FreeMarker使用实例

所需Jar包：

freemarker.jar

本例使用了struts2

commons-logging.jar

ognlXXX.jar

struts2-coreXXX.jar

xwork.jar

这是struts2必须的Jar包。

在web.xml中加入struts2过滤器，拦截请求。

<filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

struts.xml配置：

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="user" extends="struts-default" namespace="/user">
       <action name="login" class="com.freemarker.test.LoginAction">
         <result type="redirect">/${flag}</result>
       </action>
    </package>
</struts>

 

JAVA类：

StaticFreeMarker.java

package com.freemarker.test;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Locale;
import java.util.Map;

import org.apache.struts2.ServletActionContext;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

public class StaticFreemarker {
 
 @SuppressWarnings("unchecked")
 public void init(String ftl,Map map,String htmlName,String fileName) throws IOException, TemplateException {
  Configuration cfg = new Configuration();
  cfg.setEncoding(Locale.getDefault(), "gbk");
  cfg.setServletContextForTemplateLoading(ServletActionContext.getServletContext(), "/" + fileName);
  
  Template template = cfg.getTemplate(ftl);
  template.setEncoding("gbk");
  
  String path = ServletActionContext.getServletContext().getRealPath("/");
  File file = new File(path + htmlName);
  Writer  out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file),"gbk"));
  template.process(map, out);
  out.flush();
  out.close();
 }
}


User.java

package com.freemarker.test;

import java.io.Serializable;

public class User implements Serializable{

 /**
  * 
  */
 private static final long serialVersionUID = 1L;
 
 private Integer id;
 private String name;
 private String password;
 public Integer getId() {
  return id;
 }
 public void setId(Integer id) {
  this.id = id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
}


LoginAction.java

package com.freemarker.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;
import com.sun.org.apache.bcel.internal.generic.ARRAYLENGTH;

import freemarker.template.TemplateException;

public class LoginAction extends ActionSupport {

 /**
  * 
  */
 private static final long serialVersionUID = 1L;

 // 跳转标识
 private String flag;
 
 private User user;

 public String getFlag() {
  return flag;
 }

 public void setFlag(String flag) {
  this.flag = flag;
 }
 
 public User getUser() {
  return user;
 }

 public void setUser(User user) {
  this.user = user;
 }

 @Override
 public String execute() {
  if (user == null) {
   this.flag = "login.jsp";
  }
  else {
   StaticFreemarker sf = new StaticFreemarker();
   Map map = new HashMap();
   String htmlName = "success.html";
   
   // 1.添加对象
   map.put("user", this.user);
   List<User> userList = new ArrayList<User>();
   User user1 = new User();
   user1.setId(100);
   user1.setName("scott");
   user1.setPassword("tiger");
   
   User user2 = new User();
   user2.setId(200);
   user2.setName("root");
   user2.setPassword("123");

   userList.add(user1);
   userList.add(user2);
   
   // 添加集合
   map.put("userList", userList);
   
   // 添加bool值
   map.put("isTrue", true);
   try {
    sf.init("test.ftl", map, htmlName, "demo");
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (TemplateException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   this.flag = htmlName; // 决定要跳转到哪个页面
  }
  return SUCCESS;
 }
}


在webContent下有demo目录，其中有login.jsp和test.ftl文件。

login.jsp

<%@ page language="java" contentType="text/html;"
    pageEncoding="utf-8"%>
    <%@ taglib uri="/struts-tags" prefix="s"%>
<!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>用户登录</title>
</head>
<body>
 <s:form action="/user/login.action">
  <table>
   <tr>
    <td>用户名</td>
    <td><input type="text" name="user.name"/></td>
   </tr>
   <tr>
    <td>密码</td>
    <td><input type="text" name="user.password"/></td>
   </tr>
   <tr align="center">
    <td colspan="2">
     <input type="submit" value="登录"/>
    </td>
   </tr>
  </table> 
 </s:form>
</body>
</html>

 

test.ftl:

<html>
 <body>
   您好，您已成功登录系统！<br>
   以下是您的登录信息：<br>
   用户名：${user.name}<br>
   密码：${user.password}<br><br>
   
   <span>以下为测试信息：<span><br>
   <#list userList as user>
    Id:${user.id}<br>
    Name:${user.name}<br>
    Pwd:${user.password}<br><br>
   </#list>
   
   <hr>
   Boolean:<br>
   <#if isTrue>
       isTrue = true;
   </#if>
 </body>
</html>