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什么是Freemarker?
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 一.工程结构 二.web.xml [url=]![]() [/url]
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 5 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 6 7 <display-name>SpringMVC</display-name> 8 9 <context-param> 10 <param-name>contextConfigLocation</param-name> 11 <param-value>/WEB-INF/springMVC-servlet.xml</param-value> 12 </context-param> 13 14 <listener> 15 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 16 </listener> 17 18 <filter> 19 <filter-name>encodingFilter</filter-name> 20 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 21 <init-param> 22 <param-name>encoding</param-name> 23 <param-value>UTF-8</param-value> 24 </init-param> 25 <init-param> 26 <param-name>forceEncoding</param-name> 27 <param-value>true</param-value> 28 </init-param> 29 </filter> 30 <filter-mapping> 31 <filter-name>encodingFilter</filter-name> 32 <url-pattern>/*</url-pattern> 33 </filter-mapping> 34 35 <servlet> 36 <servlet-name>springMVC</servlet-name> 37 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 38 <load-on-startup>1</load-on-startup> 39 </servlet> 40 <servlet-mapping> 41 <servlet-name>springMVC</servlet-name> 42 <url-pattern>/</url-pattern> 43 </servlet-mapping> 44 </web-app> [url=]![]() [/url]
三.springMVC-servlet.xml [url=]![]() [/url]
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" 4 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/s ... ing-context-3.0.xsd 9 http://www.springframework.org/schema/mvc 10 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 11 "> 12 <!-- 自动扫描包 --> 13 <context:component-scan base-package="com.bijian.study.controller"></context:component-scan> 14 15 <!-- 默认注解映射支持 --> 16 <mvc:annotation-driven></mvc:annotation-driven> 17 18 <!--JSP视图解析器--> 19 <bean id="viewResolverJsp" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 20 <property name="prefix" value="/WEB-INF/views/"/> 21 <property name="suffix" value=".jsp"/> 22 <property name="viewClass" value="org.springframework.web.servlet.view.InternalResourceView"/> 23 <property name="order" value="1"/> 24 </bean> 25 26 <!-- 配置freeMarker视图解析器 --> 27 <bean id="viewResolverFtl" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> 28 <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView"/> 29 <property name="contentType" value="text/html; charset=UTF-8"/> 30 <property name="exposeRequestAttributes" value="true" /> 31 <property name="exposeSessionAttributes" value="true" /> 32 <property name="exposeSpringMacroHelpers" value="true" /> 33 <property name="cache" value="true" /> 34 <property name="suffix" value=".ftl" /> 35 <property name="order" value="0"/> 36 </bean> 37 38 <!-- 配置freeMarker的模板路径 --> 39 <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> 40 <property name="templateLoaderPath" value="/WEB-INF/ftl/"/> 41 <property name="freemarkerVariables"> 42 <map> 43 <entry key="xml_escape" value-ref="fmXmlEscape" /> 44 </map> 45 </property> 46 <property name="defaultEncoding" value="UTF-8"/> 47 <property name="freemarkerSettings"> 48 <props> 49 <prop key="template_update_delay">3600</prop> 50 <prop key="locale">zh_CN</prop> 51 <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop> 52 <prop key="date_format">yyyy-MM-dd</prop> 53 <prop key="number_format">#.##</prop> 54 </props> 55 </property> 56 </bean> 57 58 <bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape"/> 59 </beans> [url=]![]() [/url]
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。
四.FreeMarkerController.java [url=]![]() [/url]
