一、最原始示例

1、引入POM依赖

        <!-- https://mvnrepository.com/artifact/org.freemarker/freemarker -->

        <dependency>

            <groupId>org.freemarker</groupId>

            <artifactId>freemarker</artifactId>

            <version>2.3.26-incubating</version>

        </dependency>

        <!-- Servlet Library -->

        <!-- http://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>javax.servlet-api</artifactId>

            <version>3.1.0</version>

            <scope>provided</scope>

        </dependency>

2、在WEB-INF/ftl中建立test.ftl

<html>

<head>

  <title>Welcome!</title>

</head>

<body>

  <h1>

    Welcome ${user}<#if user == "Big Joe">, our beloved leader</#if>!

  </h1>

</body>

</html>

3、添加TestServlet.java

package com.jsoft.testfreemarker;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

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 freemarker.template.Configuration;

import freemarker.template.Template;

/**

 * Servlet implementation class TestServlet

 */

@WebServlet(name = "test", urlPatterns = "/test")

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private Configuration cfg;

    @Override

    public void init() throws ServletException {

        // initialize operation

        cfg = new Configuration(Configuration.VERSION_2_3_26);

        cfg.setServletContextForTemplateLoading(getServletContext(), "WEB-INF/ftl");

    }

    /**

     * Default constructor.

     */

    public TestServlet() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setCharacterEncoding("utf-8");

        Map<String, Object> data = new HashMap<String, Object>();

        data.put("user", "Big Joe");

        // 得到模板

        try {

            // 将模板和数据结合，并返回浏览器

            Template template = cfg.getTemplate("test.ftl");

            template.process(data, response.getWriter());

        } catch (Exception e) {

            // e.printStackTrace();

            response.getWriter().print("暂时无数据");

        }

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

提示：采用了Servlet3.x的注解功能，不需要在web.xml中再配置映射。

4、测试效果

测试工程：https://github.com/easonjim/5_java_example/tree/master/freemarker/test2

二、高级一点的集成

1、在web.xml引入FreeMarker提供的Servlet

    <servlet>

        <servlet-name>freemarker</servlet-name>

        <servlet-class>freemarker.ext.servlet.FreemarkerServlet</servlet-class>

        <init-param>

            <param-name>TemplatePath</param-name>

            <param-value>/</param-value>

        </init-param>

        <init-param>

            <param-name>NoCache</param-name>

            <param-value>true</param-value>

        </init-param>

        <init-param>

            <param-name>ContentType</param-name>

            <param-value>text/html;charset=UTF-8</param-value>

        </init-param>

        <init-param>

            <param-name>template_update_delay</param-name>

            <param-value>0</param-value>

        </init-param>

        <init-param>

            <param-name>default_encoding</param-name>

            <param-value>UTF-8</param-value>

        </init-param>

        <init-param>

            <param-name>number_format</param-name>

            <param-value>0.##########</param-value>

        </init-param>

    </servlet>

    <servlet-mapping>

        <servlet-name>freemarker</servlet-name>

        <url-pattern>*.ftl</url-pattern>

    </servlet-mapping>

2、新建test.ftl模板文件

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr">

<head>

 <title>test!</title>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>

</head>

<body>

    <div>

        直接显示字符串<br />

        String:${strValue}<br/>

        <hr/>

    </div>  

    <div>

    显示日期

    date:${myDate?date}<br/>

    <hr/>

    显示时间

    time:${myDate?time}<br/>

    <hr/>

    显示时间戳

    datetime:${myDate?datetime}<br/>

    <hr/>

    </div>  

    <div>

    访问对象数组

    ObjectArray:

    ${objectArray[0]},${objectArray[1]},${objectArray[2]}

    <br />

    <hr/>

    </div>  

    <div>

    遍历Set中的元素

    SetData:<br />

    <#list setData as value>

        ${value}

    </#list>

    <hr/>

    </div>  

    <div>

    遍历List中的元素

    strList:<br/>

    <#list strList as strValue >

    <#if strValue_index == >

        ${strValue} is first element

    <#elseif !strValue_has_next>

        ${strValue} is last element

    <#else>

        ${strValue}

    </#if>

    <br />

    </#list>

    <hr/>

    </div>  

    <div>

    获取map中的值

    <br/>

    map:

    key1=${map.key1},key2=${map.key2},key3=${map.key3}

    <hr/>

    </div>  

    <#include "foot.html">

</body>

</html>

foot.html为了演示模板中引入文件的效果

<div style="margin-top: 50px;text-align: center;font-size: 12px">

<hr />

this is foot

</div>

3、编写Servlet，这次的Servlet完全不用涉及到FreeMarker的类库使用，只关心Model即可。

package com.jsoft.testfreemarker;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

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 TestServlet

 */

@WebServlet(name = "test", urlPatterns = "/test")

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * Default constructor.

     */

    public TestServlet() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String strValue = "this is String";

        Date myDate = new Date();

        Object[] objectArray = new Object[] { 1, "str", 1.2 };

        Set<Object> setData = new HashSet<Object>();

        setData.add("dataValue1");

        setData.add("dataValue2");

        setData.add("dataValue3");

        List<String> strList = new ArrayList<String>();

        strList.add("字符串1");

        strList.add("字符串2");

        strList.add("字符串3");

        Map<String, Object> map = new HashMap<String, Object>();

        map.put("key1", "value1");

        map.put("key2", "value2");

        map.put("key3", "value3");

        request.setAttribute("strValue", strValue);

        request.setAttribute("objectArray", objectArray);

        request.setAttribute("strList", strList);

        request.setAttribute("map", map);

        request.setAttribute("myDate", myDate);

        request.setAttribute("setData", setData);

        request.getRequestDispatcher("/WEB-INF/ftl/test.ftl").forward(request, response);

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

     *      response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

4、测试效果

测试工程：https://github.com/easonjim/5_java_example/tree/master/freemarker/test3

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