Java property file usage

Use the below code to read the java property file and retrieve the property value.
 
      Properties properties = new Properties();
        FileInputStream in;
        try {
            in = new FileInputStream("app.properties");
            properties.load(in);
            in.close();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return properties.getProperty("appcode");

Sample "app.properties" file is shown below.

appcode=50
email=admin@yahoo.com

From date < To date validate using js

Use the below js code to validate date "From date < To date"

         var frmDate = document.getElementById("frmDate").value;
         var toDate = document.getElementById("toDate").value;

         if (frmDate < toDate) {
               alert("Invalid Date Range!\nStart Date cannot be after End Date!")
               return false;
           }

Solution to dwr session error

Edit your web.xml file and and the following code.

<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>

Move large number of files in solaris using "awk"

• Change directory where your files are located.
• Use the following "awk" script to move files from one location to another.

  for k in `ls | awk '{print $1}'`; 
  do 
  mv $k destination;
  done

Use java 64 bit version

You have to use 64bit version of java when your memory allocation is larger than 4Gb.

Use -d64 parameter when running the application.

java -d64 -jar -Xms1024m -Xmx4096m Test.jar

Type Cast in Java Script

In js, variables are created as var type. That means, js engine can cast it to the original type by itself.

parseInt(12) will be converted 12 to an Integer value.

           Example                           Result 
parseInt("12")                          12
parseInt("12.657")                    12
parseInt("12aaaa")                   12
parseInt("aaaa")                NaN (means "Not a Number")

Encrypt, Decrypt password in Mysql

Inserting password encrypted to database using the following sql.

INSERT INTO PASSWORD(pass) VALUES(DES_ENCRYPT('user password')); 

This SQL will encrypt the user inserted password to a encrypted text. In table level, password is unreadable.

Instead of DES_ENCRYPT() method you can come up with your own function.

Selecting password from database to a string.

SELECT DES_DECRYPT(pass) FROM PASSWORD ;

This SQL will return user password as user inserted.