@[TOC](Springboot及Spring Cloud Gateway自定义异常处理类全局返回错误JSON字符串400&500错误等)

一、Springboot全局错误处理方法

1.在application.yml中配置如下

spring:
    #没有绑定的url直接抛出错误
    throw-exception-if-no-handler-found: true
  resources:
    #不为静态文件建立映射
    add-mappings: false
2.自定义一个异常处理类AllExceptionHandler
package com.sendi.exception;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
@RestControllerAdvice
public class AllExceptionHandler {
	private static Logger logger = LoggerFactory.getLogger(AllExceptionHandler.class);
    @ExceptionHandler(value = Exception.class)
    public Msg defaultErrorHandler(Exception e) {
        logger.error("AllExceptionHandler ", e);
        if (e instanceof org.springframework.web.servlet.NoHandlerFoundException) {
            //404 Not Found
            return new Msg(404, e.toString());
        } else {
            //500
            return new Msg(500, e.toString());
package com.sendi.exception;
public class Msg {
     * 返回码
    private int resultCode;
     * 备注信息
    private String info;
     * 空构造函数
    public Msg() {
     * 自定义消息
     * @param resultCode resultCode
     * @param info       info
    public Msg(int resultCode, String info) {
        this.resultCode = resultCode;
        this.info = info;
    public int getResultCode() {
		return resultCode;
	public void setResultCode(int resultCode) {
		this.resultCode = resultCode;
	public String getInfo() {
		return info;
	public void setInfo(String info) {
		this.info = info;
二、Spring Cloud Gateway全局错误处理方法
Spring Cloud Gateway中的全局异常处理不能直接用@ControllerAdvice来处理，需要对异常信息进行处理，返回JSON格式的数据给客户端。下面为实现的代码，具体步骤如下：
1.自定义异常处理逻辑
package cn.gzsendi.modules.framework.exception;
import java.util.HashMap;
import java.util.Map;
import org.springframework.boot.autoconfigure.web.ErrorProperties;
import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.reactive.error.DefaultErrorWebExceptionHandler;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.context.ApplicationContext;
import org.springframework.http.HttpStatus;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
 * 自定义异常处理
 * <p>异常时用JSON代替HTML异常信息<p>
 * @author yinjihuan
public class JsonExceptionHandler extends DefaultErrorWebExceptionHandler {
	public JsonExceptionHandler(ErrorAttributes errorAttributes, ResourceProperties resourceProperties,
			ErrorProperties errorProperties, ApplicationContext applicationContext) {
		super(errorAttributes, resourceProperties, errorProperties, applicationContext);
	 * 获取异常属性
	@Override
	protected Map<String, Object> getErrorAttributes(ServerRequest request, boolean includeStackTrace) {
		int code = 500;
		Throwable error = super.getError(request);
		if (error instanceof org.springframework.cloud.gateway.support.NotFoundException) {
			code = 404;
		return response(code, this.buildMessage(request, error));
	 * 指定响应处理方法为JSON处理的方法
	 * @param errorAttributes
	@Override
	protected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) {
		return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);
	 * 根据code获取对应的HttpStatus
	 * @param errorAttributes
	@Override
	protected HttpStatus getHttpStatus(Map<String, Object> errorAttributes) {
		int statusCode = (int) errorAttributes.get("code");
		return HttpStatus.valueOf(statusCode);
	 * 构建异常信息
	 * @param request
	 * @param ex
	 * @return
	private String buildMessage(ServerRequest request, Throwable ex) {
		StringBuilder message = new StringBuilder("Failed to handle request [");
		message.append(request.methodName());
		message.append(" ");
		message.append(request.uri());
		message.append("]");
		if (ex != null) {
			message.append(": ");
			message.append(ex.getMessage());
		return message.toString();
	 * 构建返回的JSON数据格式
	 * @param status		状态码
	 * @param errorMessage  异常信息
	 * @return
	public static Map<String, Object> response(int status, String errorMessage) {
		Map<String, Object> map = new HashMap<>();
		map.put("code", status);
		map.put("message", errorMessage);
		map.put("data", null);
		return map;
2.通过Configration覆盖默认的配置
package cn.gzsendi.config;
import java.util.Collections;
import java.util.List;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.web.reactive.result.view.ViewResolver;
import cn.gzsendi.modules.framework.exception.JsonExceptionHandler;
 * 覆盖默认的异常处理
 * @author yinjihuan
@Configuration
@EnableConfigurationProperties({ServerProperties.class, ResourceProperties.class})
public class ErrorHandlerConfiguration {
    private final ServerProperties serverProperties;
    private final ApplicationContext applicationContext;
    private final ResourceProperties resourceProperties;
    private final List<ViewResolver> viewResolvers;
    private final ServerCodecConfigurer serverCodecConfigurer;
    public ErrorHandlerConfiguration(ServerProperties serverProperties,
                                     ResourceProperties resourceProperties,
                                     ObjectProvider<List<ViewResolver>> viewResolversProvider,
                                     ServerCodecConfigurer serverCodecConfigurer,
                                     ApplicationContext applicationContext) {
        this.serverProperties = serverProperties;
        this.applicationContext = applicationContext;
        this.resourceProperties = resourceProperties;
        this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);
        this.serverCodecConfigurer = serverCodecConfigurer;
    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public ErrorWebExceptionHandler errorWebExceptionHandler(ErrorAttributes errorAttributes) {
        JsonExceptionHandler exceptionHandler = new JsonExceptionHandler(
                errorAttributes, 
                this.resourceProperties,
                this.serverProperties.getError(), 
                this.applicationContext);
        exceptionHandler.setViewResolvers(this.viewResolvers);
        exceptionHandler.setMessageWriters(this.serverCodecConfigurer.getWriters());
        exceptionHandler.setMessageReaders(this.serverCodecConfigurer.getReaders());
        return exceptionHandler;
注：本篇内容参考：
www.jianshu.com/p/a5308ba4c…
www.cnblogs.com/yinjihuan/p…