Super awesome Java form POST command line program



/*

This posts data to myserver to a Struts action, sending form data which then
gets transmitted to the crystal reports server. If the connection to the
crystal server can't be made, an error is displayed, and email(s) are sent.

Sample run:

[lupsha@myserver ~]$ /opt/SDK/jdk/bin/javac SimplePoster.java
[lupsha@myserver ~]$ /opt/SDK/jdk/bin/java SimplePoster
OK: Crystal server is UP
[lupsha@myserver ~]$




*/

import java.net.URLConnection;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.lang.Runtime;


public class SimplePoster
{

public SimplePoster()
{
try {

String postUrlStr = "http://MyServer/MyApp/mystrutsaction.do";

URL url = null;
url = new URL( postUrlStr );


URLConnection urlConnection = url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; InfoPath.2)");
urlConnection.setRequestProperty("Referer", "http://www.google.com" );
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");


String myForm = "showCriteria=Yes&rawData=Yes&methodID=*&status=*&action=Submit";
urlConnection.setRequestProperty("Content-Length", myForm.length() + "");


OutputStream os = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os));

writer.write(myForm);
writer.flush();
writer.close();


InputStream ins = urlConnection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(ins));
String str = "";
StringBuffer returnStringBuffer = new StringBuffer("");
while((str = reader.readLine()) != null)
{
returnStringBuffer.append(str);
}

// System.out.println( returnStringBuffer.toString() );
if( returnStringBuffer.indexOf( "CrystalCompositeViewState" ) != -1 )
System.out.println("OK: Crystal server is UP");
else
{
System.out.println("BAD: Crystal server is DOWN!");
String command = "";
command += "/bin/echo \"Crystal server is down\"";
command += " | mail -s \"Crystal Server Down\" alan.lupsha@my.awesome.domain";
Runtime.getRuntime().exec(command);
}


} catch( Exception e )
{
System.out.println("Exception: " + e.toString() );
}


}



public static void main(String args[])
{
SimplePoster simplePoster = new SimplePoster();
}


}


How to send email from the Linux shell

/bin/echo "My custom message" | mail -s "My custom topic" alan.lupsha@my.email.address

Stock market prediction formula

Market prediction M(H,S,t) is the extrapolation of data, in market M, given a history H on the delta(S,N), where S is the symbol being watched, and N is the set of neighbor symbols, observed over time t.

How to import a new project into CVS

cvs import -m 'Alan new project import' project-directory vendor START

How to invoke maven to perform a jar library install

Invoke this installjar with:
sudo -u maven /home/maven/installjar $1 $2 $3 $4
Don't forget to add your user to the sudoers file.

> cat installjar
#!/bin/sh

# ==========================================
# by Alan Lupsha, 02/04/2009
# Installs a jar into the Maven2 repository
# ==========================================

GROUP=$1
ARTIFACT=$2
VERSION=$3
JARPATH=$4

MAVEN_DIR=/home/maven
export JAVA_HOME=/opt/SDK/jdk

checkUserArgs()
{
    if [ "$GROUP" = "" ] ; then
        syntax
    fi
    if [ "$ARTIFACT" = "" ] ; then
        syntax
    fi
    if [ "$VERSION" = "" ] ; then
        syntax
    fi
    if [ "$JARPATH" = "" ] ; then
        syntax
    fi

    if [ -s "$JARPATH" ] ; then
        echo "[ALAN] OK: file exists: $JARPATH"
    else
        echo "[ALAN] Error: file does not exist: $JARPATH"
        echo "[ALAN] Make sure to upload the file there first, before executing the script"
        RETURN_CODE=1
        exit $RETURN_CODE
    fi
}

syntax()
{
    echo "[ALAN]   ERROR: Please use the following syntax:   ./installjar group artifact version path"
    echo "[ALAN] "
    echo "[ALAN]   EXAMPLE:  "
    echo "[ALAN]   To install jar file called servlet1.3.jar from your local directory, by placing it "
    echo "[ALAN]   in group basej2ee with the name servlet and version 1.3, do the following: "
    echo "[ALAN]   1. FTP your jar into your directory, example: /home/smith_j/servlet1.3.jar"
    echo "[ALAN]   2. Execute:   ./installjar basej2ee servlet 1.3 ~/servlet1.3.jar "
    echo "[ALAN] "
    echo "[ALAN]   3. In your project's pom.xml file add the following dependency: "
    echo "[ALAN]    <dependency>"
    echo "[ALAN]       <groupId>basej2ee</groupId>"
    echo "[ALAN]       <artifactId>servlet</artifactId>"
    echo "[ALAN]       <version>1.3</version>"
    echo "[ALAN]    </dependency>"
    echo "[ALAN] "
    echo "[ALAN]   Good luck."
    RETURN_CODE=1
    exit $RETURN_CODE
}

