java.security.Provider类的getProperty()方法用于在此属性列表中搜索具有指定键的属性。如果在此属性列表中找不到该键,则将递归检查默认属性列表及其默认值。如果找不到该属性,则该方法返回null。
用法:
public String getProperty(String key)
参数:此方法以属性键为参数。
返回值:此方法返回具有指定键值的此属性列表中的值;如果找不到该属性,则返回null。
下面是说明getProperty()方法的示例:
示例1:
// Java program to demonstrate
// getProperty() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
// Declaring int values
int i = 10;
try {
// creating the object of KeyPairGenerator
KeyPairGenerator sr = KeyPairGenerator.getInstance("DSA", "SUN");
// getting the Provider of the KeyPairGenerator sr
// by using method getProvider()
Provider provider = sr.getProvider();
// Declaring the variable of set<Map> type
Set<Object> set;
// getting unmodifiable Set view of the property entries
set = provider.keySet();
// Creating the object of iterator to iterate set
Iterator iter = set.iterator();
while (i > 0) {
// getting the mapped value in element
// using getProperty() method
String property = provider.getProperty((String)iter.next());
// printing the property of specified key
System.out.println("value is : " + property);
i--;
}
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
value is : SHA1withDSA value is : SHA1withDSA value is : SHA1withDSA value is : Software value is : sun.security.provider.JavaKeyStore$DualFormatJKS value is : SHA value is : sun.security.provider.SHA value is : sun.security.provider.JavaKeyStore$CaseExactJKS value is : Software value is : sun.security.provider.DSA$SHA256withDSA
示例2:
// Java program to demonstrate
// getProperty() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
// Declaring int values
int i = 10;
try {
// creating the object of KeyPairGenerator
KeyPairGenerator sr = KeyPairGenerator.getInstance("DSA", "SUN");
// getting the Provider of the KeyPairGenerator sr
// by using method getProvider()
Provider provider = sr.getProvider();
// getting the mapped value in element
// using getProperty() method
System.out.println("Trying to search for unspecified key");
String property = provider.getProperty("geeks");
// printing the property of specified key
System.out.println("value is : " + property);
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Trying to search for unspecified key value is : null
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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Provider getProperty() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。