Spring MVC controller Jump redirect pass-through parameter

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1. Requirements Background requirements: Spring MVC Framework controller jumps between, need to redirect. There are several situations: without parameter jump, with the parameter splicing URL form jump, with parameters do not join parameters jump, the page can also be displayed. I thought it was a simple thing, and personally think that the more commonly used one way, 100 degrees all have, these are not problems, but 100 degrees unexpectedly to my surprise, a bunch of not I want results. Helpless Ah, write a comparison of their own all for the later 100 degrees, ha haha ... It's not all that's written. People have given me the impetus to write this blog.    2. The solution needs to have a definite solution, one after the other, explaining that spring's jump way a lot of, I just say some self-think good, common, spring-loaded some classes and methods. (1) I have a controller in the background to jump to another controller, why there is such a requirement, is the case.        I have a list page, and then I will do a new operation, added in the background after the completion of I want to jump to the list page, do not need to pass parameters, List page default query all. Mode one: Use Modelandview

return new Modelandview ("Redirect:/tolist"); This way you can redirect to ToList

.

        Method II: Return string                     return "redirect:/toList ";          Other ways: There are many other ways, there is no introduction, such as response and so on. This is a redirect without parameters.      (2) The second situation, the list page has the query condition, after the jump my query condition cannot throw away, thus needs with the parameter, with the parameter can splice url        Way One: Manually stitching url                yourself      new Modelandview ("Redirect:/tolist? param1= "+value1+" &param2= "+value2);                     There is a drawback, that is, the Chinese language may have garbled problems.         Way two: With Redirectattributes, this is found to be a more useful class                      Here with its AddAttribute method, This actually redirects the past after you look at the URL, is it automatically spell your URL for you.                     How to use:                       attr.addattribute ("param", value);                     return "Redirect:/namespace/tocontroller";                     This parameter can be obtained by obtaining a parameter in the Tocontroller method, Passed to the page again. The URL of the past is still the same as the way.      (3) with parameter not stitching URL page can also get value (focus on this)             Generally I guess redirect to all want to:             in this way @RequestMapping ("/ Save ")

    Public String Save (@ModelAttribute ("form") Bean form,redirectattributes attr)     &N Bsp              throws Exception { 

        String code =  service.save (form);        if (code.equal S ("")) {            Attr.addflashattribute ("name", Form.getname ());              Attr.addflashattribute ("Success", "Add success!");             return "Redirect:/index";       }else{            Attr.addattribute ("ProjectName", Form.getprojectname ());              Attr.addattribute ("enviroment", Form.getenviroment ());              Attr.addflashattribute ("MSG", "Add Error!" error code is: "+rsp.getcode (). GetCode () +", The error is: "+rsp.getcode (). GetName ());            return" redirect:/maintenance/ Toaddconfigcenter ";       }   } 

@RequestMapping ("/index")

Public

String Save (@ModelAttribute ("form") Bean form,redirectattributes attr) throws Exce    ption {

return "Redirect:/main/list";

the page value is not used I said, directly with the EL expression can be obtained, the principle here is placed in the session, the session will jump to the page immediately after removing the object. So when you refresh, the value will be lost.

3. Summarize the bottom or two kinds of jumps, just spring has been encapsulated, so there are many different ways to jump, you can also seal one, you can use the most primitive response, there is no problem.    All right, here we go. In fact, there is nothing, but know this is very simple, did not understand before, now understand, and everyone to share. Give me a message if you have any questions.