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路由配置信息：使用Spring 5的函数式web框架

/*
 *  Copyright (c) 2019-2020, 冷冷 (wangiegie@gmail.com).
 *  <p>
 *  Licensed under the GNU Lesser General Public License 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 * https://www.gnu.org/licenses/lgpl.html
 *  <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.smartdata.gateway.config;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
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 com.smartdata.gateway.handler.HystrixFallbackHandler;
import com.smartdata.gateway.handler.ImageCodeHandler;

/**
 * @author heluwei
 * @date 2019/2/1
 * 路由配置信息
 */
@Slf4j
@Configuration
@AllArgsConstructor //使用后添加一个构造函数，该构造函数含有所有已声明字段属性参数
public class RouterFunctionConfiguration {
    private final HystrixFallbackHandler hystrixFallbackHandler;
    private final ImageCodeHandler imageCodeHandler;

    @Bean
    public RouterFunction routerFunction() {
        return RouterFunctions.route(
            RequestPredicates.path("/fallback")
                .and(RequestPredicates.accept(MediaType.TEXT_PLAIN)), hystrixFallbackHandler)
            .andRoute(RequestPredicates.GET("/code")
                .and(RequestPredicates.accept(MediaType.TEXT_PLAIN)), imageCodeHandler);

    }

}

/*
 *  Copyright (c) 2019-2020, 冷冷 (wangiegie@gmail.com).
 *  <p>
 *  Licensed under the GNU Lesser General Public License 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 * https://www.gnu.org/licenses/lgpl.html
 *  <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.smartdata.gateway.handler;

import com.google.code.kaptcha.Producer;
import com.smartdata.common.core.constant.CommonConstants;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.HandlerFunction;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * @author lengleng
 * @date 2019/2/1
 * 验证码生成逻辑处理类
 */
@Slf4j
@Component
@AllArgsConstructor
public class ImageCodeHandler implements HandlerFunction<ServerResponse> {
    private final Producer producer;  //google的验证码生成工具
    private final RedisTemplate redisTemplate;

    @Override
    public Mono<ServerResponse> handle(ServerRequest serverRequest) {
        //生成验证码
        String text = producer.createText();
        BufferedImage image = producer.createImage(text);

        //保存验证码信息，保存到redis中。key:DEFAULT_CODE_KEY 时间是60
        String randomStr = serverRequest.queryParam("randomStr").get();
        redisTemplate.opsForValue().set(CommonConstants.DEFAULT_CODE_KEY + randomStr, text, 60, TimeUnit.SECONDS);

        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpeg", os);
        } catch (IOException e) {
            log.error("ImageIO write err", e);
            return Mono.error(e);
        }

        return ServerResponse
            .status(HttpStatus.OK)
            .contentType(MediaType.IMAGE_JPEG)
            .body(BodyInserters.fromResource(new ByteArrayResource(os.toByteArray())));
    }
}

/*
 *  Copyright (c) 2019-2020 (wangiegie@gmail.com).
 *  <p>
 *  Licensed under the GNU Lesser General Public License 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 * https://www.gnu.org/licenses/lgpl.html
 *  <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.smartdata.gateway.handler;

import com.google.code.kaptcha.Producer;
import com.smartdata.common.core.constant.CommonConstants;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.HandlerFunction;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * @author lengleng
 * @date 2019/2/1
 * 验证码生成逻辑处理类
 */
@Slf4j
@Component
@AllArgsConstructor
public class ImageCodeHandler implements HandlerFunction<ServerResponse> {
    private final Producer producer;  //google的验证码生成工具
    private final RedisTemplate redisTemplate;

    @Override
    public Mono<ServerResponse> handle(ServerRequest serverRequest) {
        //生成验证码
        String text = producer.createText();
        BufferedImage image = producer.createImage(text);

        //保存验证码信息，保存到redis中。key:DEFAULT_CODE_KEY 时间是60
        String randomStr = serverRequest.queryParam("randomStr").get();
        redisTemplate.opsForValue().set(CommonConstants.DEFAULT_CODE_KEY + randomStr, text, 60, TimeUnit.SECONDS);

        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpeg", os);
        } catch (IOException e) {
            log.error("ImageIO write err", e);
            return Mono.error(e);
        }

        return ServerResponse
            .status(HttpStatus.OK)
            .contentType(MediaType.IMAGE_JPEG)
            .body(BodyInserters.fromResource(new ByteArrayResource(os.toByteArray())));
    }
}