springmvc? 5?? ?? ??: 1. ?? ?? ??? ???? ? ???? @RequestMapping 2. ?? ???? ?? ???? ?? ?? ??? ????? ???? ? ???? @RequestParam @PathVariable - ?? ??? ???? ? ?????.

@RequestMapping

? ?? ?? ??? ???? ? ???? ?????.
??? ? ???? ?????. ????? ????? ?? ??? ???? ???? ?? ???? ? ??? ?? ??? ????? ?????.

Attribute

value: ??? ?? ??? ?????. ?? ???? ?? ?? ?? ?? ?? ??? ???? ? ???? ??? ?? ????(URI ??? ?? ?? ??)value: 指定請(qǐng)求的實(shí)際地址，值可以是普通的具體值，可以指定為含有某變量的一類值(URI Template Patterns with Path Variables)
可以指定為含正則表達(dá)式的一類值(URI Template Patterns with Regular Expressions)
method: 指定請(qǐng)求的method類型，GET、POST、PUT、DELETE等
consumes: 指定處理請(qǐng)求的提交內(nèi)容類型(Content-Type)，例如application/json, text/html
produces: 指定返回的內(nèi)容類型，僅當(dāng)request請(qǐng)求頭中的(Accept)類型中包含該指定類型才返回
params: 指定request中必須包含某些參數(shù)值是，才讓該方法處理
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(qǐng)求

??1.處理get請(qǐng)求:?@RequestMapping(value?=?"index",method?=?RequestMethod.GET)
??2.springboot錯(cuò)誤處理(使用app客戶端返回json格式，使用瀏覽器返回html錯(cuò)誤頁(yè))
???@RequestMapping(produces?=?"text/html")
??3.方法僅處理request?Content-Type為“application/json”類型的請(qǐng)求
???@RequestMapping(value?=?"/pets",?consumes="application/json")
??4.僅處理請(qǐng)求中包含了名為“myParam”，值為“myValue”的請(qǐng)求
???@RequestMapping(value?=?"/pets/{petId}",?params="myParam=myValue")?
??5.僅處理request的header中包含了指定“Refer”請(qǐng)求頭和對(duì)應(yīng)值為“http://www.rxy.com/”的請(qǐng)求
???@RequestMapping(value?=?"/pets",?headers="Referer=http://www.rxy.com/")

@RequestParam

用于將請(qǐng)求參數(shù)區(qū)數(shù)據(jù)映射到功能處理方法的參數(shù)上
適用：方法參數(shù)

屬性

value/name: 兩個(gè)屬性都指代參數(shù)名字，即入?yún)⒌恼?qǐng)求參數(shù)名字(通常表單name屬性)
required: 是否必須，默認(rèn)是true，表示請(qǐng)求中一定要有相應(yīng)的參數(shù)，否則將拋出異常
defaultValue: 默認(rèn)值，表示如果請(qǐng)求中沒(méi)有同名參數(shù)時(shí)的默認(rèn)值，設(shè)置該參數(shù)時(shí)，自動(dòng)將required設(shè)為false

??如果是原子類型，不管加沒(méi)加注解，都必須有值，否則拋出異常，如果允許空值請(qǐng)使用包裝類代替
??index(@RequestParam?Integer?num){}??表示該參數(shù)必須傳遞，值允許為空
??表示該參數(shù)非必須，如果不傳則默認(rèn)為0
??getPageData(@RequestParam(name="pageNum",defaultValue="0")?String?pageNo,?String?pageSize)

@PathVariable

用于將請(qǐng)求URL中的模板變量映射到功能處理方法的參數(shù)上，即取出uri模板中的變量作為參數(shù)
適用：方法參數(shù)

屬性

value: 指定url模版變量名稱，如果名稱與方法參數(shù)名不一樣，則需要指定，否則可省略

????@RequestMapping("/index/{id}")
?????????public?String?index(@PathVariable("id")?String?sdf){
???????????System.out.println(sdf);
???????????return?"index";
?????}

