Java 中的 KeyStore 别名()方法,带示例

原文:https://www . geesforgeks . org/keystore-alias-method-in-Java-with-examples/

java.security.KeyStore 类的别名()方法提供了与此 KeyStore 对象相关联的别名。

语法:

public final Enumeration aliases()
  throws KeyStoreException

返回值:该方法将与该密钥库对象相关联的所有别名的列表作为枚举对象返回。 异常:如果不初始化这个密钥库,这个方法抛出密钥库异常注意:本文中的所有程序都不会在联机 IDE 上运行,因为不存在“privatekey”密钥库。您可以在系统的 Java 编译器上检查这些代码。要检查此代码,请在您的系统上创建一个密钥库“privatekey”,并设置您自己的密钥库密码来访问该密钥库。 以下是举例说明别名()方法: 例 1:

Java 语言(一种计算机语言,尤用于创建网站)

// Java program to demonstrate
// getInstance() method

import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.io.*;

public class GFG {
    public static void main(String[] argv)
    {

        try {

            // creating the object of MessageDigest
            // and getting instance
            // By using getInstance() method
            KeyStore sr = KeyStore.getInstance("JKS");

            // keystore password is require to access keystore
            char[] pass = ("123456").toCharArray();

            // creating and initializing object of InputStream
            InputStream is
                = new FileInputStream(
                    "f:/java/private key.store");

            // initializing keystore object
            sr.load(is, pass);

            // getting the list of aliases
            // using aliases() method
            Enumeration<String> e = sr.aliases();

            // display the result
            System.out.println("List of all the alias present");
            while (e.hasMoreElements()) {
                System.out.print(e.nextElement() + "");
                System.out.println();
            }
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (NullPointerException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (KeyStoreException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (FileNotFoundException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (IOException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (CertificateException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output: 

List of all the alias present
ftpkey