Sending parameters from JSP to spring controller

Question

I am developing a web app using spring MVC. I am passing the parameters from JSP to spring controller in the below format. Like I have to pass two parameters so I am doing

<a href="/spring.html?data1=<%=data1 %>?data2=<%=data2 %>"> Hello </a>

My assumption is that in the spring controller, I can receive the output as the following

data1= request.getAttribute("data1");
data2= request.getAttribute("data2");

Is this the correct way to pass the parameters . I have dry run my code many times still my pages gives null pointer so I doubt whether it is because of this . Could you ppl please let me know about this. Thank you.

Community · Accepted Answer · 2017-05-23 12:15:41Z

3

There are at least 2 technical mistakes:

You should get request parameters as request parameters, not as request attributes.
```
data1 = request.getParameter("data1");
data2 = request.getParameter("data2");
```
The request parameter separator is &, not ?. The ? is the request query string separator.
```
<a href="/spring.html?data1=<%=data1 %>&data2=<%=data2 %>"> Hello </a>
```

There's by the way a third mistake, but that's more a design matter. Scriptlets are discouraged since a decade.

edited May 23, 2017 at 12:15

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answered Aug 3, 2012 at 4:50

BalusC

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3 Comments

user1562262 Over a year ago

In this how can we pass objects, the problem is I am not able to type case when using request.getParameter

user1562262 Over a year ago

If data 1 and data 2 are objects then how can I type cast in my controller

BalusC Over a year ago

You're making a conceptual mistake. HTML code cannot contain Java objects, but only a sequence of characters. A sequence of characters is in Java represented by a String. So you need to convert them to String and vice versa. Or you could just store them somewhere (database, session, etc) and pass some unique identifier.

Jakub Kubrynski · Accepted Answer · 2014-01-13 21:53:02Z

0

If it is Spring MVC controller then your don't need to do call request.getParameter. You can just define your method like this and arguments will be auto-populated by MVC framework:

@RequestMapping(value="/myRequest", method=RequestMethod.GET)
@ResponseBody
public String handleMyRequest(
        @RequestParam String data1,
        @RequestParam String data2
        ) {
   // your handler code here
   // you will have data1 and data2 automatically populated by Spring MVC
}

edited Jan 13, 2014 at 21:53

Jakub Kubrynski

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answered Aug 3, 2012 at 4:58

anubhava

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2 Comments

user1562262 Over a year ago

Could you please share the corresponding jsp as how to pass an object from there to here. Thank you.

anubhava Over a year ago

Your JSP can just have a simple link like: <a href="/spring.html?data1=<%=data1 %>&data2=<%=data2 %>"> Hello </a> I suggest reading a little bit about Spring MVC tutorial

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