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1.1.?@RequestMapping映射請求

SpringMVC?使用?@RequestMapping?注解為控制器指定可以處理那些URL?請求

@requestMapping??可以定義在?類?和?方法?上?

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package?com.ibigsea.springmvc.helloworld;??

??

import?org.springframework.stereotype.Controller;??

import?org.springframework.web.bind.annotation.RequestMapping;??

??

@Controller??

public?class?HelloWorld?{??

??????

????/**?

?????*?配置@RequestMapping?攔截?localhost:8080/springmvc/hello?請求??

?????*?@return?

?????*/??

????@RequestMapping("/hello")??

????public?String?helloWorld()?{??

????????System.out.println("hello?world");??

????????return?"helloworld";??

????}??

}??

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package?com.ibigsea.springmvc.helloworld;??

??

import?org.springframework.stereotype.Controller;??

import?org.springframework.web.bind.annotation.RequestMapping;??

??

@Controller??

@RequestMapping("/hello")??

public?class?HelloWorld?{??

??????

????/**?

?????*?配置@RequestMapping?攔截?localhost:8080/springmvc/hello/world?請求??

?????*?@return?

?????*/??

????@RequestMapping("/world")??

????public?String?helloWorld(){??

????????System.out.println("hello?world");??

????????return?"helloworld";??

????}??

}??

@RequestMapping

–?類定義處：提供初步的請求映射信息。相對于?WEB?應用的根目錄

–?方法處：提供進一步的細分映射信息。相對于類定義處的?URL。若

類定義處未標注?@RequestMapping，則方法處標記的?URL?相對于

WEB?應用的根目錄

DispatcherServlet?截獲請求后，就通過控制器上

@RequestMapping?提供的映射信息確定請求所對應的處理方法。

@RequestMapping?除了可以使用請求?URL?映射請求外，

還可以使用請求方法、請求參數及請求頭映射請求

1.2.?@RequestMapping限定請求方法、請求參數、請求頭

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/**?

?????*?接收GET請求?

?????*?@return?

?????*/??

????@RequestMapping(value="/get",method?=?RequestMethod.GET)??

????public?String?get(){??

????????System.out.println("get");??

????????return?"get";??

????}??

??

????/**?

?????*?接收POST請求?

?????*?@return?

?????*/??

????@RequestMapping(value="/post",method?=?RequestMethod.POST)??

????public?String?post(){??

????????System.out.println("post");??

????????return?"post";??

????}??

??????

????/**?

?????*?只接收?name?參數?

?????*?@return?

?????*/??

????@RequestMapping(value="/params",params="name")??

????public?String?params(String?name){??

????????System.out.println("hello?"+name);??

????????return?"helloworld";??

????}??

??????

????/**?

?????*?只接收請求頭中?Content-Type?為?text/html;charset=UTF-8的請求?

?????*?@return?

?????*/??

????@RequestMapping(value="/headers",headers="Content-Type:text/html;charset=UTF-8")??

????public?String?headers(){??

????????System.out.println("headers");??

????????return?"helloworld";??

????}??

1.3.?@RequestMapping匹配符

–??：匹配文件名中的一個字符

–?*：匹配文件名中的任意字符

–?**：**?匹配多層路徑

實例:

URL?:?/user/*/create

--?/user/bigsea/create?、?/user/sea/create?等URL

URL?:?/user/**/create

--?/user/big/sea/create?、?/user/sea/big/create?等URL

URL?:?/user/create??

--?/user/createaa?、/user/createbb

1.4.?@PathVariable?注解

帶占位符的?URL?是?Spring3.0?新增的功能，該功能在SpringMVC?向?REST?目標挺進發展過程中具有里程碑的意義

通過?@PathVariable?可以將?URL?中占位符參數綁定到控制器處理方法的入參中：URL?中的?{xxx}?占位符可以通過@PathVariable("xxx")?綁定到操作方法的入參中。

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/**?

?????*?localhost:8080/springmvc/hello/pathVariable/bigsea?

?????*?localhost:8080/springmvc/hello/pathVariable/sea?

?????*?這些URL?都會?執行此方法?并且將??<b>bigsea</b>、<b>sea</b>?作為參數?傳遞到name字段?

?????*?@param?name?

