【Spring Web教程】SpringBoot 实现一应用多Tomcat容器

概括

编写反向代理中间件的时候需要一个应用两个Tomcat，具体实现场景如下：

一个虚拟机进程创建两个Tomcat容器：主Tomcat、从Tomcat。
主Tomcat：处理前端应用请求、websocket处理
从Tomcat：占用多个端口、处理多个反向代理请求。
LocalCache：双Tomcat共享数据、WebSocket会话信息

实现

代码结构

pom.xml 引入

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-webartifactId>
dependency>
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App启动类

@Component
public class App {
    public static void main(String[] args) {
        // 主Tomcat
        SpringApplication.run(MasterApp.class, args);
        // 从Tomcat
        System.getProperties().put( "server.port", 8081);
        SpringApplication.run(FollowApp.class, args);
    }
}
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主Tomcat启动类

import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * 主容器
 * @author terry
 * @version 1.0
 * @date 2022/7/27 17:42
 */
@SpringBootApplication
public class MasterApp {
}
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从Tomcat启动类

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

/**
 * 从容器
 * @author terry
 * @version 1.0
 * @date 2022/7/27 17:42
 */
@SpringBootApplication
// @EnableScheduling
public class FollowApp {
}

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共享数据

import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 本地虚拟机缓存（用于双Tomcat共享数据）
 * @author terry
 * @version 1.0
 * @date 2022/7/27 17:45
 */
public class LocalCache {

    public final static Map<Integer, String> portProxy = new ConcurrentHashMap<>();

    public final static BlockingQueue<Integer> portQueue = new ArrayBlockingQueue<>(100);
}
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启动成功打印：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.2)
2022-07-27 18:01:35.790  INFO 18640 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-07-27 18:01:35.805  INFO 18640 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.2)
2022-07-27 18:01:36.883  INFO 18640 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8081 (http)
2022-07-27 18:01:36.884  INFO 18640 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
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