将SpringBoot项目的HTTP站点改为HTTPS的全过程

package com.https.httpsdemo.demos.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@Controller
public class BasicController {

    // http://127.0.0.1:8081/hello
    @GetMapping("/hello")
    @ResponseBody
    public String hello() {
        return "Hello ";
    }
}

server:
  port: 8081

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

# 应用服务 WEB 访问端口
server:
  port: 8081
  ssl:
    # 证书路径，秘钥文件路径，也可以配置绝对路径
    key-store: keystore.p12
    # 证书密码，秘钥生成时在终端输入的秘钥口令
    key-store-password: 123456
    # 秘钥类型，与秘钥生成命令一样
    key-store-type: PKCS12
    # 证书别名，与秘钥生成命令一样
    key-alias: tomcat

package com.https.httpsdemo;

import org.apache.catalina.Context;
import org.apache.catalina.connector.Connector;
import org.apache.tomcat.util.descriptor.web.SecurityCollection;
import org.apache.tomcat.util.descriptor.web.SecurityConstraint;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.Bean;


@SpringBootApplication
public class HttpsDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(HttpsDemoApplication.class, args);
    }
    @Bean
    public ServletWebServerFactory servletContainer() {
        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(redirectConnector());
        return tomcat;
    }

    /**
     * 浏览器访问http://127.0.0.1:8080/hello时，自动跳转到https://127.0.0.1:8081/hello
     * @return
     */
    private Connector redirectConnector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        connector.setPort(8080);
        connector.setSecure(false);
        connector.setRedirectPort(8081);
        return connector;
    }
}