Android 文件操作大全

1. android的文件操作要有权限：
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   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
3. SD卡下的文件操作：
4. 1、判断SD卡是否插入
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   Environment.getExternalStorageState().equals(
   android.os.Environment.MEDIA_MOUNTED);
   Environment.getExternalStorageState().equals(
   android.os.Environment.MEDIA_MOUNTED);
6. 2、获得sd卡根目录：
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   File skRoot = Environment.getExternalStorageDirectory();
   File skRoot = Environment.getExternalStorageDirectory();
8. 私有目录下的文件操作：
9. 1、获得私有根目录：
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    File fileRoot = Context.getFilesDir()+"\";
    File fileRoot = Context.getFilesDir()+"\";
11. 还未整理
12. 文件夹或文件夹操作：
13. 1、确定或获得文件夹和文件路径
14. a、获得文件或文件夹的绝对路径和相对路径。区别
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    String path = File.getPath();//相对
    String path = File.getAbsoultePath();//绝对
    String path = File.getPath();//相对
    String path = File.getAbsoultePath();//绝对
16. b 、获得文件或文件夹的父目录
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    String parentPath = File.getParent();
    String parentPath = File.getParent();
18. c、获得文件或文件夹的名称：
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    String Name = File.getName();
    String Name = File.getName();
20. 2、建立文件或文件夹
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    File.mkDir(); //建立文件夹
    File.createNewFile();//建立文件
    File.mkDir(); //建立文件夹
    File.createNewFile();//建立文件
    
22. 3、判断是文件或文件夹
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    File.isDirectory()
    File.isDirectory()
24. 4、列出文件夹下的所有文件和文件夹名
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    File[] files = File.listFiles();
    File[] files = File.listFiles();
26. 5、修改文件夹和文件名
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    File.renameTo(dest);
    File.renameTo(dest);
28. 6、删除文件夹或文件
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    File.delete();
    File.delete();
30. view plaincopy to clipboardprint?
    package otheri.common;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    
    import otheri.io.Input;
    import otheri.io.Output;
    import android.content.Context;
    import android.os.Environment;
    
    public class FileHelper {
    private Context context;
    private String SDPATH;
    private String FILESPATH;
    
    public FileHelper(Context context) {
    this.context = context;
    SDPATH = Environment.getExternalStorageDirectory().getPath() + "\";
    FILESPATH = this.context.getFilesDir().getPath() + "\";
    }
    
    
    public File creatSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    file.createNewFile();
    return file;
    }
    
    
    public boolean delSDFile(String fileName) {
    File file = new File(SDPATH + fileName);
    if (file == null || !file.exists() || file.isDirectory())
    return false;
    file.delete();
    return true;
    }
    
    
    public File creatSDDir(String dirName) {
    File dir = new File(SDPATH + dirName);
    dir.mkdir();
    return dir;
    }
    
    
    public boolean delSDDir(String dirName) {
    File dir = new File(SDPATH + dirName);
    return delDir(dir);
    }
    
    
    public boolean renameSDFile(String oldfileName, String newFileName) {
    File oleFile = new File(SDPATH + oldfileName);
    File newFile = new File(SDPATH + newFileName);
    return oleFile.renameTo(newFile);
    }
    
    
    public boolean copySDFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(SDPATH + srcFileName);
    File destFile = new File(SDPATH + destFileName);
    return copyFileTo(srcFile, destFile);
    }
    
    
    public boolean copySDFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(SDPATH + srcDirName);
    File destDir = new File(SDPATH + destDirName);
    return copyFilesTo(srcDir, destDir);
    }
    
    
    public boolean moveSDFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(SDPATH + srcFileName);
    File destFile = new File(SDPATH + destFileName);
    return moveFileTo(srcFile, destFile);
    }
    
    
    public boolean moveSDFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(SDPATH + srcDirName);
    File destDir = new File(SDPATH + destDirName);
    return moveFilesTo(srcDir, destDir);
    }
    
    
    
    public Output writeSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileOutputStream fos = new FileOutputStream(file);
    return new Output(fos);
    }
    
    
    public Output appendSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileOutputStream fos = new FileOutputStream(file, true);
    return new Output(fos);
    }
    
    
    public Input readSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileInputStream fis = new FileInputStream(file);
    return new Input(fis);
    }
    
