springcloud整合gateway实现网关的示例代码

1.项目目录：

创建项目gateway作为父类

2.代码实现：

父类依赖

​

<parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>2.6.2</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.cxh</groupid>
    <artifactid>gateway</artifactid>
    <version>0.0.1-snapshot</version>
    <name>gateway</name>
    <description>demo project for spring boot</description>
    <packaging>pom</packaging>
    <properties>
        <java.version>8</java.version>
        <spring-cloud-alibaba-dependencies.version>2021.1</spring-cloud-alibaba-dependencies.version>
        <spring-cloud-dependencies.version>2021.0.0</spring-cloud-dependencies.version>
    </properties>

    <dependencymanagement>
        <dependencies>
            <dependency>
                <groupid>org.springframework.cloud</groupid>
                <artifactid>spring-cloud-dependencies</artifactid>
                <version>${spring-cloud-dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupid>com.alibaba.cloud</groupid>
                <artifactid>spring-cloud-alibaba-dependencies</artifactid>
                <version>${spring-cloud-alibaba-dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencymanagement>

​

创建module项目gateway-client

添加依赖

<parent>
        <groupid>com.cxh</groupid>
        <artifactid>gateway</artifactid>
        <version>0.0.1-snapshot</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.cxh</groupid>
    <artifactid>gateway-client</artifactid>
    <version>0.0.1-snapshot</version>
    <name>gateway-client</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</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>

        <!--服务注册-->
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
            <version>0.2.1.release</version>
        </dependency>
        <!--服务调用-->
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-openfeign</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>

    </dependencies>

yml配置

server:
  port: 8002

spring:
  application:
    name: gateway-client #服务名
  profiles:
    active: dev #环境设置
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848 #nacos服务注册

控制层

@restcontroller
public class clientcontroller {

    @value("${server.port}")
    private string port;

    @requestmapping("/index")
    public string index(){
        return "gateway-client端口：" + port;
    }
}

启动类添加注解

@springbootapplication
@enablediscoveryclient
public class gatewayclientapplication {

    public static void main(string[] args) {
        springapplication.run(gatewayclientapplication.class, args);
    }

}

创建module项目gateway-service

添加依赖

<parent>
        <groupid>com.cxh</groupid>
        <artifactid>gateway</artifactid>
        <version>0.0.1-snapshot</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.cxh</groupid>
    <artifactid>gateway-service</artifactid>
    <version>0.0.1-snapshot</version>
    <name>gateway-service</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</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-gateway</artifactid>
            <version>3.0.4</version>
        </dependency>
        <!--服务注册/发现中心依赖-->
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
        </dependency>

        <!--服务的配置中心依赖-->
        <dependency>
            <groupid>com.alibaba.cloud</groupid>
            <artifactid>spring-cloud-starter-alibaba-nacos-config</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-feign</artifactid>
            <version>1.4.3.release</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-loadbalancer</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.cloud</groupid>
            <artifactid>spring-cloud-starter-netflix-hystrix</artifactid>
            <version>2.2.10.release</version>
        </dependency>


    </dependencies>

yml配置

server:
  port: 8001

spring:
  application:
    name: gateway-service #服务名
  profiles:
    active: dev #环境设置
  cloud:
    gateway:
      routes:
        # 透传服务
        - id: gateway-client #设置路由id
          uri: lb://gateway-client  #设置路由的url lb://nacos服务注册名称
          predicates:
            - path=/client/** #路径匹配规则
          filters:
            - stripprefix=1

跨域配置

@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);
    }
}

3.实现效果：

启动nacos后，再启动gateway-client, gateway-service项目，打开浏览器http://localhost:8001/client/index

返回信息：gateway-client端口：8002

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