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FileInputStream fis = new FileInputStream(file);
BufferedReader = new BufferedReader(new InputStreamReader(new BufferedInputStream(fis),
"utf-8"));
FileInputStream fis = new FileInputStream(file);
BufferedReader reader;
BufferedInputStream in = new BufferedInputStream(fis);
in.mark(4);
byte[] first3bytes = new byte[3];
in.read(first3bytes);
in.reset();
if (first3bytes[0] == (byte) 0xEF
&& first3bytes[1] == (byte) 0xBB
&& first3bytes[2] == (byte) 0xBF) {// utf-8
reader = new BufferedReader(new InputStreamReader(in,
"utf-8"));
} else if (first3bytes[0] == (byte) 0xFF
&& first3bytes[1] == (byte) 0xFE) {
reader = new BufferedReader(new InputStreamReader(in,
"unicode"));
} else if (first3bytes[0] == (byte) 0xFE
&& first3bytes[1] == (byte) 0xFF) {
reader = new BufferedReader(new InputStreamReader(in,
"utf-16be"));
} else if (first3bytes[0] == (byte) 0xFF
&& first3bytes[1] == (byte) 0xFF) {
reader = new BufferedReader(new InputStreamReader(in,
"utf-16le"));
} else {
reader = new BufferedReader(new InputStreamReader(in,
"GBK"));
}