springmvc注解之@RequestMapping注解

Posted 吴二喵

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一、基本介绍

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。

二、示例

1、value / method 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);

C) 可以指定为含正则表达式的一类值( URI Template Patterns with Regular Expressions);

@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"; 


@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
```


produces的样例:

@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:

@Controller
@RequestMapping(value = "/pets/petId", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public Pet getPet(@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:

@Controller
@RequestMapping(value = "/pets/petId", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public Pet getPet(@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;

转载自:http://blog.csdn.net/walkerjong/article/details/7994326#

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