ssm之用logj输出日志

小鱼儿 2022-03-10 05:18 209阅读 0赞

## ssm之用logj输出日志 ##

**1.引入log4j所依赖的jar包**

<dependency>  
              <groupId>org.apache.logging.log4j</groupId>  
              <artifactId>log4j-api</artifactId>  
              <version>2.5</version>  
          </dependency>  
          <dependency>  
              <groupId>org.apache.logging.log4j</groupId>  
              <artifactId>log4j-core</artifactId>  
              <version>2.5</version>  
          </dependency>  
          <dependency>  
              <groupId>org.apache.logging.log4j</groupId>  
              <artifactId>log4j-web</artifactId>  
              <version>2.5</version>  
          </dependency>  
            
          <dependency>  
              <groupId>org.slf4j</groupId>  
              <artifactId>slf4j-log4j12</artifactId>  
              <version>1.7.13</version>  
          </dependency>

**2.在classpath的config目录下创建lo4j.properties配置文件并做如下配置**  
这里只为模板，可以有选则的配置，[更多参考模板][Link 1]

###设置#### log4j.rootLogger=debug,stdout,D,E ###输出信息到控制台### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern= [%-5p] %d{ yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ###输出DEBUG级别以上的日志到=E://logs/error.log## log4j.appender.D=org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File=E://logs/log.log log4j.appender.D.Append=true log4j.appender.D.Threshold=DEBUG log4j.appender.D.layout=org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern=%-d{ yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ] %m%n ### 输出ERROR 级别以上的日志到=E://logs/error.log ### log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{ yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    
    #在控制台打印sql语句
    #log4j.logger.com.ibatis=DEBUG
    #log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
    #log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
    #log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
    #log4j.logger.java.sql.Connection=DEBUG
    #log4j.logger.java.sql.Statement=DEBUG

**3.在web.xml中引用**

<context-param>
            <param-name>log4jConfigLocation</param-name>
            <param-value>classpath:config/log4j.properties</param-value>
        </context-param>
        <listener>
            <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
        </listener>

**4.测试，启动项目时控制台会打印日志信息**  
也可以在controller层、service层打印日志，添加

//XXX为要打印日志的类名
    public static final Logger logger = LoggerFactory.getLogger(XXX.class);
    
    //在需要打印的方法中，用此方式输出日志
    logger.debug("要输出的日志信息");

[Link 1]: https://blog.csdn.net/sihai12345/article/details/80618401