解决android读取txt乱码

一，工具类FileUtil

/**

* 获取文件内容

*

* @param filePath

* @return

*/

public static String getFileOutputString(String filePath, String charset) {

try {

File file = new File(filePath);

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset), 8192);

StringBuilder sb = new StringBuilder();

String line = null;

while ((line = bufferedReader.readLine()) != null) {

sb.append("\n").append(line);

}

bufferedReader.close();

return sb.toString();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* 获取文件编码

* @param filePath

* @return

*/

public static String getCharset(String filePath) {

BufferedInputStream bis = null;

String charset = "GBK";

byte[] first3Bytes = new byte[3];

try {

boolean checked = false;

bis = new BufferedInputStream(new FileInputStream(filePath));

bis.mark(0);

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.mark(0);

if (!checked) {

while ((read = bis.read()) != -1) {

if (read >= 0xF0)

break;

if (0x80 <= read && read <= 0xBF) // 单独出现BF以下的，也算是GBK

break;

if (0xC0 <= read && read <= 0xDF) {

read = bis.read();

if (0x80 <= read && read <= 0xBF) // 双字节 (0xC0 - 0xDF)

// (0x80 - 0xBF),也可能在GB编码内

continue;

else

break;

} else if (0xE0 <= read && read <= 0xEF) {// 也有可能出错，但是几率较小

read = bis.read();

if (0x80 <= read && read <= 0xBF) {

read = bis.read();

if (0x80 <= read && read <= 0xBF) {

charset = "UTF-8";

break;

} else

break;

} else

break;

}

}

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bis != null) {

try {

bis.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return charset;

}

二，使用方法

String charset = FileUtil.getCharset(file.getAbsolutePath());

String content = FileUtil.getFileOutputString(file.getAbsolutePath(),charset);