File Content Encoding/Decoding

File Content Encoding/Decoding

/**
* {#} Base64.java Create on Nov 5, 2008 7:19:56
*
*/
Package com. gren. remotecheck. util;

Import java. io. BufferedReader;
Import java. io. BufferedWriter;
Import java. io. File;
Import java. io. FileInputStream;
Import java. io. FileOutputStream;
Import java. io. InputStreamReader;
Import java. io. OutputStreamWriter;
Import java. security. MessageDigest;
Import java. security. NoSuchAlgorithmException;

Import org. apache. log4j. Logger;

Import sun. misc. BASE64Decoder;
Import sun. misc. BASE64Encoder;

Public class FileCode {
Public static String encodeBase64File (String path) throws Exception {
File file = new File (path );
FileInputStream inputFile = new FileInputStream (file );
Byte [] buffer = new byte [(int) file. length ()];
InputFile. read (buffer );
InputFile. close ();
Return new BASE64Encoder (). encode (buffer );
}

Public static void decoderBase64File (String base64Code, String targetPath) throws Exception {
Byte [] buffer = new BASE64Decoder (). decodeBuffer (base64Code );

// For (int I = 0; I <buffer. length; I ++ ){
// If (buffer [I] <0 ){
// Buffer [I] ++ = 256;
//}
//}

File f = new File (targetPath );

If (! F. exists ())
F. createNewFile ();

FileOutputStream out = new FileOutputStream (f );
Out. write (buffer );
Out. close ();
}

Private static String hex (byte [] arr ){
StringBuffer sb = new StringBuffer ();
For (int I = 0; I <arr. length; ++ I ){
Sb. append (Integer. toHexString (arr [I] & 0xFF) | 0x100). substring (1, 3 ));
}
Return sb. toString ();
}

Public static String md5Code (String code ){
String result = "";
Try {
MessageDigest md5 = null;

Md5 = MessageDigest. getInstance ("MD5 ");
Md5.update (code. getBytes ());
Result = hex (md5.digest ());

} Catch (NoSuchAlgorithmException e ){
E. printStackTrace ();
}
Return result;
}

Public static String readFileText (String path) throws Exception {
File file = new File (path );
FileInputStream inputFile = new FileInputStream (file );

BufferedReader bf = new BufferedReader (new InputStreamReader (inputFile, "GBK "));

StringBuffer sb = new StringBuffer ();

Char [] rData = new char [1024]; // The default read cache value is 1024.
Int len = 0;
While (true ){
Len = bf. read (rData );
If (len <= 0 ){
// Log.info ("the received data length is 0 ");
Break;
}
Sb. append (new String (rData, 0, len ));
If (len <1024 ){
Break;
}
}

Bf. close ();
InputFile. close ();
Return sb. toString ();
}

Public static void saveTextFile (String filepath, String filetext) throws Exception {

File f = new File (filepath );

If (! F. exists ())
F. createNewFile ();

FileOutputStream out = new FileOutputStream (f );

BufferedWriter bw = new BufferedWriter (new OutputStreamWriter (out, "GBK "));

Bw. write (filetext );

Bw. flush ();

Out. close ();
}
}