SpringBoot配置disconf流程和遇到的坑

1.建立SpringBoot项目，具体见另一篇文档

IDEA创建SpringBoot项目并配置Mybatis

2.添加disconf依赖

    com.baidu.disconf
    disconf-client
    2.3.36

3.在resource文件下(和application.properties同级)添加disconf.xml文件，redis.properties文件和disconf.properties

disconf.xml

    
    
    
    
        
    
    
    
    
    
        
            
                classpath:/redis.properties
            
        
    

    
        
        
        
            
                
            
        
    

redis.properties

redis.host=127.0.0.1
redis.port=6379

disconf.properties

# 是否使用远程配置文件
# true(默认)会从远程获取配置 false则直接获取本地配置enable.remote.conf=true
#
# 配置服务器的 HOST,用逗号分隔 127.0.0.1:8000,127.0.0.1:8000
# conf_server_host=127.0.0.1:8080
# 版本, 请采用 X_X_X_X 格式version=1_0_0_0
# APP 请采用 产品线_服务名 格式app=disconf_demo
# 环境env=rd
# debugdebug=true
# 忽略哪些分布式配置，用逗号分隔ignore=
# 获取远程配置 重试次数，默认是3次conf_server_url_retry_times=1
# 获取远程配置 重试时休眠时间，默认是5秒conf_server_url_retry_sleep_seconds=1

4.在Main类中添加resource文件

@SpringBootApplication
@MapperScan("com.sf.j.mapper")
@ComponentScan("com.sf.j")
@ImportResource({"classpath:disconf.xml"})
public class SpringBootDisconfApplication {

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

}

5.根据官方文档来添加对应的Redis类

JedisConfig.java

@Service
@Scope("singleton")
@PropertySource("classpath:redis.properties")
@DisconfFile(filename = "redis.properties")
public class JedisConfig {

    // 代表连接地址
    @Value("${redis.host}")
    private String host;

    // 代表连接port
    @Value("${redis.port}")
    private String port;

    /**
     * 地址, 分布式文件配置
     *
     * @return
     */
    @DisconfFileItem(name = "redis.host", associateField = "host")
    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    /**
     * 端口, 分布式文件配置
     *
     * @return
     */
    @DisconfFileItem(name = "redis.port", associateField = "port")
    public String getPort() {
        return port;
    }

    public void setPort(String port) {
        this.port = port;
    }
}

SimpleDemoService.java

@Service
@Scope("singleton")
public class SimpleDemoService {

/**
     * 分布式配置
     */

    @Autowired
    private JedisConfig jedisConfig;

/**
     * 后台更改值
 */

    public void changeConfig() {
        System.out.println("host:"+jedisConfig.getHost());
        System.out.println("port"+jedisConfig.getPort());
    }
}

SimpleDemoServiceUpdateCallback.java

@Service
@DisconfUpdateService(classes = { JedisConfig.class})
public class SimpleDemoServiceUpdateCallback implements IDisconfUpdate {


    @Autowired
    private SimpleDemoService simpleDemoService;

    public void reload() throws Exception {
        simpleDemoService.changeConfig();
    }
}

6.启动项目，直接弹出异常，这是由于springboot本身的日志文件与disconf本身的日志文件依赖冲突，导致项目无法启动，我们通过在pom.xml文件中添加日志包来解决冲突。

报错信息：

Exception in thread "main" java.lang.IllegalArgumentException:
 LoggerFactory is not a Logback LoggerContext but Logback is on the
 classpath. Either remove Logback or the competing implementation
 (class org.slf4j.impl.Log4jLoggerFactory) Object of class
 [org.slf4j.impl.Log4jLoggerFactory] must be an instance of class
 ch.qos.logback.classic.LoggerContext   at
 org.springframework.util.Assert.isInstanceOf(Assert.java:339)  at
 org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:93)
        at
org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSensibleDefaults(AbstractLoggingSystem.java:62)
        At org.springframework.boot.logging.AbstractLoggingSystem.beforeInitialize(AbstractLoggingSystem.java:45)
    at
org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:69)
    at
org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:135)
    at
org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:98)
    at
org.springframework.boot.context.event.EventPublishingRunListener.publishEvent(EventPublishingRunListener.java:100)
    at
org.springframework.boot.context.event.EventPublishingRunListener.started(EventPublishingRunListener.java:54)
At
org.springframework.boot.SpringApplication.run(SpringApplication.java:276)
    at

 org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
    at
 org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
    at org.magnum.mobilecloud.video.Application.main(Application.java:30)

添加依赖：

    
        org.slf4j
        slf4j-log4j12
        1.7.25
    

7.解决后，启动项目，又出现了如下报错，这是由于disconf使用的是旧版本的API，该API在spring5.0和SpringBoot2.0以上版本时已经被删除了，我们可以通过修改源码来解决该问题。

报错信息：

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

 com.baidu.disconf.client.addons.properties.ReloadingPropertyPlaceholderConfigurer.parseStringValue(ReloadingPropertyPlac

eholderConfigurer.java:88)

The following method did not exist:

修改com.baidu.disconf.client.addons.properties.ReloadingPropertyPlaceholderConfigurer.parseStringValue的源码即可：

// Fixed an issue with using obsolete api, which can't be started in spring5.
// then, business as usual. no recursive reloading placeholders please.PropertyPlaceholderHelper helper = new PropertyPlaceholderHelper(placeholderPrefix, placeholderSuffix, valueSeparator, ignoreUnresolvablePlaceholders);
return helper.replacePlaceholders(strVal, props);

8.启动项目后，disconf连接成功，这样就初步搭建完成了，我们在web段修改redis.properties的host值，可以看到后台立刻打印出了相关信息，说明其连接成功。

2019-10-11 11:20:31.312  INFO 4032 --- [           main] com.baidu.disconf.client.DisconfMgr      : ******************************* DISCONF END *******************************
2019-10-11 11:20:31.454  INFO 4032 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-10-11 11:20:31.639  INFO 4032 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 9998 (http) with context path ''
2019-10-11 11:20:31.641  INFO 4032 --- [           main] c.s.j.s.SpringBootDisconfApplication     : Started SpringBootDisconfApplication in 11.446 seconds (JVM running for 11.879)
2019-10-11 11:32:00.668  INFO 4032 --- [ain-EventThread] c.b.d.client.watch.inner.NodeWatcher     : ============GOT UPDATE EVENT WatchedEvent state:SyncConnected type:NodeDataChanged path:/disconf/Jtest_1_0_0_0_dev/file/redis.properties: (/disconf/Jtest_1_0_0_0_dev/file/redis.properties,redis.properties,配置文件)======================
2019-10-11 11:32:00.781  INFO 4032 --- [ain-EventThread] c.b.d.c.c.p.i.DisconfCoreProcessUtils    : start to call class com.sf.j.service.SimpleDemoServiceUpdateCallback
host:127.0.0.101
port6379
2019-10-11 11:32:00.799  INFO 4032 --- [ain-EventThread] c.b.d.client.watch.inner.NodeWatcher     : ============GOT UPDATE EVENT WatchedEvent state:SyncConnected type:NodeDataChanged path:/disconf/Jtest_1_0_0_0_dev/file/redis.properties: (/disconf/Jtest_1_0_0_0_dev/file/redis.properties,redis.properties,配置文件)======================
2019-10-11 11:32:00.907  INFO 4032 --- [ain-EventThread] c.b.d.c.c.p.i.DisconfCoreProcessUtils    : start to call class com.sf.j.service.SimpleDemoServiceUpdateCallback
host:127.0.0.101
port6379