JAR Generation

Hi,

I have done this code. Can u pls tell me how to create a jar for this in eclipse, this is only a single java file?

package com.dcp.ui;

import java.awt.BorderLayout; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import java.io.File; import java.io.FilePermission; import java.io.FilenameFilter; import java.io.IOException; import java.sql.Array; //import java.nio.file.Files; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollBar; import javax.swing.SwingUtilities; import javax.swing.filechooser.FileFilter;

import jxl.Cell; import jxl.Sheet; import jxl.Workbook; import jxl.biff.WorkspaceInformationRecord; import jxl.read.biff.BiffException; import jxl.write.Label; import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; import jxl.write.WriteException;

public class DcpRep //implements ActionListener { JLabel label = new JLabel(); private static void createAndShowGUI() { // make frame.. frame = new JFrame("Select"); frame.setDefaultCloseOperation(JFrame.EXITONCLOSE); frame.setBounds(20,30,700,700); frame.getContentPane().setLayout(null); jb = new JButton("Browse"); jb.setBounds(200, 250, 100, 50); frame.getContentPane().add(jb); jb2=new JButton("Generate"); jb2.setBounds(20, 20, 100, 50); frame.getContentPane().add(jb2); frame.setVisible(true); jb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) {

                JFileChooser jf = new JFileChooser();
                /*FileFilter filt = new FileFilter() {

                    @Override
                    public String getDescription() {
                        // TODO Auto-generated method stub
                        return null;
                    }

                    @Override
                    public boolean accept(File arg0) {
                        // TODO Auto-generated method stub
                        return false;
                    }
                };*/
                /*FilenameFilter filter = new FilenameFilter() {

                    @Override
                    public boolean accept(File arg0, String arg1) {
                        // TODO Auto-generated method stub
                        return false;
                    }
                };
                    filter.accept(file, "xls");*/
                    //filter.addExtension("xlsx");
                    //filter.setDescription("xls & xlsx sheets");
                    //jf.setFileFilter(filt);

                //jf.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                jf.setMultiSelectionEnabled(true);
                returnVal = jf.showOpenDialog(frame);
                File[] file = jf.getSelectedFiles();

                //      int returnVal2 = jf.showSaveDialog(frame);
                //  System.out.println(returnVal2);
                flength=file.length;
                System.out.println(file.length);

                for(int f=0;f<file.length;f++)
                {

                    Workbook workbook;
                    try {
                        workbook=Workbook.getWorkbook(file[f]);
                        Sheet sheet=workbook.getSheet(0);
                        r[f]=sheet.getRows();
                        c=sheet.getColumns();

                        //arr = new String[20][c][r[f]];


                        for(int i=0;i<c;i++)
                        {
                            for(int j=0;j<r[f];j++)
                            {
                                if(j<500)
                                {
                                Cell a=sheet.getCell(i,j);  
                                arr[f][i][j]=a.getContents();
                                //System.out.println(arr[f][i][j]);
                                }
                                else if((j>500)&&(j<1000))
                                {

                                    Cell b=sheet.getCell(i,j);  
                                    brr[f][i][j-500]=b.getContents();
                                    //System.out.println(brr[f][i][j-500]);

                                }
                                else if((j>1000)&&(j<1500))
                                {

                                    Cell c=sheet.getCell(i,j);  
                                    crr[f][i][j-1000]=c.getContents();
                                    //System.out.println(brr[f][i][j-500]);

                                }

                            }
                        }

                    }catch (BiffException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    } catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                }   



        }       });
    jb2.addActionListener(new ActionListener()
    {
        public void actionPerformed(ActionEvent e)
        {if(returnVal == JFileChooser.APPROVE_OPTION) 
        {
            WritableWorkbook generate;
            try {
                generate=Workbook.createWorkbook(new File("C:/Users/Jai Badri Vishal/Desktop/opt.xls"));
                WritableSheet st=generate.createSheet("First Sheet",0);
                for(int f=0;f<flength;f++)
                {

                    System.out.println("r is "+r[f]);
                    //System.out.println("Iteration no "+f);
                    for(int k=0;k<c;k++)
                    {
                        for(int j=y, x=0;j<y+r[f];x++,j++)
                        {
                            if(x<500)
                            {
                            Label label=new Label(k,j,arr[f][k][x]);
                            st.addCell(label);
                            //System.out.println(arr[f][k][j]);
                            }
                            else if((x>500)&&(x<1000))
                            {
                                Label label=new Label(k,j,brr[f][k][x-500]);
                                st.addCell(label);
                                //System.out.println(brr[f][k][j-500]);
                            }
                            else if((x>1000)&&(x<1500))
                            {
                                Label label=new Label(k,j,crr[f][k][x-1000]);
                                st.addCell(label);
                                //System.out.println(brr[f][k][j-500]);
                            }
                        }
                    }y=y+r[f];

                }
                generate.write();
                generate.close();   
            } catch (WriteException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } catch (IOException e2) {
                // TODO Auto-generated catch block
                e2.printStackTrace();
            }
        } }
    });    
}
public static void main(String[] args) {
    // start off..
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI();
        }
    });
}
static JButton jb,jb2;
static JFrame frame;
static int c,y,flength;
static int r[]=new int[20];
static String arr[][][]=new String[100][500][500];
static String brr[][][]=new String[100][500][500];
static String crr[][][]=new String[100][500][500];
static File file,p;
static int returnVal;

}

View Answers

May 7, 2012 at 11:35 AM

A Jar file combines several classes into a single archive file. Basically,library classes are stored in the jar file. Through the given code you can create your own jar file.

import java.io.*;
    import java.util.jar.*;

    public class CreateJar {
      public static int buffer = 10240;
      protected void createJarArchive(File jarFile, File f) {
        try {
          byte b[] = new byte[buffer];
          FileOutputStream fout = new FileOutputStream(jarFile);
          JarOutputStream out = new JarOutputStream(fout, new Manifest());

            JarEntry addFiles = new JarEntry(f.getName());
            addFiles.setTime(f.lastModified());
            out.putNextEntry(addFiles);

            FileInputStream fin = new FileInputStream(f);
            while (true) {
              int len = fin.read(b, 0, b.length);
              if (len <= 0)
                break;
              out.write(b, 0, len);
            }
            fin.close();

          out.close();
          fout.close();
          System.out.println("Jar File is created successfully.");
        } catch (Exception ex) {}
      }
      public static void main(String[]args){
        CreateJar jar=new CreateJar();
        File folder = new File("c:/");
          File files = new File("c:/DcpRep .java");
        File file=new File("c:/Example.jar");
        jar.createJarArchive(file, files);
      }
    }

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