    
    
    public File creatDataFile(String fileName) throws IOException {
    File file = new File(FILESPATH + fileName);
    file.createNewFile();
    return file;
    }
    
    
    public File creatDataDir(String dirName) {
    File dir = new File(FILESPATH + dirName);
    dir.mkdir();
    return dir;
    }
    
    
    public boolean delDataFile(String fileName) {
    File file = new File(FILESPATH + fileName);
    return delFile(file);
    }
    
    
    public boolean delDataDir(String dirName) {
    File file = new File(FILESPATH + dirName);
    return delDir(file);
    }
    
    
    public boolean renameDataFile(String oldName, String newName) {
    File oldFile = new File(FILESPATH + oldName);
    File newFile = new File(FILESPATH + newName);
    return oldFile.renameTo(newFile);
    }
    
    
    public boolean copyDataFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(FILESPATH + srcFileName);
    File destFile = new File(FILESPATH + destFileName);
    return copyFileTo(srcFile, destFile);
    }
    
    
    public boolean copyDataFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(FILESPATH + srcDirName);
    File destDir = new File(FILESPATH + destDirName);
    return copyFilesTo(srcDir, destDir);
    }
    
    
    public boolean moveDataFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(FILESPATH + srcFileName);
    File destFile = new File(FILESPATH + destFileName);
    return moveFileTo(srcFile, destFile);
    }
    
    
    public boolean moveDataFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(FILESPATH + srcDirName);
    File destDir = new File(FILESPATH + destDirName);
    return moveFilesTo(srcDir, destDir);
    }
    
    
    public Output wirteFile(String fileName) throws IOException {
    OutputStream os = context.openFileOutput(fileName,
    Context.MODE_WORLD_WRITEABLE);
    return new Output(os);
    }
    
    
    public Output appendFile(String fileName) throws IOException {
    OutputStream os = context.openFileOutput(fileName, Context.MODE_APPEND);
    return new Output(os);
    }
    
    
    public Input readFile(String fileName) throws IOException {
    InputStream is = context.openFileInput(fileName);
    return new Input(is);
    }
    
    
    
    
    
    */
    
    public boolean delFile(File file) {
    if (file.isDirectory())
    return false;
    return file.delete();
    }
    
    
    public boolean delDir(File dir) {
    if (dir == null || !dir.exists() || dir.isFile()) {
    return false;
    }
    for (File file : dir.listFiles()) {
    if (file.isFile()) {
    file.delete();
    } else if (file.isDirectory()) {
    delDir(file);// 递归
    }
    }
    dir.delete();
    return true;
    }
    
    
    public boolean copyFileTo(File srcFile, File destFile) throws IOException {
    if (srcFile.isDirectory() || destFile.isDirectory())
    return false;// 判断是否是文件
    FileInputStream fis = new FileInputStream(srcFile);
    FileOutputStream fos = new FileOutputStream(destFile);
    int readLen = 0;
    byte[] buf = new byte[1024];
    while ((readLen = fis.read(buf)) != -1) {
    fos.write(buf, 0, readLen);
    }
    fos.flush();
    fos.close();
    fis.close();
    return true;
    }
    
    
    public boolean copyFilesTo(File srcDir, File destDir) throws IOException {
    if (!srcDir.isDirectory() || !destDir.isDirectory())
    return false;// 判断是否是目录
    if (!destDir.exists())
    return false;// 判断目标目录是否存在
    File[] srcFiles = srcDir.listFiles();
    for (int i = 0; i < srcFiles.length; i++) {
    if (srcFiles[i].isFile()) {
    // 获得目标文件
    File destFile = new File(destDir.getPath() + "\"
    + srcFiles[i].getName());
    copyFileTo(srcFiles[i], destFile);
    } else if (srcFiles[i].isDirectory()) {
    File theDestDir = new File(destDir.getPath() + "\"
    + srcFiles[i].getName());
    copyFilesTo(srcFiles[i], theDestDir);
    }
    }
    return true;
    }
    
    
    public boolean moveFileTo(File srcFile, File destFile) throws IOException {
    boolean iscopy = copyFileTo(srcFile, destFile);
    if (!iscopy)
    return false;
    delFile(srcFile);
    return true;
    }
    
    
    public boolean moveFilesTo(File srcDir, File destDir) throws IOException {
    if (!srcDir.isDirectory() || !destDir.isDirectory()) {
    return false;
    }
    File[] srcDirFiles = srcDir.listFiles();
    for (int i = 0; i < srcDirFiles.length; i++) {
    if (srcDirFiles[i].isFile()) {
    File oneDestFile = new File(destDir.getPath() + "\"
    + srcDirFiles[i].getName());
    moveFileTo(srcDirFiles[i], oneDestFile);
    delFile(srcDirFiles[i]);
    } else if (srcDirFiles[i].isDirectory()) {
    File oneDestFile = new File(destDir.getPath() + "\"
    + srcDirFiles[i].getName());
    moveFilesTo(srcDirFiles[i], oneDestFile);
    delDir(srcDirFiles[i]);
    }
    
