resultcolumnnotequaltag.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 ResultColumnNotEqualTag extends TagSupport {
    // DEBUG FLAG
    private final static boolean DEBUG = false;

    private String column = "";
    private String value = "";

    private ResultSet resultset = null;

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

    public void setValue(String value) {
        if(value==null)
          this.value = "";
        else
          this.value = value;
    }

    public int doStartTag() {
      int returnType = SKIP_PAGE;
        try{
          ResultHeaderTag resultHeaderTag = (ResultHeaderTag)this.findAncestorWithClass(this, Class.forName("cn.com.syntc.common.taglib.ResultHeaderTag"));
          if (resultHeaderTag != null) {
              resultset = resultHeaderTag.resultset;
          }
          if (column != null) {
             String columnName = column;

             String columnValue = resultset.getString(column);
             if(columnName.toUpperCase().equals("ROWID"))
             {
               if(this.value.equals("")) this.value="0";

               if(resultset.currentWatchRowNumber%2 != Integer.parseInt(this.value))
               {
                 returnType = EVAL_BODY_INCLUDE;
               }
               else
               {
                 returnType = SKIP_BODY;
               }
             }
             else
             {
               if(!columnValue.equals(this.value))
               {
                 returnType = EVAL_BODY_INCLUDE;
               }
               else
               {
                 returnType = SKIP_BODY;
               }
             }  
             if(DEBUG){
              System.out.println("字段名：" + columnName + "  字段值：" + columnValue + "  比较值：" + value);
             }
          }
        }
        catch(Exception ex){
          System.out.println("error:"+ex.getMessage());
        }

        return  returnType;
    }

    public int doEndTag () {
      return  EVAL_PAGE;
    }
}