创建SpringCloudGateWay

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

<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>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.8.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.atguigu.gulimallgroupId>
    <artifactId>gulimall-gatewayartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>gulimall-gatewayname>
    <description>API网关description>
    <properties>
        <java.version>1.8java.version>
        <spring-cloud.version>Greenwich.SR3spring-cloud.version>
    properties>
    <dependencies>
        
        <dependency>
            <groupId>com.atguigu.gulimallgroupId>
            <artifactId>gulimall-commonartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-gatewayartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>

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

project>

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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);
    }

}
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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

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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

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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
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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

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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)：