本文整理匯總了Java中java.lang.System.getSecurityManager方法的典型用法代碼示例。如果您正苦於以下問題：Java System.getSecurityManager方法的具體用法？Java System.getSecurityManager怎麽用？Java System.getSecurityManager使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類java.lang.System的用法示例。
在下文中一共展示了System.getSecurityManager方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: doit
import java.lang.System; //導入方法依賴的package包/類
private void doit() throws Exception {
// A security manager must be installed
SecurityManager sm=System.getSecurityManager();
if (sm==null)
throw new
Exception("Test must be run with a security manager installed");
// Instantiate and set the new policy
DynamicPolicy dp = new DynamicPolicy();
Policy.setPolicy(dp);
// Verify that policy has been set
if (dp != Policy.getPolicy())
throw new Exception("Policy was not set!!");
// now see this class can access user.name
String usr = getUserName();
if (usr != null) {
System.out.println("Test was able to read user.name prior to refresh!");
throw new
Exception("Test was able to read user.name prior to refresh!");
}
// Now, make policy allow reading user.name
dp.refresh();
// now I should be able to read it
usr = getUserName();
if (usr == null) {
System.out.println("Test was unable to read user.name after refresh!");
throw new
Exception("Test was unable to read user.name after refresh!");
}
// Now, take away permission to read user.name
dp.refresh();
// now I should not be able to read it
usr = getUserName();
if (usr != null) {
System.out.println("Test was able to read user.name following 2nd refresh!");
throw new
Exception("Test was able to read user.name following 2nd refresh!");
}
}