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关键字: struts2 httpservletrequest httpsession
在没有使用Struts2之前,都习惯使用HttpServletRequest和HttpSession对象来操作相关参数,下面介绍一下在Struts2中访问隐藏的HttpServletRequest和HttpSession的两种方法:
1.非Ioc方式
这种方式主要是利用了com.opensymphony.xwork2.ActionContext类以及ora.apache.struts2.ServletActionContext类,具体的方法如下所示。
获得request对象:
1).HttpServletRequest request = ServletActionContext.getRequest ();
2).ActionContext ct= ActionContext.getContext();
HttpServletRequest request=
(HttpServletRequest)ct.get(ServletActionContext.HTTP_REQUEST);
获得session对象:
在Struts2中底层的session都被封装成了Map类型,我们称之为SessionMap,而平常我们所说的session则是指HttpSession对象,具体的获得方法如下所示。
1).Map session=ActionContext.getSession();
2).Map session=(Map)ActionContext.getContext().get(ActionContext.SESSION);
得到这个SessionMap之后我们就可以对session进行读写了,如果我们想得到原始的HttpSession可以首先得到HttpServletRequest对象,然后通过request.getSession()来取得原始的HttpSession对象。一般情况下SessionMap已经可以完成所有的工作,我们不必再去强行使用底层的session了。
2.IoC方式
这种方式相对来说变化就比较少了,下面给出代码大家自己看吧:
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport; 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("<br>Response Buffer Size: "); sb.append(response.getBufferSize()); sb.append("<br>Session ID: "); sb.append(session.getId()); message = sb.toString(); return SUCCESS; }
}
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport; 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("<br>Response Buffer Size: "); sb.append(response.getBufferSize()); sb.append("<br>Session ID: "); sb.append(session.getId()); message = sb.toString(); return SUCCESS; }
}