Struts2 method to get the parameters of JSP page __js

Instance: Now the JSP page passes a parameter named username to the action

Url:http://localhost:8080/studentsystem/role_list.action?username=qk12333.com

first, the Get Set method is used to obtain

Define a variable with the same name in the corresponding action class and generate a set get method, then the parameter will automatically fetch the value

String username;

Public String GetUserName ()
{
return username;
}

public void Setusername (String username)
{
This.username = Username;
}

SYSTEM.OUT.PRINTLN (username)//result is qk12333.com

second, through Servletactioncontext get/import imports Org.apache.struts2.ServletActionContext;

HttpServletRequest reqeust= servletactioncontext.getrequest ();

String Username=reqeust.getparameter ("username");//Strings

Url:http://localhost:8080/studentsystem/role_list.action?username=qk12333.com&username=qk12333.com

String[] Username=reqeust.getparametervalues ("username");//Array of strings

SYSTEM.OUT.PRINTLN (username)//result is qk12333.com System.out.println (username[0));//result is qk12333.com

third, through Actioncontext get/import imports Com.opensymphony.xwork2.ActionContext;

Actioncontext context = Actioncontext.getcontext ();
Map params = Context.getparameters ();
String[] Username= (string[]) params.get ("username");

Actioncontext gets to an object such as objects or string[] System.out.println (username[0);//The result is qk12333.com