@ResponseBody

該注解用于將Controller的方法返回的對(duì)象，通過(guò)適當(dāng)?shù)?code>HttpMessageConverter轉(zhuǎn)換為指定格式后，寫(xiě)入到Response對(duì)象的body數(shù)據(jù)區(qū)，默認(rèn)springmvc以json形式返回(使用jackson轉(zhuǎn)換器)
適用：方法，返回的數(shù)據(jù)不是html標(biāo)簽的頁(yè)面，而是其他某種格式的數(shù)據(jù)時(shí)(如json、xml等)使用
對(duì)比：@RequestBody 將HTTP請(qǐng)求正文轉(zhuǎn)換為適合的HttpMessageConverter對(duì)象
@ResponseBody ?? ???? ??? ? ??(?? ???? ??? URI ??? ??)

consumes: ?? ??? ?? ??? ??? ??(Content-Type)? ?????(?: application/json, text/html

params: ??? ??? ???? ?? ???? ?? ?? ???? ?? ???? ???
headers: ??? ???? ??? ?? ????? ????? ???. ?? ?? ???? ??? ??? ? ????<br><pre class="brush:php;toolbar:false">?????????$.ajax({ ???????????type:?&quot;POST&quot;, ???????????url:&quot;/role/saveRole&quot;, ???????????contentType:&quot;application/json&quot;, ???????????data:?JSON.stringify(_self.form)...</pre> <br>@RequestParam<br><br>? ?? ???? ?? ???? ?? ?? ??? ????? ???? ? ?????.<br>?? ??: ??? ????<br>

?/??: ? ?? ?? ???? ??, ? ??? ?? ????? ??? ?????(????? ?? ?? ??)

@RequestMapping(value?=?"/saveRole",method?=?RequestMethod.POST)
public?String?saveRole(@RequestBody?People?requestJson)?{}

@PathVariable

?? ?? URL? ??? ??? ?? ?? ??? ????, ? take? ?????. URI ???? ??? ????
?? ??: ??? ????

??

?: ??? ??? ???? ??? ??? ?? URL ??? ?? ??? ?????. ??? ???? ???. ??? ??? ?? ??

獲取cookie中的JSESSIONID
public?String?index(@CookieValue("JSESSIONID")?String?cookie){}

獲取請(qǐng)求中Accept-Encoding值，返回gzip,?deflate,?br
public?String?index(@RequestHeader("Accept-Encoding")?String?host){return?host;}

package?com.rxy.controller;

@Controller
public?class?HelloController?{
????
????@ExceptionHandler({?ArithmeticException.class?})
????@ResponseBody
????public?String?handleArithmeticException(Exception?e)?{
????????e.printStackTrace();
????????return?"json?data";
????}
????
????@ExceptionHandler({?IOException.class?})
????public?String?handleIOException(Exception?e)?{
????????e.printStackTrace();
????????//返回錯(cuò)誤頁(yè)面
????????return?"error";
????}

????@RequestMapping("/index")
????public?String?index(){
????????int?i?=?10?/?0;
????????return?"index";
????}

}

獲取請(qǐng)求中Accept-Encoding值，返回gzip,?deflate,?br
public?String?index(@RequestHeader("Accept-Encoding")?String?host){return?host;}

package?com.rxy.controller;

@Controller
public?class?HelloController?{
????
????@ExceptionHandler({?ArithmeticException.class?})
????@ResponseBody
????public?String?handleArithmeticException(Exception?e)?{
????????e.printStackTrace();
????????return?"json?data";
????}
????
????@ExceptionHandler({?IOException.class?})
????public?String?handleIOException(Exception?e)?{
????????e.printStackTrace();
????????//返回錯(cuò)誤頁(yè)面
????????return?"error";
????}

????@RequestMapping("/index")
????public?String?index(){
????????int?i?=?10?/?0;
????????return?"index";
????}

}