Support declarativeBinding mode in DataBinder

Closes gh-30948

spring-web/src/main/java/org/springframework/web/bind/ServletRequestDataBinder.java

@@ -140,6 +140,9 @@ public class ServletRequestDataBinder extends WebDataBinder {
 	 * @see #bind(org.springframework.beans.PropertyValues)
 	 */
 	public void bind(ServletRequest request) {
+		if (shouldNotBindPropertyValues()) {
+			return;
+		}
 		MutablePropertyValues mpvs = new ServletRequestParameterPropertyValues(request);
 		MultipartRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartRequest.class);
 		if (multipartRequest != null) {

spring-web/src/main/java/org/springframework/web/bind/support/ConfigurableWebBindingInitializer.java

@@ -44,6 +44,9 @@ public class ConfigurableWebBindingInitializer implements WebBindingInitializer
 
 	private boolean directFieldAccess = false;
 
+	@Nullable
+	private Boolean declarativeBinding;
+
 	@Nullable
 	private MessageCodesResolver messageCodesResolver;
 
@@ -99,6 +102,23 @@ public class ConfigurableWebBindingInitializer implements WebBindingInitializer
 		return this.directFieldAccess;
 	}
 
+	/**
+	 * Set whether to bind only fields intended for binding as described in
+	 * {@link org.springframework.validation.DataBinder#setDeclarativeBinding}.
+	 * @since 6.1
+	 */
+	public void setDeclarativeBinding(boolean declarativeBinding) {
+		this.declarativeBinding = declarativeBinding;
+	}
+
+	/**
+	 * Return whether to bind only fields intended for binding.
+	 * @since 6.1
+	 */
+	public boolean isDeclarativeBinding() {
+		return (this.declarativeBinding != null ? this.declarativeBinding : false);
+	}
+
 	/**
 	 * Set the strategy to use for resolving errors into message codes.
 	 * Applies the given strategy to all data binders used by this controller.
@@ -197,6 +217,9 @@ public class ConfigurableWebBindingInitializer implements WebBindingInitializer
 		if (this.directFieldAccess) {
 			binder.initDirectFieldAccess();
 		}
+		if (this.declarativeBinding != null) {
+			binder.setDeclarativeBinding(this.declarativeBinding);
+		}
 		if (this.messageCodesResolver != null) {
 			binder.setMessageCodesResolver(this.messageCodesResolver);
 		}

spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java

@@ -93,6 +93,9 @@ public class WebExchangeDataBinder extends WebDataBinder {
 	 * @return a {@code Mono<Void>} that completes when binding is complete
 	 */
 	public Mono<Void> bind(ServerWebExchange exchange) {
+		if (shouldNotBindPropertyValues()) {
+			return Mono.empty();
+		}
 		return getValuesToBind(exchange)
 				.doOnNext(map -> doBind(new MutablePropertyValues(map)))
 				.then();

spring-web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java

@@ -138,6 +138,9 @@ public class WebRequestDataBinder extends WebDataBinder {
 	 * @see #bind(org.springframework.beans.PropertyValues)
 	 */
 	public void bind(WebRequest request) {
+		if (shouldNotBindPropertyValues()) {
+			return;
+		}
 		MutablePropertyValues mpvs = new MutablePropertyValues(request.getParameterMap());
 		if (request instanceof NativeWebRequest nativeRequest) {
 			MultipartRequest multipartRequest = nativeRequest.getNativeRequest(MultipartRequest.class);