[log4j] 可用案例

可用的 log4j 配置， log4j.properties

log = /Users/grs/Documents/log4j
log4j.rootLogger = DEBUG, FILEROLING, FILE, CONSOLE

log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.file=${log}/log.out
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%d{ISO8601} - %-5p - %m%n

log4j.appender.FILEROLING=org.apache.log4j.RollingFileAppender
log4j.appender.FILEROLING.file=${log}/logRR.out
log4j.appender.FILEROLING.MaxFileSize=1KB
log4j.appender.FILEROLING.MaxBackupIndex=30
log4j.appender.FILEROLING.layout=org.apache.log4j.PatternLayout
log4j.appender.FILEROLING.layout.conversionPattern=%d{ISO8601} - %-5p - %m%n

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} - %-5p - %m%n

日志生成的代码

public class App {

    static String path = "src/resources/log4j.properties";
    static Logger log = Logger.getLogger(App.class.getName());

    public static void main(String[] args) throws Exception {

        PropertyConfigurator.configure(path);

        App app = new App();

        int cnt = 0;

        while (true) {
            for (int i = 0; i < 100; i++) {
                app.printLog();
            }

            Random rd = new Random();
            int rdint = rd.nextInt(3000);

            out.println(rdint + " - " + cnt);

            Thread.sleep(rdint);

            cnt++;
            if (cnt == 10) {
                break;
            }
        }
    }

    public void printLog() {
        log.debug("ddddd");

        log.info("iiiiiii");
    }
}

日志效果如下

grs:log4j grs$
grs:log4j grs$ ll -trTh
total 1128
drwx------+ 24 grs  staff   816B Apr 29 00:35:30 2016 ..
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.30
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.29
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.28
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.27
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.26
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:11 2016 logRR.out.25
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.24
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.23
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.22
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.21
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.20
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.19
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.18
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:12 2016 logRR.out.17
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.9
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.16
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.15
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.14
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.13
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.12
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.11
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:13 2016 logRR.out.10
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.8
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.7
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.6
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.5
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.4
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.3
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.2
-rw-r--r--   1 grs  staff   1.0K Apr 29 01:37:15 2016 logRR.out.1
-rw-r--r--   1 grs  staff     0B Apr 29 01:37:15 2016 logRR.out
-rw-r--r--   1 grs  staff   440K Apr 29 01:37:15 2016 log.out
drwxr-xr-x  34 grs  staff   1.1K Apr 29 01:37:15 2016 .
grs:log4j grs$