spring学习之requestmapping详解

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@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;
    示例:
    默认RequestMapping(“….str…”)即为value的值;
@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);
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";   }  

C) 可以指定为含正则表达式的一类值( URI Template Patterns with Regular Expressions);
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;
consumes: 指定处理请求的提交内容类型(Content-Type),例如application/json, text/html;
示例(处理方法只处理 request Content-Type 为“application/json”的亲求):

@Controller  @RequestMapping(value = "/pets", method = RequestMethod.POST, consumes="application/json")  public void addPet(@RequestBody Pet pet, Model model) {          // implementation omitted  }  

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;
示例(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):

@Controller  @RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, produces="application/json")  @ResponseBody  public Pet getPet(@PathVariable String petId, Model model) {          // implementation omitted  }  

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。
示例( 仅处理请求中包含了名为“myParam”,值为“myValue”的请求):

@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    }  }  

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( 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):

@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    }  }  
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