How to get request parameters in Spring3 MVC

This article is about how to get the request parameters in Spring3 MVC. The editor thinks it is very practical, so I hope you can get something after reading this article. Let's take a look at it with the editor.

Get the parameters in the path through @ PathVariabl

@ RequestMapping (value= "user/ {id} / {name}", method=RequestMethod.GET) public String printMessage1 (@ PathVariable String id,@PathVariable String name, ModelMap model) {System.out.println (id); System.out.println (name); model.addAttribute ("message", "111111"); return "users";}

For example, when accessing the user/123/lei path, execute the above method, where the parameter id=123,name=lei

@ ModelAttribute gets the FORM form data of the POST request

Java Pojo is as follows

Public class Pojo {private String a; private int b;}

Java Controller is as follows

@ RequestMapping (method = RequestMethod.POST) public String processSubmit (@ ModelAttribute ("pojo") Pojo pojo) {return "helloWorld";}

@ RequestBody gets the FORM form data of the POST request

@ RequestBody receives a string of Json objects, not a Json object. However, in ajax requests, Json objects are often passed, and later found that the object can be turned into a string by JSON.stringify (data). At the same time, specify dataType: "json", contentType: "application/json" when making an ajax request so that you can easily pass an object or List to the Java side, and use @ RequestBody to bind the object or List.

Js code

$(document) .ready (function () {var saveDataAry= []; var data1= {"userName": "test", "address": "gz"}; var data2= {"userName": "ququ", "address": "gr"}; saveDataAry.push (data1); saveDataAry.push (data2) $.ajax ({type: "POST", url: "user/saveUser", dataType: "json", contentType: "application/json", data:JSON.stringify (saveData), success:function (data) {

}))

Java code

@ RequestMapping (value = "saveUser", method = {RequestMethod.POST}}) @ ResponseBody public void saveUser (@ RequestBody List users) {userService.batchSave (users);}

The difference between @ ModelAttribute and @ RequestBody annotations is that @ ModelAttribute annotations can get the return value directly at the front end.

@ Controllerpublic class Hello2ModelController extends BaseController {

@ RequestMapping (value = "/ helloWorld2") public String helloWorld (@ ModelAttribute ("myUser") User user) {user.setName ("Lao Wang"); return "helloWorld";}}

Key in model is myUser, and the foreground can obtain the corresponding user attributes directly through ${myUser.xx}.

Get it directly with HttpServletRequest

@ RequestMapping (method = RequestMethod.GET) public String get (HttpServletRequest request, HttpServletResponse response) {System.out.println (request.getParameter ("a")); return "helloWorld";}

Bind request parameters with the annotation @ RequestParam

An exception occurs when the request parameter a does not exist, which can be solved by setting the property required=false

For example: @ RequestParam (value= "a", required=false)

Controller is as follows

@ RequestMapping (value = "/ requestParam", method = RequestMethod.GET) public String setupForm (@ RequestParam ("a") String a, ModelMap model) {System.out.println (a); return "helloWorld";} above is how to obtain request parameters in Spring3 MVC. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.