比較适合新手。邏輯上仍然有點問題。可以用于學習java檔案操作
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下面是主要的JAVA檔案操作代碼
FileHelp.javapackage 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;
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;
public static int ISTXT = 0;
private static String TXT = ".txt";
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;
}
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;
}
}
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;
}
}
}
public static boolean reName(String name, File file) {
String pathStr = file.getParent() + File.separator + name;
return file.renameTo(new File(pathStr));
}
public static boolean copeyFile(File oldFile, String toNewPath) {
String newfilepath = toNewPath + File.separator + oldFile.getName();
File temp = new File(newfilepath);
//判斷複制到的檔案路徑是否存在相對檔案，如果存在，停止該操作
if (temp.exists()) {
return false;
}
//判斷複制的檔案類型是否是檔案夾
if (oldFile.isDirectory()) {
temp.mkdir();
for (File i : oldFile.listFiles()) {
copeyFile(i, temp.getPath());
}
} else {
//如果是檔案，則進行管道複制
try {
//從檔案流中建立管道
FileInputStream fis = new FileInputStream(oldFile);
FileChannel creatChannel = fis.getChannel();
//在檔案輸出目标建立管道
FileOutputStream fos = new FileOutputStream(newfilepath);
FileChannel getChannel = fos.getChannel();
//進行檔案複制(管道對接)
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;
}
public static boolean cutFile(File oldFile, String newFilePath) {
if (copeyFile(oldFile, newFilePath)) {
oldFile.delete();
return true;
} else {
return false;
}
}
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;
}
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;
}
}
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;
}
}
以上所述就是本文的全部内容了，希望能夠對大家學習java有所幫助。
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