SpringBoot下日志框架的使用 log4j/slf4j
依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.28</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
在 resources下创建log4j.properties
# 全局日志配置，file 为需要输出到本地才需加上
log4j.rootLogger=info, stdout,file
# 显示mapper下输出的日志级别为DEBUG
# 以下代码中的 com.june.ims.mapper 需要根据自己项目的命名改变
log4j.logger.com.june.ims.mapper=DEBUG
# 显示controller下的输出级别为DEBUG
log4j.logger.com.june.ims.controller=DEBUG
# 控制台输出的内容，默认一般不改
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
# log日志文件输出到本地
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.file=c:/tmp/mylog.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%5p [%t] - %m%n
简单使用slf4j
@Controller
@Slf4j
public class MyControlelr{
@GetMapping("/demo")
public String demo(){
//使用SLF4J的格式化功能
Object entry = new SomeObject();
log.debug(“The entry is {}.”, entry);
//连续的{}才被认为是格式化占位符，所以：
log.debug(“Set {1,2} differs from {}”, “3”);//output:Set{1,2} differs from 3
log.debug(“Set {1,2} differs from {{}}”, “3”);//output:Set{1,2} differs from {3}
//用”\”转义{}占位符
log.debug(“Set \{} differs from {}”, “3”); //output:Set {} differs from 3
// 直接输出内容
log.info("hello world"); // output:hello world
}
}