package com.foxinmy.weixin4j.xml;
   
   import java.io.ByteArrayInputStream;
   import java.io.IOException;
   
   import org.xml.sax.Attributes;
   import org.xml.sax.InputSource;
   import org.xml.sax.SAXException;
   import org.xml.sax.XMLReader;
  import org.xml.sax.helpers.DefaultHandler;
  import org.xml.sax.helpers.XMLReaderFactory;
  
  import com.foxinmy.weixin4j.util.ServerToolkits;
  
  /**
   * 获取加密的密文内容
   * 
   * @className EncryptMessageHandler
   * @author jinyu(foxinmy@gmail.com)
   * @date 2015年5月17日
   * @since JDK 1.6
   * @see
   */
  public class EncryptMessageHandler extends DefaultHandler {
  
  	private String toUserName;
  	private String encryptContent;
  	private String content;
  
  	@Override
  	public void startDocument() throws SAXException {
  		toUserName = null;
  		encryptContent = null;
  	}
  
  	@Override
  	public void startElement(String uri, String localName, String qName,
  			Attributes attributes) throws SAXException {
  
  	}
  
  	@Override
  	public void endElement(String uri, String localName, String qName)
  			throws SAXException {
  		if (localName.equalsIgnoreCase("encrypt")) {
  			encryptContent = content;
  		} else if (localName.equalsIgnoreCase("tousername")) {
  			toUserName = content;
  		}
  	}
  
  	@Override
  	public void characters(char[] ch, int start, int length)
  			throws SAXException {
  		this.content = new String(ch, start, length);
  	}
  
  	public String getToUserName() {
  		return toUserName;
  	}
  
  	public String getEncryptContent() {
  		return encryptContent;
  	}
  
  	private final static EncryptMessageHandler global = new EncryptMessageHandler();
  
  	public static EncryptMessageHandler parser(String xmlContent)
  			throws RuntimeException {
  		try {
  			XMLReader xmlReader = XMLReaderFactory.createXMLReader();
  			xmlReader.setContentHandler(global);
  			xmlReader.parse(new InputSource(new ByteArrayInputStream(xmlContent
  					.getBytes(ServerToolkits.UTF_8))));
  		} catch (IOException e) {
  			throw new RuntimeException(e);
  		} catch (SAXException e) {
  			throw new RuntimeException(e);
  		}
  		return global;
  	}
  }