package com.hdwang;import java.util.HashMap;
import java.util.Map;/*** Created by hdwang on 2017/12/19.*/
public class MyTemplate {public static void main(String[] args){String template = "${name},${sex},${birthYear}年出生,${graduateYear}年毕业于${university}。";Map<String,String> params = new HashMap<>();params.put("name","张三");params.put("sex","男");params.put("birthYear","1990");params.put("graduateYear","2012");params.put("university","清华大学");long start = System.currentTimeMillis();for(int i=0;i<10000;i++) {String result = render(template, params);if(i==9999) {System.out.println(result);}}long end = System.currentTimeMillis();System.out.println("cost time:"+(end-start)+"ms");start = System.currentTimeMillis();for(int i=0;i<10000;i++) {String result = render2(template, params);if(i==9999) {System.out.println(result);}}end = System.currentTimeMillis();System.out.println("cost time:"+(end-start)+"ms");}public static String render(String template,Map<String,String> params){//使用builder拼接，比string相加提高不少效率StringBuilder builder = new StringBuilder();//定义控制变量boolean $Begin = false;boolean paramBegin = false;//boolean paramEnd = false;StringBuilder key = null;//循环匹配for(int i=0;i<template.length();i++){char c = template.charAt(i);//开始标识if(c=='$'){$Begin = true;}if($Begin && c=='{'){paramBegin = true;builder.deleteCharAt(builder.length()-1); //删除添加的$字符
key = new StringBuilder();continue;}//参数keyif(paramBegin && c!='}'){if(c=='{'){System.out.println("模板格式错误！位置："+i);}else {key.append(c);}continue;}//结束标识if(paramBegin && c=='}'){//paramEnd = true;//拼接参数key对应的值
                builder.append(params.get(key.toString()));//重置控制变量$Begin = false;paramBegin = false;//paramEnd = false;continue;}//默认情况builder.append(c); //添加字符
        }return builder.toString();}public static String render2(String template,Map<String,String> params){for(Map.Entry<String,String> entry:params.entrySet()){String key = entry.getKey();String value = entry.getValue();template = template.replace("${"+key+"}",value);}return template;}
}