Spring 的MVC @RequestMapping

`@RequestMapping`

@Controller
@RequestMapping( " /appointments " )
public class AppointmentsController {

     private final 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 " ;
    }
}

DispatcherServle

< servlet >
         < servlet - name > dispatcher </ servlet - name >
         < servlet - class > org.springframework.web.servlet.DispatcherServlet </ servlet - class >
         < load - on - startup > 1 </ load - on - startup >
     </ servlet >
     < servlet - mapping >
         < servlet - name > dispatcher </ servlet - name >
         < url - pattern >* . do </ url - pattern >
     </ servlet - mapping >

/appointments /new.do
映射方法是 getNewForm()
/appointments.do
GET请求映射方法是 get()
POST请求映射方法是 add(@Valid AppointmentForm appointment, BindingResult result)

通过参数条件缩小路径映射

@RequestMapping(value = "/path", params="myParam=myValue")
public void add(){...}

http://localhost:8080/DynamicWebProject/hao/hello.do?myParam=myValue
URL中只有存在myParam=myValue参数时才被允许访问路径映射的方法

@RequestMapping(value = "/path", method = RequestMethod.POST, headers="content-type=text/*")
public void add(){...}

只有在URL的头信息中包含有content-type=text/*(content-type=text/xml)的POST请求才能访问add()方法

配合@RequestMapping使用的方法或注解
org.springframework.web.context.request.WebRequest或org.springframework.web.context.request.NativeWebRequest。通用请求参数允许访问 request/session属性，到本机的Servlet / Portlet API的。

java.util.Locale 当前请求的区域设置，由解析器提供最具体的语言环境。

java.io.InputStream /java.io.Reader访问请求的内容。这个值是原始的InputStream /Reader ,由Servlet API公开。

java.io.OutputStream /java.io.Writer生成响应的内容。这个值是原始的OutputStream /Writer，由Servlet API公开。

@ PathVariable注明获取URI模板变量的参数。

@ RequestParam注明为获取特定的servlet请求参数的参数。

@ RequestHeader 访问特定的servlet请求的HTTP头的参数。参数值转换为声明的方法的参数类型。

@ RequestBody 访问HTTP请求体参数。参数值转换为所声明的方法的参数类型使用HttpMessageConverters。

HttpEntity <？>访问servlet请求的HTTP头和内容。请求流将被转换为实体采用HttpMessageConverters。

java.util.Map/ org.springframework.ui.Model /org.springframework.ui.ModelMap为丰富的隐含模型，暴露在Web视图

org.springframework.validation.Errors / org.springframework.validation.BindingResult

org.springframework.web.bind.support.SessionStatus

Spring 的MVC @RequestMapping

@RequestMapping

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`@RequestMapping`