FreeMarker & Struts2配置及实例
Struts2应用中使用FreeMarker模板技术,只需要在struts.xml文件中进行简单配置即可。
1.要在FreeMarker模板使用标签库,只要四步,如下:
(1)解压struts2-core-X.X.X.jar文件,把在META-INF文件夹下面的struts-tags.tld文件复制到WEB-INF文件夹下。
(2)在web.xml文件中启动JSPSupportServlet.代码如下:
<servlet>
<!--defineaJspSupportServletObject-->
<servlet-name>JspSupportServlet</servlet-name>
<servlet-class>org.apache.struts2.views.JspSupportServlet</servlet-class>
<!--settingJspSupportServletautostart-->
<load-on-startup>1</load-on-startup>
</servlet>
(3)在FreeMarker模板中使用assign指令导入标签库。代码如下
<#assigns=JspTaglibs["/WEB-INF/struts-tags.tld"]/>注:这里我把struts-tags.tld放在WEB-INF下面
(4)现在我们可以在FreeMarker模板中使用标签了,示例代码如下:
<#assigns=JspTaglibs["/WEB-INF/struts-tags.tld"]/>
<@s.formaction="login">
<@s.textfieldname="username"label="username"/>
<@s.submitvalue="login"/>
</@s.form>
2.登录示例:
(1)在WEB-INF文件夹下面建立一个名为ftl的文件夹,其实就是FreeMarker容器,我们把所有的ftl文件都放在里面。
现在我们先在下面建立名字分别为login.ftl,welcome.ftl的文件。
login.ftl代码如下
<#assigns=JspTaglibs["/WEB-INF/struts-tags.tld"]/>
<html>
<head>
<title>LoginForm</title>
</head>
<body>
pleaseinputusernameandpasswordlogin<br>
<@s.formaction="Login.action">
<@s.textfieldname="username"label="username"/>
<@s.passwordname="password"label="password"/>
<@s.submitvalue="submit"/>
</@s.form>
</body>
</html>
welcome.ftl代码如下:
<html>
<head>
<title>Success</title>
</haed>
<body>
WelCome,${username},youlogined!<br>
<ahref="ShowInfo.action">ShowInformation</a>
</body>
</html>
(2)建立Action
packageAction;
importcom.struts2.sunny.SunnyAction;
publicclassLoginActionextendsActionSupport{
privateStringusername;
privateStringpassword;
publicvoidsetPassword(Stringpassword)
{
this.password=password;
}
publicStringgetPassword()
{
returnthis.password;
}
publicvoidsetUsername(Stringusername)
{
this.username=username;
}
publicStringgetUsername()
{
returnthis.username;
}
publicStringexecute()throwsException
{
if(username==null)return"error";
else
returnSUCCESS;
}
}
(3)配置文件struts.xml
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEstrutsPUBLIC"-//ApacheSoftwareFoundation//DTDStrutsConfiguration2.1//EN""http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<packagename="manager"namespace="/manager"extends="struts-default">
<actionname="*">
<resulttype="freemarker">/WEB-INF/ftl/{1}.ftl</result>
</action>
<actionname="Login"class="Action.LoginAction">
<resultname="error"type="freemarker">/WEB-INF/ftl/login.ftl</result>
<resultname="success"type="freemarker">/WEB-INF/ftl/welcome.ftl</result>
</action>
</package>
</struts>
(4)web.xml
<?xmlversion="1.0"encoding="UTF-8"?>
<web-appversion="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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>
<servlet>
<servlet-name>JspSupportServlet</servlet-name>
<servlet-class>org.apache.struts2.views.JspSupportServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
</web-app>