Sending multiple values from servlet to jsp

I have a servlet code where I check for username and password in a helper class and after checking it comes back to servle开发者_开发百科t and lists users. The username along with the list of users must be displayed in the jsp. How to send both the values? Here is the code which I have tried. It displays nothing String outp=t.Welcome(name, pwd);

String Users=t.List_Of_Users();
String User[]=Users.trim().split(" ");
request.setAttribute("name", User);
response.sendRedirect("Welcome_User.jsp?Users="+User+"&outp="+outp);

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response.sendRedirect() will clear the buffer, which apparently means any request attributes previously set will not be retained.

In your case, I believe, its better to use RequestDispatcher.forward(), after setting your desired attributes in request object.

NB:By convention you must define your variable names starting with a small letter. For example, String user;, instead of String User;. Second, the method names should not use underscores. Further, I would suggest self-explanatory names. Below is your snippet with a little renaming.

String userNamesStr =t.userNamesSpaceDelimited();
String[] userNameArr = userNamesStr.trim().split(" "); // Or userNames, but we usually follow this for List

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You can set as many attributes as you want , also optimization should be taken care of. ,

request.setAttribute("key1", Object1);
request.setAttribute("key2", Object2);
request.setAttribute("key3", Object3);
.
.
.
request.setAttribute("keyn", Objectn);

then

String destination = "/WEB-INF/pages/result.jsp";
RequestDispatcher rd = getServletContext().getRequestDispatcher(destination);
rd.forward(request, response);

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• If you use forwarding (request.getRequestDispatcher("welcome_user.jsp").forward()) - just add another request.setAttribute("attrName", value);
• if you retain the redirect - add another get parameter. Welcome_User.jsp?Users="+User+"&outp="+outp + "&another=" + another; (and remove the request.setAttribute(..))

In order to represent an array as string you have multiple options. One of which is Arrays.toString(array)

(Note that sending a password as a get parameter is a security problem.)

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String[] values = getParameterValues(“Input Parameter”);

try this. Read more about this method