業務常用,供大家學習:

引用地址:http://www.easydone.cn/014/200604022353065155.htm

package org.easydone.file;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * <p>Title: File 常用操作(部分)</p>
 * <p>Description: 業務用</p>
 * <p>Copyright: Copyright (c) 2006 www.easydone.cn</p>
 * <p>Company: 北京聚能易成科技有限公司</p>
 * @authory dirboy
 * @version 1.0
 */

public class FileOperate {

    /**
    * 創建目錄
    * @param folderPath:目錄路徑
    * @return
    * @throws IOException
    */
    public static boolean createFolder(String folderPath) throws IOException {
        boolean result = false;
        File f = new File(folderPath);
        result = f.mkdirs();
        return result;
    }
    /**
    * 刪除目錄下所有文件
    * @param directory (File 對象)
    */
    public void emptyDirectory(File directory) {
        File[] entries = directory.listFiles();
        for (int i = 0; i < entries.length; i++) {
            entries[i].delete();
        }
    }

    /**
    * 創建文件
    * @param filepath:文件所在目錄路徑,比如:c:/test/test.txt
    * @return
    */
    public static boolean makeFile(String filepath) throws IOException {
        boolean result = false;
        File file = new File(filepath);
        result = file.createNewFile();
        file = null;
        return result;
    }
    /**
    * 刪除文件
    * @param filepath:文件所在物理路徑
    * @return
    */
    public static boolean isDel(String filepath) {
        boolean result = false;
        File file = new File(filepath);
        result = file.delete();
        file = null;
        return result;
    }
    /**
    * 文件重命名
    * @param filepath:文件所在物理路徑
    * @param destname:新文件名
    * @return
    */
    public static boolean renamefile(String filepath,String destname) {
        boolean result = false;
        File f = new File(filepath);
        String fileParent = f.getParent();
        String filename = f.getName();
        File rf = new File(fileParent+"http://"+destname);
        if(f.renameTo(rf)) {
            result = true;
        }
        f = null;
        rf = null;
        return result;
    }
    /**
    * 將文件內容寫入數據庫中
    * @param filepath:文件所在物理路徑
    * @param content:寫入內容
    * @throws Exception
    */
    public static void WriteFile(String filepath,String content) throws Exception {
        FileWriter filewriter = new FileWriter(filepath,true);//寫入多行
        PrintWriter printwriter = new PrintWriter(filewriter);
        printwriter.println(content);
        printwriter.flush();
        printwriter.close();
        filewriter.close();
    }
    /**
    * 日志備份
    * @param filePath:日志備份路徑
    * @param baksize:日志備份大小參考值(字節大小)
    * @throws IOException
    */
    public static void logBak(String filePath,long baksize) throws IOException {
        File f = new File(filePath);
        long len = f.length();
        SimpleDateFormat simpledateformat = new SimpleDateFormat("yyyyMMddHHmmss");
        String s = simpledateformat.format(new Date());
        String fileName = f.getName();
        int dot = fileName.indexOf(".");
        String bakName = s+fileName.substring(dot);
        System.out.println(bakName);
        if(len>=baksize) {
            renamefile(filePath,bakName);
            makeFile(filePath);
        }
        f = null;
    }

}