struts2 中怎样获取HttpServletReqest

struts2 中怎样获取HttpServletRequest 和HttpServletResponse

提供两种方法

第一种通过调用ServletActionContext这个类源代码中提供这个对象。

  */
    public static void setRequest(HttpServletRequest request) {
        ActionContext.getContext().put(HTTP_REQUEST, request);
    }

    /**
     * Gets the HTTP servlet request object.
     *
     * @return the HTTP servlet request object.
     */
    public static HttpServletRequest getRequest() {
        return (HttpServletRequest) ActionContext.getContext().get(HTTP_REQUEST);
    }

    /**
     * Sets the HTTP servlet response object.
     *
     * @param response the HTTP servlet response object.
     */
    public static void setResponse(HttpServletResponse response) {
        ActionContext.getContext().put(HTTP_RESPONSE, response);
    }

    /**
     * Gets the HTTP servlet response object.
     *
     * @return the HTTP servlet response object.
     */
    public static HttpServletResponse getResponse() {
        return (HttpServletResponse) ActionContext.getContext().get(HTTP_RESPONSE);
    }

    /**
     * Gets the servlet context.
     *
     * @return the servlet context.
     */
    public static ServletContext getServletContext() {
        return (ServletContext) ActionContext.getContext().get(SERVLET_CONTEXT);
    }

调用方法

ServletActionContext.getPageContext();

ServletActionContext.getRequest();
ServletActionContext.getResponse();
ServletActionContext.getContext();

第二种方法：通过实现ServletRequestAware接口 来实现

代码如

public class Demo2Action extends ActionSupport implements ServletRequestAware{
    private HttpServletRequest request;

    public String execute(){
        System.out.print(request);
        return NONE;

    }

    //调用动作方法前  框架先会调用此方法 将request对象注入进来
    public void setServletRequest(HttpServletRequest request) {

        this.request=request;
    }

}

这样也能够实现得到HttpServletRequest