在使用表单进行提交的时候，一直报不支持POST方法的错误。
我在springmvc中的代码
@PostMapping("reg.do")
public String register(@Valid User user,Errors errors,Model m) {
//业务代码省略
}
在reg.html中的代码
<form id="regform" method="post">
账号：<input name="account" th:value="${user}!=null ? ${user.account} : ''">
<span class="err" th:if="${errors}!=null" th:text="${errors.get('account')}"></span><br>
昵称：<input name="name" th:value="${user}!=null ? ${user.name} : ''">
<span class="err" th:if="${errors}!=null" th:text="${errors.get('name')}"></span><br>
密码：<input name="pwd" type="password" th:value="${user}!=null ? ${user.pwd} : ''">
<span class="err" th:if="${errors}!=null" th:text="${errors.get('pwd')}"></span><br>
邮箱：<input name="email" th:value="${user}!=null ? ${user.email} : ''">
<span class="err" th:if="${errors}!=null" th:text="${errors.get('email')}"></span><br>
电话：<input name="phone"><br>
<button type="submit">注册</button>
</form>
按下注册按钮之后的报错
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sun Sep 06 15:54:58 CST 2020
There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported
org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported
at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:213)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:422)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:367)
at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getHandlerInternal(RequestMappingInfoHandlerMapping.java:110)
at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getHandlerInternal(RequestMappingInfoHandlerMapping.java:59)
at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:395)
at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1234)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1016)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
我在springmvc中不是写清楚了吗?指定了@PostMapping(“reg.do”)，但是为什么还是不能接收post方式的提交呢。忽然才发现，
我的form表单的action属性并没有指定需要跳转的地址 ‘reg.do’。
所以
表单会提交到当前页面！
还有一个现象，当我把method=post去掉之后发现页面并没有进行跳转，也没有报错。
如果不写指定method的话，默认是使用get方式提交。
但是使用get方式提交并没有像使用post方式提交一样，报不能处理get请求的错误，虽然在此处我也还是没有指定action，也就是当前提交的还是当前页面。
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