diff options
Diffstat (limited to 'WEB-INF/classes/SciExec.java')
| -rwxr-xr-x | WEB-INF/classes/SciExec.java | 158 |
1 files changed, 78 insertions, 80 deletions
diff --git a/WEB-INF/classes/SciExec.java b/WEB-INF/classes/SciExec.java index 42c185a..5f83cb8 100755 --- a/WEB-INF/classes/SciExec.java +++ b/WEB-INF/classes/SciExec.java @@ -1,11 +1,12 @@ -/* - Servlet code for xcos-on-web - Authors: Maverick and Adhitya - Description: - The following servlet creates a shell command to run Scilab without any GUI/simulation window. - The diagram sent from client is stored in a usr-xxx.xcos file and is then simulated. The result - is a .png file which is then sent back to the client. -*/ +/** + * Servlet code for xcos-on-web + * Authors: Maverick and Adhitya + * Description: Thefollowing servlet creates a shell command to run Scilab + * without any GUI/simulation window. The diagram sent from client + * is stored in a usr-xxx.xcos file and is then simulated. + * The result is a .png file which is then sent back to the client. + */ + import java.io.*; import javax.servlet.*; import java.util.*; @@ -17,55 +18,48 @@ import java.util.List; import org.apache.commons.io.IOUtils; import org.apache.commons.io.FilenameUtils; - public class SciExec extends GenericServlet { - - public void service(ServletRequest request,ServletResponse response) throws ServletException, IOException - { + public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { PrintWriter pw = response.getWriter(); - InputStream is = null; ByteArrayOutputStream baos = null; List<String> commands = new ArrayList<String>(); - /* - Maverick & Srikant sir. - Creating a shell command to run Scilab without any GUI so that the simulation window doesn't appear. - */ + /** + * Maverick and Srikant: + * Creating a shell command to run Scilab without + * any GUI so that the simulation window doesn't appear. + */ commands.add("scilab-adv-cli"); commands.add("-noatomsautoload"); commands.add("-nogui"); commands.add("-nb"); commands.add("-e"); - String imagePath=""; - String fileNameWithoutExt=""; - - /* - Maverick - Ignore the following comments. - */ - - //---IGNORE--- - /* - commands.add("plot3d();xs2png(gcf(),'img2.png');exit();"); - String data=request.getParameter("name"); - pw.println(data); - commands.add("echo "+data+" > /home/saarang/Softwares/apache-tomcat-8.0.36/webapps/sci/servlet/file.xcos"); - commands.add("driver('PNG');xinit('/home/saarang/apache-tomcat-8.0.36/webapps/worknogui/servlet/ans"+k+".png');loadXcosLibs();importXcosDiagram('/home/saarang/apache-tomcat-8.0.36/file.xcos');xcos_simulate(scs_m,4);mode(2);xend();quit();"); - */ - //--IGNORE till here--- - + String imagePath = ""; + String fileNameWithoutExt = ""; + /** + * Maverick: + * Ignore the following block. + */ + /** + * commands.add("plot3d();xs2png(gcf(),'img2.png');exit();"); String + * data=request.getParameter("name"); pw.println(data); + * commands.add("echo "+data+" > + * /home/saarang/Softwares/apache-tomcat-8.0.36/webapps/sci/servlet/file.xcos"); + * commands.add("driver('PNG');xinit('/home/saarang/apache-tomcat-8.0.36/webapps/worknogui/servlet/ans"+k+".png');loadXcosLibs();importXcosDiagram('/home/saarang/apache-tomcat-8.0.36/file.xcos');xcos_simulate(scs_m,4);mode(2);xend();quit();"); + */ ProcessBuilder pb = new ProcessBuilder(commands); - try - { + try { InputStream inputStream = request.getInputStream(); - /* - Adhitya - Creating a temporary file in the directory containing tomcat. This file is the .xcos file which will be executed by the Scilab engine. - */ + /** + * Adhitya: + * Creating a temporary file in the directory containing + * tomcat. This is the .xcos file which will be executed by the + * Scilab engine. + */ File xcosFile = File.createTempFile("usr-", ".xcos"); OutputStream outputStream = new FileOutputStream(xcosFile); IOUtils.copy(inputStream, outputStream); @@ -75,59 +69,63 @@ public class SciExec extends GenericServlet { String parentPath = xcosFile.getParent(); fileNameWithoutExt = FilenameUtils.removeExtension(xcosFile.getName()); - - /* - Maverick - The resultant .png file which is produced as a result of simulation is stored in a different folder inside the respective webapp directory. - The path of the folder is /path/to/webapp/servlet. - - TODO: Modify the following path. - */ - imagePath = "/path/to/webapps/xcos-on-web/servlet"+File.separator + fileNameWithoutExt + ".png"; - - /* - Maverick - Creating the command which is to be executed using terminal. - */ - commands.add("driver('PNG');xinit('"+imagePath+"');loadXcosLibs();importXcosDiagram('"+tempPath+"');xcos_simulate(scs_m,4);mode(2);xend();quit();"); - - /* - Maverick - Reference: www.stackoverflow.com - Starting a process to execute the created command. - */ + + /** + * Maverick: + * The resultant .png file which is produced as a result of + * simulation is stored in a different folder inside the respective + * webapp directory. The path of the folder is + * /path/to/webapp/servlet. + * + * @ToDo: Modify the following path. + */ + imagePath = "/path/to/webapps/xcos-on-web/servlet" + File.separator + fileNameWithoutExt + ".png"; + + /** + * Maverick: + * Creating the command which is to be executed using terminal. + */ + commands.add("driver('PNG');xinit('" + imagePath + "');loadXcosLibs();importXcosDiagram('" + tempPath + "');xcos_simulate(scs_m,4);mode(2);xend();quit();"); + + /** + * Maverick: + * Reference: http://stackoverflow.com/questions/23086778/how-to-access-unix-shell-special-variables-using-java + * Starting a process to execute the created command. + */ Process prs = pb.start(); is = prs.getInputStream(); byte[] b = new byte[1024]; int size = 0; baos = new ByteArrayOutputStream(); - while((size = is.read(b)) != -1){ + while ((size = is.read(b)) != -1) { baos.write(b, 0, size); } System.out.println(new String(baos.toByteArray())); - - } - catch (IOException e) - { + } + catch (IOException e) { e.printStackTrace(); - } - catch(Exception e) - { + } + catch (Exception e) { pw.println("Exception"); } - finally - { + finally { try { - if(is != null) is.close(); - if(baos != null) baos.close(); - } catch (Exception ex){} + if (is != null) { + is.close(); + } + if (baos != null) { + baos.close(); + } + } + catch (Exception ex) { + } } - /* - Maverick - Accessing the .png file and sending it to the client. - */ - pw.println("servlet/"+fileNameWithoutExt+".png"); + /** + * Maverick: + * Accessing the .png file and sending it to the client. + */ + pw.println("servlet/" + fileNameWithoutExt + ".png"); pw.close(); } } |