JDK help documentation in eclipse

When I first started using eclipse, I don't know how to use JDK help documentation in eclipse and how to set

I finally got it done in the past few days. Now, Let's sum up,
　　
Hope to help you.

I am afraid it is the simplest plug-in:

 

1. Create a directory: bdsc.java.doc

2 plugin. xml:

<?xml  version="1.0"  encoding="UTF-8"?>  
<plugin    id="bdsc.java.doc"  
     name="bdsc.java.doc"  
     version="0.0.1"  
     provider-name="bdsc">  

     <extension  point="org.eclipse.help.toc">  
           <toc  file="toc.xml"  primary="true"/>  
     </extension>  

</plugin>  

3 toc. xml: (you need to change the Java Doc path)

<?xml  version="1.0"  encoding="UTF-8"?>  
<?NLS  TYPE="org.eclipse.help.toc"?>  

<toc  label="java  doc"  topic="index.Html">  
               <topic  label="index.html"  href="file:/C:/j2sdk1.4.2_docs/api/index.html"  />  
</toc>  

4. Copy the directory to eclipse's plugins.

5. Use help => help Contents

Successful!