很多人对于@requestmapping注解都不大了解，那么今天的文章要给大家介绍的就是和这个方面相关的内容，一起来了解一下@requestmapping吧。
requestmapping是一个用来处理请求地址映射的注解，它可以用在类或者是方法上。
类-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注解一共有6个属性，下面的话将它分成三类来进行一下详细的说明。
value，method：value-指定请求的实际地址，指定的地址可以是URI Template 模式;method-指定请求的method类型， GET、POST、PUT、DELETE等;
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;
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;
value/method示例
默认RequestMapping("....str...")即为value的值
@Controller
@RequestMapping("/appointments")
public class AppointmentsController
{
<span style="color: #0000ff">private<span style="color: #000000"> AppointmentBook appointmentBook;
@Autowired
<span style="color: #0000ff">public<span style="color: #000000"> AppointmentsController(AppointmentBook appointmentBook) {
<span style="color: #0000ff">this.appointmentBook =<span style="color: #000000"> appointmentBook;
}
@RequestMapping(method =<span style="color: #000000"> RequestMethod.GET)
<span style="color: #0000ff">public Map<String, Appointment><span style="color: #000000"> get() {
<span style="color: #0000ff">return<span style="color: #000000"> appointmentBook.getAppointmentsForToday();
}
@RequestMapping(value="/{day}", method =<span style="color: #000000"> RequestMethod.GET)
<span style="color: #0000ff">public Map<String, Appointment> getForDay(@PathVariable @DateTimeFormat(iso=<span style="color: #000000">ISO.DATE) Date day, Model model) {
<span style="color: #0000ff">return<span style="color: #000000"> appointmentBook.getAppointmentsForDay(day);
}
@RequestMapping(value="/new", method =<span style="color: #000000"> RequestMethod.GET)
<span style="color: #0000ff">public<span style="color: #000000"> AppointmentForm getNewForm() {
<span style="color: #0000ff">return <span style="color: #0000ff">new<span style="color: #000000"> AppointmentForm();
}
@RequestMapping(method =<span style="color: #000000"> RequestMethod.POST)
<span style="color: #0000ff">public<span style="color: #000000"> String add(@Valid AppointmentForm appointment, BindingResult result) {
<span style="color: #0000ff">if<span style="color: #000000"> (result.hasErrors()) {
<span style="color: #0000ff">return "appointments/new"<span style="color: #000000">;
}
appointmentBook.addAppointment(appointment);
<span style="color: #0000ff">return "redirect:/appointments"<span style="color: #000000">;
}
}value的uri值：
可以指定为普通的具体值;可以指定为含有某变量的一类值(URI Template Patterns with Path Variables);可以指定为含正则表达式的一类值( 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)
{
// ...
}
}consumes、produces示例
cousumes：
@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：
@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;
params、headers示例
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
}
}仅处理请求中包含了名为“myParam”，值为“myValue”的请求;
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
}
}仅处理request的header中包含了指定“Refer”请求头和对应值为XX的请求;
以上内容源于网络，仅供参考。
对于RequestMapping方面的一些内容就简单的介绍到这里了，更多相关内容，请继续通过本站的java架构师栏目来进行了解吧。
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