Single controller for Multiple Visualforce pages

In salesforce we generally go with one visualforce page and one custom controller. Here i have come up with a solution where you can use same controller class for multiple pages. Below are the details of it:

1. Create a generic controller which will idetify which will identify the page which is currently being accessed.

public virtual class GenericControllerClass {
private String pageName;

public String getPageName(String url)
    {
     pageName='';
     if(url.indexOf('/apex/') != -1)
     {
      if(url.indexOf('?') != -1 )
      {
        pageName=url.subString(url.indexOf('/apex/')+6,url.indexOf('?'));
      }
      else
      {
        pageName=url.subString(url.indexOf('/apex/')+6);
      }
     }
     return pageName;
    }
}

2. Now assume you have three visuaforcePages page1,page2,page3.
page1:
<apex:page controller="SingleControllerClass">
.......
<your code here>
.......
</apex:page>

page 2:

<apex:page controller="SingleControllerClass">
.......
<your code here>
.......
</apex:page>

page 3:

<apex:page controller="SingleControllerClass">
.......
<your code here>
.......
</apex:page>


3. Now create controller class "SingleControllerClass" for above pages:

public class SingleControllerClass extends GenericControllerClass
{
  ......
  your page variables
  ......

  public SingleControllerClass()
  {
   super();
   String pageName=getPageName(ApexPages.currentPage()..getUrl());
   if(pageName=="page1")
 {
  initPage1();
 }
 else ifpageName=="page2")
 {
  initPage2();
 }
 else if(pageName=="page3")
 {
  initPage3();
 }
  }
 
  private void initPage1()
  {
    ..................
 initialize your page1 variables here.
 .................
  }
  private void initPage2()
  {
    ..................
 initialize your page2 variables here.
 .................
  }
  private void initPage3()
  {
    ..................
 initialize your page3 variables here.
 .................
  }

}


Above mentioned three steps is a very simple process to implement. Using above solution you would be able to reuse your code efficiently and it also eliminates initialization of other page variables.