Parsing XML string or content using java code

The following program is an example for parsing the XML string using code.

import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.CharacterData;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class XMLParse {
  public static void main(String arg[]) throws Exception{
    String xmlRecords = "A"
        + "";

    DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    InputSource is = new InputSource();
    is.setCharacterStream(new StringReader(xmlRecords));

    Document doc = db.parse(is);
    NodeList nodes = doc.getElementsByTagName("employee");

    for (int i = 0; i < nodes.getLength(); i++) {
      Element element = (Element) nodes.item(i);

      NodeList name = element.getElementsByTagName("name");
      Element line = (Element) name.item(0);
      System.out.println("Name: " + getCharacterDataFromElement(line));

      NodeList title = element.getElementsByTagName("title");
      line = (Element) title.item(0);
      System.out.println("Title: " + getCharacterDataFromElement(line));
    }

  }

  public static String getCharacterDataFromElement(Element e) {
    Node child = e.getFirstChild();
    if (child instanceof CharacterData) {
      CharacterData cd = (CharacterData) child;
      return cd.getData();
    }
    return "";
  }
}


Reading CSV using java program

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.StringTokenizer;

public class ReadCSV {

//readCSV class starts here

public static void main(String args[]) throws IOException

{ //main method starts

String fName = "test1.csv";//csv file which u wanna read

String thisLine; //string variable which take each record at a time

int count=0; //to count no. of records

FileInputStream fis = new FileInputStream(fName);
//A FileInputStream obtains input bytes from a file in a file system

DataInputStream myInput = new DataInputStream(fis);
/*data input stream lets an application read primitive Java data types
from an underlying input stream in a machine-independent way*/

while ((thisLine = myInput.readLine()) != null)
{ //beginning of outer while loop
StringTokenizer st =new StringTokenizer(thisLine,",");
while(st.hasMoreElements()){
String field = st.nextToken();
System.out.print(field+", ");
}
System.out.println();

} //ending of outer while loop
} //main method ends
} //readCSV class ends here

How to zip the files using java code

The following will show you how to zip the files using java code. This program will zip the files in the folder "TEST" in C drive.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
public class Zip {
static final int BUFFER = 2048;
public static void main (String argv[]) {
try {
BufferedInputStream origin = null;
FileOutputStream dest = new
FileOutputStream("c:/myzip.zip");
ZipOutputStream out = new ZipOutputStream(new
BufferedOutputStream(dest));
//out.setMethod(ZipOutputStream.DEFLATED);
byte data[] = new byte[BUFFER];
// get a list of files from current directory
File f = new File("c:/test");
String files[] = f.list();
for (int i=0; i(lessthan)files.length; i++) {
System.out.println("Adding: "+files[i]);
FileInputStream fi = new
FileInputStream("c:/test/"+files[i]);
origin = new
BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(files[i]);
out.putNextEntry(entry);
int count;
while((count = origin.read(data, 0,
BUFFER)) != -1) {
out.write(data, 0, count);
}
origin.close();
}
out.close();
} catch(Exception e) {
e.printStackTrace();
}
}
}

Reading XLS Content Using Java Code.

Reading XLS Content Using Java Code.

We can read XLS content cell by cell by using java code.For this we need jxl jar file.

The following is the simple example to read .xls file and display its content.

Following is the link to download jxl jar file
http://fisheye1.cenqua.com/viewrep/jptools/jpTools/lib




import java.io.File;
import java.io.*;
import jxl.*;
import java.util.*;
import jxl.Workbook;
import jxl.read.biff.*;


class ReadXls
{
public static void main(String[] args)
{
try
{
String filename = "C:/ExcelFileName.xls";
WorkbookSettings ws = new WorkbookSettings();
ws.setLocale(new Locale("en", "EN"));

Workbook workbook = Workbook.getWorkbook( new File(filename),ws);

Sheet s = workbook.getSheet(0);
System.out.println("Sheet Content::"+s.getName());
readDataSheet(s);
workbook.close();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (BiffException e)
{
e.printStackTrace();
}
private static void readDataSheet(Sheet s)
{
// Find the labeled cell from sheet
System.out.println(lc.getString());

//gets the value of cell at specified column and row
DateCell dc = (DateCell) s.getCell(20,1);
System.out.println(dc);

}
}

Reading XML from another Site using Java code

import="com.sun.org.apache.xerces.internal.util.URI"
import="java.io.InputStream"
import="java.net.URL"
import="javax.xml.parsers.DocumentBuilderFactory"
import="javax.xml.parsers.DocumentBuilder"
import="org.w3c.dom.Document"
import="org.w3c.dom.NodeList"
import="org.w3c.dom.NamedNodeMap"
import="org.w3c.dom.Node"

URL url= new URL("www.google.com");
InputStream in=url.openStream();
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
Document document=builder.parse(in);

If you want to get retrive entire node list that can be done by

NodeList nodeList=document.getElementsByTagName("NameofTheNode");

By these all the node will come in that Node List.
If you want to retrive the attributes with in that Node,that can be done by

Node node= nodeList.item(indx);
NamedNodeMap nnm=node.getAttributes();
String href=nnm.getNamedItem("AttributeNamewithinthatNode").getNodeValue();

Resize or Cropping of an Image for a fixed Width and Height using Java code

To resize an image for a fixed length and width.... provide,length and width to resize the image returns the new width and height ratio for that image .Take the return parameter split by "." .


import java.awt.Image;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.swing.ImageIcon;

public class ImageResize
{
int setWidth;
int setHeight;
com.jiva.application.auth.AppSession appSession;
public void setWidth(int width)
{
setWidth=width;
}
public void setHeight(int height)
{
setHeight=height;
}

public String imageProps(String path) throws FileNotFoundException, IOException
{
File source=new File(path);
Image inImage = new ImageIcon(source.getAbsolutePath()).getImage();
int imageWidth=inImage.getWidth(null);
int imageHeight=inImage.getHeight(null);
inImage.flush();
int returnImageWidth=setWidth;
int returnImageHeight=setHeight;
double ReturnImageRatio = (double)returnImageWidth/ (double)returnImageHeight;
double ImageRatio = (double)imageWidth / (double)imageHeight;
if (ReturnImageRatio < ImageRatio))
{
returnImageHeight = (int)((double)returnImageWidth / ImageRatio);
}
else
{
returnImageWidth = (int)((double)returnImageHeight * ImageRatio);
}
String x=Integer.toString(returnImageWidth)+"."+Integer.toString(returnImageHeight);

return x;
}
}