Java KeyStore getKey()用法及代码示例

java.security.KeyStore类的getKey()方法用于获取与给定别名关联的 key ，并使用给定密码进行恢复。

用法:

public final Key getKey(String alias, char[] password)
    throws KeyStoreException, 
           NoSuchAlgorithmException, 
           UnrecoverableKeyException

参数：此方法接受以下参数：

alias:这是用来检查 key 的别名
password:这是用于恢复要检查的 key 的密码

返回值：此方法返回所请求别名的 key (如果存在)。

异常：此方法引发以下异常

KeyStoreException：如果未加载 key 库。
NoSuchAlgorithmException：如果缺少算法

注意：由于不存在“ privatekey” key 库，因此本文中的所有程序都无法在在线IDE上运行。您可以在系统上的Java编译器上检查此代码。要检查此代码，请在系统上创建 key 库“ privatekey”，并设置自己的 key 库密码以访问该 key 库。

下面是说明getKey()方法的示例：

示例1:

// Java program to demonstrate getKey() 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 KeyStore 
            // and getting instance 
            // By using getInstance() method 
            KeyStore sr = KeyStore.getInstance("JKS"); 
  
            // keystore password is required 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 Key 
            // using getKey() method 
            Key key = sr.getKey("ftpkey", pass); 
  
            // display the result 
            System.out.println("Key : "
                               + key); 
        } 
  
        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); 
        } 
        catch (UnrecoverableKeyException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

示例2:对于KeyStoreException

// Java program to demonstrate getKey() 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 KeyStore 
            // and getting instance 
            // By using getInstance() method 
            KeyStore sr = KeyStore.getInstance("JKS"); 
  
            // keystore password is required 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 Key 
            // using getKey() method 
            Key key = sr.getKey("ftpkey", pass); 
  
            // display the result 
            System.out.println("Key : "
                               + key); 
        } 
        catch (FileNotFoundException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
        catch (NullPointerException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
        catch (KeyStoreException e) { 
  
            System.out.println("\nException thrown : " + e); 
        } 
        catch (UnrecoverableKeyException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
        catch (NoSuchAlgorithmException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

参考： https://docs.oracle.com/javase/9/docs/api/java/security/KeyStore.html#getKey-java.lang.String-char:A-

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 KeyStore getKey() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。