jumptag.java

一个不错的bbs论坛系统．对初学者很有帮助

package com.yhbbs.comm.tag;

import java.util.List;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.log4j.Logger;
import com.yhbbs.forum.itface.ForumJump;
import com.yhbbs.yhclass.biz.ClassBiz;
import com.yhbbs.yhclass.itface.ClassJump;

/**
 * <p>Title: 论坛跳转标签</p>
 * <p>Company: www.yyhweb.com</p>
 * <br><b>CopyRight: yyhweb[由由华网]</b>
 * @author stephen
 * @version YHBBS-2.0
 */
public class JumpTag extends TagSupport{
	
	private static final long serialVersionUID = 1L;
	private static Logger bbslog = Logger.getLogger(JumpTag.class.getName());
	
	public int doStartTag() throws JspException {
	    return 0;
	}
	public int doEndTag() throws JspException {
	   try {  
	    	 StringBuffer sb = new StringBuffer();
	    	 List allclass = ClassBiz.getJumpClassF();
	    	 // 变量定义
	    	 ClassJump jbbsclass = null;
             String jclassName = "";
             int jclassId = 0;
             List forums = null;
             ForumJump jforum = null;
             String jforumName = "";
    		 int jforumId = 0;
    		 int i = 0,j = 0;
	    	 sb.append("<table align=center cellSpacing=0 cellPadding=0 width=100%>");
	    	 sb.append("<form name=jump>");
	    	 sb.append("<tr><td align=right>");
	    	     sb.append("<select name=jumpcf onchange=menu()>");
                 sb.append("<option>跳转到···</option>");
                 sb.append("<option>----------</option>");
                 sb.append("<option value=index.htm>论坛首页</option>");
                 for(i=0;i<allclass.size();i++){
                	 jbbsclass = (ClassJump) allclass.get(i);
                	 jclassName = jbbsclass.getClassname();
                	 jclassId = jbbsclass.getId();
                	 sb.append("<option");
            		 sb.append(" value=Class.htm?cId=");
            		 sb.append(jclassId);
            		 sb.append(">＋");
            		 sb.append(jclassName);
            		 sb.append("</option>");
            		 
            		 forums = jbbsclass.getAllforum();
                	 for(j=0;j<forums.size();j++){
                		 jforum = (ForumJump) forums.get(j);
                		 jforumName = jforum.getFname();
                		 jforumId = jforum.getId();
                		 sb.append("<option");
                		 sb.append(" value=Forum.htm?cId=");
             			 sb.append(jclassId);
             			 sb.append("&fId=");
             			 sb.append(jforumId);
             			 sb.append(">");
                		 sb.append("&nbsp;├ 『");
                		 sb.append(jforumName);
                		 sb.append("』 </option>");
                	 }
                 }
                 sb.append("</select>");
	    	 sb.append("</td></tr>");
	    	 sb.append("</form>");
	    	 sb.append("</table>");
	    	 JspWriter out = pageContext.getOut();
	         out.println(sb);
	         sb = null;
	     }catch(Exception e){
	            bbslog.error("JumpTag tag's doEndTag error!");
	     }
	     return 6;
	 }
}