模板引擎
什么是模板引擎
主流的模板引擎
Freemarker
什么是Freemarker
JSP与Freemarker区别
第一个Freemarker
package com.jesse.freemarker;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
import freemarker.core.ParseException;
import freemarker.template.Configuration;
import freemarker.template.MalformedTemplateNameException;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateNotFoundException;
public class FreemarkerSample1 {
public static void main(String[] args) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException {
// TODO Auto-generated method stub
//1. 加载模板
//创建核心配置对象
Configuration config = new Configuration(Configuration.VERSION_2_3_29);
//设置加载的目录
config.setClassForTemplateLoading(FreemarkerSample1.class, "");
//得到模板对象
Template t = config.getTemplate("sample1.ftl");
//2. 创建数据
Map<String,Object> data = new HashMap<String,Object>();
data.put("site", "新浪");
data.put("url", "http://www.sina.com");
//3. 产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}
${site}
${url}
Freemarker基本语法
FTL取值
分支判断
Example1
package com.jesse.freemarker.entity;
import java.util.Date;
import java.util.Map;
public class Computer {
private String sn;
private String model;
private int state;
private String user;
private Date dop;
private Float price;
private Map info;
public Computer() {
}
public Computer(String sn, String model, int state, String user, Date dop, Float price, Map info) {
super();
this.sn = sn;
this.model = model;
this.state = state;
this.user = user;
this.dop = dop;
this.price = price;
this.info = info;
}
public String getSn() {
return sn;
}
public void setSn(String sn) {
this.sn = sn;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public Date getDop() {
return dop;
}
public void setDop(Date dop) {
this.dop = dop;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public Map getInfo() {
return info;
}
public void setInfo(Map info) {
this.info = info;
}
}
package com.jesse.freemarker;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.jesse.freemarker.entity.Computer;
import freemarker.core.ParseException;
import freemarker.template.Configuration;
import freemarker.template.MalformedTemplateNameException;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateNotFoundException;
public class FreemarkerSample1 {
public static void main(String[] args) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException {
// TODO Auto-generated method stub
//1. 加载模板
//创建核心配置对象
Configuration config = new Configuration(Configuration.VERSION_2_3_29);
//设置加载的目录
config.setClassForTemplateLoading(FreemarkerSample1.class, "");
//得到模板对象
Template t = config.getTemplate("sample1.ftl");
//2. 创建数据
Map<String,Object> data = new HashMap<String,Object>();
data.put("site", "新浪");
data.put("url", "http://www.sina.com");
data.put("date", new Date());
data.put("number", 837183.883217);
Map info = new HashMap();
info.put("cpu", "i5");
Computer c1 = new Computer("1234567", "ThinkPad", 2, "李四", new Date(), 12900f, info);
data.put("computer", c1);
//3. 产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}
<#-- FreeMarker取值 -->
${site}
${url}
<#-- !默认值 -->
${author!"不存在的属性"}
<#-- ?string格式化输出 -->
${date?string("yyyy年MM月dd日 HH:mm:ss SSS")}
${number?string("0.00")}
<#if computer.sn == "1234567">
重要设备
</#if>
SN:${computer.sn}
型号:${computer.model}
<#if computer.state == 1>
状态：正在使用
<#elseif computer.state == 2>
状态：闲置
<#elseif computer.state == 3>
状态：已作废
</#if>
<#switch computer.state>
<#case 1>
状态：正在使用
<#break>
<#case 2>
状态：闲置
<#break>
<#case 3>
状态：已作废
<#break>
<#default>
状态：无效状态
</#switch>
<#-- ??代表判断对象是否为空,true不为空,false为空 -->
<#if computer.user??>
用户:${computer.user}
</#if>
采购时间:${computer.dop?string("yyyy-MM-dd")}
采购价格:${computer.price?string("0.00")}
配置信息：
--------------
CPU:${computer.info["cpu"]}
内存: ${computer.info["memory"]!"内存不存在!"}
list迭代列表与Map
Example2
package com.jesse.freemarker.entity;
import java.util.Date;
import java.util.Map;
public class Computer {
private String sn;
private String model;
private int state;
private String user;
private Date dop;
private Float price;
private Map info;
public Computer() {
}
public Computer(String sn, String model, int state, String user, Date dop, Float price, Map info) {
super();
this.sn = sn;
this.model = model;
this.state = state;
this.user = user;
this.dop = dop;
this.price = price;
this.info = info;
}
public String getSn() {
return sn;
}
public void setSn(String sn) {
this.sn = sn;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public Date getDop() {
return dop;
}
public void setDop(Date dop) {
this.dop = dop;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public Map getInfo() {
return info;
}
public void setInfo(Map info) {
this.info = info;
}
