@RequestMapping注解详解

@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 {
<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&lt;String, Appointment&gt;<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&lt;String, Appointment&gt; 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">;
}

}

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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"; 
}
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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 示例

cousumes的样例:

@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
}
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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
}
}

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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
}
}

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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;

 

 

 

上面仅仅介绍了,RequestMapping指定的方法处理哪些请求,下面一篇将讲解怎样处理request提交的数据(数据绑定)和返回的数据。

 

 

参考资料:

1、 Spring Web Doc: 

spring-3.1.0/docs/spring-framework-reference/html/mvc.html
posted @ 2018-08-28 09:30  星朝  阅读(28627)  评论(0编辑  收藏  举报