Spring Cloud Alibaba 路由网关(Gateway，调用不同的服务配置，网关全局过滤）

1.服务一nacos-provider2.pom.xml<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="h

小石潭记丶

6029人浏览 · 2020-05-24 09:43:42

小石潭记丶 · 2020-05-24 09:43:42 发布

****************服务一nacos-provider***************https://github.com/ChenXbFrank/nacos-provider

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cxb</groupId>
    <artifactId>springcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos-provider</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>0.9.0.RELEASE</version>
        </dependency>
        <!--远程配置的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-alibaba-nacos-config</artifactId>
            <version>0.9.0.RELEASE</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.bootstrap.yml

spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: 127.0.0.1:8848
        file-extension: yaml
        prefix: nacos-provider
  profiles:
    active: dev

3.PayController

package com.cxb.springcloud.web;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/pay")
public class PayController {

    @GetMapping("/balance")
    public String balance(@RequestParam("id")int id){
        return "获取的价格：" + id;
    }
}

4.ProviderController

package com.cxb.springcloud.web;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
//实现配置的热加载
@RefreshScope
public class ProviderController {

    Logger logger = LoggerFactory.getLogger(ProviderController.class);

    @Value("${username:frank}")
    private String username;

    @Value("${address:china}")
    private String address;

    @RequestMapping("/getInfo")
    public String getInfo() {
        return address + ":"+ username;
    }

    @GetMapping("/hi")
    public String hi(@RequestParam(value = "name",defaultValue = "frank",required = false)String name){
        logger.info("name:{}", name);
        return "hi "+name;
    }
}

5.NacosProviderApplication

package com.cxb.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosProviderApplication.class, args);
    }

}

最后启动服务一即可，注册中心可以查看服务。

************实现服务二nacos-server*****************https://github.com/ChenXbFrank/nacos-server

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <!--这里的版本使用2.3.0一直报错，使用2.0.5就好了-->
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cxb</groupId>
    <artifactId>springcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.0.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.application.properties

server.port=8070
spring.application.name=nacos-server

spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

3.ServerController

package com.cxb.springcloud.web;


import org.springframework.web.bind.annotation.*;

@RestController
public class ServerController {

    @RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
    public String echo(@PathVariable String string) {
        return "hello Nacos Discovery " + string;
    }

    @RequestMapping(value = "/divide", method = RequestMethod.GET)
    public String divide(@RequestParam Integer a, @RequestParam Integer b) {
        return String.valueOf(a / b);
    }
}

4.NacosServerApplication

package com.cxb.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosServerApplication.class, args);
    }

}

最后启动服务二即可，注册中心可以查看服务。

******************通过nacos-gateway服务配置调用服务一、二******************

https://github.com/ChenXbFrank/nacos-gateway

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <!--这里的版本开始是2.3.0，jar一直报错，改为2.0.5就好了-->
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cxb</groupId>
    <artifactId>springcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>nacos-gateway</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.0.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.application.properties

server.port=8085
# 配置 Nacos Server 地址
spring.application.name=nacos-gateway
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
management.endpoints.web.exposure.include=*

# 配置文件中配置 Spring Cloud Gateway 路由
spring.cloud.gateway.routes[0].id=nacos-server-route
# 格式为：lb://应用注册服务名
spring.cloud.gateway.routes[0].uri=lb://nacos-server
spring.cloud.gateway.routes[0].predicates[0].name=Path
# 当http://localhost:8085/nacos/echo/123 接口以nacos开头时，则会自动调用nacos-server服务的接口
spring.cloud.gateway.routes[0].predicates[0].args[pattern]=/server/**
spring.cloud.gateway.routes[0].filters[0]=StripPrefix=1

# 配置路由2
spring.cloud.gateway.routes[1].id=nacos-provider-route
# 格式为：lb://应用注册服务名
spring.cloud.gateway.routes[1].uri=lb://nacos-provider
spring.cloud.gateway.routes[1].predicates[0].name=Path
# 当http://localhost:8085/nacos/echo/123 接口以provider开头时，则会自动调用nacos-provider服务的接口
spring.cloud.gateway.routes[1].predicates[0].args[pattern]=/provider/**
spring.cloud.gateway.routes[1].filters[0]=StripPrefix=1

3.NacosGatewayApplication

package com.cxb.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosGatewayApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosGatewayApplication.class, args);
    }

}

最后启动项目，在服务中心查看。

测试服务：

http://localhost:8085/server/echo/123 调用了服务二的接口

http://localhost:8085/provider/pay/balance?id=100 调用了服务一的接口

http://localhost:8085/provider/getInfo 调用了服务一的其他接口

总结：这里实现途中确实遇到了很多问题，不过大多都是jar依赖等问题，引入maven依赖的时候多注意一下版本。

服务一代码：https://github.com/ChenXbFrank/nacos-provider

服务二代码：https://github.com/ChenXbFrank/nacos-server

gateway代码：https://github.com/ChenXbFrank/nacos-gateway

Spring Cloud Alibaba 网关全局过滤

基于上面的代码修改nacos-gateway，新增 AuthFilter即可。

package com.cxb.springcloud.filter;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Maps;
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.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Map;

/**
 * 鉴权过滤器
 */
@Component
public class AuthFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");

        if (token == null || token.isEmpty()) {
            ServerHttpResponse response = exchange.getResponse();

            // 封装错误信息
            Map<String, Object> responseData = Maps.newHashMap();
            responseData.put("code", 401);
            responseData.put("message", "非法请求");
            responseData.put("cause", "Token is empty");

            try {
                // 将信息转换为 JSON
                ObjectMapper objectMapper = new ObjectMapper();
                byte[] data = objectMapper.writeValueAsBytes(responseData);

                // 输出错误信息到页面
                DataBuffer buffer = response.bufferFactory().wrap(data);
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
                return response.writeWith(Mono.just(buffer));
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }
        return chain.filter(exchange);
    }

    /**
     * 设置过滤器的执行顺序
     *
     * @return
     */
    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

以上只判断了token是否为空，后续根据自己的业务需求进行相应的修改。

测试：http://localhost:8085/server/echo/123 如果不加入token，则会被拦截。

http://localhost:8085/server/echo/123?token=123

加入token的访问正常返回结果。

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