Java 中 KeyStore getDefaultType()方法,带示例
原文:https://www . geesforgeks . org/keystore-getdefaulttype-method-in-Java-with-examples/
java.security.KeyStore 类的 getDefaultType() 方法用于提供 KeyStore 类的默认实例。
语法:
public static final String getDefaultType()
参数:该方法不取任何内容作为参数。 返回值:该方法返回密钥库类的默认实例。
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 getDefaultType() 方法的例子:
例 1:
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate getDefaultType() 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 the type of default keystore
// using getDefaultType() method
String type
= sr.getDefaultType();
// display the result
System.out.println(
"type of default"
+ " keystore entry : "
+ type);
}
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:
示例 2: 不加载密钥库
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate getDefaultType() 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 the type of default keystore
// using getDefaultType() method
String type
= sr.getDefaultType();
// display the result
System.out.println(
"type of default keystore entry : "
+ type);
}
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);
}
}
}
输出:
参考:T2【https://docs . Oracle . com/javase/9/docs/API/Java/security/keystore . html # getDefaultType–T4】
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