【动态路由】系统web url整合系列【springcloud-gateway实现】【不改hosts文件版】组件一：多个Eureka路由过滤器

需求

      实现URL web资源整合，实现使用一个web地址访问多个web资源

方案

      本方案使用SpringCloud Gateway实现，不需要在hosts文件加添加域名映射（也不需要定义一系列域名），通过url路径来将请求转发到不同的Web资源

      如：http://${proxyIP}:${proxyPORT}/nacos1 

             转发到

             http://${nacos1IP}:${nacos1PORT}     

1、优点

• 不需要用户端修改hosts文件（或是域名服务支持）

2、缺点

• session信息可能会生产覆盖，存在session失效和横向越权风险

小知识：

        浏览器的session是按ip+端口（或域名+端口）作为唯一key存的

环境

spring-cloud 2024.0.0

spring-cloud gateway 4.2.0

实现代码

pom

<?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 http://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>
        <!-- 3.4.0  3.3.6  3.1.5  3.0.12  -->
        <version>3.4.0</version>
        <!--  lookup parent from repository  -->
        <relativePath/>
    </parent>

    <groupId>person.daizd</groupId>
    <artifactId>gwproxy</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!-- 统一管理jar包版本 -->
    <properties>
        <java.version>17</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>

        <!--   3.4.0   3.3.6  -->
        <spring-boot.version>3.4.0</spring-boot.version>
        <!-- 2024.0.0   2023.0.4    -->
        <spring-cloud.version>2024.0.0</spring-cloud.version>
        <!--  2023.0.3.2   2023.0.1.3    2022.0.0.0    2021.1   2021.0.6.1   2021.0.5.0   -->
        <spring-cloud-alibaba.version>2023.0.3.2</spring-cloud-alibaba.version>

        <!--  springcloud 2020.02 以后需要单独引入     4.1.4   4.0.5  3.1.9  3.0.6  -->
        <spring-cloud-starter-bootstrap.version>4.1.4</spring-cloud-starter-bootstrap.version>
        <!-- 0.3.0-RC 适配springboot3    0.2.12 适配springboot2    0.1.10 适配springboot1   -->
        <nacos-config-spring-boot-starter.version>0.3.0-RC</nacos-config-spring-boot-starter.version>

        <!--        <junit.version>5.8.2</junit.version>-->
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.18.28</lombok.version>

        <commons-lang3.version>3.14.0</commons-lang3.version>
        <io.micrometer.version>1.9.17</io.micrometer.version>

        <!--  pmd-core 7.0.0:  3.25.0  3.24.0  3.23.0  3.22.0
              pmd-core 6.55.0:  3.21.2    3.13.0  3.11.0 copote  -->
        <maven-pmd-plugin.version>3.26.0</maven-pmd-plugin.version>
        <maven-clean-plugin.version>3.26.0</maven-clean-plugin.version>
        <fastjson2.version>2.0.53</fastjson2.version>
    </properties>

    <dependencies>
        <!--gateway的依赖 springcloud开发-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
            <version>${spring-cloud-starter-bootstrap.version}</version>
        </dependency>

        <!--   之前工程即没有引入 SpringCloud，也没有引入 SpringCloudAlibaba  -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>${spring-cloud-alibaba.version}</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba.fastjson2</groupId>
            <artifactId>fastjson2</artifactId>
            <version>${fastjson2.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>

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

        <dependency>
            <groupId>io.micrometer</groupId>
            <artifactId>micrometer-registry-prometheus</artifactId>
        </dependency>

        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-resolver-dns-native-macos</artifactId>
            <version>4.1.115.Final</version>
            <classifier>osx-aarch_64</classifier>
        </dependency>


        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.22</version>
<!--            <scope>test</scope>-->
        </dependency>

        <!-- 测试相关 这个包含junit5  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.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.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <optional>true</optional>
            </dependency>

            <dependency>
                <groupId>io.micrometer</groupId>
                <artifactId>micrometer-registry-prometheus</artifactId>
                <version>${io.micrometer.version}</version>
                <scope>compile</scope>
            </dependency>

        </dependencies>

    </dependencyManagement>


    <build>

        <plugins>
            <!-- 用于支持热部署 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>