Java操作证书

import java.io.FileInputStream;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.util.Enumeration;

public static void GetPrivateKey()
{
    try{
        
         KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
         
         keystore.load(new FileInputStream("C:\\Program Files\\Java\\jre7\\bin\\xiaoyaodijun.keystore"), "7391428".toCharArray());

         KeyPair keyPair = getPrivateKey2(keystore, "xiaoyaodijun.keystore", "7391428".toCharArray());

         PrivateKey privateKey = keyPair.getPrivate();
          System.out.println("private key = " + privateKey);
          
      
          
          
    }catch(Exception ex){}
}
    

public static KeyPair getPrivateKey2(KeyStore keystore, String alias, char[] password) {    
    try {    
            Key key=keystore.getKey(alias,password);    
            if(key instanceof PrivateKey) {    
                    Certificate cert=keystore.getCertificate(alias);    
                    PublicKey publicKey=cert.getPublicKey();    
                    return new KeyPair(publicKey,(PrivateKey)key);    
            }    
    }catch (Exception e) {    
}    
return null;    
}