installFile()
{
    /bin/mkdir $MAVEN_DIR/projects/
    cd $MAVEN_DIR/projects/

    COMMAND="/maven/maven-2.0.6/bin/mvn install:install-file -DgroupId=$GROUP -DartifactId=$ARTIFACT -Dversion=$VERSION -Dpackaging=jar -Dfile=$JARPATH"
    echo "[ALAN]   Executing command: "
    echo "[ALAN]   $COMMAND"

    /maven/maven-2.0.6/bin/mvn install:install-file -DgroupId=$GROUP -DartifactId=$ARTIFACT -Dversion=$VERSION -Dpackaging=jar -Dfile=$JARPATH

    echo "[ALAN] "
    echo "[ALAN] Don't forget to add the following dependency in your project's pom.xml file:"
    echo "    <dependency>"
    echo "       <groupId>$GROUP</groupId>"
    echo "       <artifactId>$ARTIFACT</artifactId>"
    echo "       <version>$VERSION</version>"
    echo "    </dependency>"
    echo "[ALAN] "
    echo "[ALAN] If the install was successful, then you can remove your jar file from: $JARPATH "
}


checkUserArgs
installFile
echo "[ALAN] Finished! (questions, comments, concerns - email "

mySQL versus Oracle data types

Shell script to use Maven2 to build jar libraries

Invoke this bldjar with:
sudo -u maven /home/maven/bldjar $1 $2 $3 $4
Don't forget to add your user to the sudoers file.

> cat bldjar

#!/bin/sh
# ===================================================================
# This script builds a maven2 jar project, commits the new jar to CVS
# and optionally registers the new jar as a reusable library in maven.
# Alan Lupsha
# ====================================================================

# environment variables
export JAVA_HOME=/opt/SDK/jdk
export CVSROOT=/maven/cvsroot

PROJECT=$1
REGISTER_JAR=$2
GROUP=$3
ARTIFACT=$4
MAVEN_DIR=/home/maven
LAST_UPDATE="2009.02.04"
OK_TO_REGISTER_JAR="no"

check_user_arguments()
{
  if [ "$PROJECT" = "" ] ; then
     echo "[ALAN] You must pass the project name as an argument! ex: sudo -u maven /home/maven/bldjar my-abc"
     PROJECT="noProjectSpecified"
     RETURN_CODE=1
     OK_TO_REGISTER_JAR="no"
     exit $RETURN_CODE
  fi

  if [ "$REGISTER_JAR" = "registerjar" ] ; then
     if [ "$GROUP" = "" ] ; then
        echo "[ALAN] Error: invalid group. You asked to register the jar in group ->$GROUP<-"
        echo "[ALAN] Syntax: bldjar registerjar GROUP ARTIFACT"
        RETURN_CODE=1
        OK_TO_REGISTER_JAR="no"
        exit $RETURN_CODE
     else
        echo "[ALAN] Registering jar: group is ok: $GROUP"
     fi
     if [ "$ARTIFACT" = "" ] ; then
        echo "[ALAN] Error: invalid artifact. You asked to register the jar using artifact ->$ARTIFACT<-"
        echo "[ALAN] Syntax: bldjar registerjar GROUP ARTIFACT"
        RETURN_CODE=1
        OK_TO_REGISTER_JAR="no"
        exit $RETURN_CODE
     else
        echo "[ALAN] Registering jar: artifact is ok: $ARTIFACT"
        OK_TO_REGISTER_JAR="yes"
     fi
  else
     REGISTER_JAR="dontregisterjar"
  fi
  echo "[ALAN] Your saved arguments are: $PROJECT $REGISTER_JAR $GROUP $ARTIFACT"
}


set_up_directories()
{
  # set up the directories, copy source
  cd $MAVEN_DIR
  mkdir $MAVEN_DIR/projects/
  cd $MAVEN_DIR/projects
  cvs checkout $PROJECT
  cd $MAVEN_DIR/projects/$PROJECT/
  mkdir TEMP
  mv src/* TEMP/
  mkdir src/main/
  mkdir src/main/java
  mv TEMP/* src/main/java
}


