文件命名

ゝ一世哀愁。 2022-08-27 12:41 85阅读 0赞

package io;

import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;

/\*\*  
 \*  
 \* @author chunhuif  2008-7-3  
 \* @version 1.0.0   
 \*/  
public class MyLog4j \{  
    private static String fileName="mylog.txt";    //文件路径  
    private static String maxFileSize = "10k";    //单个文件大小的最大

值 可以为 6M 、10G 、3m等等字符格式  
    private static String maxBackupIndex ="10"; //最多备份文件数  
     
    private  int maxIndex;         
    private  long maxSize;        //文件最大值  
    private  BufferedWriter bw;  
    private  long currentSize=0; //byte  
    private  File  myFile;  
    public MyLog4j()\{  
        super();  
        init();  
    \}  
    private  void  init()\{  
        myFile = new File(fileName);  
        try \{  
            rollingFile();  
        \} catch (IOException e) \{  
            e.printStackTrace();  
        \}  
        currentSize=myFile.length();  
        maxIndex=Integer.valueOf(maxBackupIndex.trim());  
        if (maxFileSize.contains("k")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("k", "").trim())

\* 1024;  
        \} else if (maxFileSize.contains("K")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("K", "").trim())

\* 1024;  
        \} else if (maxFileSize.contains("m")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("m", "").trim())

\* 1024 \* 1024;  
        \} else if (maxFileSize.contains("M")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("M", "").trim())

\* 1024 \* 1024;  
        \} else if (maxFileSize.contains("G")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("G", "").trim())

\* 1024 \* 1024 \* 1024;  
        \} else if (maxFileSize.contains("g")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("g", "").trim())

\* 1024 \* 1024 \* 1024;  
        \} else if (maxFileSize.contains("T")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("T", "").trim())

\* 1024 \* 1024 \* 1024 \* 1024;  
        \} else if (maxFileSize.contains("t")) \{  
            maxSize = Long.valueOf(maxFileSize.replace("t", "").trim())

\* 1024 \* 1024 \* 1024 \* 1024;  
        \}  
    \}  
     private synchronized void rollingFile() throws IOException\{  
        File f = new File(fileName);  
        if(f.exists())\{  
            rolling(f);  
        \}  
        f.createNewFile();  
        bw = new BufferedWriter(new FileWriter(f,true));  
    \}  
    /\*\*  
     \* 重命名，内部调用例如 将mylog.txt 命名为mylog1.txt mylog1.txt 命

名为mylog2.txt  
     \* @param ff  
     \*/  
     private void rolling(File ff)\{  
        if(bw!=null)  
            try \{  
                bw.close();  
            \} catch (IOException e) \{  
                e.printStackTrace();  
            \}  
        String fn = ff.getName();  
        String preFileName=null;  
        String tailFileName=null;  
        int fileNum = 1;  
        if(fileName.contains("."))\{  
            int index = fileName.lastIndexOf(".");  
            preFileName=fileName.substring(0,index);  
            String str=fn.substring(preFileName.length(),fn.indexOf

("."));  
            if(str!=null&&!str.equals(""))\{  
                fileNum = Integer.valueOf(str)+1;  
            \}  
            tailFileName=fileName.substring(index);  
        \}else \{  
            preFileName=fileName;  
            fileNum = Integer.valueOf(fn.substring(preFileName.length

()));  
            tailFileName="";  
        \}  
        if(fileNum<=maxIndex)\{  
            File nextFile=new File(preFileName+fileNum+tailFileName);  
            if(nextFile.exists())\{  
                rolling(nextFile);  
            \}  
            ff.renameTo(nextFile);  
        \}else\{  
            ff.delete();  
        \}  
    \}  
    /\*\*  
     \* 将信息写入log中  
     \* @param message  
     \*/  
    public synchronized void write(String message)\{  
        if(currentSize+message.getBytes().length>maxSize)\{  
            try \{  
                 rollingFile();  
                 currentSize=0;  
            \} catch (IOException e) \{  
                e.printStackTrace();  
            \}  
        \}  
        try \{  
            bw.write(message);  
            bw.flush();  
            currentSize+=message.getBytes().length;  
        \} catch (IOException e) \{  
            e.printStackTrace();  
        \}  
    \}  
    /\*\*  
     \* 将信息写入log中  
     \* @param message  
     \*/  
    public synchronized void writeLine(String message)\{  
        write(message+"/n");  
    \}  
    /\*\*  
     \* 将文件 file 中的内容写入log中  
     \* @param  
     \*/  
    public synchronized void write(File file)\{  
        if(!file.exists())\{  
            System.out.println("/""+file.getName()+"/" not exist!");  
        \}  
        BufferedReader br=null;  
        try \{  
             br= new BufferedReader(new FileReader(file));  
            String message=null;  
            while((message=br.readLine())!=null)  
            write(message+"/n");  
        \} catch (IOException e1) \{  
            e1.printStackTrace();  
        \}finally\{  
            if(br!=null)\{  
                try \{  
                    br.close();  
                \} catch (IOException e) \{  
                    e.printStackTrace();  
                \}  
            \}  
        \}  
    \}  
    public static void main(String\[\] args) \{  
        final MyLog4j  log = new MyLog4j();  
         
        for(int l=0;l<50;l++)\{  
            Thread t = new Thread()\{  
                public void run()\{  
                    for(int i=0;i<10;i++)\{  
                        log.write(Thread.currentThread().getName()+"

"+i+"/n");  
                    \}  
                \}  
            \};  
            t.setName("Thread\_"+l);  
            t.start();  
        \}  
         
        for(int i=0;i<10;i++)\{  
            MyLog4j log1 = new MyLog4j();  
            log1.write(Thread.currentThread().getName()+" = "+i+"/n");  
        \}  
    \}