SpringMVC @RequestMapping不設(shè)置value

從上個(gè)項(xiàng)目拷貝過(guò)來(lái)的form的action屬性忘了修改了

在controller上沒(méi)有設(shè)置@RequestMapping，方法上設(shè)置了但忘記設(shè)置value值，沒(méi)想到還是能訪問(wèn)到，弄拙成巧，讓我發(fā)現(xiàn)了這個(gè)問(wèn)題

本以為會(huì)默認(rèn)按照方法名來(lái)訪問(wèn)，當(dāng)我修改方法名后依然能訪問(wèn)到

猜想會(huì)以表單字段和參數(shù)列表的對(duì)應(yīng)關(guān)系來(lái)訪問(wèn)，修改后依然能訪問(wèn)到

因?yàn)槲疫@個(gè)項(xiàng)目所有的controller的命名空間沒(méi)有一個(gè)是“account”，所以猜想當(dāng)SpringMVC無(wú)法匹配到對(duì)應(yīng)的controller時(shí)會(huì)訪問(wèn)@RequestMapping沒(méi)有配置value的方法， 于是新建一個(gè)Controller類，也是只在方法上配置了一個(gè)沒(méi)有設(shè)置value的@RequestMapping,

這時(shí)啟動(dòng)tomcat報(bào)錯(cuò)：

Caused by: java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'testController' bean method
public java.lang.String com.ld.controller.TestController.login(java.lang.String,java.lang.String,java.lang.String,javax.servlet.http.HttpServletRequest)
to {[]}: There is already 'loginController' bean method
public java.lang.String com.ld.controller.LoginController.login(java.lang.String,java.lang.String,java.lang.String,javax.servlet.http.HttpServletRequest) mapped.
 at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:212)
 at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:184)
 at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:144)
 at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:123)
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:126)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
 ... 36 more

說(shuō)明猜想正確，兩個(gè)controller沖突了

后經(jīng)測(cè)試，當(dāng)@RequestMapping設(shè)置method屬性，如一個(gè)方法上設(shè)置為GET，另一個(gè)設(shè)置為POST，http請(qǐng)求的方式不同，不會(huì)沖突，會(huì)找到對(duì)應(yīng)的方法執(zhí)行。

Spring mvc中@RequestMapping 6個(gè)基本用法小結(jié)

小結(jié)下spring mvc中的@RequestMapping的用法

1、最基本的，方法級(jí)別上應(yīng)用

例如：

@RequestMapping(value="/departments")  
public String simplePattern(){ 
  System.out.println("simplePattern method was called");  
  return "someResult"; 
}  

則訪問(wèn)http://localhost/xxxx/departments的時(shí)候，會(huì)調(diào)用 simplePattern方法了

2、參數(shù)綁定

@RequestMapping(value="/departments")  
public String findDepatment(  
  @RequestParam("departmentId") String departmentId){ 
    System.out.println("Find department with ID: " + departmentId);  
    return "someResult";  
}  

形如這樣的訪問(wèn)形式：

/departments?departmentId=23就可以觸發(fā)訪問(wèn)findDepatment方法了

3、REST風(fēng)格的參數(shù)

@RequestMapping(value="/departments/{departmentId}")  
public String findDepatment(@PathVariable String departmentId){  
  System.out.println("Find department with ID: " + departmentId);  
  return "someResult";    
}  

形如REST風(fēng)格的地址訪問(wèn)，比如：

/departments/23，其中用(@PathVariable接收rest風(fēng)格的參數(shù)

4、REST風(fēng)格的參數(shù)綁定形式之2

先看例子，這個(gè)有點(diǎn)象之前的：

@RequestMapping(value="/departments/{departmentId}")  
public String findDepatmentAlternative(  
  @PathVariable("departmentId") String someDepartmentId){  
    System.out.println("Find department with ID: " + someDepartmentId);  
    return "someResult";  
}  

這個(gè)有點(diǎn)不同，就是接收形如/departments/23的URL訪問(wèn)，把23作為傳入的departmetnId,，但是在實(shí)際的方法findDepatmentAlternative中，使用

@PathVariable("departmentId") String someDepartmentId

將其綁定為 someDepartmentId，所以這里someDepartmentId為23

5、url中同時(shí)綁定多個(gè)id

@RequestMapping(value="/departments/{departmentId}/employees/{employeeId}")  
public String findEmployee(  
  @PathVariable String departmentId,  
  @PathVariable String employeeId){  
    System.out.println("Find employee with ID: " + employeeId +   
      " from department: " + departmentId);  
    return "someResult";  
}  

這個(gè)其實(shí)也比較好理解了。

6、支持正則表達(dá)式

@RequestMapping(value="/{textualPart:[a-z-]+}.{numericPart:[\\d]+}")  
public String regularExpression(  
  @PathVariable String textualPart,  
  @PathVariable String numericPart){  
    System.out.println("Textual part: " + textualPart +   
      ", numeric part: " + numericPart);  
    return "someResult";  
}  

比如如下的URL：/sometext.123，則輸出：

Textual part: sometext, numeric part: 123.

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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