目录

• Freemarker
  
  
  • 简介
  
  
  • 安装使用
  
  
  • FIL取值
  
  
  • list迭代列表
  
  
  • list迭代Map
  
  
  • 内建函数
  
  
  • Freemarker与Servlet整合
  
  

Freemarker

简介

• FreeMarker 是一款 主流的模板引擎： 即一种基于模板和要改变的数据， 并用来生成输出文本(HTML网页，电子邮件，配置文件，源代码等)的通用工具。


• 模板引擎的目标是数据+模板=结果
  
  


• 模板编写为FreeMarker Template Language (FTL)。它是简单的，专用的语言，

安装使用

下载地址:http://mirror.bit.edu.cn/apache/freemarker/engine/2.3.28/binaries/apache-freemarker-2.3.28-bin.tar.gz

使用步骤：

• 加载模板

  
  
  
  
  • 创建核心配置对象
  
  
  • 设置加载目录
  
  
  • 获取模板对象
  
  



• 创建数据




• 产生输出

FreemarkerDemo1.java

//创建核心配置对象
Configuration cOnfiguration= new Configuration(Configuration.VERSION_2_3_28);
//设置加载目录
configuration.setClassForTemplateLoading(FreemarkerDemo1.class,"");
//得到模板对象
Template t = configuration.getTemplate("demo2.ftl");
//创建数据
Map data = new HashMap();
List students=new ArrayList<>();
students.add(new Student("1001","Jack",18));
students.add(new Student("1002","Lucy",17));
students.add(new Student("1003","Tom",19));
students.add(new Student("1004","Tim",20));
students.add(new Student("1005","Marry",18));
data.put("students",students);
//产生输出
t.process(data, new OutputStreamWriter(System.out));

FIL取值

语法：

${属性} ${name} ${student.name}

${属性 ! 默认值} ${name ! "不存在该属性"}

${属性 ？String()} ${salary ? String("0.00")}

list迭代列表

Student.java

package entity;
public class Student {
private String sno;
private String name;
private Integer age;
public Student(String sno, String name, Integer age) {
this.sno = sno;
this.name = name;
this.age = age;
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}


FreemarkerDemo2.java

package freemarker;
import entity.Student;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.*;
public class FreemarkerDemo2 {
public static void main(String[] args) throws IOException, TemplateException {
//创建核心配置对象
Configuration cOnfiguration= new Configuration(Configuration.VERSION_2_3_28);
//设置加载目录
configuration.setClassForTemplateLoading(FreemarkerDemo2.class,"");
//得到模板对象
Template t = configuration.getTemplate("demo2.ftl");
//创建数据
Map data = new HashMap();
List students=new ArrayList<>();
students.add(new Student("1001","Jack",18));
students.add(new Student("1002","Lucy",17));
students.add(new Student("1003","Tom",19));
students.add(new Student("1004","Tim",20));
students.add(new Student("1005","Marry",18));
data.put("students",students);
//产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}


demo2.ftl

<#list students as s>
序号:${s_index+1}
学号:${s.sno}
姓名:${s.name}
年龄:${s.age}
-------------------------------


list迭代Map

FreemarkerDemo3.java

package freemarker;
import entity.Student;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.*;
public class FreemarkerDemo3 {
public static void main(String[] args) throws IOException, TemplateException {
//创建核心配置对象
Configuration cOnfiguration= new Configuration(Configuration.VERSION_2_3_28);
//设置加载目录
configuration.setClassForTemplateLoading(FreemarkerDemo3.class,"");
//得到模板对象
Template t = configuration.getTemplate("demo3.ftl");
//创建数据
Map data = new HashMap();
List students=new ArrayList<>();
students.add(new Student("1001","Jack",18));
students.add(new Student("1002","Lucy",17));
students.add(new Student("1003","Tom",19));
students.add(new Student("1004","Tim",20));
students.add(new Student("1005","Marry",18));
data.put("students",students);
Map studentMap=new LinkedHashMap();
for(Student s:students){
studentMap.put(s.getSno(),s);
}
data.put("studentMap",studentMap);
//产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}


Demo03.ftl

<#list studentMap?keys as k>
${k}-${studentMap[k].name}


内建函数

参考手册：http://freemarker.foofun.cn/

Freemarker与Servlet整合

• 在WEB-INF目录下的lib文件夹中导入freemarker包


• 配置web.xml文件


xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">

freemarker
freemarker.ext.servlet.FreemarkerServlet




TemplatePath


/WEB-INF/ftl



freemarker

*.ftl



• 编写Servlet类

package Freemarker;
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 java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@WebServlet("/fre_servlet")
public class FreemarkerServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("----------------------------");
List

• 编写ftl文件

<#list students as student>
学号：${student.sno}-----姓名：${student.name}


• 启动Tomcat，访问Servlet