trunk/tools/SystemCmd.java

package tools;

import java.io.*;

/**
 * Package:             tools
 * Class:               PyMol
 * Author:              Real Gagnon (http://www.rgagnon.com/javadetails/java-0014.html)
 *                              Copyright by Ioannis Filippis, filippis@molgen.mpg.de
 * Date:                03/03/2006
 * 
 * SystemCmd's static exec method will spawn an external process to execute an external 
 * program or to launch a unix script or just execute a simple linux command. 
 * The output is captured and returned as string.
 *  
 * Notes:
 * - There are two versions of the exec method, one taking a String array and one just a String
 * - If you want to launch a Unix script and especially use the < > | piping options,
 *       you must invoke the command processor
 *              String[] cmd = {"/bin/sh", "-c", "ls > hello"};
 *              SystemCmd.exec(cmd);
 * - If you need to pass arguments, it's safer to a String array especially if they contain spaces.
 *              String[] cmd = { "myProgram.exe", "-o=This is an option" };
 *              SystemCmd.exec(cmd);
 * 
 * Changelog:
 * 14/03/06 Added exec method to take only a string as argument by JD
 * 03/03/06 first created/copied by IF
 */

public class SystemCmd {
        
        public static String exec(String[] cmd) {               
                String output = "";
                try {
                        String line = "";
                        Process p = Runtime.getRuntime().exec(cmd);
                        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
                        while ((line = input.readLine()) != null) {
                                output = output + line + "\n";
                        }
                        input.close();
                        
                } catch (Exception err) {
                        err.printStackTrace();
                }               
                return output;          
        }
        
        public static String exec(String cmd) {
                String output = "";
                try {
                        String line = "";
                        Process p = Runtime.getRuntime().exec(cmd);
                        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
                        while ((line = input.readLine()) != null) {
                                output = output + line + "\n";
                        }
                        input.close();
                        
                } catch (Exception err) {
                        err.printStackTrace();
                }               
                return output;          
        }
        
        
}
Revision:	39
Committed:	Tue Mar 21 17:21:54 2006 UTC (18 years, 6 months ago) by filippis
File size:	1976 byte(s)
Log Message:	Adding comments
Line	File contents
1	package tools;
2
3	import java.io.*;
4
5	/**
6	* Package: tools
7	* Class: PyMol
8	* Author: Real Gagnon (http://www.rgagnon.com/javadetails/java-0014.html)
9	* Copyright by Ioannis Filippis, filippis@molgen.mpg.de
10	* Date: 03/03/2006
11	*
12	* SystemCmd's static exec method will spawn an external process to execute an external
13	* program or to launch a unix script or just execute a simple linux command.
14	* The output is captured and returned as string.
15	*
16	* Notes:
17	* - There are two versions of the exec method, one taking a String array and one just a String
18	* - If you want to launch a Unix script and especially use the < > \| piping options,
19	* you must invoke the command processor
20	* String[] cmd = {"/bin/sh", "-c", "ls > hello"};
21	* SystemCmd.exec(cmd);
22	* - If you need to pass arguments, it's safer to a String array especially if they contain spaces.
23	* String[] cmd = { "myProgram.exe", "-o=This is an option" };
24	* SystemCmd.exec(cmd);
25	*
26	* Changelog:
27	* 14/03/06 Added exec method to take only a string as argument by JD
28	* 03/03/06 first created/copied by IF
29	*/
30
31	public class SystemCmd {
32
33	public static String exec(String[] cmd) {
34	String output = "";
35	try {
36	String line = "";
37	Process p = Runtime.getRuntime().exec(cmd);
38	BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
39	while ((line = input.readLine()) != null) {
40	output = output + line + "\n";
41	}
42	input.close();
43
44	} catch (Exception err) {
45	err.printStackTrace();
46	}
47	return output;
48	}
49
50	public static String exec(String cmd) {
51	String output = "";
52	try {
53	String line = "";
54	Process p = Runtime.getRuntime().exec(cmd);
55	BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
56	while ((line = input.readLine()) != null) {
57	output = output + line + "\n";
58	}
59	input.close();
60
61	} catch (Exception err) {
62	err.printStackTrace();
63	}
64	return output;
65	}
66
67
68	}