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How does Controller receive parameters in SpringBoot2? aiming at this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

Address value

@ PathVariable

Gets the path parameters. This form is url/ {id}.

? Transfer value

@ RequestParam

Gets the query parameters. In the form of url?name=

Use the annotation @ RequestParam to bind the request parameter to the method input parameter

An exception occurs when the request parameter username does not exist, which can be solved by setting the property required=false, for example: @ RequestParam (value= "username", required=false)

Body parameter

/ / application/jason

@ PostMapping (path = "/ demo1")

Public void demo1 (@ RequestBody Person person) {

No comments (form submission)

/ / form-data

@ PostMapping (path = "/ demo1")

Public void demo1 (Person person) {

Request header parameters and Cookie

@ RequestHeader

2. @ CookieValue

Examples

Java Code:

@ GetMapping ("/ demo3")

Public void demo3 (@ RequestHeader (name = "myHeader") String myHeader

@ CookieValue (name = "myCookie") String myCookie) {

System.out.println ("myHeader=" + myHeader)

System.out.println ("myCookie=" + myCookie)

You can do that, too.

@ GetMapping ("/ demo3")

Public void demo3 (HttpServletRequest request) {

System.out.println (request.getHeader ("myHeader"))

For (Cookie cookie: request.getCookies ()) {

If ("myCookie" .equals (cookie.getName () {

System.out.println (cookie.getValue ())

/ / request header parameters and Cookie

@ RequestMapping ("request5")

Public String test5 (@ RequestHeader (name = "Header") String Header

@ CookieValue (name = "cookie1") String cookie1

@ CookieValue (name = "cookie2") String cookie2) {

Return "Header:" + Header+ "cookie1:" + cookie1+ "cookie2" + cookie2

}

/ / Cookie

@ GetMapping ("/ ee")

Public String ee (@ RequestHeader (name= "myHeader") String myHeader,@CookieValue (name= "myCookie") String myCookie) {

System.out.println ("myHeader=" + myHeader)

System.out.println ("myCookie=" + myCookie)

Return "-" + myHeader+ "=" + myCookie

}

The parameters of the form are written in the formal parameters of the corresponding method of Controller

It applies to get submission, but not to post submission.

/ * *

* 1. Write the parameters of the form directly in the parameters of the corresponding method in Controller

* @ param username

* @ param password

* @ return

, /

@ RequestMapping ("/ addUser1")

Public String addUser1 (String username,String password) {

System.out.println ("username is:" + username)

@ ModelAttribute annotation to get FORM form data of POST request

/ * *

* use @ ModelAttribute annotations to get FORM form data for POST requests

* @ param user

* @ return

, /

@ RequestMapping (value= "/ addUser5", method=RequestMethod.POST)

Public String addUser5 (@ ModelAttribute ("user") UserModel user) {

System.out.println ("username is:" + user.getUsername ())

System.out.println ("password is:" + user.getPassword ())

Return "demo/index"

Test code

Controller

Package com.zz.controller

Import java.util.HashMap

Import java.util.Map

Import com.zz.entity.User

Import org.springframework.web.bind.annotation.*

@ RestController

@ RequestMapping ("test")

Public class TestController {

/ / pass a value by path

@ RequestMapping ("T1 / {p1}")

Public Map T1 (@ PathVariable ("p1") String paramter1) {

Map map=new HashMap ()

Map.put ("rs", paramter1)

Return map

}

/ /? Transfer value

@ RequestMapping ("T2")

Public Map T2 (@ RequestParam ("p1") String paramter1)

{

System.out.println (paramter1)

Map map=new HashMap ()

Map.put ("rs", paramter1)

Return map

}

/ / Body parameter

/ / application/jason

@ RequestMapping ("T3")

Public Map T3 (@ RequestBody User person) {

Map map=new HashMap ()

Map.put ("rs", person.getName ())

Return map

}

/ / No comments (submitted by form)

/ / form-data

@ RequestMapping ("T4")

Public Map T4 (User person) {

Map map=new HashMap ()

Map.put ("rs", person.getName ())

Return map

}

/ / request header parameters and Cookie

@ RequestMapping ("T5")

Public Map T5 (@ RequestHeader (name = "myHeader") String myHeader

@ CookieValue (name = "myCookie") String myCookie) {

System.out.println ("myHeader=" + myHeader)

System.out.println ("myCookie=" + myCookie)

Map map=new HashMap ()

Map.put ("rs", myHeader)

Return map

}

/ / the parameters of the form are written in the formal parameters of the corresponding method of Controller

/ / it is applicable to get submission, not post submission.

