@RequestMapping explanation

Brief introduction:

@RequestMapping

Requestmapping is an annotation that handles request address mappings and can be used on classes or methods. On a class, the method that represents all response requests in a class is the parent path of the address.

The requestmapping annotation has six properties, and we'll describe her in three categories below.

1, value, method;

Value: Specifies the actual address of the request, the specified address can be the URI Template mode (which will be explained later);

Method: Specifies the type of method requested, GET, POST, PUT, delete, and so on;

2, Consumes,produces;

Consumes: Specifies the type of submission to process the request (Content-type), such as Application/json, text/html;

Produces: Specifies the type of content returned, only if the specified type is included in the (Accept) type in the request header;

3, Params,headers;

Params: Specifies that some parameter values must be included in the request before the method is processed.

Headers: Specifies that certain header values must be included in the request in order for the method to process requests.

Example: 1, value/method example

Default Requestmapping ("...") that is value;

@Controller @requestmapping ("/appointments") public class Appointmentscontroller {private AppointmentBook        AppointmentBook; @Autowired public Appointmentscontroller (AppointmentBook appointmentbook) {This.appointmentbook = Appointmentbo    Ok } @RequestMapping (method = requestmethod.get) public map<string, appointment> GET () {return appointmen    Tbook.getappointmentsfortoday (); } @RequestMapping (value= "/{day}", method = requestmethod.get) public map<string, appointment> Getforday (@PathV Ariable @DateTimeFormat (Iso=iso.    Date day, model model) {return appointmentbook.getappointmentsforday (day); } @RequestMapping (value= "/new", method = requestmethod.get) public appointmentform Getnewform () {return new    Appointmentform (); } @RequestMapping (method = requestmethod.post) public String Add (@Valid appointmentform appointment, Bindingresult R Esult) {if (Result.haserrors ()) {return "AppointmEnts/new ";        } appointmentbook.addappointment (appointment);    return "Redirect:/appointments"; }}

The URI value of value is the following three categories:

A) can be specified as a normal specific value;

B) can be specified as a class of values containing a variable (URI Template Patterns with Path Variables);

C) can be specified as a class of values with regular expressions (URI Template Patterns with Regular Expressions);

Example B)

@RequestMapping (value= "/owners/{ownerid}", method=requestmethod.get) public String findowner (@PathVariable string ownerID, model model) {  owner owner = ownerservice.findowner (ownerid);    Model.addattribute ("owner", owner);    return "Displayowner"; }

Example C)

@RequestMapping ("/spring-web/{symbolicname:[a-z-]+}-{version:\d\.\d\.\d}.{ Extension:\. [A-Z]} ")  public void handle (@PathVariable string version, @PathVariable string extension) {        //...  }}

2 consumes, produces example

Examples of Cousumes:

@Controller @requestmapping (value = "/pets", method = Requestmethod.post, consumes= "Application/json") public void Addpet (@RequestBody Pet Pet, model model) {        //implementation omitted}

The Content-type method only processes requests with the request "Application/json" type.

Examples of produces:

@Controller @requestmapping (value = "/pets/{petid}", method = Requestmethod.get, produces= "Application/json") @ Responsebodypublic Pet Getpet (@PathVariable String Petid, model model) {        //implementation omitted}

The Application/json method only handles requests in the request that accept headers contain "a", and implies that the returned content type is Application/json;

3 Params, headers example

Examples of params:

@Controller @requestmapping ("/owners/{ownerid}") public class Relativepathuritemplatecontroller {  @ Requestmapping (value = "/pets/{petid}", method = Requestmethod.get, params= "Myparam=myvalue") public  void Findpet ( @PathVariable string ownerid, @PathVariable string petid, model model) {        //implementation omitted  }}

A request with a value of "myvalue" named "Myparam" is included in the processing request only;

Examples of headers:

@Controller @requestmapping ("/owners/{ownerid}") public class Relativepathuritemplatecontroller {@RequestMapping ( Value = "/pets", method = Requestmethod.get, headers= "referer=http://www.ifeng.com/") public  void Findpet (@ Pathvariable string ownerid, @PathVariable string petid, model model) {        //implementation omitted  }}

The header that processes request only contains a request that specifies a "Refer" request header and a corresponding value of " http://www.ifeng.com/ ";

The above only describes which requests are handled by the method specified by requestmapping

@RequestMapping explanation