1 package com.bijian.study.controller; 2 3 import java.util.ArrayList; 4 import java.util.HashMap; 5 import java.util.List; 6 import java.util.Map; 7 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 11 import org.springframework.stereotype.Controller; 12 import org.springframework.web.bind.annotation.RequestMapping; 13 import org.springframework.web.servlet.ModelAndView; 14 15 import com.alibaba.fastjson.JSON; 16 import com.bijian.study.utils.JsonUtil; 17 import com.bijian.study.vo.User; 18 19 @Controller 20 public class FreeMarkerController { 21 22 @RequestMapping("/get/usersInfo") 23 public ModelAndView Add(HttpServletRequest request, HttpServletResponse response) { 24 25 User user = new User(); 26 user.setUsername("zhangsan"); 27 user.setPassword("1234"); 28 29 User user2 = new User(); 30 user2.setUsername("lisi"); 31 user2.setPassword("123"); 32 33 List<User> users = new ArrayList<User>(); 34 users.add(user); 35 users.add(user2); 36 return new ModelAndView("usersInfo", "users", users); 37 } 38 39 @RequestMapping("/get/allUsers") 40 public ModelAndView test(HttpServletRequest request, HttpServletResponse response) { 41 42 List<User> users = new ArrayList<User>(); 43 User u1 = new User(); 44 u1.setUsername("王五"); 45 u1.setPassword("123"); 46 users.add(u1); 47 48 User u2 = new User(); 49 u2.setUsername("张三"); 50 u2.setPassword("2345"); 51 users.add(u2); 52 53 User u3 = new User(); 54 u3.setPassword("fgh"); 55 u3.setUsername("李四"); 56 users.add(u3); 57 58 Map<String, Object> rootMap = new HashMap<String, Object>(); 59 rootMap.put("userList", users); 60 Map<String, String> product = new HashMap<String, String>(); 61 rootMap.put("lastProduct", product); 62 product.put("url", "http://www.baidu.com"); 63 product.put("name", "green hose"); 64 65 String result = JSON.toJSONString(rootMap); 66 67 Map<String, Object> resultMap = new HashMap<String, Object>(); 68 resultMap = JsonUtil.getMapFromJson(result); 69 70 return new ModelAndView("allUsers", "resultMap", resultMap); 71 } 72 } [url=]![]() [/url]
五.JsonUtil.java [url=]![]() [/url]
1 package com.bijian.study.utils; 2 3 import java.util.Map; 4 5 import com.alibaba.fastjson.JSON; 6 7 public class JsonUtil { 8 9 public static Map<String, Object> getMapFromJson(String jsonString) { 10 if (checkStringIsEmpty(jsonString)) { 11 return null; 12 } 13 return JSON.parseObject(jsonString); 14 } 15 16 /** 17 * 检查字符串是否为空 18 * @param str 19 * @return 20 */ 21 private static boolean checkStringIsEmpty(String str) { 22 if (str == null || str.trim().equals("") || str.equalsIgnoreCase("null")) { 23 return true; 24 } 25 return false; 26 } 27 } [url=]![]() [/url]
六.User.java [url=]![]() [/url]
1 ackage com.bijian.study.vo; 2 3 public class User { 4 5 private String username; 6 private String password; 7 8 public String getUsername() { 9 return username; 10 } 11 12 public void setUsername(String username) { 13 this.username = username; 14 } 15 16 public String getPassword() { 17 return password; 18 } 19 20 public void setPassword(String password) { 21 this.password = password; 22 } 23 } [url=]![]() [/url]
七.usersInfo.ftl [url=]![]() [/url]
1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5 <title>usersInfo</title> 6 </head> 7 <body> 8 <#list users as user> 9 <div> 10 username : ${user.username}, 11 password : ${user.password} 12 </div> 13 </#list> 14 </body> 15 </html> [url=]![]() [/url]
八.allUsers.ftl [url=]![]() [/url]
1 <html> 2 <head> 3 <title>allUsers</title> 4 </head> 5 <body> 6 <#list resultMap.userList as user> 7 Welcome ${user.username}! id:${user.password}<br/> 8 </#list> 9 <p>Our latest product: 10 <a href="${resultMap.lastProduct.url}">${resultMap.lastProduct.name} </a>! 11 </body> 12 </html> [url=]![]() [/url]
九.运行效果 至此,就结束完成整合了!
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