    }
    return true;
    }
    }
    package otheri.common;
31. import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
32. import otheri.io.Input;
    import otheri.io.Output;
    import android.content.Context;
    import android.os.Environment;
33. public class FileHelper {
    private Context context;
    private String SDPATH;
    private String FILESPATH;
34. public FileHelper(Context context) {
    this.context = context;
    SDPATH = Environment.getExternalStorageDirectory().getPath() + "\";
    FILESPATH = this.context.getFilesDir().getPath() + "\";
    }
35. 
    public File creatSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    file.createNewFile();
    return file;
    }
36. 
    public boolean delSDFile(String fileName) {
    File file = new File(SDPATH + fileName);
    if (file == null || !file.exists() || file.isDirectory())
    return false;
    file.delete();
    return true;
    }
37. 
    public File creatSDDir(String dirName) {
    File dir = new File(SDPATH + dirName);
    dir.mkdir();
    return dir;
    }
38. 
    public boolean delSDDir(String dirName) {
    File dir = new File(SDPATH + dirName);
    return delDir(dir);
    }
39. 
    public boolean renameSDFile(String oldfileName, String newFileName) {
    File oleFile = new File(SDPATH + oldfileName);
    File newFile = new File(SDPATH + newFileName);
    return oleFile.renameTo(newFile);
    }
40. 
    public boolean copySDFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(SDPATH + srcFileName);
    File destFile = new File(SDPATH + destFileName);
    return copyFileTo(srcFile, destFile);
    }
41. 
    public boolean copySDFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(SDPATH + srcDirName);
    File destDir = new File(SDPATH + destDirName);
    return copyFilesTo(srcDir, destDir);
    }
42. 
    public boolean moveSDFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(SDPATH + srcFileName);
    File destFile = new File(SDPATH + destFileName);
    return moveFileTo(srcFile, destFile);
    }
43. 
    public boolean moveSDFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(SDPATH + srcDirName);
    File destDir = new File(SDPATH + destDirName);
    return moveFilesTo(srcDir, destDir);
    }
44. 
    
    public Output writeSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileOutputStream fos = new FileOutputStream(file);
    return new Output(fos);
    }
45. 
    public Output appendSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileOutputStream fos = new FileOutputStream(file, true);
    return new Output(fos);
    }
46. 
    public Input readSDFile(String fileName) throws IOException {
    File file = new File(SDPATH + fileName);
    FileInputStream fis = new FileInputStream(file);
    return new Input(fis);
    }
    
    
    
    public File creatDataFile(String fileName) throws IOException {
    File file = new File(FILESPATH + fileName);
    file.createNewFile();
    return file;
    }
47. 
    public File creatDataDir(String dirName) {
    File dir = new File(FILESPATH + dirName);
    dir.mkdir();
    return dir;
    }
48. 
    public boolean delDataFile(String fileName) {
    File file = new File(FILESPATH + fileName);
    return delFile(file);
    }
49. 
    public boolean delDataDir(String dirName) {
    File file = new File(FILESPATH + dirName);
    return delDir(file);
    }
50. 
    public boolean renameDataFile(String oldName, String newName) {
    File oldFile = new File(FILESPATH + oldName);
    File newFile = new File(FILESPATH + newName);
    return oldFile.renameTo(newFile);
    }
51. 
    public boolean copyDataFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(FILESPATH + srcFileName);
    File destFile = new File(FILESPATH + destFileName);
    return copyFileTo(srcFile, destFile);
    }
52. 
    public boolean copyDataFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(FILESPATH + srcDirName);
    File destDir = new File(FILESPATH + destDirName);
    return copyFilesTo(srcDir, destDir);
    }
53. 
    public boolean moveDataFileTo(String srcFileName, String destFileName)
    throws IOException {
    File srcFile = new File(FILESPATH + srcFileName);
    File destFile = new File(FILESPATH + destFileName);
    return moveFileTo(srcFile, destFile);
    }
54. 
    public boolean moveDataFilesTo(String srcDirName, String destDirName)
    throws IOException {
    File srcDir = new File(FILESPATH + srcDirName);
    File destDir = new File(FILESPATH + destDirName);
    return moveFilesTo(srcDir, destDir);
    }
55. 
    public Output wirteFile(String fileName) throws IOException {
    OutputStream os = context.openFileOutput(fileName,
    Context.MODE_WORLD_WRITEABLE);
    return new Output(os);
    }
56. 
    public Output appendFile(String fileName) throws IOException {
    OutputStream os = context.openFileOutput(fileName, Context.MODE_APPEND);
    return new Output(os);
    }
57. 
    public Input readFile(String fileName) throws IOException {
    InputStream is = context.openFileInput(fileName);
    return new Input(is);
    }
    
