目录

一、pom文件

二、项目配置文件

三、日志配置文件

四、日志监听类

五、日志动态修改服务类

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        线上系统的日志级别一般都是 INFO 级别，有时候需要查看 WARN 级别的日志，所以需要动态修改日志级别。微服务项目中使用 Nacos 作为注册中心，我们可以监听 Nacos 配置，修改日志级别。

一、pom文件

		<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.18</version></dependency><!--注册中心客户端--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>2021.0.4.0</version></dependency><!--配置中心客户端--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>2021.0.4.0</version></dependency><!--Lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><scope>provided</scope></dependency>

二、项目配置文件增加如下内容

nacos:config:# 配置文件filename: nacos-provider-log-level.json# 配置GROUPgroup: DEFAULT_GROUP# 配置项keylog:level: log.level

三、日志配置文件

{"log.level":"info"
}

四、日志监听类

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.PropertyKeyConst;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;
import com.meng.backend.service.LogLevelChangeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;import javax.annotation.PostConstruct;
import java.util.Properties;
import java.util.concurrent.Executor;/*** @Author: meng* @Description: 监听Nacos* @Date: 2023/6/5 9:52* @Version: 1.0*/
@Slf4j
@Configuration
public class LoggerConfigListener {/*** 配置中心地址*/@Value("${spring.cloud.nacos.discovery.server-addr}")private String serverAddr;/*** 命名空间ID*/// @Value("${nacos.config.namespace}")// private String namespace;/*** 配置文件*/@Value("${nacos.config.filename}")private String dataId;/*** 配置GROUP*/@Value("${nacos.config.group}")private String group;/*** 配置项key*/@Value("${nacos.config.log.level}")private String logLevelName;@Autowiredprivate LogLevelChangeService logLevelChangeService;/*** 动态修改日志级别*/@PostConstructpublic void init() {try {log.info("init NacosConfigListener start...");Properties properties = new Properties();properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);// properties.put(PropertyKeyConst.NAMESPACE, namespace);ConfigService configService = NacosFactory.createConfigService(properties);String content = configService.getConfig(dataId, group, 5000);if (StrUtil.isBlank(content)) {log.info("log config is empty");return;}log.info("log config is :{}", content);configService.addListener(dataId, group, new Listener() {@Overridepublic void receiveConfigInfo(String configInfo) {try {JSONObject jsonObject = JSONObject.parseObject(configInfo);Object levelObj = jsonObject.get(logLevelName);if (levelObj != null) {logLevelChangeService.changeLogLevel(levelObj.toString());}}catch (Exception e) {log.error("receiveConfigInfo exception:", e);}}@Overridepublic Executor getExecutor() {return null;}});log.info("init NacosConfigListener end...");}catch (NacosException e) {log.error("NacosConfigListener exception:{}", e.getMessage());}}}

五、日志动态修改服务类

/*** @Author: meng* @Description: 动态调整日志级别* @Date: 2023/6/5 9:56* @Version: 1.0*/
public interface LogLevelChangeService {boolean changeLogLevel(String level);}

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import com.meng.backend.service.LogLevelChangeService;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;/*** @Author: meng* @Description: 动态调整日志级别* @Date: 2023/6/5 9:56* @Version: 1.0*/
@Slf4j
@Service
public class LogLevelChangeServiceImpl implements LogLevelChangeService {@Overridepublic boolean changeLogLevel(String level) {try {log.info("level:{}", level);LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();Logger logger = loggerContext.getLogger("ROOT");switch (level) {case "trace":logger.setLevel(Level.TRACE);break;case "debug":logger.setLevel(Level.DEBUG);break;case "info":logger.setLevel(Level.INFO);break;case "warn":logger.setLevel(Level.WARN);break;case "error":logger.setLevel(Level.ERROR);break;default:break;}return true;}catch (Exception e) {log.error("changeLogLevel exception:", e);return false;}}}