writexml.java

EOS的一个很好的例子.包括页面构件、展现构件

/** EOS Tag Java File **/
package com.primeton.eos.fbframe.tag;

import org.w3c.dom.*;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspException;

import com.primeton.tp.web.driver.webdriver.WebDriver;
import com.primeton.eos.webtag.util.ResponseUtils;
import com.primeton.tp.core.prservice.context.*;
import com.primeton.tp.common.logger.Logger;
import com.primeton.tp.common.xml.XmlUtil;

public class WriteXml extends TagSupport {
	private String property;
	private String id;
	private String scope;
	
	public WriteXml() {
		property = null;
		id = null;
		scope = "request";
	}

	public String getProperty() {
		return property;
	}
	public void setProperty(String value) {
		this.property = value;
	}
	public String getId() {
		return id;
	}
	public void setId(String value) {
		this.id = value;
	}
	public String getScope()
	{
		return scope;
	}

	public void setScope(String s)
	{
		scope = s;
	}
	public int doStartTag() throws JspException {
		//TODO Add your code here. 
		Node n = null;
		if (scope.equals("request")) {
			if (id == null)
				id = WebDriver.REQUEST_REQUEST_CONTEXT;
			RequestContext requestcontext = (RequestContext)pageContext.getAttribute(id);
			if (requestcontext == null)
				requestcontext = (RequestContext)pageContext.getRequest().getAttribute(id);
			if (requestcontext != null) {
				try
				{
					n = requestcontext.getEntity(property);
				}
				catch (Exception exception)
				{
					Logger.error(this, "WriteXmlTag :: getProperty{" + property + "} error");
					n = null;
				}
			}
		} else if (scope.equals("session")) {
			if (id == null)
				id = "sessionContext";
			SessionContext sessioncontext = (SessionContext)pageContext.getSession().getAttribute(id);
			if (sessioncontext != null) {
				try
				{
					n = sessioncontext.getEntity(property);
				}
				catch (Exception exception1)
				{
					Logger.error(this, "WriteXmlTag :: getProperty{" + property + "} error");
					n = null;
				}
			}
		} else {
			Logger.error(this, "WriteXmlTag :: scope{" + scope + "} not exist");
		}
		if (n == null || n.getNodeType()== Node.ATTRIBUTE_NODE)
			ResponseUtils.write(pageContext, "");
		else {
			String s = XmlUtil.node2String(n);
			if (s.startsWith("<?xml")) {
				int p = s.indexOf("?>");
				if (p > 0) {
					p += 2;
					for (;p<s.length(); p++) {
						if (s.charAt(p) == '<')
							break;
					}
					ResponseUtils.write(pageContext, s.substring(p));
					return 0;
				}
			}
			ResponseUtils.write(pageContext, s);
		}
		return 0;
	}

	public int doEndTag() throws JspException {
		//TODO Add your code here. 
		return super.doEndTag();
	}

	public void release() {
		property = null;
		id = WebDriver.REQUEST_REQUEST_CONTEXT;
	}

}