无法获取servlet请求对象和会话

Question

我试图获取会话数据，但我无法获取它，因为我无法获取请求对象... 代码是...

package secondary.util;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionSupport;




public class GetUserData extends ActionSupport implements ServletRequestAware 
{

private static final long serialVersionUID = 1L;
private HttpServletRequest request;
private HttpSession session;
@Override
public void setServletRequest(HttpServletRequest arg0) {
    this.setServletRequest(arg0);
    session = request.getSession();
}
public HttpServletRequest getRequest() {
    return request;
}
public void setRequest(HttpServletRequest request) {
    this.request = request;
}

public GetUserData()
{

}

public String getUserLocation()
{


    session = request.getSession(); // <- here

String []usr_dtl = session.getAttribute("USERDETAIL").toString().split("@");
System.out.println("User name = " + usr_dtl[6]);
return "DONE";
}

}

当我获取我标记的部分的会话时，它给出 nullpointerException...

Answer 1

session = request.getSession( true );

如果没有当前会话并且 create 为 true，则返回一个新会话。

更新：

您的请求为null，因为您从未在setServletRequest()中设置HttpServletRequest >。

尝试

this.setRequest(arg0);

代替

this.setServletRequest(arg0);