If you are giving some programming tips in your blogs means you will give sample programs related that article.but if copy and paste sample code from some another location or you will type that
Code
Most of the time your code won’t display in correct format.if you facing this problem this article will help you.
Select the programs and Click Quote button in the blogger toolbar.
Here is an example shows how to execute the shell scripts from java programs.
If you want to execute the below program set the java path in Unix environment.
export PATH=$PATH:/usr/jdk1.5.0/bin
export CLASSPATH=$CLASSPATH:/usr/jdk1.5.0/bin
create a shell script like shellscript.sh
#!/bin/bashclearecho "Good morning, world."
then change the permission for this script.if you execute the shell script you need execute permission.
chmod 777 shellscript.sh
try
./shellscript.sh
From java program
import java.io.IOException;
public class JavaScript {
public static void main(String[] args) {
try {
Runtime.getRuntime().exec("/root/shellscript.sh");
System.out.println("Working Fine");
} catch (IOException e) {
e.printStackTrace();
}
}
}
Blog templates are important for blog to become more popular.For new blogger, they usually start blogging from existing templates available in the blogger or wordpress.
Before you start blogging choose the right template for your blog topic and blog intention.if you like to earn something from blog(using adsense or other ads) means choosing right template is more important,otherwise if you chose a template and started writing about something and later you planning to change means you may lose some widgets or scripts.
There are lot of customized templates are available for BlogSpot and wordpress.
http://www.eblogtemplates.com/
http://webtalks.blogspot.com/2007/04/downlaod-three-column-new-blogger.html
3 column templates are most popular design templates,especially minima series and 3 column rounder series are commonly used blog templates.
above templates are well suits for adsense also.
After template selection add some featured widgets for your blog it will useful for you.
wowzio live activity feed widgets and more widgets are available in
wowzio.
related post
http://techieidea.blogspot.com/2009/11/best-blog-widgets.html
or you can use feedjit live widjet.
and add some more suitable widgets for your blog and customize your template as you wish.
SimpleDateFormat Example
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateFormatExample {
public static void main(String args[]) {
Date date = new Date();
String DATE_FORMAT = "MM:dd:yyyy";
// or
// String DATE_FORMAT = "MM/dd/yyyy";
SimpleDateFormat simDateFormat = new SimpleDateFormat(DATE_FORMAT);
System.out.println("Today is " + simDateFormat.format(date));
// or If you want display time with AM/PM
String TIME_FORMAT = "HH:mm:ss a";
SimpleDateFormat timeFormat = new SimpleDateFormat(TIME_FORMAT);
System.out.println("Now time is " + timeFormat.format(date));
// Today date and Time
System.out.println("Date and time is " + simDateFormat.format(date)
+ " " + timeFormat.format(date));
}
}
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class StrToDate {
public static void main(String[] args) {
String stri = "18/12/2009";
DateFormat simDateForm = new SimpleDateFormat("dd/MM/yyyy");
Date dstr;
try {
dstr = (Date) simDateForm.parse(stri);
System.out.println("Date is" + dstr);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Google Chrome Extensions
Add new features to google chrome by adding extensions (beta). But these features are useful for some people, but not for all.
Extensions currently available for Windows and Linux.
Most Popular Features
1.Google Mail Checker
It is displays the number of unread messages in your Google Mail inbox.
2. AdThwart
we can blocks ads on websites using this feature.
3.Dotspots
Dotspots is an annotation service.It is also useful for blogger.
You can connect blog posts, links, photos, videos and docs to any text on the web or into your social stream for all to see.
You can add these extensions by clicking bottom right corner of your google chrome browser.
5.Google Wave Notifier
Add the above the extensions and make your google chrome browser as more powerful.
Like a serial port we can communicate with USB from java application
Each USB port on a computer is assigned a unique identification number (port ID) by the USB controller. When a USB device is attached to a USB port, this unique port ID is assigned to the device.
Communication on the USB network can use any one of four different data transfer types:
Control transfers: These are short data packets for device control and configuration, particularly at attach time.
Bulk transfers: These are data packets in relatively large quantities. Devices like scanners or SCSI adapters use this transfer type.
Interrupt transfers: These are data packets that are polled periodically. The host controller will automatically post an interrupt at a specified interval.
Isochronous transfers: These are data streams in real time with higher requirements for bandwidth than for reliability. Audio and video devices generally use this transfer type.
We can modify the look and feel of java GUI components,Here is an example used to implement the look and feel concepts in java programs.
Using below code we can set the operating systems look and feel.
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class LookAndFeel {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception ex) {
ex.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createTheGUIComponents();
}
private void createTheGUIComponents() {
// Your implementation here…
}
});
}
}
We can also set the lot of GUI skins using substance.jar.
Download the latest substance.jar using below link
http://weblogs.java.net/blog/2005/12/29/swinging-java-ides
Add the above jar file in java classpath.
The problem shall be because of the following reasons.
Solutions:-
The problem can be solved by removing unwanted usage of Collection classes (Vector, Hashtable etc…) and avoiding usage of loops in the run method of threads which leads to high CPU usage.
