在MVC模式的view层中,jsp中的form表单中元素如input等,都使用OGNL的表达式作为name的值。而在form提交时,这些值都会被设置到Action中的java对象中。而当Action转向到JSP时,struts2的Tag又可以从Action的java对象中,通过OGNL进行取值。
<form method="post" action="/struts-example/ognl.action">
user name: <input type="text" name="user.name" value="downpour" />
department name: <input type="text" name="department.name" value="dev" />
<input type="submit" value="submit" />
</form>
public class OgnlAction extends ActionSupport {
private static final Log logger = LogFactory.getLog(OgnlAction.class);
private User user;
private Department department;
/* (non-Javadoc)
* @see com.opensymphony.xwork2.ActionSupport#execute()
*/
@Override
public String execute() throws Exception {
logger.info("user name:" + user.getName()); // -> downpour
logger.info("department name:" + department.getName()); // -> dev
return super.execute();
}
// setter and getters
}
user name: <s:property value="user.name" />
department name: <s:property value="department.name" />