Define your own security manager : SecurityManager « Security « Java Tutorial

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Java Tutorial » Security » SecurityManager 
36. 41. 4. Define your own security manager
class CustomSecurityManager extends SecurityManager {
  public CustomSecurityManager() {
    super();
  }

  public void checkRead(String fileName) {
    if (fileName != null && fileName.endsWith(".java")) {
      throw new SecurityException(" You are not allowed to read " " file names ending with .java");
    }
    super.checkRead(fileName);
  }

  public void checkWrite(String fileName) {
    if (fileName != null && fileName.endsWith(".java")) {
      throw new SecurityException(" You are not allowed to write "
          " file names ending with .java");
    }
    super.checkWrite(fileName);
  }

  public void checkDelete(String fileName) {
    if (fileName != null && fileName.endsWith(".java")) {
      throw new SecurityException(" You are not allowed to delete "
          " file names ending with .java");
    }
    super.checkDelete(fileName);
  }
}

public class MainClass {
  public static void main() {
    System.setSecurityManager(new CustomSecurityManager());
    SecurityManager secMgr = System.getSecurityManager();
    if (secMgr != null) {
      secMgr.checkRead("fileName");
    }
  }
}
36. 41. SecurityManager
36. 41. 1. extends SecurityManager
36. 41. 2. Use SecurityManager to check AWT permission and file permission
36. 41. 3. Listing All Permissions Granted to Classes Loaded from a URL or Directory
36. 41. 4. Define your own security manager
36. 41. 5. Enabling the Security Manager
36. 41. 6. To specify an additional policy file, set the java.security.policy system property at the command line:
36. 41. 7. To ignore the policies in the java.security file, and use the specified policy, use '==' instead of '='
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