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Servlet + Freemarker 入门练习

ServletfreemarkerWebXHTMLHTML 
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建立web项目，拷贝freemarker的jar文件到类路径，其他步骤略。

首先配置web.xml，添加freemarker解析的Servlet配置，内容如下

  
  <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>

 

 

添加一个测试用的Servlet，代码如下：

package test.servlet;

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.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestFreemarker extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			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");
		
		req.setAttribute("strValue", strValue);
		req.setAttribute("objectArray", objectArray);
		req.setAttribute("strList", strList);
		req.setAttribute("map", map);
		req.setAttribute("myDate", myDate);
		req.setAttribute("setData", setData);
		req.getRequestDispatcher("/WEB-INF/view/freemarker/test.ftl").forward(req, resp);
	}
}

 

配置此Servlet到web.xml中，增加如下内容到web.xml文件中：

  <servlet>
  	<servlet-name>test</servlet-name>
  	<servlet-class>test.servlet.TestFreemarker</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>test</servlet-name>
  	<url-pattern>/test</url-pattern>
  </servlet-mapping>

 

在/WEB-INF/view/freemarker目录下建立文件test.ftl，内容如下：

<!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 == 0>
		${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>

 

模板中包含的foot.html，在和test.ftl相同的目录下，文件内容如下

<div style="margin-top: 50px;text-align: center;font-size: 12px">
<hr />
this is foot
</div>

 

运行此项目访问/test路径，输出内容如下：

<!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:this is String<br/>	
		<hr/>

	</div>
	
	<div>
	显示日期
	date:2011-3-18<br/>
	<hr/>
	显示时间
	time:17:21:44<br/>
	<hr/>
	显示时间戳
	datetime:2011-3-18 17:21:44<br/>

	<hr/>	
	</div>
	
	<div>
	访问对象数组
	ObjectArray:
	1,str,1.2
	<br />
	<hr/>		
	</div>
	
	<div>
	遍历Set中的元素
	SetData:<br />
		dataValue2
		dataValue1
		dataValue3
	<hr/>	
	</div>

	
	<div>
	遍历List中的元素
	strList:<br/>
		字符串1 is first element
	<br />
		字符串2
	<br />
		字符串3 is last element
	<br />
	<hr/>	
	</div>

	
	<div>
	获取map中的值
	<br/>
	map:
	key1=value1,key2=value2,key3=value3
	<hr/>		
	</div>
	
	
<div style="margin-top: 50px;text-align: center;font-size: 12px">
<hr />
this is foot
</div></body>   
</html>

 

 

freemarker的list指令，不能遍历如Object[]类型的对象数组。但可以遍历List和Set

，

 

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| 安装freemarker插件到eclipse中
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