本文整理汇总了Java中java.lang.System.getSecurityManager方法的典型用法代码示例。如果您正苦于以下问题：Java System.getSecurityManager方法的具体用法？Java System.getSecurityManager怎么用？Java System.getSecurityManager使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类java.lang.System的用法示例。
在下文中一共展示了System.getSecurityManager方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: doit
import java.lang.System; //导入方法依赖的package包/类
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!");
}
}