Simple Android Client-Server Application

This is an android application which sends a text message to a server. When you press the send button, the application sends the message in the text field to the server program. Here the program been written so that the client runs on the Android emulator and the server runs on the local host. IP address 10.0.2.2  can be used to connect to the local host with Android. Server program is continuously listening to the port 4444. When an incoming message arrived, server read it and show it on the standard output.
This tutorial is based on Android 4.4 (API Level 19 - KITKAT) version.

Following are the source codes of main components.

Android Text Client Application

Java Sever Program

Following are the both Android client and Java server complete projects. You can clone or download them as zips from Git-Hub.

Git-Hub HTTPS clone URL: https://github.com/lakjcomspace/AndroidTextClientServer.git
Git-Hub Repository URL: https://github.com/lakjcomspace/AndroidTextClientServer
Download as a Zip: https://github.com/lakjcomspace/AndroidTextClientServer/archive/master.zip
You can run the projects by importing them to the IDE. Or just create you own project and copy and paste above source files.

Start-Up, Shutdown or Restart the Tomcat Server Using an Ant build.xml

Following Ant build script can be used to start, stop or restart your Tomcat server. First you should set the property "tomcat.home" to your Tomcat home directory. Then when you just execute the "ant" command, it will restart your running server.
Here are all the commands you can use with this script.

Start Up:    "ant tomcat-start"
Shutdown:  "ant tomcat-stop"
Restart:      "ant" or "ant tomcat-restart"

Depending on the web application you are running, you may be getting an Out of Memory PermGen space error. If so, remove the comment marks and enable jvm argument <jvmarg value="-XX:MaxPermSize=256m"/> in the script (line 16).

Erase Some Characters from Each Line of a Text File - Java Program

Following Java program erase user given fixed number of characters from each line of a text file. Here the number of characters to be erased is 3. For the convenience input and output files are given as two separate file.  Output file may contain the result you want.