我在我的 Postman 中遇到了这个错误（POST 和 DELETE 出现了这个错误），希望有人能解决这个问题

Question

"timestamp": "2020-01-19T08:36:05.729+0000",
    "status": 405,
    "error": "Method Not Allowed",
    "message": "Request method 'POST' not supported",
    "trace": "org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported\r\n\tat org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:201)\r\n\tat org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:421)\r\n\tat org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:367)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:449)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:67)\r\n\tat org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:395)\r\n\tat org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1234)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1016)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)\r\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)\r\n\tat org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)\r\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:660)\r\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)\r\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:741)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\r\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\r\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\r\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\r\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\r\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)\r\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)\r\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)\r\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)\r\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)\r\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)\r\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)\r\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)\r\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)\r\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)\r\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1598)\r\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\r\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)\r\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)\r\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)\r\n\tat java.lang.Thread.run(Unknown Source)\r\n",
    "path": "/automobil/6"
}

trace 值转义为：

org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:201)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:421)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:367)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:449)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getHandlerInternal(RequestMappingHandlerMapping.java:67)
    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:660)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    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:367)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1598)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

---

这是我的控制器类

@Autowired
private AutomobiliDaoService service;

@GetMapping(path = "/automobil")
public List<PolovniAutomobili> getAll() {
    return service.findAll();
}

@GetMapping(path = "/automobil/{id}")
public PolovniAutomobili getAutomobili(@PathVariable int id) {
    return service.findOne(id);
}

@RequestMapping(method = RequestMethod.POST, value = "/automobil")
public void addAutomobili(@RequestBody PolovniAutomobili polovniAutomobili) {
    service.addAutomobil(polovniAutomobili);
}

@RequestMapping(method = RequestMethod.DELETE, value = "/automobil")
public void deleteAutomobili(@RequestBody PolovniAutomobili polovniAutomobili) {
    service.deleteAutomobil(polovniAutomobili);
}

---

这是我的组件类

public static List<PolovniAutomobili> automobil = new ArrayList<>();

    static {

        automobil.add(new PolovniAutomobili(1, 2012, "Polo", "Volkswagen", 75.00));
        automobil.add(new PolovniAutomobili(2, 2018, "Arteon", "Volkswagen", 155.00));
        automobil.add(new PolovniAutomobili(3, 2006, "Clio", "Renault", 55.00));
        automobil.add(new PolovniAutomobili(4, 2011, "Punto", "Fiat", 60.00));
        automobil.add(new PolovniAutomobili(5, 2010, "Spark", "Chevrollete", 65.00));

    }

    public List<PolovniAutomobili> findAll() {
        return automobil;
    }

    public PolovniAutomobili findOne(int id) {
        for(PolovniAutomobili polovniautomobili : automobil) {
            if(polovniautomobili.getId()==id) {
                return polovniautomobili;
            }
        }

        return null;
    }

    public void addAutomobil(PolovniAutomobili polovniAutomobili) {
        automobil.add(polovniAutomobili);
    }

    public void deleteAutomobil(PolovniAutomobili polovniAutomobili) {
        automobil.remove(polovniAutomobili);
    }

Answer 1

您正在发布到 /automobil/6，但在您的控制器中，您只有 /automobil 的 POST 映射。

要么将您的数据发布到/autmobil，要么将您的发布映射更改为/autmobil/{id}，并使用路径变量作为id。

Answer 2

当你想添加新内容时，必须使用POST方法，而当你想检索现有内容时，你必须使用GET方法；当你想删除一个现有的内容时，你必须使用DELETE 方法。

---

添加新车

你需要一个POST 方法。

@PostMapping("automobil")
public void addAutomobili(@RequestBody PolovniAutomobili polovniAutomobili) {
    service.addAutomobil(polovniAutomobili);
}

您可以像这样在邮递员中提供这些数据（基于您在 cmets 中添加的内容）：

删除现有汽车

您需要DELETE 方法。要遵循 RESTfull 准则，最好使用路径变量引用资源。

@DeleteMapping("automobil/{automobilId}")
    public void addAutomobili(@PathVariable Integer automobilId) {
        service.deleteAutomobil(automobilId);
    }

您必须修改组件的 deleteAutomobil 方法（通常称为 Service）。 使用Map 而不是List 可能会更好（因为您管理ID 来识别汽车）。在这种情况下删除也会更容易：

public void deleteAutomobili(Integer automobilId) {
            if(automobilMap.containsKey(automobilId))
                 automobilMap.remove(automobilId);
            else {
               // notify that resource doesn't exists
            }
    }

这是对 Postman 的调用（请注意，这里没有正文）：

---

Map 是一种将元素存储为键值对的结构。您可以通过键访问元素。请记住，每个键都必须是唯一的。 您的服务类应如下所示：

public static Map<Integer, PolovniAutomobili> automobil = new HashMap<>();
static {

    automobil.put(1, new PolovniAutomobili(1, 2012, "Polo", "Volkswagen", 75.00));
    automobil.put(2, new PolovniAutomobili(2, 2018, "Arteon", "Volkswagen", 155.00));
    automobil.put(3, new PolovniAutomobili(3, 2006, "Clio", "Renault", 55.00));
    automobil.put(4, new PolovniAutomobili(4, 2011, "Punto", "Fiat", 60.00));
    automobil.put(5, new PolovniAutomobili(5, 2010, "Spark", "Chevrollete", 65.00));

}

public List<PolovniAutomobili> findAll() {
    return automobil.values();
}

public PolovniAutomobili findOne(int id) {
    // if id is not a ky, it will return null (you can manage it)
    return automobil.get(id);
}

public void addAutomobil(PolovniAutomobili polovniAutomobili) {
    automobil.put(polovniAutomobili.getId(), polovniAutomobili);
}

public void deleteAutomobil(int id) { 
    if(automobil.containsKey(id))
        automobil.remove(id);
    else
        System.out.println("Id not found");
}