springcloud3 GateWay章节-Nacos+gateway（跨域，filter过滤等5

一常用工具类

1.1 结构

1.2 跨域

@Configuration
public class CorsConfig {
    @Bean
    public 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);
    }
}

1.3 filter过滤

1.验证制定请求，是否可以通过。

package com.atguigu.gateway.filter;

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，统一处理会员登录与外部不允许访问的服务
 * </p>
 *
 * @author qy
 * @since 2019-11-21
 */
@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String path = request.getURI().getPath();
        //谷粒学院api接口，校验用户必须登录
        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);
//                }
            }
        }
        //内部服务接口，不允许外部访问
        if(antPathMatcher.match("/**/inner/**", path)) {
            ServerHttpResponse response = exchange.getResponse();
            return out(response);
        }
        return chain.filter(exchange);
    }

    @Override
    public 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", "鉴权失败");
        byte[] bits = message.toString().getBytes(StandardCharsets.UTF_8);
        DataBuffer buffer = response.bufferFactory().wrap(bits);
        //response.setStatusCode(HttpStatus.UNAUTHORIZED);
        //指定编码，否则在浏览器中会中文乱码
        response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
        return response.writeWith(Mono.just(buffer));
    }
}

1.4 异常的处理

1.4.1 异常定义

1.异常配置类

package com.ljf.mscloud.handler;

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;

/**
 * 覆盖默认的异常处理
 *
 * @author yinjihuan
 *
 */
@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;
    }


}

2.异常响应类

package com.ljf.mscloud.handler;

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.web.reactive.function.server.*;

import java.util.HashMap;
import java.util.Map;

/**
 * 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) {
        Map<String, Object> map = new HashMap<>();
        map.put("success", false);
        map.put("code", 20005);
        map.put("message", "网关失败");
        map.put("data", null);
        return map;
    }

    /**
     * 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 int getHttpStatus(Map<String, Object> errorAttributes) {
        return 200;
    }
}