日志框架log4j的小Demo

目录结构

依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

DemoController.java

package com.demo.web;

import org.apache.log4j.Logger;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;

@RestController
public class DemoController {

    private Logger logger = Logger.getLogger(DemoController.class);

    @GetMapping("/getLog")
    public String getLog(String info) {
        logger.info(new Date() + "调用了方法");
        return new Date() + "：" + info;
    }
}

DemoApplication.java

package com.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

application.properties

server.port=8080

log4j.properties

log4j.rootCategory=DEBUG,CONSOLE,LOGFILE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=-%p-%d{yyyy/MM/dd HH:mm:ss,SSS}-%l-%L-%m%n

log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.logFile.Threshold=DEBUG
log4j.appender.logFile.ImmediateFlush=true
log4j.appender.LOGFILE.Append=true
#文件路径
log4j.appender.LOGFILE.File=/Users/canrenehan/Desktop/mylog.log
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=-%p-%d{yyyy/MM/dd HH:mm:ss,SSS}-%l-%L-%m%n

项目启动时，会自动在/Users/canrenehan/Desktop路径下创建mylog.log文件，当接口被访问时，日志会被打印在控制台同时写入/Users/canrenehan/Desktop/mylog.log文件中