【发布时间】：2023-03-22 20:44:01
【问题描述】：
我正在学习 api 网关技术netflix zuul。我弄清楚了所有事情，并且能够使用zuul 代理网址路由我的api。以下是我的代码：
主类
package com.example.springbootzuulgatwayproxy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import com.example.springbootzuulgatwayproxy.filters.ErrorFilter;
import com.example.springbootzuulgatwayproxy.filters.PostFilter;
import com.example.springbootzuulgatwayproxy.filters.PreFilter;
import com.example.springbootzuulgatwayproxy.filters.RouteFilter;
@SpringBootApplication
@EnableZuulProxy
public class SpringBootZuulgatwayproxyApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootZuulgatwayproxyApplication.class, args);
}
@Bean
public PreFilter preFilter() {
return new PreFilter();
}
@Bean
public PostFilter postFilter() {
return new PostFilter();
}
@Bean
public ErrorFilter errorFilter() {
return new ErrorFilter();
}
@Bean
public RouteFilter routeFilter() {
return new RouteFilter();
}
}
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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>spring-boot-zuulgatwayproxy</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-boot-zuulgatwayproxy</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Dalston.SR2</spring-cloud.version>
</properties>
<dependencies>
<!-- <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency> -->
<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId>
</dependency> -->
<dependency>
<groupId>commons-configuration</groupId>
<artifactId>commons-configuration</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
</dependency>
<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-rest</artifactId>
</dependency> <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>
</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>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
application.properties
zuul.routes.employee.url=http://localhost:8090
zuul.routes.employee2.url=http://localhost:8090
server.port=8080
然后有 4 个过滤器类（Pre、Route、Post 和 Error）都扩展 ZuulFilter 类。
一切正常。但现在的要求是，application.properties 文件中的所有zuul.routes.[entity].url 字段必须从数据库中加载，以及它们的url 值。我怎样才能达到这个要求。请指教。我已经尝试使用类似的键预填充/更新 application.properties 文件。能够更新/写入 application.properties 文件，但实际效果不会在运行时发生。我应该怎么做才能将属性文件中定义的那些路由键设置为从 mysql 数据库动态加载。
【问题讨论】：
标签： java spring netflix-zuul spring-cloud-netflix api-gateway