Jsp page: 
Copy codeThe Code is as follows: var clientTel = $ ("# clientTel"). val (); 
Var activityId = $ ("# activityId"). val (); 
$. Ajax ({ 
Type: "post", // sending Method 
Url: "/arweb/reserve/saveCode. action", // path 
Data: "clientTel =" + clientTel + "& activityId =" + activityId, 
Success: function (text) {$ ("# randomCode"). val (text );}, 
Error: function (text) {alert ("sorry, the user ID does not exist. Please enter the correct user ID ");} 
}); 
Action class:Copy codeThe Code is as follows: HttpServletResponse res = ServletActionContext. getResponse ();
Res. reset ();
Res. setContentType ("text/html; charset = UTF-8 ");
PrintWriter pw = res. getWriter ();
Pw. print (random );
Pw. flush ();
Pw. close ();
 
Pw. print (random); here the random is the value that action will pass to jsp. In jsp, success: function (text) here the text is the value that receives the data from the action.