Java KeyStore deleteEntry()用法及代码示例

java.security.KeyStore类的deleteEntry(String alias)方法用于删除请求的别名name的条目。

用法:

public final void deleteEntry(String alias)
  throws KeyStoreException

参数：此方法将别名的名称作为要删除其条目的String类型的参数来查找。

返回值：此方法无返回值。

异常：如果您不初始化此 key 库，则此方法将引发KeyStoreException。

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deleteEntry()方法的示例：

示例1:

// 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 Enumeration<String> object 
            // and initializing with null 
            Enumeration<String> e = null; 
  
            // creating the object of MessageDigest 
            // and getting instance 
            // By usng 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 
            e = sr.aliases(); 
  
            // display the result 
            System.out.println("List of all the alias"
                               + " present before deletion"); 
            while (e.hasMoreElements()) { 
                System.out.print(e.nextElement() + " "); 
                System.out.println(); 
            } 
  
            // delete the entry having alias name htttp 
            // using deleteEntry method 
            sr.deleteEntry("htttp"); 
  
            // getting the list of aliases 
            // using aliases() method 
            e = sr.aliases(); 
  
            // display the result 
            System.out.println("\nList of all the alias"
                               + " present after deletion"); 
            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); 
        } 
    } 
}

输出：

List of all the alias present before deletion
ftpkey
htttp

List of all the alias present after deletion
ftpkey

示例2:对于

// 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 Enumeration<String> object 
            // and initializing with null 
            Enumeration<String> e = null; 
  
            // creating the object of MessageDigest 
            // and getting instance 
            // By usng getInstance() method 
            KeyStore sr = KeyStore.getInstance("JKS"); 
  
            // initializing keystore object 
            // sr.load(is, pass); 
  
            // getting the list of aliases 
            // using aliases() method 
            e = sr.aliases(); 
  
            // display the result 
            System.out.println("List of all the alias "
                               + "present before deletion"); 
            while (e.hasMoreElements()) { 
                System.out.print(e.nextElement() + " "); 
                System.out.println(); 
            } 
  
            // delete the entry having alias name htttp 
            // using deleteEntry method 
            sr.deleteEntry("htttp"); 
  
            // getting the list of aliases 
            // using aliases() method 
            e = sr.aliases(); 
  
            // display the result 
            System.out.println("\nList of all the alias"
                               + " present after deletion"); 
            while (e.hasMoreElements()) { 
                System.out.print(e.nextElement() + " "); 
                System.out.println(); 
            } 
        } 
        catch (NullPointerException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
        catch (KeyStoreException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

Exception thrown :
 java.security.KeyStoreException:
 Uninitialized keystore

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

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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 deleteEntry() 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。