Java—RequestMapping相關用法

RequestMapping是一個用來處理請求地址映射的註解,可用於類或方法上。用於類上,表示類中的全部響應請求的方法都是以該地址做爲父路徑。
它有6個屬性:
1.value:指定請求的具體地址:
value的uri值爲如下三類:
A) 能夠指定爲普通的具體值:
(value = "/add"),其直接訪問controller的路徑是ip:port/member/add。它還有一種寫法就是下面例子中方法上的value = { "/add", "/add.html" },
它表示咱們既能夠經過:port/member/add來訪問,也能夠經過:port/member/add.html來訪問。html

@Controller
@RequestMapping(value = "/member")
public class MemberController extends BaseMultiController {

    @Autowired(required=true)
    private MemberService memberService;

    @RequestMapping(value = { "/add", "/add.html" }, method = { RequestMethod.GET,RequestMethod.POST })
    @ResponseBody
    public ModelAndView add(HttpServletRequest request, HttpServletResponse response) {
        Map<String, Object> map = new HashMap<String, Object>();
        Member member = new Member();
        member.setId("1");
        member.setNickname("guoxiaoming");
        this.memberService.add(member);
        return toView("add", map);
    }
}

B) 能夠指定爲含有某變量的一類值:也就是前臺傳來的參數,該參數day就是前臺或者頁面地址上帶的參數;其寫法是value="/{day}"
切記:必須在該參數的前面加上@PathVariable註解,這樣才能代表該參數是變量web

@RequestMapping(value="/{day}", method = RequestMethod.GET)
public Map<String, Appointment> getForDay(@PathVariable @DateTimeFormat(iso=ISO.DATE) Date day, Model model) {
    return appointmentBook.getAppointmentsForDay(day);
}

咱們也能夠將A和B兩種結合起來使用,以下:value="/owners/{ownerId}正則表達式

@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";
}

C) 能夠指定爲含正則表達式的一類值,以下value="/spring-web/{symbolicName:[a-z-]+}-{version:\d\.\d\.\d}.{extension:\.[a-z]}"。(不推薦使用)spring

@RequestMapping("/spring-web/{symbolicName:[a-z-]+}-{version:\d\.\d\.\d}.{extension:\.[a-z]}")
public void handle(@PathVariable String version, @PathVariable String extension) {    
    // ...
}

2.method:指定請求的method類型, GET、POST、PUT、DELETE等;
一般咱們只寫method = RequestMethod.POST,測試時咱們能夠用method = RequestMethod.GET,還能夠寫成method = { RequestMethod.GET,RequestMethod.POST }

3.params: 指定request中必須包含某些參數值時才讓該方法處理。json

@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
  }
}

僅處理請求中包含了名爲「myParam」,值爲「myValue」的請求;

4.headers: 指定request中必須包含某些指定的header值,才能讓該方法處理請求。app

@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
    }
}

僅處理request的header中包含了指定「Refer」請求頭和對應值爲「http://www.ifeng.com/」的請求;

5.consumes: 指定處理請求的提交內容類型(Content-Type),例如application/json, text/html;測試

@Controller
@RequestMapping(value = "/pets", method = RequestMethod.POST, consumes="application/json")
public void addPet(@RequestBody Pet pet, Model model) {    
    // implementation omitted
}

方法僅處理request Content-Type爲「application/json」類型的請求。

6.produces:    指定返回的內容類型,僅當request請求頭中的(Accept)類型中包含該指定類型才返回;ui

@Controller
@RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public Pet getPet(@PathVariable String petId, Model model) {    
    // implementation omitted
}

方法僅處理request請求中Accept頭中包含了"application/json"的請求,同時暗示了返回的內容類型爲application/json。this

 

這就是Java的魅力,你學會了嗎?spa

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