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文件目录
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注意这里是普通的java类，再lib文件中添加了jar后，需要右键build path -> add ..path
//FreemarkerSample1.java
package com.imooc.freemarker;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.imooc.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_28);
//设置加载的目录,在FreemarkerSample1.class包中加载，ftl文件，空代表当前路径
config.setClassForTemplateLoading(FreemarkerSample1.class, "");
//得到模板对象
Template t = config.getTemplate("sample1.ftl");
//2.创建数据
Map data = new HashMap();
data.put("site","百度");
data.put("url","http://www.baidu.com");
data.put("date",new Date());
data.put("number",837183.88833);
Map info = new HashMap();
info.put("cpu", "i5");
Computer c1 = new Computer("1234567","Thinkpad",1,"李四",new Date(),12900f,info);
data.put("computer",c1);
//3.产生输出
//System.out输出的是字节流，process输出的是字符流，因此需要进行转换
t.process(data,new OutputStreamWriter(System.out));
}
}
//sample1.ftl
<#-- 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}
${number?string("0.00")}
<#-- 输出对象 -->
SN:${computer.sn}
型号:${computer.model}
配置信息:${computer.info["cpu"]}
配置信息:${computer.info.cpu}
<#if computer.state == 1>
状态:正在使用
<#elseif computer.state == 2>
状态:闲置
<#elseif computer.state == 3>
状态:已作废
<#else>
状态:无效状态
<#if computer.user??> <#-- 判断不为空 true不为空 -->
用户:${computer.user}
<#if computer.sn == "1234567"> <#-- 字符串相等 用 == -->
重要设备
<#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
//FreemarkerSample2.java
package com.imooc.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.imooc.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_28);
//设置加载的目录,在FreemarkerSample1.class包中加载，ftl文件，空代表当前路径
config.setClassForTemplateLoading(FreemarkerSample2.class, "");
//得到模板对象
Template t = config.getTemplate("sample2.ftl");
//2.创建数据
Map data = new HashMap();
List computers = new ArrayList();
computers.add(new Computer("1234567","Thinkpad1",1,"李四1",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234568","Thinkpad2",1,"李四2",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234569","Thinkpad3",1,"李四3",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234570","Thinkpad4",1,"李四4",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234571","Thinkpad5",1,"李四5",new Date(),12900f,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("computers_map", computerMap);
//3.产生输出
//System.out输出的是字节流，process输出的是字符流，因此需要进行转换
t.process(data,new OutputStreamWriter(System.out));
}
}
//sample2.ftl
<#list computers as c>
序号:${c_index + 1} <#-- 循环索引 -->
SN:${c.sn}
型号:${c.model}
状态:${c.state}
用户:${c.user}
采购日期:${c.dop?string("yyyy-MM-dd")}
采购价格:${c.price?string("0.00")}
======================================================
<#list computers_map?keys as k>
${k} - ${computers_map[k].model}
${computers_map[k].price?string("0.00")}
2.内建函数
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//FreemarkerSample3 .java
package com.imooc.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.imooc.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_28);
//设置加载的目录,在FreemarkerSample1.class包中加载，ftl文件，空代表当前路径
config.setClassForTemplateLoading(FreemarkerSample3.class, "");
//得到模板对象
Template t = config.getTemplate("sample3.ftl");
//2.创建数据
Map data = new HashMap();
data.put("name", "jackson");
data.put("brand", "bmw");
data.put("words", "first blood");
data.put("n",37981.83);
data.put("data", new Date());
List computers = new ArrayList();
computers.add(new Computer("1234567","Thinkpad1",1,"李四1",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234568","Thinkpad2",1,"李四2",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234569","Thinkpad3",1,"李四3",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234570","Thinkpad4",1,"李四4",new Date(),12900f,new HashMap()));
computers.add(new Computer("1234571","Thinkpad5",1,"李四5",new Date(),12900f,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("computers_map", computerMap);
//3.产生输出
//System.out输出的是字节流，process输出的是字符流，因此需要进行转换
t.process(data,new OutputStreamWriter(System.out));
}
}
//sample3.ftl
${name?cap_first}
${brand?upper_case}
${brand?length}
${words?replace("blood","*****")}
${words?index_of("blood")}
${(words?index_of("blood") != -1)?string("包含敏感词汇","不包含敏感词汇")} <#-- string三目运算 -->
${n?round} <#-- 四舍五入 -->
${n?floor} <#-- 下取整 -->
${n?ceiling} <#-- 上取整 -->
公司共有${computers?size}台电脑
第一台:${computers?first.model}
最后一台${computers?last.model}
<#list computers?sort_by("price") as c> <#-- 升序 -->
${c.sn} - ${c.price}
<#list computers?sort_by("price")?reverse as c> <#-- 降序 -->
${c.sn} - ${c.price}
<#-- freemarker.foofun.cn 查询更多内建函数-->
freemarker.foofun.cn 查询更多内建函数
3.freemarker与servlet联动
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//Employee.java
package com.imooc.freemarker.servlet;
public class Employee {
private Integer empno;
private String ename;
private String department;
private String job;
private Float salary;
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 Employee() {
super();
}
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;
}
}
//ListServlet.java
package com.imooc.freemarker.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 list = new ArrayList();
list.add(new Employee(7731,"张三","市场部","客户代表",8000f));
list.add(new Employee(8871,"李四","研发部","运维工程师",7000f));
list.add(new Employee(7732,"王五","市场部","客户代表",8000f));
request.setAttribute("employee_list", list);
//利用转发进行跳转
request.getRequestDispatcher("/employee.ftl").forward(request, response);
}
}
//employee.ftl
员工列表
IMOOC员工信息表
序号
员工编号
姓名
部门
职务
工资
<#-- 注意，对 employee_list进行属性获取时，依次自动从request session context 域中查找属性 -->
<#list employee_list as emp>
${emp_index + 1}
${emp.empno?string("0")}
${emp.ename}
${emp.department}
${emp.job}
￥${emp.salary?string("0.00")}
html代码写在ftl文件中
//web.xml
fm-web
index.html
index.htm
index.jsp
default.html
default.htm
default.jsp
freemarker
freemarker.ext.servlet.FreemarkerServlet
TemplatePath
/WEB-INF/ftl
freemarker
*.ftl