gradle boot log4j2

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1.首先去掉logback依赖, 在gradle中添加如下

configurations {
	all*.exclude module: 'spring-boot-starter-logging'
    all*.exclude module: 'logback-classic'
    all*.exclude module: 'log4j-over-slf4j'
}

2.再添加log4j2的依赖和log4j2读取yaml文件依赖

compile ('org.springframework.boot:spring-boot-starter-log4j2')	
compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: '2.9.2'

3.classpath下面添加文件log4j2.yaml, 示例内容如下(Unknown property 'Configuration'这个提示请忽略).自行更改包路径和日志写盘位置

Configuration:  
  status: warn  
  
  Properties: # 定义全局变量  
    Property: # 缺省配置（用于开发环境）。其他环境需要在VM参数中指定，如下：  
      #测试：-Dlog.level.console=warn -Dlog.level.ccl=trace  
      #生产：-Dlog.level.console=warn -Dlog.level.ccl=info        
      - name: log.level.console  
        value: trace  
      - name: log.level.ccl  
        value: trace         
      - name: log.path  
        value: C:/logs  
      - name: project.name  
        value: my-spring-boot  
    
  Appenders:  
    Console:  #输出到控制台  
      name: CONSOLE  
      target: SYSTEM_OUT  
      ThresholdFilter:  
        level: ${sys:log.level.console} # “sys:”表示：如果VM参数中没指定这个变量值，则使用本文件中定义的缺省全局变量值  
        onMatch: ACCEPT  
        onMismatch: DENY  
      PatternLayout:  
        pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %X{user} %t (%F:%L) - %m%n"  
    RollingFile: # 输出到文件，超过128MB归档  
      - name: ROLLING_FILE  
        ignoreExceptions: false  
        fileName: ${log.path}/${project.name}.log  
        filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"  
        PatternLayout:  
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"  
        Policies:  
          SizeBasedTriggeringPolicy:  
            size: "128 MB"  
        DefaultRolloverStrategy:  
          max: 1000  
  
  Loggers:  
    Root:  
      level: info  
      AppenderRef:  
        - ref: CONSOLE  
        - ref: ROLLING_FILE  
    Logger: # 为com.ccl包配置特殊的Log级别，方便调试  
      - name: com.ccl  
        additivity: false  
        level: ${sys:log.level.ccl}  
        AppenderRef:  
          - ref: CONSOLE  
          - ref: ROLLING_FILE  

4.application.yaml中配置输出级别, 如下在针对app启动的日志无效了(测试用例中仍有效):

这个时候参考log4j.yaml中的[定义全局变量]下方的name:value进行配置才会对boot启动日志有效

logging:
  level:
    root: warn 

5.测试用例

import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.ccl.Application;

@SpringBootTest(classes = Application.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class Log4j2Test {

	private final Logger logger = LoggerFactory.getLogger(this.getClass());

	@Test
	public void test() throws Exception {
		MDC.put("user", "开车不直播, 出事贴吧找老哥.");//对应配置文件pattern中%X{user}变量
		logger.trace("I am trace log.");
		logger.debug("I am debug log.");
		logger.warn("I am warn log.");
		logger.error("I am error log.");
	}
}

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