resultcolumntag.java

招标投标网上系统

package cn.com.syntc.common.taglib;

import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

import cn.com.syntc.common.type.ResultSet;

public class ResultColumnTag extends TagSupport {
    // DEBUG FLAG
    private final static boolean DEBUG = false;

    private String column = "";

    private ResultSet resultset = null;

    public void setColumn(String column) {
        this.column = column;
    }

    public int doStartTag() {
        try{
          ResultHeaderTag resultHeaderTag = (ResultHeaderTag)this.findAncestorWithClass(this, Class.forName("cn.com.syntc.common.taglib.ResultHeaderTag"));
          if (resultHeaderTag != null) {
              resultset = resultHeaderTag.resultset;
          }
        }
        catch(Exception ex){
          System.out.println("error:"+ex.getMessage());
        }
        return  SKIP_BODY;
    }

    public int doEndTag () {
        try {
          if (column != null) {
             String columnName = column;
             if(columnName.toUpperCase().equals("ROWID"))
             {
               pageContext.getOut().print(resultset.currentWatchRowNumber);  
             }
             else
             {
               String columnValue = resultset.getString(column);
               if(DEBUG){
                System.out.println("字段名：" + columnName + "  字段值：" + columnValue);
               }
               pageContext.getOut().print(columnValue);
             }
          }
        } catch (Exception ex) {
          System.out.println("error:"+ex.getMessage());
        }
        return  EVAL_PAGE;
    }
}