【Gateway】基于ruoyi-cloud-plus项目，gateway局部过滤器和过滤返回以及集成nacos

1.使用Gateway路由转发

1.1标题引入依赖

   <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-gateway</artifactId>
   </dependency>

1.2添加YML配置

spring:
  cloud:
    gateway:
      # 打印请求日志(自定义)
      requestLog: true
      discovery:
        locator:
          #配置服务名使用小写
          lowerCaseServiceId: true
          #开启服务发现功能，从注册中心获取服务列表，（nacos->服务管理->服务列表）
          #默认服务名称需要为大写，可以通过配置lower-case-service-id: true 改变这一规则
          enabled: true
       #spring cloud gateway提供了XForwardedHeadersFilter，用来决定进行路由转发的时候转发哪些X-Forwarded相关的header，同时提供append选项，用来控制是否是追加还是覆盖到header中。
       #如果spring.cloud.gateway.x-forwarded.for-enabled为true，则会写入X-Forwarded-For
	   #如果spring.cloud.gateway.x-forwarded.proto-enabled为true，则会写入X-Forwarded-Proto
       #如果spring.cloud.gateway.x-forwarded.port-enabled为true，则会写入X-Forwarded-Port
       #如果spring.cloud.gateway.x-forwarded.host-enabled为true，则会写入X-Forwarded-Host
      x-forwarded:
        for-enabled: false
        host-enabled: false
        port-enabled: false
        proto-enabled: false
      routes:
        - id: Test01
          uri: https://127.0.0.1:8080
          predicates:
            - Path=/test01/**
          filters:
            - Test01=true
        - id: Test02
          uri: https://127.0.0.1:8081
          predicates:
            - Path=/test02/**,/test03/**
          filters:
            - Test02=true
        
  # redis 配置
  data:
    redis:
      # 地址
      host: localhost
      # 端口，默认为6379
      port: 6379
      # 数据库索引
      database: 0
      # 密码
      password: yourPassword
      # 连接超时时间
      timeout: 10s
      lettuce:
        pool:
          # 连接池中的最小空闲连接
          min-idle: 0
          # 连接池中的最大空闲连接
          max-idle: 8
          # 连接池的最大数据库连接数
          max-active: 8
          # #连接池最大阻塞等待时间（使用负值表示没有限制）
          max-wait: -1ms    
mybatis-plus:
  # 不支持多包, 如有需要可在注解配置 或 提升扫包等级
  # 例如 com.**.**.mapper
  mapperPackage: org.dromara.gateway.mapper
  # 对应的 XML 文件位置
  mapperLocations: classpath*:mapper/**/*Mapper.xml
  # 实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: org.dromara.**.domain
  global-config:
    dbConfig:
      # 主键类型
      # AUTO 自增 NONE 空 INPUT 用户输入 ASSIGN_ID 雪花 ASSIGN_UUID 唯一 UUID
      # 如需改为自增 需要将数据库表全部设置为自增
      idType: ASSIGN_ID

1.3 自定义过滤器

自定义Test01GatewayFilterFactory 过滤器，过滤上述配置的请求路径携带/test01/** 的请求，并转发到https://127.0.0.1:8080 + 请求路径
例：请求为 http;//127.0.0.1:8088/test01/ceshi 实际转发到 http;//127.0.0.1:8080/test/ceshi
请求参数内部可以下述过滤器内调整

@Component
@Slf4j(topic = "checkToken")
public class Test01GatewayFilterFactory extends AbstractGatewayFilterFactory<Test01GatewayFilterFactory.Param> {


