Tutorials : Managing Data with the ThreadLocal Class :

A Servlet Example

. . .
<filter>
  <filter-name>TestFilter</filter-name>
  <filter-class>hansen.playground.TestFilter</filter-class>
</filter>

<filter-mapping>
  <filter-name>TestFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping> 
. . .

A case that immediately springs to mind is when you're using a logging system. When something is logged, it's done through the parameters to the log methods. But when you're using a ThreadLocal object, the logging system may fetch its local thread data with a simple call like the one below:

list = MyThreadLocal.get();

Coding with ThreadLocals

First of all, in this example, the object stored in ThreadLocal is a list containing pairs of strings: a name part and value part. The data in the list can be written out in a format like this:

name1=value1
name2=value2
. . .

To make using ThreadLocal object easier, wrap it in your own object (Listing 2).

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