package com.jesse.freemarker;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.jesse.freemarker.entity.Computer;
import freemarker.core.ParseException;
import freemarker.template.Configuration;
import freemarker.template.MalformedTemplateNameException;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateNotFoundException;
public class FreemarkerSample2 {
public static void main(String[] args) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException {
// TODO Auto-generated method stub
//1. 加载模板
//创建核心配置对象
Configuration config = new Configuration(Configuration.VERSION_2_3_29);
//设置加载的目录
config.setClassForTemplateLoading(FreemarkerSample2.class, "");
//得到模板对象
Template t = config.getTemplate("sample2.ftl");
//2. 创建数据
Map<String,Object> data = new HashMap<String,Object>();
List<Computer> computers = new ArrayList<>();
computers.add(new Computer("1234567", "ThinkPad", 2, null, new Date(), 12900f, new HashMap()));
computers.add(new Computer("1234367", "HP XXX", 1, "李四", new Date(), 13900f, new HashMap()));
computers.add(new Computer("1234767", "DELL XXX", 3, "张三", new Date(), 11900f, new HashMap()));
computers.add(new Computer("1234967", "ACER XXX", 1, "王五", new Date(), 12500f, new HashMap()));
computers.add(new Computer("1234867", "MSI XXX", 2, "赵六", new Date(), 12930f, new HashMap()));
data.put("computers", computers);
//LinkedHashMap可以保证数据按存放顺序进行提取
Map computerMap = new LinkedHashMap();
for(Computer c : computers) {
computerMap.put(c.getSn(), c);
}
data.put("computer_map", computerMap);
//3. 产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}
<#list computers as c>
序号:${c_index + 1} <#-- 迭代变量_index保存了循环的索引,从0开始 -->
SN:${c.sn}
型号:${c.model}
<#switch c.state>
<#case 1>
状态:使用中
<#break>
<#case 2>
状态:闲置
<#break>
<#case 3>
状态:已作废
<#break>
</#switch>
<#if c.user??>
用户:${c.user}
</#if>
采购日期:${c.dop?string("yyyy-MM-dd")}
采购价格:${c.price?string("0.00")}
-------------------------------------------------
</#list>
===============================
<#list computer_map?keys as k>
${k}-${computer_map[k].model}
${computer_map[k].price?string("0.00")}
</#list>
Freemarker内建函数
package com.jesse.freemarker.entity;
import java.util.Date;
import java.util.Map;
public class Computer {
private String sn;
private String model;
private int state;
private String user;
private Date dop;
private Float price;
private Map info;
public Computer() {
}
public Computer(String sn, String model, int state, String user, Date dop, Float price, Map info) {
super();
this.sn = sn;
this.model = model;
this.state = state;
this.user = user;
this.dop = dop;
this.price = price;
this.info = info;
}
public String getSn() {
return sn;
}
public void setSn(String sn) {
this.sn = sn;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public Date getDop() {
return dop;
}
public void setDop(Date dop) {
this.dop = dop;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public Map getInfo() {
return info;
}
public void setInfo(Map info) {
this.info = info;
}
}
package com.jesse.freemarker;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.jesse.freemarker.entity.Computer;
import freemarker.core.ParseException;
import freemarker.template.Configuration;
import freemarker.template.MalformedTemplateNameException;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateNotFoundException;
public class FreemarkerSample3 {
public static void main(String[] args) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException {
// TODO Auto-generated method stub
//1. 加载模板
//创建核心配置对象
Configuration config = new Configuration(Configuration.VERSION_2_3_29);
//设置加载的目录
config.setClassForTemplateLoading(FreemarkerSample3.class, "");
//得到模板对象
Template t = config.getTemplate("sample3.ftl");
//2. 创建数据
Map<String,Object> data = new HashMap<String,Object>();
data.put("name", "jackson");
data.put("brand", "bmw");
data.put("words", "first blood");
data.put("n", 37981.83);
data.put("date", new Date());
List<Computer> computers = new ArrayList<>();
computers.add(new Computer("1234567", "ThinkPad", 2, null, new Date(), 12900f, new HashMap()));
computers.add(new Computer("1234367", "HP XXX", 1, "李四", new Date(), 13900f, new HashMap()));
computers.add(new Computer("1234767", "DELL XXX", 3, "张三", new Date(), 11900f, new HashMap()));
computers.add(new Computer("1234967", "ACER XXX", 1, "王五", new Date(), 12500f, new HashMap()));
computers.add(new Computer("1234867", "MSI XXX", 2, "赵六", new Date(), 12930f, new HashMap()));
data.put("computers", computers);
//3. 产生输出
t.process(data, new OutputStreamWriter(System.out));
}
}
<#-- http://freemarker.foofun.cn -->
${name?cap_first}
${brand?upper_case}
${brand?length}
${words?replace("blood", "*****")}
${words?index_of("blood")}
<#-- 利用?string实现三目运算符的操作 -->
${(words?index_of("blood") != -1)?string("包含敏感词汇", "不包含敏感词汇")}