1. HeidiSQL
HeidiSQL is an user friendly and open source tool for popular MYSQL Database. It is used to handle and browse your databases and tables from an Windows interface.
You can get this tool in the following location.
Download Location
http://www.heidisql.com/download.php
or
http://www.softpedia.com/get/Internet/Servers/Database-Utils/HeidiSQL.shtml
Features:-
HeidiSQL Features
2.Toad
Toad is a another very good tool available for all the databases like Oracle,SQL server,DB2,My SQL.
Toad is a fast and easier tool and it has lot of features.
http://www.toadsoft.com/lic_agree.html
3.Oracle SQL Developer
Oracle SQL Developer is a free and graphical tool for database development.
http://www.oracle.com/technology/products/database/sql_developer/index.html
( . indicates current path )
import java.util.StringTokenizer;
public class PINGMain {
String ipaddress = null;
boolean defragment = false;
int num = 2;
String success ="success";
private String destination;
private String packetSize;
private String bytes;
private String time;
private String ttl;
protected native String ping(String[] ipaddress);
public PINGMain() {
super();
try {
System.loadLibrary("ping");
} catch (UnsatisfiedLinkError e) {
e.printStackTrace();
}
singlePing();
}
private void singlePing() {
int a = 10;
int b = 20;
String string=null;
while(true) {
string = ping(ipaddr);
//System.out.println(string);
StringTokenizer strToken = new StringTokenizer(string);
int numToken = strToken.countTokens();
destination = strToken.nextToken();
bytes = strToken.nextToken();
time= strToken.nextToken();
ttl = strToken.nextToken();
System.out.println("\n Reply from"+" "+destination+" "+"bytes"+" "+bytes+" "+"Time"+" "+time+" "+"TTL"+" "+ttl);
}
}
private String continuousPing() {
return null;
}
private String disconnect() {
//unLoadPing();
//System.out.println("Unloaded SuccessFully");
return success;
}
private void unLoadPing() {
// unLoad();
}
/**
* @return
*/
private String getStatistics() {
return null;
}
public static void main(String ar[]) {
new PINGMain();
}
}
javac PINGMain.java
This command will generate a PINGMain.class file in the current directory.
javah -jni PINGMain
Step 4:
Writing the C implementation (PINGMain.c) of the native method
The JNI-style header file generated by javah helps you to write C or C++ implementations for the native method. The function that you write must follow the -prototype specified in the generated header file.
#pragma comment(lib, "wsock32.lib")
#include "jni.h"
#include "com_dtt_traffic_ping_PINGMain.h"
#include "stdlib.h"
#include "StdAfx.h"
#include <windows.h>
#include <winsock.h>
#include <stdio.h>
#include <string.h>
int packetsize;
int count;
char *data;//Ping info
typedef struct tagIPINFO
{
u_char Ttl; // Time To Live
u_char Tos; // Type Of Service
u_char IPFlags; // IP flags
u_char OptSize; // Size of options data
u_char FAR *Options; // Options data buffer
}IPINFO, *PIPINFO;
typedef struct tagICMPECHO
{
u_long Source; // Source address
u_long Status; // IP status
u_long RTTime; // Round trip time in milliseconds
u_short DataSize; // Reply data size
u_short Reserved; // Unknown
void FAR *pData; // Reply data buffer
IPINFO ipInfo; // Reply options
}ICMPECHO, *PICMPECHO;
// ICMP.DLL Export Function Pointers
HANDLE (WINAPI *pIcmpCreateFile)(VOID);
BOOL (WINAPI *pIcmpCloseHandle)(HANDLE);
DWORD (WINAPI *pIcmpSendEcho)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD);
//
//
char *pingFun(char *dest[])
{
int timeout;
char ping_Resp[2048];
WSADATA wsaData; // WSADATA
ICMPECHO icmpEcho; // ICMP Echo reply buffer
HANDLE hndlIcmp; // LoadLibrary() handle to ICMP.DLL
HANDLE hndlFile; // Handle for IcmpCreateFile()
LPHOSTENT pHost; // Pointer to host entry structure
struct in_addr iaDest; // Internet address structure
DWORD *dwAddress; // IP Address
IPINFO ipInfo; // IP Options structure
int nRet; // General use return code
DWORD dwRet; // DWORD return code
int x;
packetsize = atoi(dest[2]);
count = atoi(dest[5]);
timeout = atoi(dest[4]);
// Dynamically load the ICMP.DLL
hndlIcmp = LoadLibrary("ICMP.DLL");
if (hndlIcmp == NULL)
{
fprintf(stderr,"nCould not load ICMP.DLLn");
return;
}
// Retrieve ICMP function pointers
pIcmpCreateFile = (HANDLE (WINAPI *)(void))
GetProcAddress(hndlIcmp,"IcmpCreateFile");
pIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
GetProcAddress(hndlIcmp,"IcmpCloseHandle");
pIcmpSendEcho = (DWORD (WINAPI *)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD))
