struts2中访问servlet API的一些方法

在Acion中我们通常需要访问servlet的一些API，如request、session、application等。此时我们该怎么办呢？

方法1：使用ServletActionContext或ActionContext类。

//使用ServletActionContext
HttpServletRequest request = ServletActionContext.getRequest();
HttpSession session = ServletActionContext.getRequest().getSession();
ServletContext application = ServletActionContext.getServletContext();

//---------------------------------------------------------------------------------
//使用ActionContext
Map<String, Object> session = ActionContext.getContext().getSession();
Map<String, Object> application = ActionContext.getContext.getApplication();

Map<String, Object> request = (Map<String, Object>)ActionContext.getContext().get("request");

Map<String, Object> session = (Map<String, Object>)ActionContext.getContext().get("session");

Map<String, Object> application = (Map<String, Object>)ActionContext.getContext().get("application");

 

方法2：使Action继承RequestAware、SessionAware、ApplicationAware三个接口（根据具体需要继承其中的某一个或某几个接口）。

public class ServletApiAction extends ActionSupport implements RequestAware, SessionAware, ApplicationAware
{
 	private Map<String, Object> request;
 	private Map<String, Object> session;
 	private Map<String, Object> application;
 
 	@Override
 	public String execute() throws Exception
 	{
    		return SUCCESS;
 	} 	@Override
	public void setApplication(Map<String, Object> arg0)
 	{
  		this.application = arg0;
 	} 	@Override
 	public void setSession(Map<String, Object> arg0)
 	{
  		this.session = arg0;
 	} 	@Override
 	public void setRequest(Map<String, Object> arg0)
 	{
  		this.request = arg0;
 	}
}