/**
 * @author wuweifeng wrote on 2018/11/2.
@Configuration
public class ExceptionConfig {
     * 自定义异常处理[@@]注册Bean时依赖的Bean，会从容器中直接获取，所以直接注入即可
    @Primary
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public ErrorWebExceptionHandler errorWebExceptionHandler(ObjectProvider<List<ViewResolver>> viewResolversProvider,
                                                             ServerCodecConfigurer serverCodecConfigurer) {
        JsonExceptionHandler jsonExceptionHandler = new JsonExceptionHandler();
        jsonExceptionHandler.setViewResolvers(viewResolversProvider.getIfAvailable(Collections::emptyList));
        jsonExceptionHandler.setMessageWriters(serverCodecConfigurer.getWriters());
        jsonExceptionHandler.setMessageReaders(serverCodecConfigurer.getReaders());
        return jsonExceptionHandler;
}

package com.maimeng.apigateway.config.exception;
 * @author wuweifeng wrote on 2018/11/2.
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.cloud.gateway.support.NotFoundException;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.util.Assert;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.reactive.result.view.ViewResolver;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 * @classDesc: 统一异常处理, 参考{@link org.springframework.web.server.AbstractErrorWebExceptionHandler}修改
 * @author: chenggang
public class JsonExceptionHandler implements ErrorWebExceptionHandler {
    private static final Logger log = LoggerFactory.getLogger(JsonExceptionHandler.class);
     * MessageReader
    private List<HttpMessageReader<?>> messageReaders = Collections.emptyList();
     * MessageWriter
    private List<HttpMessageWriter<?>> messageWriters = Collections.emptyList();
     * ViewResolvers
    private List<ViewResolver> viewResolvers = Collections.emptyList();
     * 存储处理异常后的信息
    private ThreadLocal<Map<String, Object>> exceptionHandlerResult = new ThreadLocal<>();
     * 参考AbstractErrorWebExceptionHandler
    public void setMessageReaders(List<HttpMessageReader<?>> messageReaders) {
        Assert.notNull(messageReaders, "'messageReaders' must not be null");
        this.messageReaders = messageReaders;
     * 参考AbstractErrorWebExceptionHandler
    public void setViewResolvers(List<ViewResolver> viewResolvers) {
        this.viewResolvers = viewResolvers;
     * 参考AbstractErrorWebExceptionHandler
    public void setMessageWriters(List<HttpMessageWriter<?>> messageWriters) {
        Assert.notNull(messageWriters, "'messageWriters' must not be null");
        this.messageWriters = messageWriters;
    @Override
    public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
        // 按照异常类型进行处理
        HttpStatus httpStatus;
        String body;
        if (ex instanceof NotFoundException) {
            httpStatus = HttpStatus.NOT_FOUND;
            body = "Service Not Found";
        } else if (ex instanceof ResponseStatusException) {
            ResponseStatusException responseStatusException = (ResponseStatusException) ex;
            httpStatus = responseStatusException.getStatus();
            body = responseStatusException.getMessage();
        } else {
            httpStatus = HttpStatus.INTERNAL_SERVER_ERROR;
            body = "Internal Server Error";
        //封装响应体,此body可修改为自己的jsonBody
        Map<String, Object> result = new HashMap<>(2, 1);
        result.put("httpStatus", httpStatus);
        String msg = "{\"code\":" + httpStatus + ",\"message\": \"" + body + "\"}";
        result.put("body", msg);
        //错误记录
        ServerHttpRequest request = exchange.getRequest();
        log.error("[全局异常处理]异常请求路径:{},记录异常信息:{}", request.getPath(), ex.getMessage());
        //参考AbstractErrorWebExceptionHandler
        if (exchange.getResponse().isCommitted()) {
            return Mono.error(ex);
        exceptionHandlerResult.set(result);
        ServerRequest newRequest = ServerRequest.create(exchange, this.messageReaders);
        return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse).route(newRequest)
                .switchIfEmpty(Mono.error(ex))
                .flatMap((handler) -> handler.handle(newRequest))
                .flatMap((response) -> write(exchange, response));
     * 参考DefaultErrorWebExceptionHandler
    protected Mono<ServerResponse> renderErrorResponse(ServerRequest request) {
        Map<String, Object> result = exceptionHandlerResult.get();
        return ServerResponse.status((HttpStatus) result.get("httpStatus"))
                .contentType(MediaType.APPLICATION_JSON_UTF8)
                .body(BodyInserters.fromObject(result.get("body")));
     * 参考AbstractErrorWebExceptionHandler
    private Mono<? extends Void> write(ServerWebExchange exchange,
                                       ServerResponse response) {
        exchange.getResponse().getHeaders()
                .setContentType(response.headers().getContentType());
        return response.writeTo(exchange, new ResponseContext());
     * 参考AbstractErrorWebExceptionHandler
    private class ResponseContext implements ServerResponse.Context {
        @Override
        public List<HttpMessageWriter<?>> messageWriters() {
            return JsonExceptionHandler.this.messageWriters;
        @Override