?????*?@return?

?????*/??

????@RequestMapping("/pathVariable/{name}")??

????public?String?pathVariable(@PathVariable("name")String?name){??

????????System.out.println("hello?"+name);??

????????return?"helloworld";??

????}??

JSP(這里指定全路徑):

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<h1>pathVariable</h1>??

<a?href="${pageContext.request.contextPath}/hello/pathVariable/bigsea"?>?name?is?bigsea?</a>??

<br/>??

<a?href="${pageContext.request.contextPath}/hello/pathVariable/sea"?>?name?is?sea</a>??

<br/>??

運行結果:

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hello?bigsea??

hello?sea??

1.5.?@RequestParam?綁定請求參數

在處理方法入參處使用?@RequestParam?可以把請求參數傳遞給請求方法

–?value：參數名

–?required：是否必須。默認為?true,?表示請求參數中必須包含對應的參數，若不存在，將拋出異常

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/**?

?????*?如果?required?=?true?則表示請求參數對應的?字段?必須存在.如果不存在則會拋出異常<br/>?

?????*?@param?firstName?可以為null?

?????*?@param?lastName?不能為null?.為null報異常?

?????*?@param?age?age字段表示如果沒有?age?參數?則默認值為?0??

?????*?@return?

?????*/??

????@RequestMapping("/requestParam")??

????public?String?requestParam(@RequestParam(value="firstName",required=false)String?firstName,??

????????????@RequestParam(?value="lastName"?,required?=?true)?String?lastName,??

????????????@RequestParam(value="age",required?=?false?,defaultValue="0")int?age)?{??

????????System.out.println("hello?my?name?is?"?+?(firstName?==?null???""?:?firstName)??

????????????????????????????????????????+?lastName?+?","?+?age?+"?years?old?this?year");??

????????return?"helloworld";??

????}??

Jsp:

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<a?href="requestParam?firstName=big&lastName=sea"?>?name?is?bigsea?,?age?is?0?</a>??

<br/>??

<a?href="requestParam?lastName=sea&age=23"?>?name?is?sea?,?age?is?23?</a>??

<br/>??

<a?href="requestParam"?>?throws?exception?</a>??

運行結果:

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hello?my?name?is?bigsea,0?years?old?this?year??

hello?my?name?is?sea,23?years?old?this?year??

1.6.?@RequestHeader?獲取請求頭

請求頭包含了若干個屬性，服務器可據此獲知客戶端的信息，通過?@RequestHeader?即可將求頭中的屬性值綁定到處理方法的入參中

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/**?

?*?獲取請求頭中的信息?

?*?@RequestHeader?也有?value?,required?,defaultValue?三個參數?

?*?@param?userAgent?

?*?@param?cookie?

?*?@return?

?*/??

@RequestMapping("/requestHeader")??

public?String?requestHeader(@RequestHeader("User-Agent")String?userAgent,@RequestHeader("Cookie")String?cookie){??

????System.out.println("userAgent:["+userAgent+"]");??

????System.out.println("cookie:["+cookie+"]");??

????return?"helloworld";??

}??

JSP:

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<a?href="requestHeader"?>?requestHeader?</a>??

運行結果:

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userAgent:[Mozilla/5.0?(Windows?NT?6.3;?WOW64)?AppleWebKit/537.36?(KHTML,?like?Gecko)?Chrome/44.0.2383.0?Safari/537.36]??

cookie:[JSESSIONID=DA3B15F559349EA2C3F08BE772FCAFD8]??

1.7.?@CookieValue?獲取?cookie值

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/**?

?????*?使用@CookieValue?綁定cookie值<br/>?

?????*?注解@CookieValue?也有?value?,required?,defaultValue?三個參數?

?????*?@param?session?

?????*?@return?

?????*/??

????public?String?cookieValue(@CookieValue(value?=?"JSESSIONID",?required=?false)String?session){??

????????System.out.println("JESSIONID:["+session+"]");??

????????return?"helloworld";??

????}??

JSP:

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<a?href="cookieValue"?>?cookieValue?</a>??

運行結果

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JESSIONID:[A4196EEDFD829B40CC1975F029A61328]??

1.8.?源碼分析

與50位技術專家面對面20年技術見證，附贈技術全景圖

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