SpringBoot2 配置https访问

1.生成证书，可以使自签名或者从SSL证书授权中心获得的。

JDK中keytool是一个证书管理工具，可以生成自签名证书。 
生成命令如下(找不到keytoo命令的先去配置java环境) 
我指定的名字叫tomcat.keystore 别名叫tomcat，密码自己设置，我这里用的tomcat，最后那个直接按得回车

keytool -genkey -alias tomcat -keyalg RSA -keystore D:/tomcat.keystore

2.SpringBoot配置SSL

将这个tomcat.keystore拷贝到项目根目录下（项目根目录，比如我的idea项目叫meatball-parent,然后这里我这个module叫meatball-admin，所以我们的证书应该放在meatball-parent下） 

3.让后配置application.yml

server: 
  port: 443 #配置端口号
  #port: 12580
  ssl:
      # 证书名称
      key-store: yikatong.keystore
      #密钥库密码
      key-store-password: P@ssw0rd
      key-store-type: JKS
      key-alias: yikatong

此刻启动项目，输入 https://localhost/即可

平时输入http://www.baidu.com会自动跳转到https 实现如下：

package com.meatball.component;

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.context.embedded.EmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Https转换
 */
@Configuration
public class HttpsComponent {

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

    @Bean
    public Connector httpConnector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        //Connector监听的http的端口号
        connector.setPort(80);
        connector.setSecure(false);
        //监听到http的端口号后转向到的https的端口号
        connector.setRedirectPort(443);
        return connector;
    }
}

此时运行http://localhost，会自动跳转到https://localhost