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】