Spring Boot：日志系统的简单使用

使用日志非常的简单，默认情况下，Spring Boot会用Logback来记录日志，并用INFO级别输出到控制台。

添加依赖

compile("org.springframework.boot:spring-boot-starter-logging")

依赖其实也不需要添加，已经包含在spring-boot-starter

修改 application.properties

logging.file.max-size=10MB
logging.path=log

配置logging.path那么就会在log文件夹生成一系列的log文件，如果超过了10MB就会对文件进行切割，就能找回之前的log文件。

└── log
    ├── spring.log
    ├── spring.log.2018-05-25.0.gz
    ├── spring.log.2018-05-25.1.gz
    ├── spring.log.2018-05-25.2.gz
    ├── spring.log.2018-05-25.3.gz
    ├── spring.log.2018-05-25.4.gz
    ├── spring.log.2018-05-25.5.gz
    └── spring.log.2018-05-25.6.gz

测试Logger

@RunWith(SpringRunner::class)
@SpringBootTest
class LoggerTest {
    var logger = LoggerFactory.getLogger(LoggerTest::class.java)
    @Test
    fun test() {
        for (i in 0..100000){
            logger.error("i = $i")
            logger.info("i = $i")
        }
    }
}

输出的日志样式

2018-05-25 13:53:33.821 ERROR 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 0
2018-05-25 13:53:33.822  INFO 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 0
2018-05-25 13:53:33.822 ERROR 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 1
2018-05-25 13:53:33.822  INFO 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 1
2018-05-25 13:53:33.822 ERROR 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 2
2018-05-25 13:53:33.822  INFO 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 2
2018-05-25 13:53:33.822 ERROR 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 3
2018-05-25 13:53:33.822  INFO 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 3
2018-05-25 13:53:33.823 ERROR 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 4
2018-05-25 13:53:33.823  INFO 46537 --- [main] com.thejoyrun.webtest.LoggerTest         : i = 4

简单检索日志

简单的打印日志方式

cat spring.log

检索带有某个字符串的日志，就会打印带有ERROR的日志

cat spring.log | grep "ERROR"

Demo代码

https://github.com/taoweiji/GradleKotlinSpringBootMybatisSQLiteDemo