springboot http 自动跳转 https

启用 HTTPS 后，每次都必须输入 HTTPS 前缀，比较麻烦。可以配置 spring boot 自动跳转，实现访问 http 端口自动跳到 HTTPS。增加以下 bean 配置即可。

@Configuration
public class TomcatHttp {
    @Bean
    public Connector connector(){
        Connector connector=new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        connector.setPort(80);
        connector.setSecure(false);
        connector.setRedirectPort(443);
        return connector;
    }

    @Bean
    public TomcatServletWebServerFactory tomcatServletWebServerFactory(Connector connector){
        TomcatServletWebServerFactory tomcat=new TomcatServletWebServerFactory(){
            @Override
            protected void postProcessContext(Context context) {
                SecurityConstraint securityConstraint=new SecurityConstraint();
                securityConstraint.setUserConstraint("CONFIDENTIAL");
                SecurityCollection collection=new SecurityCollection();
                collection.addPattern("/*");
                securityConstraint.addCollection(collection);
                context.addConstraint(securityConstraint);
            }
        };
        tomcat.addAdditionalTomcatConnectors(connector);
        return tomcat;
    }
}