${n?round}
${n?floor}
${n?ceiling}
公司共有${computers?size}台电脑
第一台:${computers?first.model}
最后一台:${computers?last.model}
<#list computers?sort_by("price")?reverse as c>
${c.sn}-${c.price}
</#list>
案例：员工信息表（Freemarker与Servlet整合）
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>fm-web</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>freemarker</servlet-name>
<servlet-class>freemarker.ext.servlet.FreemarkerServlet</servlet-class>
<init-param>
<param-name>TemplatePath</param-name>
<param-value>/WEB-INF/ftl</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>freemarker</servlet-name>
<url-pattern>*.ftl</url-pattern>
</servlet-mapping>
</web-app>
package com.jesse.freemaker.servlet;
public class Employee {
private Integer empno;
private String ename;
private String department;
private String job;
private Float salary;
public Employee(){
}
public Employee(Integer empno, String ename, String department, String job, Float salary) {
super();
this.empno = empno;
this.ename = ename;
this.department = department;
this.job = job;
this.salary = salary;
}
public Integer getEmpno() {
return empno;
}
public void setEmpno(Integer empno) {
this.empno = empno;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public Float getSalary() {
return salary;
}
public void setSalary(Float salary) {
this.salary = salary;
}
}
package com.jesse.freemaker.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class ListServlet
*/
@WebServlet("/list")
public class ListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ListServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Employee> list = new ArrayList<Employee>();
list.add(new Employee(1100, "孔金星", "Java工程师", "项目经理", 20000f));
list.add(new Employee(1101, "赖玉财", "光学工程师", "研发经理", 25000f));
request.setAttribute("employeeList", list);
request.getRequestDispatcher("/employee.ftl").forward(request, response);
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>员工列表</title>
<link href="css/bootstrap.css" type="text/css" rel="stylesheet"></link>
<script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="js/bootstrap.js"></script>
<style type="text/css">
.pagination {
margin: 0px
}
.pagination > li > a, .pagination > li > span {
margin: 0 5px;
border: 1px solid #dddddd;
}
.glyphicon {
margin-right: 3px;
}
.form-control[readonly] {
cursor: pointer;
background-color: white;
}
#dlgPhoto .modal-body{
text-align: center;
}
.preview{
max-width: 500px;
}
</style>
<script>
$(function () {
$("#btnAdd").click(function () {
$('#dlgForm').modal()
});
})
</script>
</head>
<body>
<div class="container">
<div class="row">
<h1 style="text-align: center">IMOOC员工信息表</h1>
<div class="panel panel-default">
<div class="clearfix panel-heading ">
<div class="input-group" style="width: 500px;">
<button class="btn btn-primary" id="btnAdd"><span class="glyphicon glyphicon-zoom-in"></span>新增
</button>
</div>
</div>
<table class="table table-bordered table-hover">
<thead>
<tr>
<th>序号</th>
<th>员工编号</th>
<th>姓名</th>
<th>部门</th>
<th>职务</th>
<th>工资</th>
<th> </th>
</tr>
</thead>
<tbody>
<#list employeeList as emp>
<tr>
<td>${emp_index + 1}</td>
<td>${emp.empno?string("0")}</td>
<td>${emp.ename}</td>
<td>${emp.department}</td>
<td>${emp.job}</td>
<td style="color: red;font-weight: bold">￥${emp.salary?string("0.00")}</td>
</tr>
</#list>
</tbody>
</table>
</div>
</div>
</div>
<!-- 表单 -->
<div class="modal fade" tabindex="-1" role="dialog" id="dlgForm">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>
</button>
<h4 class="modal-title">新增员工</h4>
</div>
<div class="modal-body">
<form action="#" method="post" >
<div class="form-group">
<label for="empno">员工编号</label>
<input type="text" name="empno" class="form-control" id="empno" placeholder="请输入员工编号">
</div>
<div class="form-group">
<label for="ename">员工姓名</label>
<input type="text" name="ename" class="form-control" id="ename" placeholder="请输入员工姓名">
</div>
<div class="form-group">
<label>部门</label>
<select id="dname" name="department" class="form-control">
<option selected="selected">请选择部门</option>
<option value="市场部">市场部</option>
<option value="研发部">研发部</option>
<option value="后勤部">后勤部</option>
</select>
</div>
<div class="form-group">
<label>职务</label>
<input type="text" name="job" class="form-control" id="sal" placeholder="请输入职务">
</div>
<div class="form-group">
<label for="sal">工资</label>
<input type="text" name="salary" class="form-control" id="sal" placeholder="请输入工资">
</div>
<div class="form-group" style="text-align: center;">
<button type="submit" class="btn btn-primary">保存</button>
</div>
</form>
</div>
</div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->
</div><!-- /.modal -->
</body>
</html>
浙公网安备 33010602011771号