# Springboot-WebFlux实现http重定向到https

# 1 简介

Spring WebFlux是一个新兴的技术,Spring团队把宝都压在响应式Reactive上了,于是推出了全新的Web实现。本文不讨论响应式编程,而是通过实例讲解Springboot WebFlux如何把http重定向到https

spring mvc and webflux venn

作为餐前小吃,建议大家先吃以下https小菜,以帮助理解:

(1)Springboot整合https原来这么简单 (opens new window)

(2)HTTPS之密钥知识与密钥工具Keytool和Keystore-Explorer (opens new window)

(3)Springboot以Tomcat为容器实现http重定向到https的两种方式 (opens new window)

(4)Springboot以Jetty为容器实现http重定向到https (opens new window)

(5)nginx开启ssl并把http重定向到https的两种方式 (opens new window)

# 2 搭建WebFlux项目

引入WebFlux的依赖如下:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

实现Controller,与之前略有不同,返回值为Mono<T>

@RestController
public class HelloController {
    @GetMapping("/hello")
    public Mono<String> hello() {
        return Mono.just("Welcome to www.pkslow.com");
    }
}

配置文件与普通的Springboot项目没什么差别,配置了两个端口,并配置SSL相关参数:

server.port=443
http.port=80

server.ssl.enabled=true
server.ssl.key-store-type=jks
server.ssl.key-store=classpath:localhost.jks
server.ssl.key-store-password=changeit
server.ssl.key-alias=localhost

# 3 重定向实现

主要做了两件事:

(1)在有https的情况下,启动另一个http服务,主要通过NettyReactiveWebServerFactory来生成一个Web服务。

(2)把http重定向到https,这里做了路径判断,加了一个简单的过滤函数。通过提供一个新的HttpHandler来实现重定向。

package com.pkslow.ssl.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.HttpHandler;
import reactor.core.publisher.Mono;
import javax.annotation.PostConstruct;
import java.net.URI;
import java.net.URISyntaxException;

@Configuration
public class HttpToHttpsConfig {

    @Value("${server.port}")
    private int httpsPort;

    @Value("${http.port}")
    private int httpPort;


    @Autowired
    private HttpHandler httpHandler;

    @PostConstruct
    public void startRedirectServer() {
        NettyReactiveWebServerFactory factory = new NettyReactiveWebServerFactory(httpPort);
        factory.getWebServer(
                (request, response) -> {
                    URI uri = request.getURI();
                    URI httpsUri;
                    try {
                        if (isNeedRedirect(uri.getPath())) {
                            httpsUri = new URI("https",
                                    uri.getUserInfo(),
                                    uri.getHost(),
                                    httpsPort,
                                    uri.getPath(),
                                    uri.getQuery(),
                                    uri.getFragment());
                            response.setStatusCode(HttpStatus.MOVED_PERMANENTLY);
                            response.getHeaders().setLocation(httpsUri);
                            return response.setComplete();
                        } else {
                            return httpHandler.handle(request, response);
                        }

                    } catch (URISyntaxException e) {
                        return Mono.error(e);
                    }
                }
        ).start();

    }

    private boolean isNeedRedirect(String path) {
        return !path.startsWith("/actuator");
    }
}

# 4 总结

本文详细代码可在南瓜慢说公众号回复<SpringbootSSLRedirectWebFlux>获取。

上次更新: 2023/8/18 23:39:36