Java 中 KeyStore getCreationDate()方法,示例
原文:https://www . geesforgeks . org/keystore-getcreationdate-method-in-Java-with-examples/
java.security.KeyStore 类的 getCreationDate() 方法用于在指定别名的帮助下获取指定条目的创建日期。
语法:
public final Date getCreationDate(String alias)
throws KeyStoreException
参数:此方法接受别名的名称作为要获取其创建日期的参数。
返回值:该方法返回所请求别名的创建日期(如果存在)。
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。
以下是说明 getCertificateChain() 方法的示例:
例 1:
// Java program to demonstrate getCreationDate() 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 date of Creation
// using getCreationDate() method
Date date
= sr.getCreationDate("ftpkey");
// display the result
System.out.println("Creation date : "
+ date.toString());
}
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);
}
}
}
示例 2: 适用于密钥库异常
// Java program to demonstrate getCreationDate() 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 date of Creation
// using getCreationDate() method
Date date
= sr.getCreationDate("ftpkey");
// display the result
System.out.println("Creation date : "
+ date.toString());
}
catch (FileNotFoundException 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);
}
}
}
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