背景

自己的測試類，平時都是用System.out.println();列印輸出資訊。一直不會在單個類中，使用log4j列印日誌資訊，故，做此嘗試。

做法

我這裡引用lombook的jar包，因為lombook中有@Slf4j註解

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
            <scope>provided</scope>
        </dependency>
 

測試程式碼寫法

import lombok.extern.slf4j.Slf4j;
import org.apache.log4j.BasicConfigurator;

/**
 * @author Wayss.
 * @date 2018/8/7.
 */
@Slf4j
public class TestMain {
    public static void main(String[] args) {

        BasicConfigurator.configure();

        try {
            tests("some string");
        } catch (Exception e) {
            log.error("tests方法拋異常了", e);
        }

    }

    public static boolean tests(Object object) throws Exception {

        Exception exception = new Exception("自定義異常內容");

        System.out.println(exception);
        System.out.println(exception.getMessage());
        System.out.println(exception.toString());

        throw exception;

    }

}

 

log4j.properties配置檔案資訊。

# Set root logger level to DEBUG and its only appender to A1.
log4j.rootLogger=DEBUG, A1

# A1 is set to be a ConsoleAppender.
log4j.appender.A1=org.apache.log4j.ConsoleAppender

# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%r %d{yyyy-MM-dd HH\:mm\:ss} %c %p -%m%n
 

問題: