Spring Cloud 消息总线（BUS）实现自动刷新

附：natapp内网穿透详细文档

附：github代码(更新中)

ps:springboot 版本：2.1.7.RELEASE，springcloud版本：Greenwich.SR2

一.config-server：

1.引入相应jar包：

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

2.修改配置文件：application.yml

server:
  port: 8765

spring:
  application:
    name: config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/LuciferZK/config-repo
          username: [email protected]
          password: ---------*******
          #basedir: D:\project\morning-star\config-server\config\basedir
  rabbitmq:
    host: 192.168.47.131
    port: 5672
    username: guest
    password: guest

management:
  endpoints:
    web:
      exposure:
        include: bus-refresh

3.主配置类添加@EnableConfigServer注解，开启config

@EnableConfigServer
@SpringBootApplication
public class MorningConfigApplication {

    public static void main(String[] args) {
        SpringApplication.run(MorningConfigApplication.class, args);
    }

}

二：config-client

1.引入相应jar包

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

2：控制层添加RefreshScope注解；否则无法刷新看到效果

3.配置文件：bootstrap.yml

spring:
  application:
    name: morning-service-order
  cloud:
    config:
      uri: http://localhost:8765
      profile: dev
    bus:
      enabled: true
      trace:
        enabled: true
  rabbitmq:
    host: 192.168.47.131
    port: 5672
    username: guest
    password: guest

三、使用postman测试：http://localhost:8765/actuator/bus-refresh

并无任何问题。如果想自动刷新的话，不可能每次去使用postman请求一次，所以按照如下操作即可：

四：github上操作：

（1）设置

（2）添加

ps:Payload URL这个地址需要是外网能够访问的地址，而不是只是本地的http://localhost:8765/actuator/bus-refresh，没有域名，因此我这里就用到内网穿透工具。

我这里只是用的免费版的，免费的缺点是映射的外网网址不会固定不变，随机的；

具体操作看附的连接中的文档；工具双击打开：

这里的forwarding 的地址就是填在github上Payload URL的地址；再次提醒，免费版的，映射地址会变动的，除非你cmd不关闭。

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上述操作完毕后，用postman测试，并无问题，但是你在github上修改配置文件，github自动请求你的http://****/actuator/bus-refresh的时候，你的config-server会报错，报错内容就是json解析失败.

五：增加filter过滤器，并重写getInputStream方法

package com.lucifer.config.filter;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * @author: lucifer
 * @date: 2019/8/27
 * @description:
 */
@Component
//@WebFilter(urlPatterns = "/**", filterName = "BusFilter")
public class BusFilter implements Filter {

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) req;
        String requestURI = httpServletRequest.getRequestURI();
        //过滤掉非/actuator/bus-refresh请求
        if (!requestURI.endsWith("/actuator/bus-refresh")) {
            filterChain.doFilter(req, res);
            return;
        }
        RequestWrapper requestWrapper = new RequestWrapper(httpServletRequest);
        filterChain.doFilter(requestWrapper, res);
    }

    @Override
    public void destroy() {

    }

    @Override
    public void init(FilterConfig arg0) {

    }


}

package com.lucifer.config.filter;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.ByteArrayInputStream;
import java.io.IOException;

/**
 * @author: lucifer
 * @date: 2019/8/27
 * @description:
 */
public class RequestWrapper extends HttpServletRequestWrapper {

    public RequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        byte[] bytes = new byte[0];
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }

            @Override
            public boolean isFinished() {
                return byteArrayInputStream.read() == -1 ? true : false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {
            }
        };
    }
}