struts2的action中获得request response session

struts2的action中获得request response session

关键字: struts2

在struts2中有两种方式可以得到这些对象

    1、非IoC方式

    要获得上述对象，关键Struts 2中com.opensymphony.xwork2.ActionContext类。我们可以通过它的静态方法getContext()获取当前Action的上下文对象。有了这个对象我们想获得其他几个对象就好办了

ActionContext ctx = ActionContext.getContext();
Map session = ctx.getSession();

ActionContext ctx = ActionContext.getContext(); Map session = ctx.getSession();

    细心的朋友可以发现这里的session是个map对象在Struts2中底层的session都被封装成了Map类型我们可以直接操作这个map 进行对session的写入和读取操作而不用去直接操作HttpSession对象

    另外，org.apache.struts2.ServletActionContext作为辅助类（Helper Class），可以帮助您快捷地获得这几个对象。

      如果你只是想访问session的属性（Attribute），你也可以通过ActionContext.getContext().getSession()获取或添加session范围（Scoped）的对象。

     

2、IoC方式（这种方式在tapestry中也是这样实现的）
    要使用IoC方式，我们首先要告诉IoC容器（Container）想取得某个对象的意愿，通过实现相应的接口做到这点。具体实现。

     publicclass IoCServlet extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {
    private String message;
    private Map att;
    private HttpServletRequest request;
    private HttpServletResponse response;
    public String getMessage() {
        return message;
     }
     publicvoid setSession(Map att) {
        this.att = att;
     }
     publicvoid setServletRequest(HttpServletRequest request) {
        this.request = request;
     }
     publicvoid setServletResponse(HttpServletResponse response) {
        this.response = response;
     }
    @Override
    public String execute() {
         att.put("msg", "Hello World from Session!");
         HttpSession session = request.getSession();
         StringBuffer sb =new StringBuffer("Message from request: ");
         sb.append(request.getParameter("msg"));
         sb.append("Response Buffer Size: ");
         sb.append(response.getBufferSize());
         sb.append("Session ID: ");
         sb.append(session.getId());
         message = sb.toString();
        return SUCCESS;
     }
}

publicclass IoCServlet extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {     private String message;     private Map att;     private HttpServletRequest request;     private HttpServletResponse response;     public String getMessage() {         return message;     }     publicvoid setSession(Map att) {         this.att = att;     }     publicvoid setServletRequest(HttpServletRequest request) {         this.request = request;     }     publicvoid setServletResponse(HttpServletResponse response) {         this.response = response;     }     @Override     public String execute() {         att.put("msg", "Hello World from Session!");         HttpSession session = request.getSession();         StringBuffer sb =new StringBuffer("Message from request: ");         sb.append(request.getParameter("msg"));         sb.append("Response Buffer Size: ");         sb.append(response.getBufferSize());         sb.append("Session ID: ");         sb.append(session.getId());         message = sb.toString();         return SUCCESS;     } }

在struts.xml的action中配置拦截器
    <interceptor-ref name="servletConfig"></interceptor-ref>