基于Java的Spring框架来操作FreeMarker模板的示例

2019-11-26 14:31:39

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1、通过String来创建模版对象，并执行插值处理

import freemarker.template.Template; import java.io.OutputStreamWriter; import java.io.StringReader; import java.util.HashMap; import java.util.Map; /** * Freemarker最简单的例子 * * @author leizhimin 11-11-17 上午10:32 */ public class Test2 {     public static void main(String[] args) throws Exception{         //创建一个模版对象         Template t = new Template(null, new StringReader("用户名：${user};URL：  ${url};姓名： 　${name}"), null);         //创建插值的Map         Map map = new HashMap();         map.put("user", "lavasoft");         map.put("url", "http://www.baidu.com/");         map.put("name", "百度");         //执行插值，并输出到指定的输出流中         t.process(map, new OutputStreamWriter(System.out));     } }

执行后，控制台输出结果：

用户名：lavasoft;URL：  http://www.baidu.com/;姓名： 　百度 Process finished with exit code 0

2、通过文件来创建模版对象，并执行插值操作

import freemarker.template.Configuration; import freemarker.template.Template; import java.io.File; import java.io.OutputStreamWriter; import java.util.HashMap; import java.util.Map; /** * Freemarker最简单的例子 * * @author leizhimin 11-11-14 下午2:44 */ public class Test {     private Configuration cfg;      //模版配置对象     public void init() throws Exception {         //初始化FreeMarker配置         //创建一个Configuration实例         cfg = new Configuration();         //设置FreeMarker的模版文件夹位置         cfg.setDirectoryForTemplateLoading(new File("G://testprojects//freemarkertest//src"));     }     public void process() throws Exception {         //构造填充数据的Map         Map map = new HashMap();         map.put("user", "lavasoft");         map.put("url", "http://www.baidu.com/");         map.put("name", "百度");         //创建模版对象         Template t = cfg.getTemplate("test.ftl");         //在模版上执行插值操作，并输出到制定的输出流中         t.process(map, new OutputStreamWriter(System.out));     }     public static void main(String[] args) throws Exception {         Test hf = new Test();         hf.init();         hf.process();     } }

创建模版文件test.ftl

<html> <head>   <title>Welcome!</title> </head> <body>   <h1>Welcome ${user}!</h1>   <p>Our latest product:   <a href="${url}">${name}</a>! </body> </html>

尊敬的用户你好： 用户名：${user}; URL：  ${url}; 姓名： 　${name}

执行后，控制台输出结果如下：

<html> <head>   <title>Welcome!</title> </head> <body>   <h1>Welcome lavasoft!</h1>   <p>Our latest product:   <a href="http://www.baidu.com/">百度</a>! </body> </html>

尊敬的用户你好：

用户名：lavasoft; URL：  http://www.baidu.com/; 姓名： 　百度 Process finished with exit code 0

3.基于注解的Spring+freemarker实例
web项目图

201632172236408.png (406×557)

web.xml文件

<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  <servlet>   <!-- 配置DispatcherServlet -->   <servlet-name>springmvc</servlet-name>   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>   <!-- 指定spring mvc配置文件位置 不指定使用默认情况 -->    <init-param>       <param-name>contextConfigLocation</param-name>       <param-value>/WEB-INF/springmvc-servlet.xml</param-value>     <!--默认:/WEB-INF/<servlet-name>-servlet.xml     classpath方式:<param-value>classpath:/spring-xml/*.xml</param-value>        -->       </init-param>   <!-- 设置启动顺序 -->   <load-on-startup>1</load-on-startup>  </servlet>  <!-- 配置映射 servlet-name和DispatcherServlet的servlet一致 -->  <servlet-mapping>   <servlet-name>springmvc</servlet-name>   <url-pattern>/</url-pattern><!-- 拦截以/所有请求 -->  </servlet-mapping>  <welcome-file-list>   <welcome-file>index.jsp</welcome-file>  </welcome-file-list> </web-app>

springmvc-servlet.xml文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"   xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"   xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/mvc     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd     http://www.springframework.org/schema/aop     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd     http://www.springframework.org/schema/context     http://www.springframework.org/schema/context/spring-context.xsd">     <!-- 默认注解映射支持 -->    <mvc:annotation-driven/>     <!-- 自动扫描包 -->     <context:component-scan base-package="com.spring.freemarker" />        <!--<context:annotation-config /> 配置自动扫描包配置此配置可省略-->      <!--<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" 配置自动扫描包配置此配置可省略/>-->    <!-- 配置freeMarker的模板路径 -->    <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">     <property name="templateLoaderPath" value="WEB-INF/ftl/" />     <property name="defaultEncoding" value="UTF-8" />    </bean>    <!-- freemarker视图解析器 -->    <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">     <property name="suffix" value=".ftl" />     <property name="contentType" value="text/html;charset=UTF-8" />     <!-- 此变量值为pageContext.request, 页面使用方法：rc.contextPath -->     <property name="requestContextAttribute" value="rc" />    </bean> </beans>

FreeMarkerController类

package com.spring.freemarker;  import java.util.ArrayList; import java.util.List;  import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;  import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView;  import com.spring.vo.User;  @Controller @RequestMapping("/home") public class FreeMarkerController {    @RequestMapping("/index")   public ModelAndView Add(HttpServletRequest request, HttpServletResponse response) {      User user = new User();     user.setUsername("zhangsan");     user.setPassword("1234");     List<User> users = new ArrayList<User>();     users.add(user);     return new ModelAndView("index", "users", users);   }  }

User类

package com.spring.vo;  public class User {    private String username;   private String password;    public String getUsername() {     return username;   }    public void setUsername(String username) {     this.username = username;   }    public String getPassword() {     return password;   }    public void setPassword(String password) {     this.password = password;   }  }

index.ftl文件

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <#list users as user> username : ${user.username}<br/> password : ${user.password} </#list> </body> </html>

部署到tomcat，运行：http://localhost:8080/springmvc/home/index
显示结果：