網關解決跨域問題

創建配置類

@Configuration public class CorsConfig {@Beanpublic CorsWebFilter corsFilter() {CorsConfiguration config = new CorsConfiguration();config.addAllowedMethod("*");config.addAllowedOrigin("*");config.addAllowedHeader("*");UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());source.registerCorsConfiguration("/**", config);return new CorsWebFilter(source);} }

全局Filter，統一處理會員登錄與外部不允許訪問的服務

import com.google.gson.JsonObject; import org.springframework.cloud.gateway.filter.GatewayFilterChain; import org.springframework.cloud.gateway.filter.GlobalFilter; import org.springframework.core.Ordered; import org.springframework.core.io.buffer.DataBuffer; import org.springframework.http.server.reactive.ServerHttpRequest; import org.springframework.http.server.reactive.ServerHttpResponse; import org.springframework.stereotype.Component; import org.springframework.util.AntPathMatcher; import org.springframework.web.server.ServerWebExchange; import reactor.core.publisher.Mono;import java.nio.charset.StandardCharsets; import java.util.List;/*** <p>* 全局Filter，統一處理會員登錄與外部不允許訪問的服務* </p>*/ @Component public class AuthGlobalFilter implements GlobalFilter, Ordered {private AntPathMatcher antPathMatcher = new AntPathMatcher();@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {ServerHttpRequest request = exchange.getRequest();String path = request.getURI().getPath();//谷粒學院api接口，校驗用戶必須登錄if(antPathMatcher.match("/api/**/auth/**", path)) {List<String> tokenList = request.getHeaders().get("token");if(null == tokenList) {ServerHttpResponse response = exchange.getResponse();return out(response);} else { // Boolean isCheck = JwtUtils.checkToken(tokenList.get(0)); // if(!isCheck) {ServerHttpResponse response = exchange.getResponse();return out(response); // }}}//內部服務接口，不允許外部訪問if(antPathMatcher.match("/**/inner/**", path)) {ServerHttpResponse response = exchange.getResponse();return out(response);}return chain.filter(exchange);}@Overridepublic int getOrder() {return 0;}private Mono<Void> out(ServerHttpResponse response) {JsonObject message = new JsonObject();message.addProperty("success", false);message.addProperty("code", 28004);message.addProperty("data", "鑒權失敗");byte[] bits = message.toString().getBytes(StandardCharsets.UTF_8);DataBuffer buffer = response.bufferFactory().wrap(bits);//response.setStatusCode(HttpStatus.UNAUTHORIZED);//指定編碼，否則在瀏覽器中會中文亂碼response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");return response.writeWith(Mono.just(buffer));} }

自定義異常處理

服務網關調用服務時可能會有一些異常或服務不可用，它返回錯誤信息不友好，需要我們覆蓋處理

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 java.util.Collections; import java.util.List;/*** 覆蓋默認的異常處理**/ @Configuration @EnableConfigurationProperties({ServerProperties.class, ResourceProperties.class}) public class ErrorHandlerConfig {private final ServerProperties serverProperties;private final ApplicationContext applicationContext;private final ResourceProperties resourceProperties;private final List<ViewResolver> viewResolvers;private final ServerCodecConfigurer serverCodecConfigurer;public ErrorHandlerConfig(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;} } 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.*;import java.util.HashMap; import java.util.Map;/*** 自定義異常處理** <p>異常時用JSON代替HTML異常信息<p>**/ public class JsonExceptionHandler extends DefaultErrorWebExceptionHandler {public JsonExceptionHandler(ErrorAttributes errorAttributes, ResourceProperties resourceProperties,ErrorProperties errorProperties, ApplicationContext applicationContext) {super(errorAttributes, resourceProperties, errorProperties, applicationContext);}/*** 獲取異常屬性*/@Overrideprotected Map<String, Object> getErrorAttributes(ServerRequest request, boolean includeStackTrace) {Map<String, Object> map = new HashMap<>();map.put("success", false);map.put("code", 20005);map.put("message", "網關失敗");map.put("data", null);return map;}/*** 指定響應處理方法為JSON處理的方法* @param errorAttributes*/@Overrideprotected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) {return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);}/*** 根據code獲取對應的HttpStatus* @param errorAttributes*/@Overrideprotected HttpStatus getHttpStatus(Map<String, Object> errorAttributes) {return HttpStatus.OK;} }

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總結

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