GetProcAddress(hndlIcmp,"IcmpSendEcho");
// Check all the function pointers
if (pIcmpCreateFile == NULL ||
pIcmpCloseHandle == NULL ||
pIcmpSendEcho == NULL)
{
fprintf(stderr,"nError getting ICMP proc addressn");
FreeLibrary(hndlIcmp);
return;
}
// Init WinSock
nRet = WSAStartup(0x0101, &wsaData );
if (nRet)
{
fprintf(stderr,"nWSAStartup() error: %dn", nRet);
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Check WinSock version
if (0x0101 != wsaData.wVersion)
{
fprintf(stderr,"nWinSock version 1.1 not supportedn");
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Lookup destination
// Use inet_addr() to determine if we're dealing with a name
// or an address
iaDest.s_addr = inet_addr(dest[1]);
if (iaDest.s_addr == INADDR_NONE)
pHost = gethostbyname(dest[1]);
else
pHost = gethostbyaddr((const char *)&iaDest,
sizeof(struct in_addr), AF_INET);
if (pHost == NULL)
{
fprintf(stderr, "n%s not foundn", dest[1]);
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Tell the user what we're doing
/*printf("nPinging %s [%s]", pHost->h_name,
inet_ntoa((*(LPIN_ADDR)pHost->h_addr_list[0])));*/
// Copy the IP address
dwAddress = (DWORD *)(*pHost->h_addr_list);
// Get an ICMP echo request handle
hndlFile = pIcmpCreateFile();
// for (x = 0; x < 4; x++)
// Set some reasonable default values
ipInfo.Ttl =dest[3];
ipInfo.Tos = 0;
ipInfo.IPFlags = 0;
ipInfo.OptSize = 0;
ipInfo.Options = NULL;
//icmpEcho.ipInfo.Ttl = 256;
// Reqest an ICMP echo
dwRet = pIcmpSendEcho(
hndlFile, // Handle from IcmpCreateFile()
*dwAddress, // Destination IP address
packetsize, // Pointer to buffer to send
0, // Size of buffer in bytes
&ipInfo, // Request options
&icmpEcho, // Reply buffer
sizeof(struct tagICMPECHO),
timeout); // Time to wait in milliseconds
// Print the results
iaDest.s_addr = icmpEcho.Source;
/* printf("\n Reply from %s Time=%ldms TTL=%d",
inet_ntoa(iaDest),
icmpEcho.RTTime,
icmpEcho.ipInfo.Ttl);*/
sprintf(ping_Resp,"%s %d %ld %d",
inet_ntoa(iaDest),
packetsize,
icmpEcho.RTTime,
icmpEcho.ipInfo.Ttl);
if (icmpEcho.Status)
{
// printf("nError: icmpEcho.Status=%ld",
// icmpEcho.Status);
printf("\n Request timed out");
//break;
}
//printf("\n");
// Close the echo request file handle
pIcmpCloseHandle(hndlFile);
FreeLibrary(hndlIcmp);
WSACleanup();
return ping_Resp;
}
JNIEXPORT jstring JNICALL Java_com_dtt_traffic_ping_PINGMain_ping
(JNIEnv *env, jclass job, jobjectArray oarr)
{
jsize argc = (*env)->GetArrayLength(env, oarr);
/* Declare a char array for argv */
int i;
char const* argv[128];
for (i = 1; i < 6; i++)
{
/* obtain the current object from the object array */
jobject myObject = (*env)->GetObjectArrayElement(env, oarr, i-1);
/* Convert the object just obtained into a String */
const char *str = (*env)->GetStringUTFChars(env,myObject,0);
/* Build the argv array */
argv[i] = str;
}
data=(char *)malloc(sizeof(char) * 2048);
sprintf(data,"%s",pingFun(argv),"-10000");
// printf("Data %s ",data);
return ((*env)->NewStringUTF(env,data));
}
Step5:
Compiling the C implementation into a native library, creating ping.dll or libPINGMain.so
On Solaris or Linux, the following command builds a shared library called libPINGMain.so:
cc -G -I/java/include -I/java/include/solaris
PINGMain.c -o libPINGMain.so
On Win32, the following command builds a dynamic link library (DLL) ping.dll using the Microsoft Visual C++ compiler:
cl -Ic:\java\include -Ic:\java\include\win32
-MD -LD PINGMain.c -ping.dll
Step 6: Running the PINGMain.java
java PINGMain
If you get the following error put the dll file in the java path
java.lang.UnsatisfiedLinkError: no PINGMain in library path
at java.lang.Runtime.loadLibrary(Runtime.java)
at java.lang.System.loadLibrary(System.java)
at PINGMain .main(PINGMain.java)
goto Projectmenu--->properties--->Click Java Build Path ---> Libraries Tab—> Add External JARs
Example Program for JavaWithOracleConnection
Replace the bold values with your settings.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class TestOracleConnection {
public static void main(String[] args) {
try {
Connection con = null;
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(
"jdbc:oracle:thin:@ipaddressoforacleinstalledmachine:1521:databasename", "username",
"password");
Statement s = con.createStatement();
ResultSet rs = s.executeQuery("SELECT * from tablename");
while (rs.next()) {
System.out.println("Values------>" + rs.getString("columnname"));
}
s.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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