创建SpringCloudGateWay

本案例基于尚硅谷《谷粒商城》项目，视频27 创建测试API网关
1、创建module

2、引入依赖

<?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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.atguigu.gulimall</groupId>
    <artifactId>gulimall-gateway</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>gulimall-gateway</name>
    <description>API网关</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
    </properties>
    <dependencies>
        <!--gulimall-common中依赖了服务注册与发现，将网关服务注册到服务中心-->
        <dependency>
            <groupId>com.atguigu.gulimall</groupId>
            <artifactId>gulimall-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </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>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

3、开启服务注册与发现
3.1

@EnableDiscoveryClient//加入该注解
@SpringBootApplication
public class GulimallGatewayApplication {

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

}

3.2 修改application.properties文件，将服务注册到nacos

#配置nacos注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
#服务名称
spring.application.name=gulimall-gateway

3.3
在nacos页面创建网关命名空间


创建配置

创建bootstrap.properties

spring.application.name=gulimall-gateway
#配置中心地址
spring.cloud.nacos.config.server-addr=127.0.0.1:8848
#命名空间id
spring.cloud.nacos.config.namespace=d6130a53-dcca-4e67-888c-a236b16f5f87

3.4

启动类添加排除数据库配置代码(exclude = DataSourceAutoConfiguration.class)

@EnableDiscoveryClient
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class GulimallGatewayApplication {

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

}```

否则项目启动报错：

```xml
***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
	If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
	If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).


Process finished with exit code 1

3.5 配置网关模块的端口号为88

3.6 配置网关地址：
如果请求路径中有qq就跳转到https://www.qq.com
如果请求路径中有baidu,就跳转到https://www.baidu.com
新建一个
application.yml，内容如下

spring:
  cloud:
    gateway:
      routes:
        - id: test_route
          uri: https://www.baidu.com
          predicates:
            - Query=url,baidu

        - id: test_route
          uri: https://www.qq.com
          predicates:
            - Query=url,qq

4、测试如下
浏览器输入地址：
http://localhost:88/hello?url=qq
跳转到(实际访问的地址是 https://www.qq.com/hello 因为qq网址中没有hell)：

浏览器输入地址：
http://localhost:88/hello?url=baidu
跳转如下(实际访问的地址是 https://www.baidu.com/hello 因为百度中也没有包含hell的地址)：