java.security.KeyStore类的isKeyEntry()方法用于检查是否存在特定的指定键条目。它返回一个表示是否相同的布尔值。
用法:
public final boolean isKeyEntry(String alias) throws KeyStoreException
参数:此方法接受别名的名称作为要检查其 key 条目的参数。
返回值:此方法返回一个布尔值,说明所请求的键条目的存在。
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isCertificateEntry()方法的示例:
示例1:
// Java program to demonstrate isKeyEntry() 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 usng 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 key entry
// using isCertificateEntry() method
Boolean status
= sr.isKeyEntry("ftpkey");
// display the result
if (status)
System.out.println("\nkey entry is present");
else
System.out.println("\nkey 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);
}
}
}
示例2:对于KeyStoreException
// Java program to demonstrate isKeyEntry() 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 usng 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 key entry
// using isCertificateEntry() method
Boolean status
= sr.isKeyEntry("ftpkey");
// display the result
if (status)
System.out.println("key entry is present");
else
System.out.println("key 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);
}
}
}
参考:https://docs.oracle.com/javase/9/docs/api/java/security/KeyStore.html#isKeyEntry-java.lang.String-
相关用法
- Java KeyStore getCertificate()用法及代码示例
- Java KeyStore containsAlias()用法及代码示例
- Java KeyStore getEntry()用法及代码示例
- Java KeyStore deleteEntry()用法及代码示例
- Java KeyStore getType()用法及代码示例
- Java KeyStore getKey()用法及代码示例
- Java KeyStore getDefaultType()用法及代码示例
- Java KeyStore getCertificateAlias()用法及代码示例
- Java KeyStore getProvider()用法及代码示例
- Java KeyStore getCreationDate()用法及代码示例
- Java KeyStore aliases()用法及代码示例
- Java KeyStore getCertificateChain()用法及代码示例
- Java KeyStore isCertificateEntry()用法及代码示例
- Java Java lang.Long.builtcount()用法及代码示例
注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 KeyStore isKeyEntry() 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。