    
    
    
    
    */
    
    public boolean delFile(File file) {
    if (file.isDirectory())
    return false;
    return file.delete();
    }
58. 
    public boolean delDir(File dir) {
    if (dir == null || !dir.exists() || dir.isFile()) {
    return false;
    }
    for (File file : dir.listFiles()) {
    if (file.isFile()) {
    file.delete();
    } else if (file.isDirectory()) {
    delDir(file);// 递归
    }
    }
    dir.delete();
    return true;
    }
59. 
    public boolean copyFileTo(File srcFile, File destFile) throws IOException {
    if (srcFile.isDirectory() || destFile.isDirectory())
    return false;// 判断是否是文件
    FileInputStream fis = new FileInputStream(srcFile);
    FileOutputStream fos = new FileOutputStream(destFile);
    int readLen = 0;
    byte[] buf = new byte[1024];
    while ((readLen = fis.read(buf)) != -1) {
    fos.write(buf, 0, readLen);
    }
    fos.flush();
    fos.close();
    fis.close();
    return true;
    }
60. 
    public boolean copyFilesTo(File srcDir, File destDir) throws IOException {
    if (!srcDir.isDirectory() || !destDir.isDirectory())
    return false;// 判断是否是目录
    if (!destDir.exists())
    return false;// 判断目标目录是否存在
    File[] srcFiles = srcDir.listFiles();
    for (int i = 0; i < srcFiles.length; i++) {
    if (srcFiles[i].isFile()) {
    // 获得目标文件
    File destFile = new File(destDir.getPath() + "\"
    + srcFiles[i].getName());
    copyFileTo(srcFiles[i], destFile);
    } else if (srcFiles[i].isDirectory()) {
    File theDestDir = new File(destDir.getPath() + "\"
    + srcFiles[i].getName());
    copyFilesTo(srcFiles[i], theDestDir);
    }
    }
    return true;
    }
61. 
    public boolean moveFileTo(File srcFile, File destFile) throws IOException {
    boolean iscopy = copyFileTo(srcFile, destFile);
    if (!iscopy)
    return false;
    delFile(srcFile);
    return true;
    }
62. 
    public boolean moveFilesTo(File srcDir, File destDir) throws IOException {
    if (!srcDir.isDirectory() || !destDir.isDirectory()) {
    return false;
    }
    File[] srcDirFiles = srcDir.listFiles();
    for (int i = 0; i < srcDirFiles.length; i++) {
    if (srcDirFiles[i].isFile()) {
    File oneDestFile = new File(destDir.getPath() + "\"
    + srcDirFiles[i].getName());
    moveFileTo(srcDirFiles[i], oneDestFile);
    delFile(srcDirFiles[i]);
    } else if (srcDirFiles[i].isDirectory()) {
    File oneDestFile = new File(destDir.getPath() + "\"
    + srcDirFiles[i].getName());
    moveFilesTo(srcDirFiles[i], oneDestFile);
    delDir(srcDirFiles[i]);
    }
63. }
    return true;
    }
    }
    
64. getPath与getAbsoultePath的区别:
65. getAbsolutePath()：返回抽象路径名的绝对路径名字符串。
66. view plaincopy to clipboardprint?
    public static void test1(){
    File file1 = new File(".\\test1.txt");
    File file2 = new File("D:\\workspace\\test\\test1.txt");
    System.out.println("-----默认相对路径：取得路径不同------");
    System.out.println(file1.getPath());
    System.out.println(file1.getAbsolutePath());
    System.out.println("-----默认绝对路径:取得路径相同------");
    System.out.println(file2.getPath());
    System.out.println(file2.getAbsolutePath());
    
    }
    
    -----默认相对路径：取得路径不同------
    .\test1.txt
    D:\workspace\test\.\test1.txt
    -----默认绝对路径:取得路径相同------
    D:\workspace\test\test1.txt
    D:\workspace\test\test1.txt
    
    ----------------------------------------------------
    
    public static void test2() throws Exception{
    File file = new File("..\\src\\test1.txt");
    System.out.println(file.getAbsolutePath());
    System.out.println(file.getCanonicalPath());
    }
    D:\workspace\test\..\src\test1.txt
    D:\workspace\src\test1.txt
    
    --------------------------------------------
    public static void test3() throws Exception{
    File file = new File("D:\\Text.txt");
    System.out.println(file.getCanonicalPath());

1楼u010091835前天 08:27

好长啊，是老C？