作者：睿芬惠洁育瑋 | 来源：互联网 | 2023-10-10 15:18
Java 中的 KeyStore isCertificateEntry()方法，示例
原文:https://www . geesforgeks . org/keystore-iscertifientry-method-in-Java-with-examples/
java.security.KeyStore 类的 isCertificateEntry() 方法用于检查指定的证书条目是否存在于此 KeyStore 实例中。它返回一个表示相同的布尔值。
语法:
public final boolean isCertificateEntry(String alias)
throws KeyStoreException
参数:该方法接受别名的名称作为要检查其证书条目的参数。
返回值:该方法检查所请求别名的证书条目是否存在，并返回一个布尔值。
异常:如果密钥库还没有初始化，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iscertifientry()方法的示例:
例 1:
// Java program to demonstrate getCertificate() 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);
// checking the presence of certificate entry
// using isCertificateEntry() method
Boolean status
= sr.isCertificateEntry("ftpkey");
// display the result
if (status)
System.out.println(
"\nCertificate "
+ "entry is present");
else
System.out.println(
"\nCertificate "
+ "entry is not present");
}
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:![]()
示例 2: 适用于密钥库异常
// Java program to demonstrate getCertificate() 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);
// checking the presence of certificate entry
// using isCertificateEntry() method
Boolean status
= sr.isCertificateEntry("ftpkey");
// display the result
if (status)
System.out.println(
"\nCertificate "
+ "entry is present");
else
System.out.println(
"\nCertificate "
+ "entry is not present");
}
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);
}
}
}
输出:
![]()
参考:https://docs . Oracle . com/javase/9/docs/API/Java/security/keystore . html # iscertifieteentry-Java . lang . string-
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