e220. managing policy files.txt

这里面包含了一百多个JAVA源文件

By default, the JDK uses the policy files located in 
    file:${java.home}/lib/security/java.policy
    file:${user.home}/.java.policy

These policy files are specified in the default security file: 
    ${java.home}/lib/security/java.security

The final policy is the union of all granted permissions in all policy files. To specify an additional policy file, you can set the java.security.policy system property at the command line: 
    > java -Djava.security.manager -Djava.security.policy=someURL MyApp
    or
    > appletviewer -J-Djava.security.policy=someURL HTMLfile


To ignore the policies in the java.security file, and only use the specified policy, use `==' instead of `=': 
    > java -Djava.security.manager -Djava.security.policy==someURL MyApp


Additional policy files can also be added to the java.security file. For more information on policy files, see 
    http://java.sun.com/j2se/1.4/docs/guide/security/PolicyFiles.html