beetl模板入门例子

超、凢脫俗 2022-08-03 13:41 143阅读 0赞

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,${name} \r\n你好：${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());
    	}
    }