在spring boot 2.0.0中设置jvmRoute [英] Set jvmRoute in spring boot 2.0.0

问题描述

对于粘性会话，我需要设置嵌入式tomcat的jvmRoute。

For sticky session i need to set the jvmRoute of the embedded tomcat.

实际上只有

System.setProperty("jvmRoute", "node1");

是必需的，但我想设置一个via application.properties可配置属性。我不知道如何以及何时使用@Value注释属性进行设置。

is required, but i want to set a via application.properties configurable property. I don't know how and when to set this with @Value annotated property.

使用@PostConstruct描述这里，它不起作用（至少不在spring boot 2.0.0.RELEASE中）

With @PostConstruct as described here, it does not work (at least not in spring boot 2.0.0.RELEASE)

我到目前为止找到的唯一方法是

The only way i found so far is

    @Component
public class TomcatInitializer implements ApplicationListener<ServletWebServerInitializedEvent> {

    @Value("${tomcat.jvmroute}")
    private String jvmRoute;

    @Override
    public void onApplicationEvent(final ServletWebServerInitializedEvent event) {
        final WebServer ws = event.getApplicationContext().getWebServer();
        if (ws instanceof TomcatWebServer) {
            final TomcatWebServer tws = (TomcatWebServer) ws;
            final Context context = (Context) tws.getTomcat().getHost().findChildren()[0];
            context.getManager().getSessionIdGenerator().setJvmRoute(jvmRoute);
        }
    }
}

它有效，但确实如此看起来不那么优雅...

It works, but it does not look like much elegant...

非常感谢任何建议。

推荐答案

您可以使用上下文自定义程序更优雅地自定义Tomcat的上下文。它是一个功能接口，因此您可以使用lambda：

You can customise Tomcat's Context a little more elegantly by using a context customiser. It's a functional interface so you can use a lambda:

@Bean
public WebServerFactoryCustomizer<TomcatServletWebServerFactory> tomcatCustomizer() {
    return (tomcat) -> tomcat.addContextCustomizers((context) -> {
        Manager manager = context.getManager();
        if (manager == null) {
            manager = new StandardManager();
            context.setManager(manager);
        }
        manager.getSessionIdGenerator().setJvmRoute(jvmRoute);
    });
}

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