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Java – Run ssh commands in linux

admin — Sun, 20 Dec 2009 10:50:46 +0000

To execute ssh command in Linux, we need to use java API to run command at Unix machine. java ssh API is required to run linux commands through ssh with user Authentication.

This example will explain how to execute ssh in java.

Download ganymed ssh jar and set classpath before running program

import java.io.*;
import ch.ethz.ssh2.*;
public class JavaRunSshCommandExample {

    public static void main(String[] args) {

        String hostname = "127.0.0.1";
        String username = "root";
        String password = "password";

        boolean isAuthenticated = false;

        try
        {
            Connection conn = new Connection(hostname);

            conn.connect();

            isAuthenticated=conn.authenticateWithPassword(username, password);

            if (isAuthenticated == false)
                throw new IOException("Authentication failed.");

            Session sess = conn.openSession();

            sess.execCommand("cd /;ls -l> out.txt");

            InputStream stdout = new StreamGobbler(sess.getStdout());
            InputStream stderr = new StreamGobbler(sess.getStderr());

            InputStreamReader insrout=new InputStreamReader(stdout);
            InputStreamReader insrerr=new InputStreamReader(stderr);

            BufferedReader stdoutReader = new BufferedReader(insrout);

            BufferedReader stderrReader = new BufferedReader(insrerr);

            while (true)
            {
                String line = stdoutReader.readLine();
                if (line == null)
                {
                    break;
                }
                System.out.println(line);
            }

            while (true)
            {
                String line = stderrReader.readLine();
                if (line == null)
                {    break;}
                System.out.println(line);
            }

            sess.close();

            conn.close();
        }
        catch (IOException e)
        {
            e.printStackTrace(System.err);
            System.exit(2);
        }
    }
}

Other java ssh api

Download j2ssh api

JAVA – Read XML Taglib and JSTL in JSP

admin — Mon, 07 Dec 2009 10:43:07 +0000

XML Reading through JSTL tag and taglib library is very easy. We have to include JSTL libraries and it allows us to access XML through node.

Java XML Read fetching example explains how to use XML in JSP.

samle.xml

 
 
   
     New Delhi, India 
     3:30 PM 
   
   
     75 
     
       29.94 
       steady

xml_read.jsp

<%@ page contentType="text/html; charset=iso-8859-1" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<c:import url="http://localhost:8080/XML/samle.xml" var="xml"/>
<x:parse xml="${xml}" varDom="dom"/>
<html>
<head>
<title>Read XML through taglib JSTLtitle>
head>

<body>
      <x:forEach select="$dom/weather/cc/tmp" var="tmp">
        <x:out select="$tmp" />
    x:forEach>

    <br>

    <x:forEach select="$dom/weather/cc/bar/d" var="d">
        <x:out select="$d" />
    x:forEach>
body>
html>

Output

75
steady

Download XML Read Source code download

Java – For loop Example, For loop program

admin — Sun, 27 Sep 2009 11:40:06 +0000

Example of For loop in java

public class ForLoopJava {

    public static void main(String[] args) {

        for(int i=0;i<=10;i++)
        {
            System.out.println("for loop :"+i);
        }
    }
}

output

for loop :0
for loop :1
for loop :2
for loop :3
for loop :4
for loop :5
for loop :6
for loop :7
for loop :8
for loop :9
for loop :10

Free Real Estate Source Code

admin — Thu, 21 May 2009 09:31:43 +0000

Web based real estate

Real estate software is web based and designed on java technology. Coding is written in JSP, JavaScript, HTML, CSS, with MySql database.

Real estate property source code

Source code of real estate project is available freely. Source code of real estate

Real estate source code download

Source code of real estate is available freely for download. Download real estate

Java – How to escape String

admin — Thu, 21 May 2009 06:36:48 +0000

String in HTML should not contain special characters. If String contains special character, it should escape string using StringEscapeUtil class.
This class can escape special characters from String. Final string comes with HTML code.

