freemark的例子操作-优快云博客

本文介绍了一个使用Freemarker模板引擎与Struts框架集成的具体示例。通过配置struts.xml文件，实现了一个简单的登录功能，包括登录表单、成功与错误页面的展示。示例详细展示了如何配置Web应用、定义Action类以及整合视图层。

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对freemark理解与例子

首先将 struts-tags.tld 放在WEB-INF 目录下

1.login.ftl

<#assign s = JspTaglibs["/WEB-INF/struts-tags.tld"]/>
<html>
<head>
    <title>Login Form</title>
</head>

<body>
    pelease input username and password login<br>
    <@s.form action="Login">
       <@s.textfield name="username"  label="username"/>
       <@s.password name="password" label="password"/>
       <@s.submit value="提交"/>
    </@s.form>
</body>   
</html>

2.success.ftl

<#assign s = JspTaglibs["/WEB-INF/struts-tags.tld"]/>
<html>
<head>
    <title>SUCCESS</title>
</head>

<body>
     欢迎${username}登陆！
</body>   
</html>

3.error.ftl

<#assign s = JspTaglibs["/WEB-INF/struts-tags.tld"]/>
<html>
<head>
    <title>ERROR</title>
</head>

<body>
    ${error}
</body>   
</html>

4.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">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
     <servlet-name>JspSupportServlet</servlet-name>
     <servlet-class>org.apache.struts2.views.JspSupportServlet</servlet-class>
     <load-on-startup>1</load-on-startup>
  </servlet>
  
  <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  
  <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

5.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
  
   <constant name="struts.devMode" value="true"></constant>
   <include file="struts-default.xml"></include>
   <package name="struts"  extends="struts-default" namespace="/">
      
      <action name="Login" class="com.yihaodian.action.LoginAction">
         <result name="error" type="freemarker">/WEB-INF/ftl/error.ftl</result>
         <result name="success" type="freemarker">/WEB-INF/ftl/success.ftl </result>
      </action>
 <!-- *是通配符的意思 在url中输入的login.action 即可访问到login.ftl 登陆页面 -->     
       <action name="*">
            <result type="freemarker">/WEB-INF/ftl/{1}.ftl</result>
        </action>
   </package>
</struts>

6.action

package com.yihaodian.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

	private static final long serialVersionUID = 1L;
	private String username;
	private String password;
    private String error;
	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;
	}
	public String getError() {
		return error;
	}
	public void setError(String error) {
		this.error = error;
	}
	
	public String execute(){
		if(getUsername().equals("zhaoyun")&&getPassword().equals("123")){
			return "success";
		}else{
			setError("登陆失败！");
			return "error";
		}
	}
    
}

7.访问

http://localhost:8080/FreeMarkDemo/Login