PropertyPermission


PropertyPermission java.util

Java 1.2 serializable permission

This class is a java.security.Permission that governs read and write access to system properties with System.getProperty( ) and System.setProperty( ) . A PropertyPermission object has a name, or target, and a comma-separated list of actions. The name of the permission is the name of the property of interest. The action string can be "read" for getProperty( ) access, "write" for setProperty( ) access, or "read,write" for both types of access. PropertyPermission extends java.security.BasicPermission , so the name of the property supports simple wildcards. The name "*" represents any property name. If a name ends with ".*", it represents any property names that share the specified prefix. For example, the name "java.*" represents "java.version", "java.vendor", "java.vendor.url", and all other properties that begin with "java".

Granting access to system properties is not overtly dangerous, but caution is still necessary. Some properties, such as " user .home", reveal details about the host system that malicious code can use to mount an attack. Programmers writing system-level code and system administrators configuring security policies may need to use this class, but applications never need to use it.

Figure 16-49. java.util.PropertyPermission

 public final class  PropertyPermission  extends java.security.BasicPermission {  // Public Constructors  public  PropertyPermission  (String  name  , String  actions  );  // Public Methods Overriding BasicPermission  public boolean  equals  (Object  obj  );        public String  getActions  ( );        public int  hashCode  ( );        public boolean  implies  (java.security.Permission  p  );        public java.security.PermissionCollection  newPermissionCollection  ( );   } 



Java In A Nutshell
Java In A Nutshell, 5th Edition
ISBN: 0596007736
EAN: 2147483647
Year: 2004
Pages: 1220

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net