perform_build()
{
  # perform the build
  /maven/maven-2.0.6/bin/mvn --offline clean package > $MAVEN_DIR/projects/$PROJECT/build.log
  cat $MAVEN_DIR/projects/$PROJECT/build.log
  cvs add -m 'your build log' build.log
  cvs commit -m 'your build log' build.log
}


commit_the_jar()
{
  # go into the target dir, there may or may NOT be something in there
  mkdir $MAVEN_DIR/projects/$PROJECT/target/
  cd $MAVEN_DIR/projects/$PROJECT/target/
  JAR_NAME=`ls *.jar`
  echo "[ALAN] Your jar file name is $JAR_NAME"

  # just in case this doesn't exist
  mkdir $MAVEN_DIR/projects/$PROJECT/dist/

  # if the jar already existed, commit it
  if [ -f "$MAVEN_DIR/projects/$PROJECT/dist/$JAR_NAME" ] ; then
     rm $MAVEN_DIR/projects/$PROJECT/dist/$JAR_NAME
     cp $MAVEN_DIR/projects/$PROJECT/target/$JAR_NAME $MAVEN_DIR/projects/$PROJECT/dist/
     cd $MAVEN_DIR/projects/$PROJECT/dist/
     cvs commit -m 'newly built' $JAR_NAME

  # if the jar is brand new, add it to CVS and commit it
  else
     echo "[ALAN] Adding new file to CVS - first time ever"
     cp $MAVEN_DIR/projects/$PROJECT/target/$JAR_NAME $MAVEN_DIR/projects/$PROJECT/dist/

     cd $MAVEN_DIR/projects/$PROJECT/dist/
     cvs add -m 'newly added' $JAR_NAME
     cvs commit -m 'newly-added now committed by bldjar script' $JAR_NAME
  fi
}

perform_cleanup()
{
  # clean up
  echo "[ALAN] Now cleaning up, removing $MAVEN_DIR/projects/$PROJECT/"
  rm -Rf $MAVEN_DIR/projects/$PROJECT/

  echo "[ALAN] Script version was last updated on: $LAST_UPDATE"
  echo "[ALAN] Any questions, comments, concerns? Email me at: "
}

register_jar_as_library()
{
  # check if we need to register the jar
  if [ "$OK_TO_REGISTER_JAR" = "yes" ] ; then
     echo "[ALAN] Now registering your jar as a dependency in the maven lib directory structure..."
     extract_rvl_from_jar_name
     /maven/maven-2.0.6/bin/mvn install:install-file  -DgroupId=$GROUP -DartifactId=$ARTIFACT -Dversion=$RVL -Dpackaging=jar -Dfile=$MAVEN_DIR/projects/$PROJECT/dist/$JAR_NAME
     echo "[ALAN] If the above registration was successful, don't forget to add this to your pom.xml:"
     echo "    <dependency>"
     echo "       <groupId>$GROUP</groupId>"
     echo "       <artifactId>$ARTIFACT</artifactId>"
     echo "       <version>$RVL</version>"
     echo "    </dependency>"
     echo " "
  else
     echo "[ALAN] I'm not registering your jar as a library. Syntax for that is: ./bldjar YOUR-PROJECT registerjar GROUP ARTIFACT"
  fi
}


extract_rvl_from_jar_name()
{
  STR=$JAR_NAME
  len=${#STR}
  REV=""
  for (( i=$len ; i>0 ; i-- ))
  do
          REV=$REV""${STR:$i-1:$i}
          STR=${STR%${STR:$i-1:$i}}
  done
  #echo "Reversed string $REV"
  #ex: raj.3.2.1-reganamytiruces-ped

  NAME=`echo $REV | cut -f1 -d'-'`
  #echo "$NAME"
  #ex: raj.3.2.1

  STR=$NAME
  len=${#STR}
  REV=""
  for (( i=$len ; i>0 ; i-- ))
  do
        REV=$REV""${STR:$i-1:$i}
        STR=${STR%${STR:$i-1:$i}}
  done
  #echo "Reversed string $REV"
  #ex: 1.2.3.jar

  FULLLEN=${#REV}
  ENDPOS=FULLLEN-4
  RVL=${REV:0:ENDPOS}
}


check_user_arguments
set_up_directories
perform_build
commit_the_jar
register_jar_as_library
perform_cleanup

Don't accept gifts

Harassment online course