Java 中的 KeyStore deleteEntry()方法，示例
原文:https://www . geesforgeks . org/keystore-delete entry-method-in-Java-with-examples/
java.security.KeyStore 类的 deleteEntry(字符串别名)方法用于删除所请求别名的条目。
语法:
public final void deleteEntry(String alias)
throws KeyStoreException
参数:该方法将别名的名称作为要删除条目的字符串类型的参数。
返回值:这个方法没有什么可返回的。
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。
以下是说明删除条目()方法的示例:
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 using 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
例 2: 为
// 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 using 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
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