welcome2taghandler.java

高级java2 大学教程(含源码,经典的Java学习教程

// Fig. 10.34: Welcome2TagHandler.java 
// Custom tag handler that handles a simple tag.
package com.deitel.advjhtp1.jsp.taglibrary;

// Java core packages
import java.io.*;

// Java extension packages
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class Welcome2TagHandler extends TagSupport {
   private String firstName = "";
 
   // Method called to begin tag processing
   public int doStartTag() throws JspException
   {
      // attempt tag processing
      try {
         // obtain JspWriter to output content
         JspWriter out = pageContext.getOut();

         // output content
         out.print( "Hello " + firstName +
            ", <br />Welcome to JSP Tag Libraries!" );
      }
      
      // rethrow IOException to JSP container as JspException
      catch( IOException ioException ) {
         throw new JspException( ioException.getMessage() );
      }
      
      return SKIP_BODY;  // ignore the tag's body
   }
   
   // set firstName attribute to the users first name
   public void setFirstName( String username )
   {
      firstName = username;
   }
}

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