2019獨角獸企業重金招聘Python工程師標準>>>

public static String guessCharset(InputStream inputStream,boolean isAutoClose) { String charset = "GBK"; byte[] first3Bytes = new byte[3];BufferedInputStream bis = null;try {boolean checked = false; bis = new BufferedInputStream(inputStream); bis.mark(50*1024*1024); int read = bis.read(first3Bytes, 0, 3); if (read == -1)return charset;if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) { charset = "UTF-16LE"; checked = true; } else if (first3Bytes[0] == (byte) 0xFE && first3Bytes[1] == (byte) 0xFF) { charset = "UTF-16BE"; checked = true; } else if (first3Bytes[0] == (byte) 0xEF && first3Bytes[1] == (byte) 0xBB && first3Bytes[2] == (byte) 0xBF) { charset = "UTF-8"; checked = true; } bis.reset(); if (!checked) { // int len = 0; //int loc = 0; while ((read = bis.read()) != -1) { //loc++; if (read >= 0xF0) break; if (0x80 <= read && read <= 0xBF) // 單獨出現BF以下的，也算是GBK break; if (0xC0 <= read && read <= 0xDF) { read = bis.read(); if (0x80 <= read && read <= 0xBF) // 雙字節 (0xC0 - 0xDF) // (0x80 // - 0xBF),也可能在GB編碼內 continue; else break; } else if (0xE0 <= read && read <= 0xEF) {// 也有可能出錯，但是幾率較小 read = bis.read(); if (0x80 <= read && read <= 0xBF) { read = bis.read(); if (0x80 <= read && read <= 0xBF) { charset = "UTF-8"; break; } else break; } else break; } } // System.out.println( loc + " " + Integer.toHexString( read ) // ); } } catch (Exception e) { return "UTF-8"; }finally{if(isAutoClose){try {bis.close();} catch (Exception e) {} }}return charset; }

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轉載于:https://my.oschina.net/u/2391658/blog/847081

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