報錯

使用@RequestBody注解參數

@PostMapping("/info")
InfoDTO saveInfo(@RequestBody InfoDTO InfoDTO);

請求不傳任何參數時，有如下錯誤

Required request body is missing: xxx throws java.lang.InterruptedException
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:163)
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:133)
org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:179)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:146)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:645)
...

原因

查看源碼

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestBody {

	/**
	 * Whether body content is required.
	 * <p>Default is {@code true}, leading to an exception thrown in case
	 * there is no body content. Switch this to {@code false} if you prefer
	 * {@code null} to be passed when the body content is {@code null}.
	 * @since 3.2
	 */
	boolean required() default true;
}

源碼注解的較為詳細：

默認值為true，在并沒有正文內容的情況下引發(fā)異常。

如果希望在正文內容為null時傳遞null，請將其切換為false。

源碼報錯位置：

RequestResponseBodyMethodProcessor

protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter parameter,
		Type paramType) throws IOException, HttpMediaTypeNotSupportedException, HttpMessageNotReadableException {

	HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
	Assert.state(servletRequest != null, "No HttpServletRequest");
	ServletServerHttpRequest inputMessage = new ServletServerHttpRequest(servletRequest);

	Object arg = readWithMessageConverters(inputMessage, parameter, paramType);
	if (arg == null && checkRequired(parameter)) {
		throw new HttpMessageNotReadableException("Required request body is missing: " +
				parameter.getExecutable().toGenericString(), inputMessage);
	}
	return arg;
}

總結

以上為個人經驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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