Spring Cloud 消息总线（BUS）实现自动刷新

阳光穿透心脏的1/2处 2024-04-17 14:53 81阅读 0赞

### 附：[natapp内网穿透 详细文档][natapp_] ###

### 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: 13871xxxxx@163.com
              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 ###

![20190827164454316.png][]

### 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][http_localhost_8765_actuator_bus-refresh] ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70][]

**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**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 1][]

（2）添加

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 2][]

### **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][http_localhost_8765_actuator_bus-refresh]，没有域名，因此我这里就用到[内网穿透工具][natapp_]。** ###

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：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 3][]

**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。**

**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][http_localhost_8765_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) {
                }
            };
        }
    }

[natapp_]: https://natapp.cn/article/natapp_newbie
[20190827164454316.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/85d21612e3534a0f842c9ae7a16f2b44.png
[http_localhost_8765_actuator_bus-refresh]: http://localhost:8765/actuator/bus-refresh
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/03023f15e05e48c282c5666bd53d8afa.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/1db9783897b24be4b9e1fbf7c171136a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/dcfbafe8689b4cb49ee12b5f9b083279.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/e69f10a52a45486c8cb46620ac1aad93.png