FreeMarker Template Language (FTL)
文档：
依赖
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.31</version>
</dependency>
使用示例
package com.pengshiyu;
import freemarker.template.Configuration;
import freemarker.template.Template;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
public class FreemarkerDemo {
public static void main(String[] args) throws Exception {
// 第一步：配置freemarker
Configuration configuration = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
// 设置模板路径
configuration.setDirectoryForTemplateLoading(new File("./"));
// 第二步：加载模板
Template template = configuration.getTemplate("template.ftl");
// 第三步：模板数据
Map<String, Object> data = new HashMap<>();
data.put("name", "汤姆");
data.put("age", 23);
// 第四步：渲染输出
// 输出到字符串
Writer stringWriter = new StringWriter();
template.process(data, stringWriter);
stringWriter.close();
System.out.println(stringWriter.toString());
// 输出到文件
Writer fileWriter = new FileWriter(new File("hello.html"));
template.process(data, fileWriter);
fileWriter.close();
}
}
模板文件 template.ftl
<html>
<head>
<title>Demo</title>
</head>
<body>
<p>${name}</p>
<p>${age}</p>
</body>
</html>
输出结果 hello.html
<html>
<head>
<title>Demo</title>
</head>
<body>
<p>汤姆</p>
<p>23</p>
</body>
</html>
问题及解决
报错
严重: DefaultObjectWrapper.incompatibleImprovements was set to the object returned by Configuration.getVersion(). That defeats the purpose of incompatibleImprovements, and makes upgrading FreeMarker a potentially breaking change. Also, this probably won't be allowed starting from 2.4.0. Instead, set incompatibleImprovements to the highest concrete version that's known to be compatible with your application.
解决方式
// 不推荐使用
Configuration configuration = new Configuration(Configuration.getVersion());
// 修改为：
Configuration configuration = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
模板语法
<#-- 注释 取出变量 -->
Hello ${name}
<#-- if判断-->
<#if name == "Tom">
<span>is Tom</span>
<#elseif name == "Jack">
<span>is Jack</span>
<#else>
<span>not is Tom</span>
</#if>
<#--for循环-->
<#list list as item>
<p>${item.name} ${item.age}</p>
</#list>
<#-- 引入模板 -->
<#include "./footer.html">
