beetl模板入门例子

加入maven依赖

<dependency>
    <groupId>org.beetl</groupId>
    <artifactId>beetl-core</artifactId>
    <version>2.2.3</version>
</dependency>

模板文件 src/main/resources/template/hello.btl 的内容为：

hello ${name}
你好：${name}

例子代码如下：

package com.lala.template;

import org.beetl.core.Configuration;
import org.beetl.core.GroupTemplate;
import org.beetl.core.Template;
import org.beetl.core.resource.ClasspathResourceLoader;
import org.beetl.core.resource.FileResourceLoader;
import org.beetl.core.resource.StringTemplateResourceLoader;

public class Beetl
{
    /**
     * 加载classpath下的资源
     * @throws Exception
     */
    static void classpathRL()throws Exception
    {
        ClasspathResourceLoader resourceLoader = new ClasspathResourceLoader();
        Configuration cfg = Configuration.defaultConfiguration();
        GroupTemplate gt = new GroupTemplate(resourceLoader, cfg);
        Template t = gt.getTemplate("/template/hello.btl");
        t.binding("name", "beetl");
        String str = t.render();
        System.out.println(str);
    }

    /**
     * 加载文件系统下的资源
     * @throws Exception
     */
    static void filePathRL()throws Exception
    {
        String root = "E:\pp\src\camel-web\src\main\resources\template";
        FileResourceLoader resourceLoader = new FileResourceLoader(root,"utf-8");
        Configuration cfg = Configuration.defaultConfiguration();
        GroupTemplate gt = new GroupTemplate(resourceLoader, cfg);
        Template t = gt.getTemplate("hello.btl");
        t.binding("name", "beetl");
        String str = t.render();
        System.out.println(str);
    }

    /**
     * 直接构建字符串
     * @throws Exception
     */
    static void stringBeetl()throws Exception
    {
        StringTemplateResourceLoader resourceLoader = new StringTemplateResourceLoader();
        Configuration cfg = Configuration.defaultConfiguration();
        GroupTemplate gt = new GroupTemplate(resourceLoader, cfg);
        Template t = gt.getTemplate("hello,${name} 
你好：${name}");
        t.binding("name", "beetl");
        String str = t.render();
        System.out.println(str);
    }
}

servlet例子如下：

package com.lala.template;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.beetl.core.Configuration;
import org.beetl.core.GroupTemplate;
import org.beetl.core.Template;
import org.beetl.core.resource.WebAppResourceLoader;

@WebServlet("/beetl")
public class BeetlServlet extends HttpServlet
{
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
    {
        resp.setCharacterEncoding("UTF-8");
        resp.setContentType("text/html;charset=UTF-8");
        WebAppResourceLoader  resourceLoader = new WebAppResourceLoader(this.getServletContext().getRealPath("/"), "UTF-8");
        Configuration cfg = Configuration.defaultConfiguration();
        GroupTemplate gt = new GroupTemplate(resourceLoader, cfg);
        Template t = gt.getTemplate("/template/webhello.btl");
        t.binding("name", "beetl");
        t.renderTo(resp.getWriter());
    }
}