navbartag.java

云网论坛CWBBS 源码,内容丰富,学习,参考,教学的好资料,具体见内说明,

package cn.js.fan.module.nav;

import javax.servlet.jsp.tagext.*;
import org.apache.log4j.Logger;
import java.util.Iterator;

public class NavBarTag extends TagSupport {
    Iterator ir = null;
    String query, db;
    Logger logger = Logger.getLogger(NavBarTag.class.getName());

    public NavBarTag() {
    }

    /**
     * put your documentation comment here
     * @return
     */
    public int doStartTag() {
        getAllNav();
        return EVAL_BODY_INCLUDE;
    }

    /**
     * put your documentation comment here
     * @return
     */
    public int doAfterBody() {
        try {
            if (ir==null || !ir.hasNext()) {
                return SKIP_BODY; // 输出完毕则继续往下执行
            } else {
                return EVAL_BODY_AGAIN; //还有未输出，重新对其body content计值
            }
        }

        catch (Exception e) {
            logger.error(e.getMessage());
        }
        return SKIP_BODY;
    }


    /**
     * put your documentation comment here
     * @return
     */
    public int doEndTag() {
        return EVAL_PAGE;
    }

    public void getAllNav() {
        NavigationMgr nmr = new NavigationMgr();
        ir = nmr.getAllNav();
    }

}