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<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
	version="2.0">
	
	<description>JSTL_game_EXT_FUNCTION</description>
	<tlib-version>2.0</tlib-version>
	<short-name>xfn</short-name>
	<uri>http://www.game.com/gameFunction</uri>
	
	<!-- 替换序号为A/B/C/D/....  -->
	<function>
		<description>substring</description>
		<name>replaceOptions</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String replaceOptions(java.lang.Integer)</function-signature>
		<example>${xfn:replaceOptions(score)}</example>
	</function>
	
	<!-- 截取字符串的tag -->
	<function>
		<description>substring</description>
		<name>subStr</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String subStr(java.lang.String,int,int)</function-signature>
		<example>${xfn:subStr(str,start,end)}</example>
	</function>
	
	<function>
		<description>substring</description>
		<name>subStrs</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String subStrs(java.lang.String,int,int,int,int)</function-signature>
		<example>${xfn:subStrs(str,start,end,len,num)}</example>
	</function>
	
	<!-- 解析付费比率 -->
	<function>
		<description>substring</description>
		<name>analyticPay</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String analyticPay(int, int)</function-signature>
		<example>${xfn:analyticPay(chargeNum, regNum)}</example>
	</function>
	
	<!-- 转换字符串日期显示格式 -->
	<function>
		<description>substring</description>
		<name>dataStrToStr</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String dataStrToStr(java.lang.String, java.lang.String, java.lang.String)</function-signature>
		<example>${xfn:dataStrToStr(chargeNum, regNum)}</example>
	</function>
	
	<!-- 除法运算 -->
	<function>
		<description>division</description>
		<name>division</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String division(int, int)</function-signature>
		<example>${xfn:division(member, denominator)}</example>
	</function>
	
	<!-- 格式化金额 -->
	<function>
		<description>formatDoubleToMoney</description>
		<name>formatDoubleToMoney</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String formatDoubleToMoney(java.lang.Double)</function-signature>
		<example>${xfn:formatDoubleToMoney(money)}</example>
	</function>
	<function>
		<description>formatIntegerToMoney</description>
		<name>formatIntegerToMoney</name>
		<function-class>com.game.common.utils.gameFnTag</function-class>
		<function-signature>java.lang.String formatIntegerToMoney(java.lang.Integer)</function-signature>
		<example>${xfn:formatIntegerToMoney(money)}</example>
	</function>
</taglib>

数据字典：

<taglib xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
    version="2.1">
    
	<description>datadict core library</description>
	<display-name>datadict core</display-name>
    <tlib-version>1.0</tlib-version>
	<uri>http://www.game.com/datadict</uri>
	<tag>
		<name>select</name>
		<tag-class>com.game.common.utils.DataDictionarySupport</tag-class>
		<body-content>empty</body-content>
		<attribute>
			<name>id</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>name</name>
			<type>String</type>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>kindId</name>
			<type>Integer</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>depth</name>
			<type>Integer</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>pId</name>
			<type>Integer</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>style</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>className</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>defaultValue</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
		<attribute>
			<name>ltype</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
		<attribute>
			<name>ltype</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
		<attribute>
			<name>initId</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
			<attribute>
			<name>initValue</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
		<attribute>
			<name>hideValue</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
		<attribute>
			<name>setOptValueFlag</name>
			<type>String</type>
			<required>false</required>
			<rtexprvalue>false</rtexprvalue>
		</attribute>
	</tag>
	
</taglib>

Java funciton 代码

package com.exam.util;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.Date;

public class FnTag {

	
	
	/** 
	 * 截取字符串
	 * @param str	要截取的字符串
	 * @param start 起始位置(0开始,不包含)
	 * @param end	结束位置(包含)
	 * @return
	 */
	public static String subStr(String str, int start, int end) {
		if(null == str)
			return "";
		if (str.trim().length() > end) {
			return str.trim().substring(start, end);
		} else {
			return str.trim();
		}
	}

	/** 
	 * 截取字符串
	 * @param str	要截取的字符串
	 * @param start 起始位置(0开始,不包含)
	 * @param end	结束位置(包含)
	 * @param len	超过多少长度开始截取
	 * @param num 	显示多少个省略...
	 * @return
	 */
	public static String subStrs(String str, int start, int end, int len, int num) {
		StringBuilder strs = new StringBuilder();
		if(null == str)
			return "";
		if (str.trim().length() > len) {
			strs.append(str.trim().substring(start, end));
			while (num>0) {
				strs.append(".");
				num--;
			}
		} else {
			strs.append(str.trim());
		}
		return strs.toString();
	}
	
	
	/**
	 * 转换序号为字母A/B/C/D/....
	 * @param num 数字
	 * @return
	 */
	public static String replaceOptions(Integer num) {
		if(num==null || num<0 || num>26) num = 1;
		String options = ((char)(num+64))+"";
		return options;
	}
	
	
	/**
	 * 解析付费率 
	 * @param chargeNum 充值人数
	 * @param regNum 注册人数
	 * @return 格式：78.00%
	 */
	public static String analyticPay(int chargeNum, int regNum){
		if(regNum == 0)
			return "0.0%";
		String value = "";
		float f = (float)chargeNum / (float)regNum;
		value = (Math.round(f*10000) / (float)100) + "%";
		/**
		if(f < 1.0f){
			value = (Math.round(f*10000) / (float)100) + "%";
		}else{
			value = (Math.round(f*100) / (float)100) + "%";
		}
		**/
		return value;
	}
	
	/**
	 * 除法运算
	 * @param member 分子
	 * @param denominator 分母
	 * @return
	 */
	public static String division(int member,int denominator){
		if(denominator>0){
			double d = (double)member/(double)denominator;
			BigDecimal bd = new BigDecimal(d);     
		    BigDecimal bd2 = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
		    return bd2+"";
		}
		return "0";
	}
	
	
	
	
	/**
	 * 转换字符串日期显示格式
	 * @param data 字符串日期数据
	 * @param formatData 日期格式
	 * @param formatStr	 最终显示格式
	 * @return
	 */
	public static String dataStrToStr(String data, String formatData, String formatStr) {
		String str = "";
		try {
			Date date = StrUtil.getStrByDataTime(data, formatData);
			str = StrUtil.getDateTimeByStr(date, formatStr);
		} catch (RuntimeException e) {
			e.printStackTrace();
		}
		return str;
	}
	
	
	
	/**
	 * 2个数相差多少
	 * @param A 数字
	 * @param B 数字
	 * @return
	 */
	public static boolean differ(double A,double B){
		boolean	fle=true;
		double num=0;
		if(A>B){
			 num=A-B;
		 }else{
			 num=B-A; 
		 }
		
		if(num>1000)
			fle=false;
		return fle;
	}
	
	/**
	 * 格式化金额
	 */
	public static String formatDoubleToMoney(Double number){
		DecimalFormat format = new DecimalFormat();
		format.applyPattern("##,###0.00");
		return null==number?"0.00":format.format(number);
		
	}
	
	public static String formatIntegerToMoney(Integer number){
		DecimalFormat format = new DecimalFormat();
		format.applyPattern("##,###");
		return null==number?"0":format.format(number);
	}
	
	public static void main(String[] args) {
//		 double value = (double)1/(double)3;
//		 BigDecimal bd = new BigDecimal(value);     
//	     BigDecimal bd2 = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
//	     System.out.println(bd2);
//		System.out.println(division(1,3));
		System.out.println(formatDoubleToMoney(0.031));
	}
	
}

//注意 java 代码中的方法一定要为静态的，否则会报空指针错误