Download apache commons api

import org.apache.commons.lang.StringEscapeUtils;

public class EscapeString {

    public static void main(String[] args) {

        String str=" tag's value  \"into\" html & tag";

        String escapedString=StringEscapeUtils.escapeHtml(str);

        System.out.println(escapedString);
    }
}

Output

<HTML> tag’s value "into" html text & tag

Tomcat – How to change port 8080

admin — Wed, 20 May 2009 05:48:20 +0000

Default port of tomcat is 8080, this port can be changed to any other port. Normally HTTP port is 80, tomcat port can change through server.xml in config folder of tomcat.

How to change tomcat port 8080

c:\tomcat\conf\server.xml

Search for this line

connectionTimeout="20000"
redirectPort="8443" />

Change to 8080 to your desire port Number

connectionTimeout="20000"
redirectPort="8443" />

After modification in server.xml file, tomcat must be restarted.

JSP Calendar

admin — Sun, 17 May 2009 09:53:34 +0000

This JSP calendar can easily work with any java web application. This is free JSP calendar software for download and use. If you want to use calendar in your application you can use this calendar in JSP application. In this calendar, we can change year and month to go back and forward to option of calendar. Value of year and month in calendar can be changed by in combo box code.

<%@ page  language="java" import="java.util.*,java.text.*"%>
<%!
public int nullIntconv(String inv)
{   
    int conv=0;
        
    try{
        conv=Integer.parseInt(inv);
    }
    catch(Exception e)
    {}
    return conv;
}
%>
<%
 int iYear=nullIntconv(request.getParameter("iYear"));
 int iMonth=nullIntconv(request.getParameter("iMonth"));

 Calendar ca = new GregorianCalendar();
 int iTDay=ca.get(Calendar.DATE);
 int iTYear=ca.get(Calendar.YEAR);
 int iTMonth=ca.get(Calendar.MONTH);

 if(iYear==0)
 {
      iYear=iTYear;
      iMonth=iTMonth;
 }

 GregorianCalendar cal = new GregorianCalendar (iYear, iMonth, 1); 

 int days=cal.getActualMaximum(Calendar.DAY_OF_MONTH);
 int weekStartDay=cal.get(Calendar.DAY_OF_WEEK);
 
 cal = new GregorianCalendar (iYear, iMonth, days); 
 int iTotalweeks=cal.get(Calendar.WEEK_OF_MONTH);
  
%>
<html>
<head>
<title>How to create Calendar in JSPtitle>
<script>
function goTo()
{
  document.frm.submit()
}
script>
<style>
body
{
 font-family:Verdana, Arial, Helvetica, sans-serif
}
.dsb
{
 background-color:#EEEEEE
}
style>
head>

<body>
<form name="frm" method="post">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="25%">&nbsp;td>
    <td width="45%">&nbsp;td>
    <td width="30%">&nbsp;td>
  tr>
  <tr>
    <td>&nbsp;td>
    <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td width="6%">Yeartd>
        <td width="7%">
        <select name="iYear" onChange="goTo()">
        <%
        // start year and end year in combo box to change year in calendar
        for(int iy=iTYear-70;iy<=iTYear+70;iy++)
        {
          if(iy==iYear)
          {
            %>
          <option value="<%=iy%>" selected="selected"><%=iy%>option>
          <%
          }
          else
          {
            %>
          <option value="<%=iy%>"><%=iy%>option>
          <%
          }
        }
       %>
        select>td>
        <td width="73%" align="center" style="color:#4E96DE"><h3><%=new SimpleDateFormat("MMMM").format(new Date(2008,iMonth,01))%> <%=iYear%>h3>td>
        <td width="6%">Monthtd>
        <td width="8%">
        <select name="iMonth" onChange="goTo()">
        <%
        // print month in combo box to change month in calendar
        for(int im=0;im<=11;im++)
        {
          if(im==iMonth)
          {
         %>
          <option value="<%=im%>" selected="selected"><%=new SimpleDateFormat("MMMM").format(new Date(2008,im,01))%>option>
          <%
          }
          else
          {
            %>
          <option value="<%=im%>"><%=new SimpleDateFormat("MMMM").format(new Date(2008,im,01))%>option>
          <%
          }
        }
       %>
        select>td>
      tr>
    table>td>
  tr>
  <tr>
    <td><table align="center" border="1" cellpadding="3" cellspacing="0" width="100%">
      <tbody>
        <tr>
          <th>Sunth>
          <th>Month>
          <th>Tueth>
          <th>Wedth>
          <th>Thuth>
          <th>Frith>
          <th>Satth>
        tr>
        <%
        int cnt =1;
        for(int i=1;i<=iTotalweeks;i++)
        {
        %>
        <tr>
          <% 
            for(int j=1;j<=7;j++)
            {
                if(cnt<weekStartDay || (cnt-weekStartDay+1)>days)
                {
                 %>
                <td align="center" height="35" class="dsb">&nbsp;td>
               <% 
                }
                else
                {
                 %>
                <td align="center" height="35" id="day_<%=(cnt-weekStartDay+1)%>"><span><%=(cnt-weekStartDay+1)%>span>td>
               <% 
                }
                cnt++;
              }
            %>
        tr>
        <% 
        }
        %>
      tbody>
    table>td>
  tr>
table>td>
    <td>&nbsp;td>
  tr>
  <tr>
    <td>&nbsp;td>
    <td>&nbsp;td>
    <td>&nbsp;td>
  tr>
table>
form>
body>
html>

