Java : Simple Program to Create zip file.

It can be used to zip both a file or a Directory. Directory is ziped along with its subdirectory structure. Just Provide the proper source and run the code.


import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class CreateZip {
   
    //function to zip a single file
    //Parameters List :
    //zipSrc : source file which to be ziped
    //zipName : Give desire name to zip file
    //destination folder where to create zip file
    public void zipFile(File zipSrc,String zipName,String destFolder) {
       
        System.out.println("zipFile :: "+zipSrc.getPath()+" "+zipName+" "+destFolder);
       
        try {           
                   
            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(destFolder+File.separator+zipName));
                   
            FileInputStream fis = new FileInputStream(zipSrc);
           
            ZipEntry zipEntry = new ZipEntry(zipSrc.getName());
           
            zos.putNextEntry(zipEntry);
           
            int bytes = 0;
            byte[] buffer = new byte[2156];
           
            bytes = fis.read(buffer);
           
            while (bytes != -1) {
                zos.write(buffer, 0, bytes);
                bytes = fis.read(buffer);
            }
           
            fis.close();
            zos.flush();
            zos.close();
           
        } catch (Exception e) {
           
            System.out.println("Exception :: "+e);
           
        }
    }
   
    //function to zip a folder containing multiple files
    //Parameters List :
    //zipSrc : source folder which to be ziped
    //zipName : Give desire name to zip file
    //destination folder where to create zip file
    public void zipDirectory(File zipSrc,String zipName,String destFolder) {
       
        System.out.println("zipDirectory :: "+zipSrc.getPath()+" "+zipName+" "+destFolder);
       
        try {
           
            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(destFolder+File.separator+zipName));
           
            zipDirectoryUtil(zipSrc.getPath(),zos,"");
            zos.close();       
        }
        catch (Exception e) {
           
            e.printStackTrace();
        }
       
    }
   
    public void zipDirectoryUtil(String directory,ZipOutputStream zos,String path) {
       
        try {
           
            File zipDir = new File(directory);
           
            String[] allFiles = zipDir.list();
           
            int bytes = 0;
            byte[] buffer = new byte[2156];
           
            for (String eachFile : allFiles) {
               
                File file = new File(zipDir,eachFile);
               
                if(file.isDirectory()) {
                   
                    zipDirectoryUtil(file.getPath(),zos,path+file.getName()+File.separator);
                    continue;
                }
               
            FileInputStream fis = new FileInputStream(file);
           
            ZipEntry zipEntry = new ZipEntry(path+file.getName());
           
            zos.putNextEntry(zipEntry);
           
            bytes = fis.read(buffer);
           
            while (bytes != -1) {
                zos.write(buffer, 0, bytes);
                bytes = fis.read(buffer);
            }
            fis.close();
           
            }
        }
        catch (Exception e) {
           
            e.printStackTrace();
        }
    }
   
    public static void main(String[] args) {
       
        CreateZip obj = new CreateZip();
       
        obj.zipFile(new File("C:\\MY\\Code\\Photo.jpg"),"img.zip","D:\\Test\\data");
       
        obj.zipDirectory(new File("C:\\MY\\Code\\com"),"com.zip","D:\\Test\\data");

    }

}

Java : Simple Program for Unzipping a File

Just provide a zip file which to be unziped and run the code.


import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class Unziping {
  
    //Function to unzip a file, provide source zip file and destination directory where to unzip a file
    public void unzip(File zipFile,String destFolder) {
      
        System.out.println("Unzip :: "+zipFile.getPath()+" into "+destFolder);
      
        try {
            ZipFile zip = new ZipFile(zipFile);
          
            File dest = new File(destFolder);
          
            Enumeration files = zip.entries();
          
            File file;
            FileOutputStream fos;
          
            int bytes = 0;
            byte[] buffer = new byte[2156];
          
            while (files.hasMoreElements()) {
              
                ZipEntry entry = (ZipEntry)files.nextElement();
              
                InputStream eis = zip.getInputStream(entry);
                file = new File(dest.getAbsolutePath() + File.separator + entry.getName());
              
                if (entry.isDirectory()) {
                    file.mkdirs();
                    continue;
                }
                else {
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }
              
                fos = new FileOutputStream(file);
              
                while ((bytes = eis.read(buffer)) != -1) {
                    fos.write(buffer, 0, bytes);
                  }
              
                fos.close();              
            }          
          
        } catch (Exception e) {
          
            e.printStackTrace();
        }
    }
  
    public static void main(String[] args) {
      
        Unziping obj = new Unziping();
      
        obj.unzip(new File("C:\\MY\\Code\\com.zip"),"C:\\MY\\Code");
    }

}

JSP : Simple File Uploading Codes.

We will see how to upload a file using JSP, you can upload a file to your desire location with desire name. Please see the simple self explanatory codes below.

Please add below mentioned jar files in your applications classpath.

