velocity 将模板和内容合并起来 邮件渲染

注意：变量中不能有空格

package utils;


import java.io.StringWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;

import com.jje.common.utils.DateUtils;

public class TemplateUtils {

	
	public static void main(String[] args) {
        String json = "{\"Now_Tier\":\"黑卡\",\"Keep_Tier_Point\":\"0\",\"Keep_Tier_Night\":\"0\",\"Card_Number\":\"7700076294\",\"Current_Points\":\"0\",\"Current_Nights\":\"0\",\"Expire_Year\":\"2016\",\"Expire_Month\":\"10\",\"Expire_Day\":\"31\",\"Name\":\"winnie_test4\"}";
        final Map<String,Object> map = JsonUtils.jsonToMap(json);
        String r = "${Now_Tier}会员完成${Keep_Tier_Point}定级积分或${Keep_Tier_Night}定级次数即可保级。\n" +
                "以下是您的会员卡${Card_Number}信息：\n" +
                "已完成定级积分：${Current_Points}分\n" +
                "已完成定级次数：${Current_Nights}次\n" +
                "\n" +
                "★10分钟内回复“XF”或直接点击”详情“即可直接续费金卡。如有疑问可拨打1010-1666。\n" +
                "详情>";

        String sr = TemplateUtils.renderTemplate(r, map);
        System.out.println(sr);
	}
    public static String renderTemplate(String template,Map<String,Object> map) {
        while(template.contains("%%")){
            template = template.replace("%%","$");
        }
        map.put("dateUtils",new DateUtils());
        map.put("stringUtils",new StringUtils());
        // 初始化并取得Velocity引擎
        VelocityEngine engine = initProperties();
        // 取得velocity的上下文context
        VelocityContext context = new VelocityContext();
        // 把数据填入上下文
        Iterator it = map.keySet().iterator();
        while(it.hasNext()){
            String key = (String) it.next();
            Object value = map.get(key);
            context.put(key,value);
        }
        StringWriter writer = new StringWriter();
        engine.evaluate(context, writer, "", template);
        return writer.toString();
    }

    private static VelocityEngine initProperties() {
        Properties p = new Properties();
        p.setProperty("resource.loader", "class");
        p.setProperty("class.resource.loader.class","org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        VelocityEngine ve = new VelocityEngine();
        ve.init(p);
        return ve;
    }




}