直接上代码，一共需要写3个类：

处理json异常消息的类：

import org.reactivestreams.Publisher;
import org.springframework.core.ResolvableType;
import org.springframework.http.MediaType;
import org.springframework.http.ReactiveHttpOutputMessage;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.lang.NonNull;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Mono;import java.util.Collections;
import java.util.List;
import java.util.Map;/*** @author itning* @date 2019/4/29 19:07*/
@Component
public class JsonHttpMessageWriter implements HttpMessageWriter<Map<String, Object>> {@NonNull@Overridepublic List<MediaType> getWritableMediaTypes() {return Collections.singletonList(MediaType.APPLICATION_JSON_UTF8);}@Overridepublic boolean canWrite(@NonNull ResolvableType elementType, MediaType mediaType) {return MediaType.APPLICATION_JSON.includes(mediaType);}@NonNull@Overridepublic Mono<Void> write(@NonNull Publisher<? extends Map<String, Object>> inputStream,@NonNull ResolvableType elementType,MediaType mediaType,@NonNull ReactiveHttpOutputMessage message,@NonNull Map<String, Object> hints) {return Mono.from(inputStream).flatMap(m -> message.writeWith(Mono.just(message.bufferFactory().wrap(transform2Json(m).getBytes()))));}private String transform2Json(Map<String, Object> sourceMap) {return "{" +"\"code\":" +sourceMap.getOrDefault("code", 500) +"," +"\"msg\":\"" +sourceMap.getOrDefault("msg", "") +"\"," +"\"data\":\"" +sourceMap.getOrDefault("data", "") +"\"}";}
}
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设置错误消息Map集合：

import org.springframework.boot.web.reactive.error.DefaultErrorAttributes;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.server.ResponseStatusException;import java.util.LinkedHashMap;
import java.util.Map;/*** @author itning* @date 2019/4/29 18:11*/
@Component
public class GlobalErrorAttributes extends DefaultErrorAttributes {@Overridepublic Map<String, Object> getErrorAttributes(ServerRequest request, boolean includeStackTrace) {Throwable error = getError(request);if (error instanceof ResponseStatusException) {ResponseStatusException responseStatusException = (ResponseStatusException) error;Map<String, Object> errorAttributes = new LinkedHashMap<>();errorAttributes.put("code", responseStatusException.getStatus().value());errorAttributes.put("msg", responseStatusException.getMessage());errorAttributes.put("data", "");return errorAttributes;} else {Map<String, Object> errorAttributes = super.getErrorAttributes(request, includeStackTrace);errorAttributes.put("code", errorAttributes.getOrDefault("status", 404));errorAttributes.put("msg", error.getMessage());errorAttributes.put("data", "");return errorAttributes;}}
}
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错误处理：

import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.context.ApplicationContext;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.*;
import reactor.core.publisher.Mono;import java.util.Collections;
import java.util.Map;/*** @author itning* @date 2019/4/29 18:13*/
@Component
@Order(-2)
public class GlobalErrorWebExceptionHandler extends AbstractErrorWebExceptionHandler {public GlobalErrorWebExceptionHandler(JsonHttpMessageWriter jsonHttpMessageWriter,ErrorAttributes errorAttributes,ResourceProperties resourceProperties,ApplicationContext applicationContext) {super(errorAttributes, resourceProperties, applicationContext);setMessageWriters(Collections.singletonList(jsonHttpMessageWriter));}@Overrideprotected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) {return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);}private Mono<ServerResponse> renderErrorResponse(ServerRequest request) {Map<String, Object> errorPropertiesMap = getErrorAttributes(request, false);return ServerResponse.status(Integer.valueOf(errorPropertiesMap.getOrDefault("code", 500).toString())).contentType(MediaType.APPLICATION_JSON_UTF8).body(BodyInserters.fromObject(errorPropertiesMap));}
}
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