Question

我是log4j的新手。我的要求是在每次迭代期间创建一个新的日志文件。基本上在每次迭代中，下面是我需要达到的目标：

使用当前时间戳作为文件夹名称
创建名为log.txt
在log.txt

我已经模拟了我需要的实现。

log4j.properties

package app.testscript;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.log4j.FileAppender;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;

public class Log4jTest {
    static{
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_hh_mm_ss_S");
        System.setProperty("log4j.test.start.timestamp", dateFormat.format(new Date()));
    }
    Logger traceLogger = Logger.getLogger("traceLogger");
    Logger rootLogger = Logger.getRootLogger();

    Logger testScriptLogger = null;

    public void doSomething() {

        try {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_hh_mm_ss_S");
            PatternLayout patterLayout = new PatternLayout("%m%n");
            String folderNameToCreate = dateFormat.format(new Date());

            FileAppender fileAppender = new FileAppender(patterLayout, "C:/MyTestLog/" + folderNameToCreate + "/log.txt", true);
            fileAppender.setName("A" + folderNameToCreate);
            fileAppender.activateOptions();
            rootLogger.addAppender(fileAppender);           

            try {
                testScriptLogger = LogManager.getLogger("A" + folderNameToCreate);
            }catch(Exception e1) {
                System.out.println("Exception e: ");
                e1.printStackTrace();
            }
            //testScriptLogger.setAdditivity(false);
            testScriptLogger.info("Message to capture in log - " + folderNameToCreate);
        }catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Log4jTest obj = new Log4jTest();
        for (int i=0; i<2; i++) {
            obj.doSomething();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }

}

java代码

testScriptLogger.setAdditivity(false);

上述代码的结果：

我可以看到创建了2个文件夹（folder_1和folder_2）
这两个文件夹中都包含log.txt
在迭代1期间创建的log.txt文件（在folder_1内）中有2行（与迭代1和迭代2相关的日志）
log.txt文件（在folder_2内）有一行（与迭代2相关的日志）

预期结果在两个log.txt文件中都有1行（在迭代1和2期间创建）

使用log4j:WARN No appenders could be found for logger (A20170518_03_49_10_802). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.时，我收到以下警告消息，并且没有任何内容写入该文件。

let Beers = [ 
    {id: 1, size: 4},
    {id: 5, size: 1},
    {id: 10, size: 0.5},
    {id: 11, size: 1},
    {id: 12, size: 2},
    {id: 13, size: 1},
];

let TrunkSize = 2;

AllCombinations = [];
var combStrings = []
function GetCombinations(currentCombination, beers, remainingSum) 
{ 

    if (remainingSum < 0) 
        return;// Sum is too large; terminate recursion

    else {
        if (currentCombination.length > 0) 
        {
            currentCombination.sort((a,b)=>{
              return a.id > b.id
            });  
            //var uniquePermutation = true;

            var tmp = currentCombination.map((cc)=>{
                  return cc.id;
               })

            if (combStrings.indexOf(JSON.stringify(tmp)) == -1) {
                this.AllCombinations.push(currentCombination);
                var tmp = currentCombination.map((cc)=>{
                  return cc.id;
                })
                combStrings.push(JSON.stringify(tmp))
            }
        }
    }

    for (var i = 0; i < beers.length; i++) {
        var newChoices = beers.slice();       
        var newCombination = currentCombination.concat(newChoices.splice(i, 1)); 
        var newRemainingSum = remainingSum - beers[i].size;
        this.GetCombinations(newCombination, newChoices, newRemainingSum);
    }
}
GetCombinations([],Beers,TrunkSize)
console.log(AllCombinations,combStrings)

请帮我解决一下。感谢

Answer 1

找到答案。

Java代码：

package app.testscript;

import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;

public class Log4jTest {
    static{
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_hh_mm_ss_S");
        System.setProperty("log4j.test.start.timestamp", dateFormat.format(new Date()));
    }
    Logger scriptLogger = Logger.getLogger("scriptLogger");
    String prevAppenderName = "";

    public void removeBaseAppenderConfiguredInlog4jProperties() {
        scriptLogger.removeAppender("scriptLog");
    }

    public void doSomething() {

        try {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_hh_mm_ss_S");
            PatternLayout patterLayout = new PatternLayout("%m%n");
            String folderNameToCreate = dateFormat.format(new Date());

            FileAppender fileAppender = new FileAppender(patterLayout, "C:/MyTestLog/" + folderNameToCreate + "/log.txt", true);
            fileAppender.setName("A" + folderNameToCreate);
            fileAppender.activateOptions();

            if(!prevAppenderName.equalsIgnoreCase("")) {
                scriptLogger.removeAppender(prevAppenderName);
            }           

            scriptLogger.addAppender(fileAppender);         
            prevAppenderName="A" + folderNameToCreate;

            scriptLogger.setAdditivity(false);
            scriptLogger.info("Message to capture in log - " + folderNameToCreate);
        }catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Log4jTest obj = new Log4jTest();
        obj.removeBaseAppenderConfiguredInlog4jProperties();
        for (int i=0; i<2; i++) {
            obj.doSomething();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

如何以编程方式添加Appender时将可加性设置为false

1 个答案: