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Freemarker common instruction usage examples

高洛峰Original: 2017-01-05 13:53:031447browse

My development environment
Framework: springmvc+freemarker
Development tool: springsource-tool-suite-2.9.0
JDK version: 1.6.0_29
tomcat version: apache-tomcat-7.0 .26

step1. Write the controller file, the code is as follows:

package www.asuan.com.controller;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorldController {
    @RequestMapping("/helloWorld")
    public String helloWorld(Model model) {
        // 示例一
        int flag = 0;
        model.addAttribute("flag", flag);
        // 示例二
        List<String> noExistList = new ArrayList<String>();
        noExistList = null;
        model.addAttribute("noExistList", noExistList);
        // 示例三
        List<String> strList = new ArrayList<String>();
        strList.add("www.");
        strList.add("cnblogs.");
        strList.add("com/sunang");
        model.addAttribute("strList", strList);
        // 示例四
        Map<String, String> strMap = new HashMap<String, String>();
        strMap.put("mapKey0", "www.");
        strMap.put("mapKey1", "cnblogs.");
        strMap.put("mapKey2", "com/sunang");
        model.addAttribute("strMap", strMap);
        // 示例五
        Date nowTime = new Date();
        model.addAttribute("nowTime", nowTime);//传输时间对象
        return "helloWorld.ftl";
    }
}

step2. Write the ftl file, the code is as follows:

<html>
<body>
示例一输出结果：
<p>
<#-- if指令的用法-->
<#-- 在指令标籤内直接使用变量名得到文本值-->
<#if flag == 1>
    flag = 1
<#elseif flag ==2>
    flag = 2
<#else>
    <#-- 在指令标籤外使用   ${变量名}   的格式来得到文本值-->
    flag!=1 && flag!=2 flag的值為：${flag}
</#if>
</p>
<p>----------------------------------------------------------</p>
示例二输出结果：
<p>
<#-- 判断变量是否存在-->
<#if noExistList??>
    List存在
<#else>
    List不存在
</#if>
</p>
<p>----------------------------------------------------------</p>
示例三输出结果：
<p>
<#-- list指令的用法,as可设置别名-->
<#list strList as sl>
    <#-- 在变量名后加   _index   得到变量在容器中的序号，从0开始-->
    <#if sl_index == 0>
        我的博客地址是：${sl}
    <#else>
        ${sl}
    </#if>
</#list>
</p>
<p><p></p>
直接使用下标访问List：${strList[0]}${strList[1]}${strList[2]}
</p>
<p>----------------------------------------------------------</p>
示例四输出结果：
<p>
<#-- 使用    ${变量名.变量名}   获取容器对象的子对象-->
${strMap.mapKey0}${strMap.mapKey1}${strMap.mapKey2}
</p>
<p>----------------------------------------------------------</p>
示例五输出结果：
<p>
<#-- 当变量是日期对象时，可使用函数使其按格式输出-->
${nowTime?string("yyyy-MM-dd")}
</p>
</body>
</html>

step3. Run and debug

Deploy the project to tomcat and run it, enter in the browser: http://localhost:8080/the project name you set/helloWorld.htm
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