SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”
阿新 • • 發佈：2018-12-25
在使用logback 的時候 使用的例項
java程式碼：
package com.eastcom.my.study.first.logback; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class LogbackDemo { private static Logger logger = LoggerFactory.getLogger(com.eastcom.my.study.first.logback.LogbackDemo.class); public static void main(String[] args) { logger.trace("======trace"); logger.debug("======debug"); logger.info("======info"); logger.warn("======warn"); logger.error("======error"); String name = "Aub"; String message = "3Q"; String[] fruits = { "apple", "banana" }; // logback提供的可以使用變數的列印方式，結果為"Hello,Aub!" logger.info("Hello,{}!", name); // 可以有多個引數,結果為“Hello,Aub! 3Q!” logger.info("Hello,{}! {}!", name, message); // 可以傳入一個數組，結果為"Fruit: apple,banana" logger.info("Fruit: {},{}", fruits); System.out.println("hello world "); } }
引入的jar包
<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>1.2.3</version> </dependency> <!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-core --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> <version>1.2.3</version> </dependency> <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.25</version> </dependency>
總是不能正常輸出日誌：
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
hello world 報錯
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
添加了依賴包
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
</dependency>需要去掉 <scope>test</scope>
正常情況下輸出：
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="warn">
<appender-ref ref="STDOUT" />
</root>
</configuration>over
如果加入logback.xml 檔案
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="warn">
<appender-ref ref="STDOUT" />
</root>
</configuration>其配置檔案的路徑在src/logback.xml
在程式碼中需要從新載入配置檔案
java程式碼
package com.eastcom.my.study.first.logback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.util.StatusPrinter;
public class LogbackDemo {
private static Logger logger = LoggerFactory.getLogger(com.eastcom.my.study.first.logback.LogbackDemo.class);
public static void main(String[] args) {
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.reset();
try {
configurator.doConfigure("D:/newworkspace/my-study-first/src/logback.xml");
} catch (JoranException e) {
e.printStackTrace();
}
StatusPrinter.printInCaseOfErrorsOrWarnings(lc);
System.out.println("===================");
logger.debug("Hello {}", "debug message");
logger.trace("======trace");
logger.debug("======debug");
logger.info("======info");
logger.warn("======warn");
logger.error("======error");
String name = "Aub";
String message = "3Q";
String[] fruits = { "apple", "banana" };
// logback提供的可以使用變數的列印方式，結果為"Hello,Aub!"
logger.info("Hello,{}!", name);
// 可以有多個引數,結果為“Hello,Aub! 3Q!”
logger.info("Hello,{}! {}!", name, message);
// 可以傳入一個數組，結果為"Fruit: apple,banana"
logger.info("Fruit: {},{}", fruits);
System.out.println("hello world ");
}
}
可以看到只獲得warn的日誌輸出
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/softinstall/java/apache-maven-3/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/softinstall/java/apache-maven-3/repository/org/slf4j/slf4j-simple/1.7.25/slf4j-simple-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
===================
13:34:46.762 [main] WARN c.e.m.s.first.logback.LogbackDemo - ======warn
13:34:46.773 [main] ERROR c.e.m.s.first.logback.LogbackDemo - ======error
hello world
over
在Linux下打包執行 指定配置檔案的位置，可也使用 -Dlogback.configurationFile=/data/myzjodc-test/conf/logback/logback.xml
java -Dlogback.configurationFile=/data/myzjodc-test/conf/logback/logback.xml -cp .:./my-study-first-0.0.1-SNAPSHOT-jar-with-dependencies.jar com.eastcom.my.study.first.logback.LogbackDemo2