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Spring Cloud Gateway的全局异常处理
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Spring Cloud Gateway的全局异常处理
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Spring Cloud Gateway中的全局异常处理不能直接用@ControllerAdvice来处理,通过跟踪异常信息的抛出,找到对应的源码,自定义一些处理逻辑来符合业务的需求。
网关都是给接口做代理转发的,后端对应的都是REST API,返回数据格式都是JSON。如果不做处理,当发生异常时,Gateway默认给出的错误信息是页面,不方便前端进行异常处理。
需要对异常信息进行处理,返回JSON格式的数据给客户端。下面先看实现的代码,后面再跟大家讲下需要注意的地方。
自定义异常处理逻辑:
package com.cxytiandi.gateway.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*/@Overrideprotected 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*/@Overrideprotected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) { return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);} /*** 根据code获取对应的HttpStatus* @param errorAttributes*/@Overrideprotected 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;}}覆盖默认的配置:
package com.cxytiandi.gateway.exception;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;/*** 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;}}注意点
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异常时如何返回JSON而不是HTML?
在org.springframework.boot.autoconfigure.web.reactive.error.DefaultErrorWebExceptionHandler中的getRoutingFunction()方法就是控制返回格式的,原代码如下:
@Override protected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) { return RouterFunctions.route(acceptsTextHtml(), this::renderErrorView).andRoute(RequestPredicates.all(), this::renderErrorResponse); }这边优先是用HTML来显示的,想用JSON的改下就可以了,如下:
protected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) { return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse); }-
getHttpStatus需要重写
原始的方法是通过status来获取对应的HttpStatus的,代码如下:
protected HttpStatus getHttpStatus(Map<String, Object> errorAttributes) { int statusCode = (int) errorAttributes.get("status"); return HttpStatus.valueOf(statusCode); }如果我们定义的格式中没有status字段的话,这么就会报错,找不到对应的响应码,要么返回数据格式中增加status子段,要么重写,我这边返回的是code,所以要重写,代码如下:
@Override protected HttpStatus getHttpStatus(Map<String, Object> errorAttributes) { int statusCode = (int) errorAttributes.get("code"); return HttpStatus.valueOf(statusCode); } 《新程序员》:云原生和全面数字化实践50位技术专家共同创作,文字、视频、音频交互阅读总结
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