Tag Archives: java

Java provides the java.util.regex package for pattern matching with regular expressions. A regular expression is a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern. They can be used to search or edit or manipulate data. The java.util.regex package primarily consists of the following three ... Read More »

Simple way of doing Date conversion from String is by using java.text.SimpleDateFormat. Here’s an extract of relevance from the javadoc, listing all available format patterns: G Era designator Text AD y Year Year 1996; 96 M Month in year Month July; Jul; 07 w Week in year Number 27 W Week in month Number 2 D Day in year Number ... Read More »

This tutorial redirects the System.out to a file provided by the user. Steps to follow – 1. Create a file myconsole.txt.2. Create a PrintStream that uses FileOutputStream3. Set the System Out with PrintStream object. Read More »

DWR is Open Source, available under the Apache Software License v2. DWR is a Java library that enables Java on the server and JavaScript in a browser to interact and call each other as simply as possible. DWR will generate the JavaScript to allow web browsers to securely call into Java code almost as if it was running locally. It ... Read More »

Download mod_jk (mod_jk.so is a Tomcat connector.) Download HTTP Apache server. And below I am describing the ways to configure mod_jk, HTTP Apache and Tomcat/Jboss AS 1). After downloading mod_jk rename this file as mod_jk.so 2). Place this file in the installed directory of apache in the below specified path – 3). Create the below mentioned files in the conf ... Read More »

What is Reverse DNS Lookup Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet. Computer networks use the Domain Name System to determine the IP address associated with a domain name. This process is also known as ... Read More »

In Java, you can execute external OS/shell commands. There are two ways to start an operating system process/execute shell command within Java: java.lang.Runtime#exec(java.lang.String), since Java 1 java.lang.ProcessBuilder, since Java 5 We will here show you both ways to execute Operating System/ Shell Commands 1. Using java.lang.Runtime The java.lang.Runtime class allows the application to interface with the environment in which the ... Read More »

This java based tutorial is designed to provide a basic overview of how to use HttpClient. Downloaded HttpClient and dependencies listed below that are required to put them on your classpath. httpclient-4.2.3.jar from http://hc.apache.org/downloads.cgi/li> commons-codec.jar from http://commons.apache.org/codec/ commons-logging.jar from http://commons.apache.org/logging/ junit.jar from http://www.junit.org/ The general process for using HttpClient consists of a number of steps: Create an instance of HttpClient. ... Read More »

How to set fake user agent What is user agent? User agent is software agent that is acting on behalf of a user. For example, an email reader is a mail user agent, and in the Session Initiation Protocol (SIP), the term user agent refers to both end points of a communications session. User agent acts as a client in ... Read More »

How to avoid Memory leak issue in Java What is Memory Leak? Memory leak mainly occurs when a program does not release the memory it has obtained for temporary use, it is the condition where the available computer memory reduces gradually there by resulting in poor performance. How to determine if Memory Leak exists in a Java application?If the application ... Read More »