Spring MVC整合FreeMarker的示例

程序员文章站 2022-06-24 15:08:56

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...

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

Spring MVC整合FreeMarker的示例

二.web.xml

<?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 id="viewresolverjsp" 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 id="viewresolverftl" 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 id="freemarkerconfig" 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 id="fmxmlescape" class="freemarker.template.utility.xmlescape"/>
</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。

四.freemarkercontroller.java

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;

@controller
public 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="${resultmap.lastproduct.url}" rel="external nofollow" >${resultmap.lastproduct.name} </a>!
 </body>
</html>

九.运行效果

Spring MVC整合FreeMarker的示例

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

Spring MVC整合FreeMarker的示例

至此,就结束完成整合了!

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相关标签： Spring MVC 整合 FreeMarker

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Spring MVC整合FreeMarker的示例

什么是freemarker?

一.工程结构

二.web.xml

三.springmvc-servlet.xml

四.freemarkercontroller.java

五.jsonutil.java

六.user.java

七.usersinfo.ftl

八.allusers.ftl

九.运行效果

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