@ RequestMapping ("T6")

Public Map T6 (String name,String pwd) {

Map map=new HashMap ()

Map.put ("rs", name)

Return map

}

}

HTML

Bootstrap instance

test

T1

T2

T3

T4

T5

T6

$(document) .ready (function () {

/ / write your code here.

$("# T1") .click (function () {

$.get ("test/t1/jacky", function (data) {

Alert ("Data Loaded:" + data.rs)

});

})

$("# T2") .click (function () {

$.get ("test/t2?p1=jerry", function (data) {

Alert ("Data Loaded:" + data.rs)

});

})

$("# T3") .click (function () {

Var data = {"name": "petter", "pwd": "123"}

$.ajax ({

Url: "test/t3"

Async: false

Type: "POST"

ContentType: 'application/json'

DataType: 'json'

Data: JSON.stringify (data)

Success: function (data) {

Alert ("Data Loaded:" + data.rs)

}

});

})

$("# T4") .click (function () {

Var data = {"name": "petter", "pwd": "123"}

$.ajax ({

Url: "test/t4?name=jacky"

Async: false

Type: "POST"

ContentType: 'form-data'

Success: function (data) {

Alert ("Data Loaded:" + data.rs)

}

});

})

/ / not available for the time being

$("# T5") .click (function () {

Var data = {"name": "petter", "pwd": "123"}

$.ajax ({

Url: "test/t5"

Async: false

Type: "POST"

ContentType: 'application/json'

DataType: 'json'

Headers: {

'Header': "from header"

'Cookie':'sdfs'

}

Data: JSON.stringify (data)

Success: function (data) {

Alert ("Data Loaded:" + data.rs)

}

});

})

$("# T6") .click (function () {

$.get ("test/t6?name=jerry&pwd=234", function (data) {

Alert ("Data Loaded:" + data.rs)

});

})

});

SpringBoot Form post failed to submit a solution to the jump

Error log: tSupportedException: Request method 'POST' not supported

Solution: return "redirect:/index/toIndex" in the post controller method; execute the jump controller of get

Package com.zz.controller;/**

* @ Description: description

* @ Author: Bsea

* @ CreateDate: ${Date}

, /

Import com.zz.config.DataValidationException

Import com.zz.entity.Member

Import com.zz.form.MemberForm

Import com.zz.service.MemberService

Import com.zz.util.FormUtil

Import com.zz.util.ResultVOUtil

Import com.zz.vo.ResultVO

Import io.swagger.annotations.Api

Import io.swagger.annotations.ApiImplicitParam

Import io.swagger.annotations.ApiImplicitParams

Import io.swagger.annotations.ApiOperation

Import org.springframework.beans.BeanUtils

Import org.springframework.data.domain.Page

Import org.springframework.stereotype.Controller

Import org.springframework.validation.BindingResult

Import org.springframework.web.bind.annotation.*

Import javax.annotation.Resource

Import javax.validation.Valid

/ * *

* @ Description: java class function description

* @ Author: Bsea

* @ CreateDate: 2019-10-16 $21:27 $

, /

@ Api (value = "member Controller")

@ Controller

@ RequestMapping ("index")

Public class IndexController {

@ Resource

MemberService memberService

@ ApiOperation (value = "add member", notes = "find member by name")

@ ApiImplicitParam (name = "name", value = "member name", required = true, dataType = "String", paramType = "path")

@ PostMapping ("add")

Public String add (@ Valid MemberForm member, BindingResult bindingResult) {

System.out.println (member)

If (bindingResult.hasErrors ()) {

Throw new DataValidationException ("validation error")

}

Member member1=new Member ()

BeanUtils.copyProperties (member,member1)

If (memberService.add (member1)! = null) {

Return "redirect:/index/toIndex"

} else {

Return "redirect:/index/toIndex"

}

}

@ RequestMapping ("toIndex")

Public String toIndex () {

Return "/ index2.html"

}

}

The answer to the question about how Controller receives parameters in SpringBoot2 is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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