Java 不支持Spring Boot 405 POST方法，但GET方法有效

我正在使用SpringBoot和SpringMVC做一个简单的CRUD用户注册HTML5表单，其中有许多字段要使用post提交方法发布。我有一个REST控制器，它使用@Controller和@ResponseBody，通过一个用户服务调用方法来处理使用Spring的JPA存储库对存储库的GET、POST调用。一旦用户输入新的用户记录并点击提交按钮，控制器将保存记录并使用Spring的模型和视图传输到listalUsers.html视图（其中包含一个显示所有保存用户的网格）

当我在提交表单和控制器方法中都使用GET和POST方法作为操作方法时，用户记录成功保存，但在此之后，GET方法成功地将我的视图定向到listalUsers.html，而POST方法没有。当我使用POST方法时，我会得到一个“Spring Boot 405 POST方法不受支持”，并且控制器不会将我定向到视图listalUsers.html。如何使用POST方法重定向到视图listalUsers.html？我在下面复制我的代码

registerNewUser.html：

<div class="card" style="">
  <div class="container" style="padding:30px;">
    <span style="font-size:20pt;">用户注册</span><br/><br/>
    <form id= "add_user" name="add_user" method="POST" action="/addUser">
    <div class="card-body">
    <table style="border-collapse: separate; border-spacing: 10px;" cellpadding="10" cellspacing="10" width="50%">
    <tr><td>昵称</td><td><input type="text" id="txtUserName" name="txtUserName" style="" size="20" placeholder="单行输入"></td></tr>
    <tr><td>电话号码</td><td><input type="text" id="txtTelNo" name="txtTelNo" style="" size="20" placeholder="单行输入"></td></tr>
    <tr><td>密码</td><td><input type="password" id="txtPassword" name="txtPassword" style="" size="20" placeholder=""></td></tr>
    <tr><td>邮箱</td><td><input type="text" id="txtEmail" name="txtEmail" style="" size="20" placeholder="单行输入"></td></tr>
    <tr><td colspan="2" style="height:20px;"></td></tr>
    <tr><td colspan="2"><input type="submit" style="width:60%;text-align:center;" value="注册"></td></tr>
    </table>
    </div>
    </form>
    
     
  </div>
</div>

我在控制台中收到以下错误消息：

2021-01-24 23:51:12.604[0;39m [33m WARN[0;39m [35m17700[0;39m [2m---[0;39m [2m[nio-8080-exec-7][0;39m [36m.w.s.m.s.DefaultHandlerExceptionResolver[0;39m [2m:[0;39m Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported]

此错误消息显示在白色页面上：

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.support.WebContentGenerator.checkRequest(WebContentGenerator.java:381)
    at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:536)
    at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:53)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962)
    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.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113)
    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.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113)
    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.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113)
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:171)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1393)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1138)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1077)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962)
    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:97)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:832)

---

您混淆了@RequestBody和@RequestParam。

---

您的控制器方法需要一个RequestBody对象，而不是字符串参数。

我终于让它与POST方法一起工作了。我只是在控制器的返回参数中添加了一个“redirect:”，以重定向到所需的视图，当然也更改为调用表单和控制器的POST方法。下面是我修改过的代码：

    //login
    @RequestMapping(value= "/login", method= RequestMethod.POST)
    public String login(@RequestParam("txtUserName") String usrName, @RequestParam("txtPassword") String password) {
        
        System.out.println("LOGIN UserName : " + usrName + " Password : " + password);
        
        //Process the admin password - hardcoded
        if(usrName.equals("admin") && password.equals("admin123")) 
            
            { return "redirect:main.html"; }
        
        else 
            
            { return "redirect:invalid_login.html"; }
        
    }

---

这篇文章可能会帮助你们解决这个问题。我以前使用POST方法将RequestParams用于@RequestMapping，没有任何问题。

    //login
    @RequestMapping(value= "/login", method= RequestMethod.POST)
    public String login(@RequestParam("txtUserName") String usrName, @RequestParam("txtPassword") String password) {
        
        System.out.println("LOGIN UserName : " + usrName + " Password : " + password);
        
        //Process the admin password - hardcoded
        if(usrName.equals("admin") && password.equals("admin123")) 
            
            { return "redirect:main.html"; }
        
        else 
            
            { return "redirect:invalid_login.html"; }
        
    }