隐性:启动时添加-Djava.security.manager 显性:System.setSecurityManager publicclassNoShowTest{staticclassCustomManagerextendsSecurityManager{@OverridepublicvoidcheckRead(Stringfile) {thrownewAccessControlException("无权限访问"); } }publicstaticvoidmain(String[] args) {System.setSecurityManager(newCustomManager()...
try{// 可能会抛出AccessControlException的代码,比如读取文件FileReaderfileReader=newFileReader("/data/config.properties"); }catch(AccessControlException ace) { System.err.println("没有访问权限:"+ ace.getMessage());// 可以在这里进行其他处理,如记录日志Logger.getLogger("MyLogger").log(Level.SEVERE,"...
Policy的主要任务就是判断被访问的资源是否允许被调用代码访问(根据调用代码的URL,签名和默认权限做判断) Access Control Enforcement(访问控制) Java runtime会跟踪调用栈(调用方法的先后顺序之类的),当访问一个被保护的资源时,整个调用栈都要被评估是否有权限访问。如果任何一个没有权限,都会抛出java.lang.SecurityExce...
This exception is thrown by the AccessController to indicate that a requested access (to a critical system resource such as the file system or the network) is denied. C# 複製 [Android.Runtime.Register("java/security/AccessControlException", DoNotGenerateAcw=true)] public class AccessControlExcep...
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package demo.security; import java.io.File; import java.io.IOException; import java.security.AccessControlException; import learn.java.security.FileUtil; public class DemoDoPrivilege { public static void main(String[] args) { System.out.println("***"); System.out.println("I will show Access...
for (int i = m; i > 0; i--) { if (caller i's domain does not have the permission) throw AccessControlException else if (caller i is marked as privileged) { if (a context was specified in the call to doPrivileged) context.checkPermission(permission) if (limited permissions were spe...
java.security.AccessControlContext public final classAccessControlContextextendsObject An AccessControlContext is used to make system resource access decisions based on the context it encapsulates. More specifically, it encapsulates a context and has a single method,checkPermission, that is equivalent to thech...
A caller can be marked as being "privileged" (see doPrivileged and below). When making access control decisions, the checkPermission method stops checking if it reaches a caller that was marked as "privileged" via a doPrivileged call without a context argument (see below for information about...
如果是安装了 SecurityManager,则应调用 SecurityManager 的checkSystemClipboardAccess 方法,以确保可以访问系统剪贴板。如果使用 checkSystemClipboardAccess 的默认实现(即如果未重写该方法),则将导致使用 AWTPermission("accessClipboard") 权限调用 SecurityManager 的checkPermission 方法。 返回: 以Clipboard 形式返回系统...