Java calls Windows command line using runtime

When Java needs to invoke the Windows system for interaction, it can be manipulated using runtime.

Example:

1, call the window to get information about Java-related

        Runtime RT = Runtime.getruntime ();         = Rt.exec ("WMIC process where caption=\" javaw.exe\ "Get Caption,commandline/value");         New BufferedReader (new  InputStreamReader (P.getinputstream ()));         NULL ;          while ((Line=br.readline ()) =null) {            System.out.println (new String (line.getbytes (), "GBK"));        }        Br.close ();        System.out.println ("over");

The results appear as follows:

2. Querying windows in Java port: 80

        Runtime RT = Runtime.getruntime ();         // OK New BufferedReader (new  InputStreamReader (P.getinputstream ()));                           NULL ;          while ((Line=br.readline ()) =null) {            System.out.println (new String (line.getbytes (), "GBK"));        }        Br.close ();        System.out.println ("over");

The result is:

3. Execute BAT file

Runtime RT = Runtime.getruntime (); Rt.exec ("cmd/k start D:/run/hello.bat");

Note: The simple bat that is written can be executed as described above, but: not when hello needs to rely on external environment variables

For example, I need to launch Tomcat to publish a web

Rt.exec ("cmd/k start D:/run/tomcat/bin/startup.bat"); // will error

// Use && to Stitch rt.exec ("cmd/k D: && cd d:/run/tomcat/bin && startup.bat") when using exec to execute multiple commands ; // OK

cmd dir is to close the command window after executing the dir command.  cmddir  is a command window that is not closed after the dir command is executed.  cmdstartdir  will open a new window and execute the dir instruction, the original window will be closed.  cmdstartdir will open a new window and execute the dir instruction, the original window will not be closed.

Java calls Windows command line using runtime