java获取系统环境变量和系统属性

 

代码

   
     

    
      
    
      package
    
       jdk.system;


    
      import
    
       java.util.Map;

    
      import
    
       java.util.Properties;

    
      import
    
       java.util.Set;


    
      /**
    
      
 * 
    
      @author
    
       <a href="mailto:[email protected]">张挺</a>
 * 
    
      @since
    
       2010-3-26 10:11:16
 
    
      */
    
      

    
      public
    
       
    
      class
    
       SystemEnvDemo {
 
    
      public
    
       
    
      static
    
       
    
      void
    
       main(String[] args) {
 System.out.println(
    
      "
    
      current system environment variable:
    
      "
    
      );
 Map
    
      <
    
      String,String
    
      >
    
       map 
    
      =
    
       System.getenv();
 Set
    
      <
    
      Map.Entry
    
      <
    
      String,String
    
      >>
    
       entries 
    
      =
    
       map.entrySet();
 
    
      for
    
       (Map.Entry
    
      <
    
      String, String
    
      >
    
       entry : entries) {
 System.out.println(entry.getKey() 
    
      +
    
       
    
      "
    
      :
    
      "
    
       
    
      +
    
       entry.getValue());
 }

 System.out.println(
    
      "
    
      ---------------
    
      "
    
      );
 System.out.println(
    
      "
    
      current system properties:
    
      "
    
      );
 Properties properties 
    
      =
    
       System.getProperties();
 Set
    
      <
    
      Map.Entry
    
      <
    
      Object, Object
    
      >>
    
       set 
    
      =
    
       properties.entrySet();
 
    
      for
    
       (Map.Entry
    
      <
    
      Object, Object
    
      >
    
       objectObjectEntry : set) {
 System.out.println(objectObjectEntry.getKey() 
    
      +
    
       
    
      "
    
      :
    
      "
    
       
    
      +
    
       objectObjectEntry.getValue());
 }

 }
}