Download source code JSP Calendar

How to compare date in JAVA

admin — Wed, 13 May 2009 10:11:42 +0000

Date is an important part of application. Comparing date in java is easy option with java.util.Date class method. Date can be compared with two date object of java. compareTo() method is used to compare date.

compareTo() method returns 3 option in numeric value.

Return 0, means dates are equal
Return 1, if first date is greater than second date
Return -1, if first date is less than second date

Example of comparing date in JSP

<%@ page language="java" import="java.util.*" %>
<%
  java.util.Date date1=new java.util.Date("05/21/2009");
  java.util.Date date2=new java.util.Date("05/21/2009");
%>
<html>
  <head>
    <title>How to compare date in javatitle>
  head>
  <body>
  <%
   out.println("date1 :"+date1);
   out.print("
");
   out.println("date2 :"+date2);
   out.print("
");
   out.println(date1.compareTo(date2));
   
   if(date1.compareTo(date2)<0)
   {
       // return -1 if date1 is less than date2
       out.println("
1. Date1 is less than date2");  
   }
   else if(date1.compareTo(date2)>0)
   {
       // return 1 if date1 is greater than date2
       out.println("
1. Date1 is greater than date2");  
   }
   else
   {
       // return 0 if date1 is equal to date2
       out.println("
1. Date1 is equal to date2");  
   }
   
   /// other ways to comparing date
   if(date1.after(date2))
   {
       //  if date1 is greater than date2
       out.println("
2. Date1 is greater than date2");
   }
   else if(date1.before(date2))
   {
       // if date1 is less than date2
       out.println("
2. Date1 is less than date2");   
   }
   else if(date1.equals(date2))
   {
       // if date1 is equal to date2
       out.println("
2. Date1 is equal to date2");  
   }
  %>
  body>
html>

How to Find Operating System in JAVA

admin — Wed, 13 May 2009 06:55:23 +0000

Java can find operating system of the machine where java program is executing. getProperty() is a method which find the system properties of the computer. OS property returns a String name of operating system platform.
We can detect the various operating systems in java. This operating system can be Linux, Window, Mac and other server version.

Example to find operating System in JSP

<%@ page language="java"%>
<html>
<head>
<title>How to find Operating System in JSPtitle>
head>

<body>
<%
 // This will return operation system name
 out.println("Operating System :"+System.getProperty("os.name"));
%>
body>
html>

How to find word in JAVA

admin — Wed, 13 May 2009 05:44:31 +0000

Word in string can be find by indexOf of method in java. This method returns a numeric value of word's position in a string. First character of the string positioned at zero number. If no word is found in string, it will return value less than 0.

Example of finding word in java.

<%@ page language="java"%>
<%
 String str="This is long string to find word in jsp";
%>
<html>
<head>
<title>How to find word in Javatitle>
head>

<body>
<%
// Searching long word in string

 if(str.indexOf("long")>=0)
 {
    out.print("Yes word is found successfully");
 }
 else
 {
    out.print("No word is found successfully");
 }
%>
body>
html>