1，写入到文件
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var
fileObj:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
fs:FileStream =
new
FileStream();
fs.open(fileObj, FileMode.WRITE);
fs.writeUTFBytes(
"hangge.com"
);
fs.close();
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2，更新文件内容
（1）下面例子在第5个字节开始覆写内容
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var
fileObj:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
fs:FileStream =
new
FileStream();
fs.open(fileObj, FileMode.UPDATE);
fs.position =
5
;
fs.writeUTFBytes(
".yuhang"
);
fs.close();
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（2）下面例子将内容添加到文件末尾
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var
fileObj:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
fs:FileStream =
new
FileStream();
fs.open(fileObj, FileMode.APPEND);
fs.writeUTFBytes(
"www.hangge.com"
);
fs.close();
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3，读取文件内容
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var
fileObj:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
fs:FileStream =
new
FileStream();
fs.open(fileObj, FileMode.READ);
var
str:
String
= fs.readUTFBytes(fs.bytesAvailable);
fs.close();
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4，移动文件
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var
originalFile:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
newDir:File = File.applicationStorageDirectory.resolvePath(
"hangge.txt"
);
originalFile.moveTo(newDir);
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5，复制文件
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var
originalFile:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
var
newDir:File = File.applicationStorageDirectory.resolvePath(
"hangge.txt"
);
originalFile.copyTo(newDir);
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6，删除文件
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var
fileObj:File = File.documentsDirectory.resolvePath(
"hangge.txt"
);
if
(fileObj.exists){
fileObj.deleteFile();
}
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7，创建文件夹
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var
fileDir:File = File.documentsDirectory.resolvePath(
"hangge"
);
fileDir.createDirectory();
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8，移动文件夹
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var
originalDir:File = File.documentsDirectory.resolvePath(
"hangge"
);
var
newDir:File = File.applicationStorageDirectory.resolvePath(
"hangge"
);
originalDir.moveTo(newDir);
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9，复制文件夹
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var
originalDir:File = File.documentsDirectory.resolvePath(
"hangge"
);
var
newDir:File = File.applicationStorageDirectory.resolvePath(
"hangge"
);
originalDir.copyTo(newDir);
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10，删除文件夹
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var
fileDir:File = File.documentsDirectory.resolvePath(
"hangge"
);
if
(fileDir.exists){
fileDir.deleteDirectory();
}
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