@RequestMapping 用法详解
@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。
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;
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。
示例:
value / method 示例
默认RequestMapping("....str...")即为value的值;
@Controller @RequestMapping("/appointments") public class AppointmentsController {</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> AppointmentBook appointmentBook; @Autowired </span><span style="color: #0000ff;">public</span><span style="color: #000000;"> AppointmentsController(AppointmentBook appointmentBook) { </span><span style="color: #0000ff;">this</span>.appointmentBook =<span style="color: #000000;"> appointmentBook; } @RequestMapping(method </span>=<span style="color: #000000;"> RequestMethod.GET) </span><span style="color: #0000ff;">public</span> Map<String, Appointment><span style="color: #000000;"> get() { </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> appointmentBook.getAppointmentsForToday(); } @RequestMapping(value</span>="/{day}", method =<span style="color: #000000;"> RequestMethod.GET) </span><span style="color: #0000ff;">public</span> Map<String, Appointment> getForDay(@PathVariable @DateTimeFormat(iso=<span style="color: #000000;">ISO.DATE) Date day, Model model) { </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> appointmentBook.getAppointmentsForDay(day); } @RequestMapping(value</span>="/new", method =<span style="color: #000000;"> RequestMethod.GET) </span><span style="color: #0000ff;">public</span><span style="color: #000000;"> AppointmentForm getNewForm() { </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">new</span><span style="color: #000000;"> AppointmentForm(); } @RequestMapping(method </span>=<span style="color: #000000;"> RequestMethod.POST) </span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String add(@Valid AppointmentForm appointment, BindingResult result) { </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (result.hasErrors()) { </span><span style="color: #0000ff;">return</span> "appointments/new"<span style="color: #000000;">; } appointmentBook.addAppointment(appointment); </span><span style="color: #0000ff;">return</span> "redirect:/appointments"<span style="color: #000000;">; }
}
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)
@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"; }