一个简单的log4j2的redis appender ，依赖于Jedis (A simple log4j2 redis appender which uses Jedis)

本文介绍如何使用Log4j2配置Redis作为日志记录的目标之一，并提供了详细的配置文件示例及自定义Redis连接类实现。

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        <?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info" name="sd" packages="org.greycode.sd.base.log">
<Properties>
<Property name="logPattern">[%d{yyyy-MM-dd HH:mm:ss}] [%p] [%c] %m%n</Property>
</Properties>
<Appenders>
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout pattern="${logPattern}" />
</Console>
 
<NoSql name="redis">
<!-- <Redis host="localhost" port="" timeout="" password="" database="" clientName=""/> -->
<Redis host="localhost" />
</NoSql>
 
</Appenders>
<Loggers>
<asyncRoot level="info" includeLocation="true">
<AppenderRef ref="STDOUT" />
<AppenderRef ref="redis" />
</asyncRoot>
</Loggers>
</Configuration>
 
       

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         pom.xml

 
        <!-- LOG begin -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jcl</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-nosql</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!-- LOG end -->
 
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${disruptor.version}</version>
</dependency>
 
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>${jedis.version}</version>
</dependency>
 
       

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         RedisConnection.java

 
         package org.greycode.sd.base.log;
  
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicBoolean;
  
 import org.apache.logging.log4j.core.appender.AppenderLoggingException;
 import org.apache.logging.log4j.nosql.appender.DefaultNoSqlObject;
 import org.apache.logging.log4j.nosql.appender.NoSqlConnection;
 import org.apache.logging.log4j.nosql.appender.NoSqlObject;
  
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisPool;
  
 import com.fasterxml.jackson.databind.ObjectMapper;
  
 public class RedisConnection implements NoSqlConnection<Map<String, Object>, DefaultNoSqlObject> {
 private static final ObjectMapper mapper = new ObjectMapper();
  
 private final JedisPool pool;
 private final Jedis jedis;
 private final AtomicBoolean closed = new AtomicBoolean(false);
  
 public RedisConnection (JedisPool pool) {
 this.jedis = pool.getResource();
 this.pool = pool;
 }
  
 @Override
 public DefaultNoSqlObject createObject() {
 return new DefaultNoSqlObject();
 }
  
 @Override
 public DefaultNoSqlObject[] createList(int length) {
 // TODO Auto-generated method stub
 return new DefaultNoSqlObject[length];
 }
  
 @Override
 public void insertObject(NoSqlObject<Map<String, Object>> object) {
 try {
 jedis.lpush("redis-log4j2", mapper.writeValueAsString(object.unwrap()));
 } catch (Exception e) {
 throw new AppenderLoggingException("往Redis中插入数据时发生错误: " + e.getMessage(), e);
 }
 }
  
 @Override
 public void close() {
 if (closed.compareAndSet(false, true)) {
 this.pool.close();
 }
 }
  
 @Override
 public boolean isClosed() {
 return closed.get();
 }
  
 }
 
       

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         RedisProvider.java

 
         package org.greycode.sd.base.log;
  
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.core.config.plugins.Plugin;
 import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
 import org.apache.logging.log4j.nosql.appender.NoSqlProvider;
 import org.apache.logging.log4j.status.StatusLogger;
  
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisPool;
 import redis.clients.jedis.JedisPoolConfig;
 import redis.clients.jedis.Protocol;
  
 @Plugin(name = "Redis", category = "Core", printObject = true)
 public class RedisProvider implements NoSqlProvider<RedisConnection> {
 private static final Logger LOGGER = StatusLogger.getLogger();
  
 private final JedisPool pool;
  
 private RedisProvider (JedisPool pool) {
 this.pool = pool;
 }
  
 @PluginFactory
 public static RedisProvider createNoSqlProvider (
 @PluginAttribute("host") final String host,
 @PluginAttribute("port") int port,
 @PluginAttribute("timeout") int timeout,
 @PluginAttribute("password") final String password,
 @PluginAttribute("database") int database,
 @PluginAttribute("clientName") final String clientName
 ) {
 if (host != null && host.length() > 0) {
 try {
 if (port <= 0) port = 6379;
 if (timeout <= 0) timeout = Protocol.DEFAULT_TIMEOUT;
 if (database <= 0) database = Protocol.DEFAULT_DATABASE;
  
 JedisPool pool = null;
  
 pool = new JedisPool(new JedisPoolConfig(), host, port, timeout, password, database, clientName);
  
 try (Jedis jedis = pool.getResource()) { }
  
 return new RedisProvider(pool);
 } catch (Exception e) {
 LOGGER.error("与Redis服务器建立连接时发生错误[{}:{}]：{}",e.getMessage(), host, port);
 return null;
 }
 }
 LOGGER.error("Redis 服务器地址[host]不能为空");
 return null;
 }
  
 @Override
 public RedisConnection getConnection() {
 return new RedisConnection(pool);
 }
  
 }
 
       