• commons-fileupload-1.2.jar (http://commons.apache.org/fileupload)
• commons-io-1.4.jar (http://commons.apache.org/io)

1st HTML interface (can be used in JSP as well)

FileUploadingInterface.HTML


<HTML>
<HEAD>
<TITLE>File Uploading Interface</TITLE>
</HEAD>
<BODY>
<center>
<h3>Simple File Uploading Example</h3>
<form action="ProcessUploadedFile.jsp" method="post" enctype="multipart/form-data">
Name <input type="text" name="userName"> (optional) </br></br>
File <input type="file" name="file1"> </br></br> <!-- Here You Can Add more numbers of Files For Uploading -->
<input type="submit" value="Submit">
</form>
</center>
</BODY>
</HTML>



2nd JSP code


ProcessUploadedFile.jsp


<%@ page import="java.io.*" %>
<%@ page import="java.util.*"%>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<%
boolean isMultipart = ServletFileUpload.isMultipartContent(request);

if (!isMultipart)
{
}
else
{
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List items = null;
try
{
items = upload.parseRequest(request);
}
catch (FileUploadException e)
{
e.printStackTrace();
}

Iterator itr = items.iterator();

while (itr.hasNext())
{
FileItem item = (FileItem) itr.next();

//Get Other Form Fileds Values in this Block
if (item.isFormField())
{
String itemName = item.getFieldName();
String itemValue = item.getString();
String name = "";
if (itemName.equals("userName"))
name = item.getString();

out.println("User Name "+name);
}
//Get File type Values Here, it could be one or multiple File
else
{
try
{
String itemName = item.getName();

//userFieldName is what u provided in html file
String userFieldName = item.getFieldName();

if(itemName != null)
{
if(itemName.equals(""))
{
//If Nothing Uploaded
out.println("No File Uploaded");
}
else
{
//Provide Destination Folder, Where Uploaded File to be saved
boolean folderMade = (new File("d:/UploadedFileFolder")).mkdirs();

// This is required to filter out file name from complete file path.
int idx = itemName.lastIndexOf("\\");

String filename = "";

if(idx > -1)
{
//in case of IE, it sends complete path. Hence only file name must be filtered out.
idx=idx+1;
filename = itemName.substring(idx);
}
else
{
//in case of other borwsers, its just filename
filename = itemName;
}

File savedFile = new File("d:/UploadedFileFolder/"+filename);
item.write(savedFile);

//Get path of the saved file
String path = savedFile.getPath();

out.println("File Uploaded Sucessfully "+path);

}
}
}//try
catch(Exception e)
{
e.printStackTrace();
}
}//else
}//while
}//else
%>

Java : Simple program to copy Directory (subdirectories and files) from specified source to specified destination.

Here is the code of the program :




import java.io.*;
import java.text.SimpleDateFormat;

public class DirectoryCopier
{
public static void main(String[] args) throws IOException
{
//Creating instance of DirectoryCopier
DirectoryCopier cd = new DirectoryCopier();

//Specifying Source Directory
String source = "D:\\Blog";

//Creating File of source directory
File src = new File(source);

//Specifying Destination Directory
String destination = "C:\\copyOfBlog";

File dst = new File(destination);

//Calling method DirectoryCopier with source and destination
cd.DirectoryCopier(src, dst);
}

public void DirectoryCopier(File srcPath, File dstPath) throws IOException
{
//If Source is a Directory
if (srcPath.isDirectory())
{
System.out.println(srcPath + "is directory.");

//If Destination directory not exists, create it
if (!dstPath.exists())
{
System.out.println("calling mkdir " + dstPath);
dstPath.mkdir();
}

//Get All Available Files in this source directory
String files[] = srcPath.list();

//Iterate each file
for(int i = 0; i < files.length; i++)
{
System.out.println("--Source "+srcPath);
System.out.println("--Destination "+dstPath);

//Recursively calling DirectoryCopier
DirectoryCopier(new File(srcPath, files[i]),new File(dstPath, files[i]));
}
}
//If Source is a leaf node
else
{
//If Source does not exists print it and exit
if(!srcPath.exists())
{
System.out.println("File or directory does not exist.");
System.exit(0);
}
else
{
System.out.println("Source "+srcPath);
System.out.println("Destination "+dstPath);

//Copying by bytes
FileInputStream in = new FileInputStream(srcPath);
FileOutputStream out = new FileOutputStream(dstPath);

// Transfer bytes from in to out
byte[] buf = new byte[1024];

int len;

while ((len = in.read(buf)) > 0)
{
out.write(buf, 0, len);
}

in.close();
out.close();
}

}
System.out.println("Directory copied.");
}
}

Java: Simple Program To Read Excel File

There are two simple methods, Below both programs produces same output

1st Method : Using POI (Note : Download POI to run this code)


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

import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;

public class ExcelReadIterator
{
public static void main(String[] args) throws Exception
{
InputStream ExcelFileToRead = new FileInputStream("ExcelFile.xls");
HSSFWorkbook wb = new HSSFWorkbook(ExcelFileToRead);

HSSFSheet sheet=wb.getSheetAt(0);
HSSFRow row;
HSSFCell cell;

Iterator rows=sheet.rowIterator();

while (rows.hasNext())
{
row=rows.next();
Iterator cells=row.cellIterator();
while (cells.hasNext())
{
cell=cells.next();

if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING)
{
System.out.print(cell.getStringCellValue()+" ");
}
else if(cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC)
{
System.out.print(cell.getNumericCellValue()+" ");
}
else
{
//U Can Handel Boolean, Formula, Errors
}
}
System.out.println();
}

}
}




2nd Method : Using Virtual DB (This is simple method, directly u can run this code)



import java.sql.*;

public class ReadExcel
{
public static void main (String[] args)
{
String ExcelFileToRead = "ExcelFile.xls";

try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Excel Driver (*.xls)};DBQ="+ExcelFileToRead);
Statement stmt = conn.createStatement();
ResultSet rset = stmt.executeQuery("Select * from [Sheet1$]");


while(rset.next())
{
System.out.println(rset.getString(1)+" "+rset.getString(2)+" "+rset.getString(3)) ;
}



}
catch(Exception ex)
{
ex.printStackTrace();
}
}


}