form data is not getting posted to spring controller - spring

Question

Form data:
form dat from UI developer tools
user.username:SS
user.email:SGFG#GMAIL.COM
user.firstName:WWW
user.lastName:FF
ext-gen1170:ENV_DEV
ext-gen1171:false
ext-gen1172:false
user.password:
userGroupPermissions:[{"userName":"SS","groupName":"ENV_DEV","permission":"*"}]
Web.xml for the dispatcher servlet:
<servlet-mapping>
<servlet-name>user</servlet-name>
<url-pattern>/spring/</url-pattern>
</servlet-mapping>
Controller:
#RequestMapping(value ="/createUser/", method = RequestMethod.POST)
#Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
#ResponseBody
public String createUser(#RequestParam(value = "user.username", required = true) String username,
#RequestParam(value = "user.email", required = true) String email,
#RequestParam(value = "user.firstName", required = true) String firstName,
#RequestParam(value = "user.lastName", required = true) String lastName,
#RequestParam(value = "userGroupPermissions", required = true) UserGroupPermission userGroupPermissions,
#RequestParam(value = "password", required = false) String password) throws IOException {
Above details will be added to handle the request
There are no errors in console but the breakpoint is not hit when I keep the break point in controller.
I am getting 404 for this code.
Extjs:
var url = '/spring/createUser';

Answer 1

There are two ways to resolve this -- change the way you are sending parameters to Java or change the way you are receiving parameters.
Just change Java
To keep things simple you should change Java.
GET requests should use #RequestParam arguments in Spring controllers in a way you specified.
POST/PUT requests should use #RequestBody argument in Spring controllers.
So the Spring controller should look like this:
#RequestMapping(value ="/createUser/", method = RequestMethod.POST)
#ResponseBody
public String createUser(#RequestBody UserParams params)
Obviously if you need the #Transactional part you should also leave it.
Sending various requests with ExtJS
Here are some examples on how to use Ext.Ajax.request to send various types of requests.
I've used Polish in values so you can also see how encoding of UTF-8 text works.
Query string
Sending in query string means things get encoded directly in URL after ?. E.g. /test?firstName=Imi%C4%99&lastName=Nazwisko.
// (Java/Spring can get this with `#RequestParam`)
Ext.Ajax.request({
url: '/test',
method: 'GET',
params: {
firstName: 'Imię',
lastName: 'Nazwisko'
}
});
Form data
This is used when sending forms in a standard way. Things get encoded in the body of the request, but the format is actually the same as for the query string (e.g. firstName=Imi%C4%99&lastName=Nazwisko).
// (Java/Spring can get this with `#RequestBody`)
Ext.Ajax.request({
url: '/test',
method: 'PUT',
params: {
firstName: 'Imię',
lastName: 'Nazwisko'
}
});
Request payload
This is a JSON communication. Things get encoded in the body of the request, but in a JSON format (e.g. {"firstName":"Imi\u0119","lastName":"Nazwisko"}).
// (Java/Spring can get this with `#RequestBody`)
Ext.Ajax.request({
url: '/test',
method: 'PUT',
jsonData: {
firstName: 'Imię',
lastName: 'Nazwisko'
}
});
Query string in PUT/POST request
You can trick ExtJS to pass parameters in the URL rather then request body. When both params and jsonData are present in the Ext.Ajax.request one of them has to be put in the URL.
So to pass params in the query string use this:
Ext.Ajax.request({
url: '/test',
method: 'PUT',
params: {
firstName: 'Imię',
lastName: 'Nazwisko'
},
jsonData: {}
});
Note the empty jsonData. This will be encoded in request body as {} and can simply be omitted on the receiving end. In this case Java/Spring.
So this way you would receive all params as #RequestParam arguments in your Spring controller.