@RequestMapping之地址映射
引言:
前段时间项目中用到了RESTful模式来开发程序,但是当用POST、PUT模式提交数据时,发现服务器端接受不到提交的数据(服务器端参数绑定没有加任何注解),查看了提交方式为application/json, 而且服务器端通过request.getReader() 打出的数据里确实存在浏览器提交的数据。
为了找出原因,便对参数绑定(@RequestParam、 @RequestBody、 @RequestHeader 、 @PathVariable)进行了研究,同时也看了一下HttpMessageConverter的相关内容,在此一并总结。
简介:
@RequestMapping
RequestMapping是一个用来处理请求地址映射的注解,可用于类或方法上。用于类上,表示类中的所有响应请求的方法都是以该地址作为父路径。
RequestMapping注解有六个属性,下面我们把她分成三类进行说明。
1、value, method;
-
value
:指定请求的实际地址,指定的地址可以是URI Template 模式(后面将会说明); -
method
:指定请求的method类型, GET、POST、PUT、DELETE等;
2、consumes,produces;
-
consumes
:指定处理请求的提交内容类型(Content-Type),例如application/json, text/html; -
produces
:指定返回的内容类型,仅当request请求头中的(Accept)类型中包含该指定类型才返回;
3、 params,headers;
-
params
:指定request中必须包含某些参数值是,才让该方法处理。 -
headers
:指定request中必须包含某些指定的header值,才能让该方法处理请求。
示例:
1、value / method 示例
默认RequestMapping("....str...")即为value的值;
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@Controller @RequestMapping ( "/appointments" ) public class AppointmentsController { private AppointmentBook appointmentBook; @Autowired public AppointmentsController(AppointmentBook appointmentBook) { this .appointmentBook = appointmentBook; } @RequestMapping (method = RequestMethod.GET) public Map<String, Appointment> get() { return appointmentBook.getAppointmentsForToday(); } @RequestMapping (value= "/{day}" , method = RequestMethod.GET) public Map<String, Appointment> getForDay( @PathVariable @DateTimeFormat (iso=ISO.DATE) 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 result) { if (result.hasErrors()) { return "appointments/new" ; } appointmentBook.addAppointment(appointment); return "redirect:/appointments" ; } } |
value的uri值为以下三类:
A) 可以指定为普通的具体值;
B) 可以指定为含有某变量的一类值(URI Template Patterns with Path Variables);
C) 可以指定为含正则表达式的一类值( URI Template Patterns with Regular Expressions);
example B)
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@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)
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@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 示例
cousumes的样例:
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@Controller @RequestMapping (value = "/pets" , method = RequestMethod.POST, consumes= "application/json" ) public void addPet( @RequestBody Pet pet, Model model) { // implementation omitted } |
方法仅处理request Content-Type为“application/json”类型的请求。
produces的样例:
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@Controller @RequestMapping (value = "/pets/{petId}" , method = RequestMethod.GET, produces= "application/json" ) @ResponseBody public Pet getPet( @PathVariable String petId, Model model) { // implementation omitted } |
方法仅处理request请求中Accept头中包含了"application/json"的请求,同时暗示了返回的内容类型为application/json;
3 params、headers 示例
params的样例:
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@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 } } |
仅处理请求中包含了名为“myParam”,值为“myValue”的请求;
headers的样例:
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@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 } } |
仅处理request的header中包含了指定“Refer”请求头和对应值为“http://www.ifeng.com/”的请求;
上面介绍了,RequestMapping指定的方法处理哪些请求,以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/walkerJong/article/details/7994326