Home  >  Article  >  Java  >  File manager code sharing written in java

File manager code sharing written in java

高洛峰
高洛峰Original
2017-01-21 14:29:101847browse

More suitable for novices. There's still some logic issues. Can be used to learn java file operations

Download address: http://yun.baidu.com/share/link?shareid=4184742416&uk=1312160419

The following is the main JAVA file operation code

FileHelp.java

package self.yy.filesystem.fileutil;
  
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
  
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URI;
import java.nio.channels.FileChannel;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
  
/**
 * 文件的相关帮助类
 */
public class FileHelp {
  private static final String TAG = "FileHelp";
  
  public static final String JPG = ".jpg";
  public static final String PNG = ".png";
  
  public static final String MP3 = ".mp3";
  public static final String MP4 = ".mp4";
  public static final String APK = ".apk";
  
  //上下文
  private static Context context;
  
  /**
   * txt文本
   */
  public static int ISTXT = 0;
  
  private static String TXT = ".txt";
  
  /**
   * 文件删除
   */
  public static boolean deletfile(File file) {
    if (file.isDirectory()) {
      if (file.listFiles().length > 0) {
        for (File i : file.listFiles()) {
          deletfile(i);
        }
      } else {
        file.delete();
      }
    } else {
      file.delete();
    }
    file.delete();
    return true;
  }
  
  /**
   * 新建文件夹
   * 返回true 文件创建成功
   * 返回false 文件创建失败 ->文件存在
   * 返回true 文件创建成功,返回false 文件创建失败 (文件存在、权限不够)
   */
  public static boolean creatFile(String filename, String path) {
    File file = new File(path + File.separator + filename);
    if (file.exists()) {
      return false;
    } else {
      file.mkdir();
      return true;
    }
  }
  
  /**
   * 创建自定义文件类型文件
   * 随意为文件夹
   * 0 txt文本
   *
   * @return boolean
   * 返回true 文件创建成功,返回false 文件创建失败 (文件存在、权限不够)
   * *
   */
  public static boolean creatFile(String filename, String path, int type) {
    String ptr = path + File.separator + filename;
    File file;
    switch (type) {
      case 0:
        file = new File(ptr + TXT);
        break;
      default:
        file = new File(ptr);
        break;
    }
    if (file.exists()) {
      return false;
    } else {
      try {
        file.createNewFile();
        return true;
      } catch (IOException e) {
        return false;
      }
    }
  }
  
  
  /**
   * 文件重名
   *
   * @param name 新创建的文件名
   * @param file 创建文件的地方
   */
  public static boolean reName(String name, File file) {
    String pathStr = file.getParent() + File.separator + name;
    return file.renameTo(new File(pathStr));
  }
  
  /**
   * 文件复制
   *
   * @param oldFile  要被复制的文件
   * @param toNewPath 复制到的地方
   * @return boolean trun 复制成功,false 复制失败
   * *
   */
  public static boolean copeyFile(File oldFile, String toNewPath) {
    String newfilepath = toNewPath + File.separator + oldFile.getName();
  
    File temp = new File(newfilepath);
    //判断复制到的文件路径是否存在相对文件,如果存在,停止该操作
    if (temp.exists()) {
      return false;
    }
    //判断复制的文件类型是否是文件夹
    if (oldFile.isDirectory()) {
      temp.mkdir();
      for (File i : oldFile.listFiles()) {
        copeyFile(i, temp.getPath());
      }
    } else {
      //如果是文件,则进行管道复制
      try {
        //从文件流中创建管道
        FileInputStream fis = new FileInputStream(oldFile);
        FileChannel creatChannel = fis.getChannel();
        //在文件输出目标创建管道
        FileOutputStream fos = new FileOutputStream(newfilepath);
        FileChannel getChannel = fos.getChannel();
        //进行文件复制(管道对接)
        getChannel.transferFrom(creatChannel, 0, creatChannel.size());
  
        getChannel.close();
        creatChannel.close();
        fos.flush();
        fos.close();
        fis.close();
      } catch (Exception e) {
        Log.i(TAG, "copey defeated,mebey file was existed");
        e.printStackTrace();
        return false;
      }
    }
    return true;
  }
  
  /**
   * 文件剪切
   *
   * @param oldFile   要被剪切的文件
   * @param newFilePath 剪切到的地方
   * @return boolean trun 剪切成功,false 剪切失败
   */
  public static boolean cutFile(File oldFile, String newFilePath) {
    if (copeyFile(oldFile, newFilePath)) {
      oldFile.delete();
      return true;
    } else {
      return false;
    }
  }
  
  
  /**
   * 获取对应文件类型的问件集
   *
   * @param dir 文件夹
   * @param type 文件类型,格式".xxx"
   * @return List 文件集合
   */
  public static List getTheTypeFile(File dir, String type) {
    List files = new ArrayList();
    for (File i : dir.listFiles()) {
      String filesTyepe = getFileType(i);
      if (type.equals(filesTyepe)) {
        files.add(i);
      }
    }
    return files;
  }
  
  /**
   * 获取文件类型
   *
   * @param file 需要验证的文件
   * @return String 文件类型
   * 如:
   * 传入文件名为“test.txt”的文件
   * 返回 .txt
   * *
   */
  public static String getFileType(File file) {
    String fileName = file.getName();
    if (fileName.contains(".")) {
  
      String fileType = fileName.substring(fileName.lastIndexOf("."),
          fileName.length());
      return fileType;
    } else {
      return null;
    }
  }
  
  
  /**
   * 获取文件最后操作时间类
   *
   * @param file 需要查询的文件类
   * @return “yy/MM/dd HH:mm:ss”的数据字符串
   * 如:
   * 14/07/01 01:02:03
   */
  public static String getCreatTime(File file) {
    long time = file.lastModified();
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat dateFormat = new SimpleDateFormat("yy/MM/dd HH:mm:ss");
    String date = dateFormat.format(calendar.getTime());
    return date;
  }
  
}

The above is the entire content of this article. I hope it will be helpful to everyone learning java.

For more articles related to file manager code sharing written in java, please pay attention to the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn