struts2獲取域對象

request對象

方法一：在Action中獲取request方法一：   
    HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);

方法二：通過ServletActionContext類來獲取，使用struts2經驗如果處理get傳參是中文，只能使用該方法進行處理亂碼問題
    HttpServletRequest request = ServletActionContext.getRequest();


方法三：通過ServletRequestAware接口通過IOC機制注入Request對象
public class BaseAction implements ServletRequestAware {
     private HttpServletRequest request;
     //實現接口中的方法
     public void setServletRequest(HttpServletRequest request){
      this.request = request;
     }
     //然後在execute()方法中就可以使用了
     public String execute(){
        request.setAttribute("username", "zhangsan");
        request.getSession().getServletContext().getApplication(); //得到Application
     }
}

response對象

方式1：
HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_RESPONSE);

方式2：通過ServletActionContext獲取
    ServletContext servletContext = ServletActionContext.getServletContext();    
    HttpServletResponse response = ServletActionContext.getResponse();

方式3：實現接口    
    public class HelloWorldAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{
    private HttpServletRequest request;
    private ServletContext servletContext;
    private HttpServletResponse response;

    public void setServletRequest(HttpServletRequest req) {
        this.request=req;
    }
    public void setServletResponse(HttpServletResponse res) {
        this.response=res;
    }
    public void setServletContext(ServletContext ser) {
        this.servletContext=ser;
    }
}

session對象

方式1
Map session=ActionContext.getSession();
Map session=(Map)ActionContext.getContext().get(ActionContext.SESSION);

方式2
HttpServletRequest request = ServletActionContext.getRequest();
request.getSession();

方式3
public class UserLoginAction extends ActionSupport implements ServletRequestAware,SessionAware{
    public void setServletRequest(HttpServletRequest request) {
        this.request=request;
    }
    public void setSession(Map session) {
        this.session=session;  
    }
}