提供者。Java 中的 Service getType()方法,示例
原文:https://www . geesforgeks . org/provider-service-gettype-method-in-Java-with-examples/
Java . security . provider . service类的 getType() 方法提供了提供者服务的类型。
语法:
public final String getType()
返回值:该方法提供特定类型的提供者服务。
以下是说明 getType() 方法的示例:
例 1:
// Java program to demonstrate
// getType() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating the object of Signature
Signature sr
= Signature.getInstance(
"SHA1withDSA",
"SUN");
// getting the Provider of the Signature sr
// by using method getProvider()
Provider provider = sr.getProvider();
// getting the service of the provider
// using getServices() method
Provider.Service service
= provider
.getService("Signature",
sr.getAlgorithm());
// getting type of Provider.Service object
// by using getClassName() method
String name = service.getType();
// display the result
System.out.println("Name of the type : "
+ name);
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
catch (NoSuchProviderException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Name of the type : Signature
例 2:
// Java program to demonstrate
// getType() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating object of MessageDigest
MessageDigest msd
= MessageDigest.getInstance("MD5");
// getting the Provider of the Signature sr
// by using method getProvider()
Provider provider = msd.getProvider();
// getting the service of the provider
// using getServices() method
Provider.Service service
= provider
.getService("MessageDigest",
msd.getAlgorithm());
// getting type of Provider.Service object
// by using getClassName() method
String name = service.getType();
// display the result
System.out.println("Name of the type : "
+ name);
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Name of the type : MessageDigest
参考:https://docs . Oracle . com/javase/9/docs/API/Java/security/Provider。service . html # GetType–
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