该taglib解决了jsp fmt:formatNumber 四舍五入 奇入偶不入的问题

1先写一个tld

    
        
     
      1.0
         
     
      1.2
         
     
      holyant
         
     
      http://www.holyant.com/jsp
         
             
      
       NormalRound
              
      
       com.junf.bbd.common.taglibs.HolyantTag
              
                  
       
        value
                   
       
        true
               
              
                  
       
        scale
                   
       
        true
               
          
     
    

2.web.xml 配置

        
             
      
       http://www.holyant.com/jsp
              
      
       /WEB-INF/tlds/holyant.tld
          
     
    

3. 创建class HolyantTag

package com.junf.bbd.common.taglibs;import org.apache.taglibs.standard.tag.el.fmt.FormatNumberTag;import javax.servlet.jsp.JspException;import java.math.BigDecimal;public class HolyantTag extends FormatNumberTag {    private static final long serialVersionUID = 1L;    private int scale;    @Override    public int doEndTag() throws JspException {        BigDecimal v = new BigDecimal(value.toString());        try {            pageContext.getOut().print(v.setScale(scale, BigDecimal.ROUND_HALF_UP).toString());        } catch (Exception e) {            throw new JspException(e.getMessage());        }        return EVAL_PAGE;    }    public int getScale() {        return scale;    }    public void setScale(int scale) {        this.scale = scale;    }}

4. jsp中使用

<%@taglib prefix="holyant" uri="http://www.holyant.com/jsp"%>