Spring MVC整合FreeMarker的示例

FreeMarker是一个用Java语言编写的模板引擎，它基于模板来生成文本输出。FreeMarker与Web容器无关，即在Web运行时，它并不知道Servlet或HTTP。它不仅可以用作表现层的实现技术，而且还可以用于生成XML，JSP或Java 等。 目前企业中:主要用Freemarker做静态页面或是页面展示

<?xml version='1.0' encoding='UTF-8'?><web-app 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'> <display-name>SpringMVC</display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/springMVC-servlet.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app>三.springMVC-servlet.xml

<?xml version='1.0' encoding='UTF-8'?><beans xmlns='http://www.springframework.org/schema/beans' xmlns:context='http://www.springframework.org/schema/context' xmlns:p='http://www.springframework.org/schema/p' xmlns:mvc='http://www.springframework.org/schema/mvc' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd '> <!-- 自动扫描包 --> <context:component-scan base-package='com.bijian.study.controller'></context:component-scan> <!-- 默认注解映射支持 --> <mvc:annotation-driven></mvc:annotation-driven> <!--JSP视图解析器--> <bean class='org.springframework.web.servlet.view.InternalResourceViewResolver'> <property name='prefix' value='/WEB-INF/views/'/> <property name='suffix' value='.jsp'/> <property name='viewClass' value='org.springframework.web.servlet.view.InternalResourceView'/> <property name='order' value='1'/> </bean> <!-- 配置freeMarker视图解析器 --> <bean class='org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver'> <property name='viewClass' value='org.springframework.web.servlet.view.freemarker.FreeMarkerView'/> <property name='contentType' value='text/html; charset=UTF-8'/> <property name='exposeRequestAttributes' value='true' /> <property name='exposeSessionAttributes' value='true' /> <property name='exposeSpringMacroHelpers' value='true' /> <property name='cache' value='true' /> <property name='suffix' value='.ftl' /> <property name='order' value='0'/> </bean> <!-- 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='freemarkerVariables'> <map><entry key='xml_escape' value-ref='fmXmlEscape' /> </map> </property> <property name='defaultEncoding' value='UTF-8'/> <property name='freemarkerSettings'> <props><prop key='template_update_delay'>3600</prop><prop key='locale'>zh_CN</prop><prop key='datetime_format'>yyyy-MM-dd HH:mm:ss</prop><prop key='date_format'>yyyy-MM-dd</prop><prop key='number_format'>#.##</prop> </props> </property> </bean> <bean /></beans>

在JSP和Freemarker的配置项中都有一个order property，上面例子是把freemarker的order设置为0，jsp为1，意思是找view时，先找ftl文件，再找jsp文件做为视图。这样Freemarker视图解析器就能与JSP视图解析器并存。

package com.bijian.study.controller;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;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.alibaba.fastjson.JSON;import com.bijian.study.utils.JsonUtil;import com.bijian.study.vo.User;@Controllerpublic class FreeMarkerController { @RequestMapping('/get/usersInfo') public ModelAndView Add(HttpServletRequest request, HttpServletResponse response) { User user = new User(); user.setUsername('zhangsan'); user.setPassword('1234'); User user2 = new User(); user2.setUsername('lisi'); user2.setPassword('123'); List<User> users = new ArrayList<User>(); users.add(user); users.add(user2); return new ModelAndView('usersInfo', 'users', users); } @RequestMapping('/get/allUsers') public ModelAndView test(HttpServletRequest request, HttpServletResponse response) { List<User> users = new ArrayList<User>(); User u1 = new User(); u1.setUsername('王五'); u1.setPassword('123'); users.add(u1); User u2 = new User(); u2.setUsername('张三'); u2.setPassword('2345'); users.add(u2); User u3 = new User(); u3.setPassword('fgh'); u3.setUsername('李四'); users.add(u3); Map<String, Object> rootMap = new HashMap<String, Object>(); rootMap.put('userList', users); Map<String, String> product = new HashMap<String, String>(); rootMap.put('lastProduct', product); product.put('url', 'http://www.baidu.com'); product.put('name', 'green hose'); String result = JSON.toJSONString(rootMap); Map<String, Object> resultMap = new HashMap<String, Object>(); resultMap = JsonUtil.getMapFromJson(result); return new ModelAndView('allUsers', 'resultMap', resultMap); }}五.JsonUtil.java

package com.bijian.study.utils;import java.util.Map;import com.alibaba.fastjson.JSON;public class JsonUtil { public static Map<String, Object> getMapFromJson(String jsonString) { if (checkStringIsEmpty(jsonString)) { return null; } return JSON.parseObject(jsonString); } /** * 检查字符串是否为空 * @param str * @return */ private static boolean checkStringIsEmpty(String str) { if (str == null || str.trim().equals('') || str.equalsIgnoreCase('null')) { return true; } return false; }}六.User.java

ackage com.bijian.study.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; }}七.usersInfo.ftl

<!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>usersInfo</title></head><body><#list users as user> <div> username : ${user.username}, password : ${user.password} </div></#list></body></html>八.allUsers.ftl

<html> <head> <title>allUsers</title> </head> <body> <#list resultMap.userList as user> Welcome ${user.username}! id:${user.password}<br/> </#list> <p>Our latest product: <a href='https://www.haobala.com/bcjs/${resultMap.lastProduct.url}' rel='external nofollow' >${resultMap.lastProduct.name} </a>! </body></html>九.运行效果

再输入http://localhost:8088/SpringMVC/greeting?name=zhangshan，JSP视图解析器运行依然正常。

至此,就结束完成整合了!

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