搜到的代码
运行时只到Usage: java PrivateExample text
请问该怎么解决啊？
import java.security.*;
import javax.crypto.*;
//
// encrypt and decrypt using the DES private key algorithm
public class PrivateExample {
/**
* @param args
*/
public static void main(String[] args) throws Exception {
//
// check args and get plaintext
if (args.length !=1) {
System.err.println("Usage: java PrivateExample text");
System.exit(1);
}
byte[] plainText = args[0].getBytes("UTF8");
//
// get a DES private key
System.out.println( "\nStart generating DES key" );
KeyGenerator keyGen = KeyGenerator.getInstance("DES");
keyGen.init(56);
Key key = keyGen.generateKey();
System.out.println( "Finish generating DES key" );
//
// get a DES cipher object and print the provider
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
System.out.println( "\n" + cipher.getProvider().getInfo() );
//
// encrypt using the key and the plaintext
System.out.println( "\nStart encryption" );
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(plainText);
System.out.println( "Finish encryption: " );
System.out.println( new String(cipherText, "UTF8") );
//
// decrypt the ciphertext using the same key
System.out.println( "\nStart decryption" );
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] newPlainText = cipher.doFinal(cipherText);
System.out.println( "Finish decryption: " );
System.out.println( new String(newPlainText, "UTF8") );
}
}
------解决方案--------------------
参数个数不对，直接退出了