    @Override
    public GatewayFilter apply(Param param) {
        return ((exchange, chain) -> {
            Mono<Void> filter = chain.filter(exchange);
            UserMapper mapper = SpringUtils.getBean( UserMapper.class);
            //这是获取请求头信息
            HttpHeaders headers = exchange.getRequest().getHeaders();
            //这是获取请求参数信息
            //MultiValueMap queryParams = exchange.getRequest().getQueryParams();
            //获取传入的授权信息，用于下面解密获取账号和密码
            String authorization = CustomStringUtil.customTrim(headers.getFirst("Authorization"));
            String id,pwd= null;
            try {
                String[] idAndPwd = new String(Base64.decodeBase64(authorization.substring(6))).split(":");
                id = idAndPwd [0];
                pwd = idAndPwd [1];
            } catch (Exception e) {
                return filter;
            }
            if (StrUtil.isEmpty(id) || StrUtil.isEmpty(pwd) ) {
                return filter;
            }
            User user= mapper.selectOne(new QueryWrapper<User>().lambda().eq(User::getId, id.trim()));
                if(user== null){
                    return filter;
                }
            String key = user.getKey();
            String secret = user.getSecret();
            if (StrUtil.isEmpty(key ) || StrUtil.isEmpty(secret)) {
                return filter;
            }
            //生成真实的授权信息
            String authorizationReal = "Basic " + Base64.encodeBase64String((key + ":" + secret).getBytes());
            ServerHttpRequest newRequest = exchange.getRequest().mutate()
                .header("Authorization", authorizationReal)
                .build();
            ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
            filter = chain.filter(newExchange);
            return filter;
        });
    }
    public Test01GatewayFilterFactory () {
        super(Test01GatewayFilterFactory.Param.class);
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public static class Param {
        private boolean isCheckToken;
    }

自定义过滤返回信息

自定义Test02GatewayFilterFactory 过滤器，过滤上述配置的请求路径携带/test02/** ，/test03/**的请求，并转发到https://127.0.0.1:8081 + 请求路径
例：请求为 http;//127.0.0.1:8088/test02/ceshi或 http;//127.0.0.1:8088/test03/ceshi实际转发到 http;//127.0.0.1:8081/test/ceshi
请求参数内部可以下述过滤器内调整

@Component
@Slf4j(topic = "checkToken")
public class Test02GatewayFilterFactory extends AbstractGatewayFilterFactory<Test02GatewayFilterFactory.Param> {


    @Override
    public GatewayFilter apply(Param param) {
        return ((exchange, chain) -> {
            Mono<Void> filter = chain.filter(exchange);
            UserMapper mapper = SpringUtils.getBean( UserMapper.class);
            //这是获取请求头信息
            HttpHeaders headers = exchange.getRequest().getHeaders();
            //这是获取请求参数信息
            //MultiValueMap queryParams = exchange.getRequest().getQueryParams();
            //获取传入的授权信息，用于下面解密获取账号和密码
            String authorization = CustomStringUtil.customTrim(headers.getFirst("Authorization"));
            String id,pwd= null;
            try {
                String[] idAndPwd = new String(Base64.decodeBase64(authorization.substring(6))).split(":");
                id = idAndPwd [0];
                pwd = idAndPwd [1];
            } catch (Exception e) {
                return filter;
            }
            if (StrUtil.isEmpty(id) || StrUtil.isEmpty(pwd) ) {
                return filter;
            }
            User user= mapper.selectOne(new QueryWrapper<User>().lambda().eq(User::getId, id.trim()));
                if(user== null){
                     ServerHttpResponse response = exchange.getResponse();
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
                String result = getJsonString(token);
                DataBuffer buffer = response.bufferFactory().wrap(result.getBytes(StandardCharsets.UTF_8));
                return response.writeWith(Flux.just(buffer));
                }
            String key = user.getKey();
            String secret = user.getSecret();
            if (StrUtil.isEmpty(key ) || StrUtil.isEmpty(secret)) {
                return filter;
            }
            //生成真实的授权信息
            String authorizationReal = "Basic " + Base64.encodeBase64String((key + ":" + secret).getBytes());
            ServerHttpRequest newRequest = exchange.getRequest().mutate()
                .header("Authorization", authorizationReal)
                .build();
            ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
            filter = chain.filter(newExchange);
            return filter;
        });
    }
    public Test02GatewayFilterFactory () {
        super(Test02GatewayFilterFactory.Param.class);
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public static class Param {
        private boolean isCheckToken;
    }

 //封装成功的token
    public String getJsonString(String token){
        HashMap<String, Object> map = new HashMap<>();
        ArrayList<Map> objects = new ArrayList<>();
        HashMap<String, String> resultMap = new HashMap<>();
        resultMap.put("token",token);
        objects.add(resultMap);
        map.put("status","-1");
        map.put("message","认证失败");
        map.put("result",objects);
        String jsonString = JSONObject.toJSONString(map);
        return jsonString;
    }




public class CustomStringUtil {

    public static String customTrim(String str){
        return Strings.isNullOrEmpty(str) ? str : str.trim();
    }
}