spring boot配置https

證書生成：

keytool -genkey -alias tomcat -storetype PKCS12 -keyalg RSA -keysize 2048 -keystore keystore.p12 -validity 3650

項目配置（yml）：

server:
  port: 8443
  ssl: 
    key-store: classpath:keystore.p12
    key-store-password: java1234
    keyStoreType: PKCS12

    keyAlias: tomcat

HTTP自動轉向HTTPS(這兩個必須放在入口類裏面)

    @Bean
    public EmbeddedServletContainerFactory servletContainer() {
        TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory() {
            @Override
            protected void postProcessContext(Context context) {
                SecurityConstraint constraint = new SecurityConstraint();
                constraint.setUserConstraint("CONFIDENTIAL");
                SecurityCollection collection = new SecurityCollection();
                collection.addPattern("/*");
                constraint.addCollection(collection);
                context.addConstraint(constraint);
            }
        };
        tomcat.addAdditionalTomcatConnectors(httpConnector());
        return tomcat;
    }

    @Bean
    public Connector httpConnector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        //Connector監聽的http的端口號
        connector.setPort(8080);
        connector.setSecure(false);
        //監聽到http的端口號後轉向到的https的端口號
        connector.setRedirectPort(8443);
        return connector;
    }