (callbacks[i] instanceof PasswordCallback) { 
  			PasswordCallback passwordCallback =  
(PasswordCallback) callbacks[i]; 
System.out.print( passwordCallback.getPrompt() + "? "); 
System.out.flush(); 
String password = new BufferedReader( 
new InputStreamReader(System.in)).readLine(); 
passwordCallback.setPassword(password.toCharArray()); 
password = null;   
      } else  if (callbacks[i] instanceof TextOutputCallback) { 
TextOutputCallback  textOutputCallback= 
(TextOutputCallback)callbacks[i]; 
System.out.println(textOutputCallback.getMessage( )); 
   	 } else  if (callbacks[i] instanceof ConfirmationCallback) { 
       } 
else { 
     		     throw new UnsupportedCallbackException( 
		callbacks[i], "Unrecognized Callback"); 
   	 } 
  } // end for 
}  // end handle( ) 
} // end class