elasticsearch java api 網址：https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-search.html
在使用Maven創建Elasticsearch是其pom.xml的文件中必須要加入Log4j 2的依賴
elasticsearch 5.4
<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.8.2</version></dependency><dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.8.2</version></dependency>
And also provide a Log4j 2 configuration file in your classpath. For example, you can add in yoursrc/main/resources project dir a log4j2.properties file like:
appender.console.type = Consoleappender.console.name = console appender.console.layout.type = PatternLayoutrootLogger.level = info rootLogger.appenderRef.console.ref = console
If you want to use another logger than Log4j 2, you can use SLF4J bridge to do that:
<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-to-slf4j</artifactId> <version>2.8.2</version></dependency><dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.24</version> </dependency>
This page lists implementations you can use. Pick your favorite logger and add it as a dependency. As an example, we will use the slf4j-simple logger:
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <version>1.7.21</version></dependency>