1. 获取 SSL 证书

Spring Boot 配置SSL证书用百度云的ssl证书来举例，首先从百度云下载下来pfx格式的证书

2.接下来我们在springboot的配置文件里配置一下证书的地址

#服务设定
server:
  # 端口 使用HTTPS默认端口
  port: 443
  #HTTPS加密配置
  ssl:
    #证书路径
    key-store: classpath:xxxxx.pfx
    #证书密码
    key-store-password: xxxx

3.配置输入http的端口，自动跳转到https的路径

package com.tms.tblog;

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.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@SpringBootApplication
@MapperScan("com.tms.tblog.dao")
@EnableWebMvc
public class TBlogApplication {

    public static void main(String[] args) {
        SpringApplication.run(TBlogApplication.class, args);
    }
    /**
     * http 转 https
     */
    @Bean
    public Connector connector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        // 监听的http端口
        connector.setPort(8080);
        connector.setSecure(false);
        // 监听到http端口后跳转的https端口
        connector.setRedirectPort(443);
        return connector;
    }

    /**
     * 拦截所有的请求
     */
    @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;
    }
}

上述配置类将 HTTP 请求（端口 8080）重定向到 HTTPS 请求（端口 8443）。 通过以上步骤，你就可以在 Spring Boot 应用中成功配置 SSL 证书，实现 HTTPS 安全访问。