requesthandler.java

java的一系列产品中包括jsme,jmse,j2ee,本文件提供j2ee实现的源代码.

package sax;

import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

/**
 * This class extends <tt>HandlerBase</tt> and is used to handle events 
 * created as an XML document is parsed by a SAX compliant 
 * parser.
 *
 * @author Copyright (c) 2002 by BEA Systems, Inc. All Rights Reserved.  
 */

public class RequestHandler extends DefaultHandler {

  /** Default constructor. */
  public RequestHandler() {}
  
  //==========================================================================
  // DocumentHandler methods
  //==========================================================================

  // Amount to indent 
  private int indentLevel = 0; 

  /** 
   * Receives notification of the beginning of the XML document. 
   * Starts printing information to the shell from which you started the
   * WebLogic server.
   *
   * @exception SAXException If an error occurred starting to parse the XML doc
   */
  public void startDocument() throws SAXException {
    System.out.println("\nSTART DOCUMENT\n");
    System.out.println("<?xml version='1.0' encoding='UTF-8'?>");
  } 
   
  /** 
   * Receives notification of the end of the XML document.  Prints a
   * final message to the shell from which you started the WebLogic server.
   *
   * @exception SAXException If an error occurred while parsing the XML doc
   */
  public void endDocument() throws SAXException {    
    try {
      System.out.println("\nEND DOCUMENT");      
    } catch (Exception e) {
      throw new SAXException ("I/O error", e);
    }
  }

  /** 
   * Receives notification of the start of an element.   Prints out the
   * name and value of the element, properly indented, to the shell from
   * which you started the WebLogic server.
   * 
   * @param name   the string name of the element
   * @param attrs  the list of attributes of the element
   * @exception    SAXException if an error occurred while parsing the XML doc
   */
  public void startElement(String name, Attributes attrs) throws SAXException {
    System.out.println("in startElement()");
    //indentLevel++;
    System.out.println("ELEMENT: " +name);
    if (attrs != null) {
			for (int i = 0; i < attrs.getLength (); i++) {
				System.out.println("   ATTR: " +attrs.getLocalName(i) + " = " + attrs.getValue(i));
      }
    }
    System.out.println("end startElement()");
   }

   /** 
    * Receives notification of the end of an element.   Prints 
    * notice to the shell from which you started the WebLogic server.
    *
    * @param name the string name of the element
    * @exception SAXException If an error occurred while parsing the XML doc
    */
   public void endElement(String name) throws SAXException {
     System.out.println ("END_ELM: " + name);
     //indentLevel--;
   }

  /**
   * Receives notification of character data inside an element. Prints out 
   * characters to the shell from which you started the WebLogic server.
   * 
   * @param buf     array of characters 
   * @param offset  the start position in the character array
   * @param len     the number of characters to use from the array
   * @exception     SAXException if an error occurred while parsing the XML doc
   */
   public void characters (char buf [], int offset, int len) throws SAXException {
     //nl();
     String s = new String(buf, offset, len);
       if (!s.trim().equals("")) System.out.println ("CHARS:   " + s);
   }

   //=============================================================
   // ErrorHandler methods
   //=============================================================
   
   /**
    * Receives notification of a recoverable parser error.  
    *
    * @param x   the parser exception that occurred
    * @exception SAXException if an error occurred while receiving the original error
    */
   public void error (SAXParseException x) throws SAXException { 
     throw x; 
   }
}