从 Spring 启动运行 Java 类 [英] Run a Java class from Spring startup

问题描述

我使用的是 Java8 和 Spring4.3.1.

I am using Java8 and Spring4.3.1.

我有一个 Java/Spring 应用程序，用于托管浏览器和移动应用程序客户端访问的 RESTfult 服务.其次，我编写了一个聊天服务器来侦听来自客户端的事件 (socket.io).此聊天服务器从类 main 方法运行.

I have a Java/Spring application hosting RESTfult services accessed by browser and mobile app clients. Second, I have written a Chat Server that listens for events (socket.io) from the clients. This Chat Server is running from the classes main method.

Chat Server 类有一个我想要运行的 main 方法，并允许在我的 Spring 应用程序启动时监听事件.这可能吗?

The Chat Server class has a main method that I want to run, and allow to listen for events when my Spring application starts. Is this possible?

如果我自己运行 main，它可以工作，但我希望它在我启动加载 Spring 应用程序的 Wildfly 服务器时启动.

If I run the main myself, it works, but I want it to start up when I start my Wildfly server that loads the Spring application.

或者有更好的方法吗?聊天服务器不应该从 main 方法运行吗?

Or is there a better approach? Should the Chat Server not be running from the main method?

我有以下代码:

package com.jobs.spring.configuration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class WebAppInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(AppConfig.class);
        ctx.setServletContext(servletContext);
        Dynamic dynamic = servletContext.addServlet("rest", new DispatcherServlet(ctx));
        dynamic.addMapping("/*");
        dynamic.setLoadOnStartup(1);

        try {
            com.jobs.spring.chat.Server chatServer = new com.jobs.spring.chat.Server();
            chatServer.run(null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

和

public class Server implements CommandLineRunner {

    private static final String SERVER = "localhost";
    private static final Integer PORT = 3700;

    @Override
    public void run(String... args) throws Exception {
        main(args);
    }

    public static void main(String[] args) {
...

并得到以下错误:

18:47:08,142 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 66) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./jbosswildfly: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./jbosswildfly: java.lang.NoClassDefFoundError: Failed to link com/jobs/spring/chat/Server (Module "deployment.jbosswildfly.war:main" from Service Module Loader): org/springframework/boot/CommandLineRunner

Caused by: java.lang.NoClassDefFoundError: Failed to link com/jobs/spring/chat/Server (Module "deployment.jbosswildfly.war:main" from Service Module Loader): org/springframework/boot/CommandLineRunner

推荐答案

您可以在 Wildfly 中部署您的聊天服务器，通过扩展 SpringBootServletInitializer，而不是从main.

You could deploy your chat server in Wildfly, by extending SpringBootServletInitializer, instead of launching it from a main.

文档:howto-create-a-deployable-war-file

@SpringBootApplication
public class SpringBootApp extends SpringBootServletInitializer{

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(SpringBootApp.class);
    }

    //public static void main(String[] args){
    //    new SpringApplicationBuilder()
    //    .sources(SpringBootApp.class)
    //    .run(args);
    //}
}

将生成的artifact改为war，在wildfly中正常部署:

Change the artifact produced to war, and deploy it normally in wildfly:

<project>
    <packaging>war</packaging>
    ...
<project>

<小时>

你可能需要排除tomcat，它是用spring-boot-starter-web自动导入的:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>

Spring 为 Wildfly 提供了一个 pom.xml 的 Spring Boot 示例:spring-boot-deployment-test-wildfly

Spring provided a Spring Boot example of a pom.xml for wildfly: spring-boot-deployment-test-wildfly

这篇关于从 Spring 启动运行 Java 类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！