摘自：<beginging spring boot 2>

1、生成证书文件（需要进入jdk的bin目录，keytool命令才有效，具体步骤可以百度）

keytool -genkey -alias mydomain -keyalg RSA -keysize 2048 -keystore KeyStore.jks -validity 3650

2、把生成的KeyStore.jks拷贝到src/main/resource文件夹下

3、application.properties

#http -> https  
server.port=8443  
server.ssl.key-store=classpath:KeyStore.jks  
server.ssl.key-password=mydomain  
server.ssl.key-store-type=JKS  
server.ssl.key-alias=mydomain 

4、配置tomcat

package com.example.demo.config;

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.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.Validator;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * @author Siva
 *
 */
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter
{   
    @Value("${server.port:8443}") 
    private int serverPort;
    
    @Autowired
    private MessageSource messageSource;

    @Override
    public Validator getValidator() {
        LocalValidatorFactoryBean factory = new LocalValidatorFactoryBean();
        factory.setValidationMessageSource(messageSource);
        return factory;
    }
    
    @Bean
    public EmbeddedServletContainerFactory servletContainer() {
        TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory() {
            @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(initiateHttpConnector());
        return tomcat;
    }

    private Connector initiateHttpConnector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setScheme("http");
        connector.setPort(80);
        connector.setSecure(false);
        connector.setRedirectPort(serverPort);

        return connector;
    }
}

5、启动访问

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