java.security.Provider.Service类的getProvider()方法用于返回此提供程序服务对象的提供程序。

用法:

public final Provider getProvider()

返回值：此方法返回此提供程序服务对象的提供程序。

下面是说明getProvider()方法的示例：

范例1：

// Java program to demonstrate

// getProvider() 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 Provider of Provider.Service object

// by using getProvider() method

Provider name = service.getProvider();

// display the result

System.out.println("Provider:" + name);

}

catch (NoSuchAlgorithmException e) {

System.out.println("Exception thrown:" + e);

}

catch (NoSuchProviderException e) {

System.out.println("Exception thrown:" + e);

}

}

}

输出：

Provider:SUN version 1.8

范例2：

// Java program to demonstrate

// getProvider() 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 Provider of Provider.Service object

// by using getProvider() method

Provider name = service.getProvider();

// display the result

System.out.println("Provider:" + name);

}

catch (NoSuchAlgorithmException e) {

System.out.println("Exception thrown:"

+ e);

}

}

}

输出：

Provider:SUN version 1.8