java读取文件生僻字处理

public static String readTxtFile(File file,String encoding) {
String lineTxt = null;
StringBuffer content = new StringBuffer();
if (file == null) {
return “”;
}
if (file.isFile() && file.exists()) { //判断文件是否存在
try {
InputStreamReader read = new InputStreamReader(
new FileInputStream(file), “GB18030”);//考虑到编码格式
BufferedReader bufferedReader = new BufferedReader(read);
//StringBuffer content = new StringBuffer();
while ((lineTxt = bufferedReader.readLine()) != null) {
//System.out.println(lineTxt);
content.append(lineTxt).append("\n");
}
read.close();

        } catch (Exception e) {
        }
    } else {
    }
    return content.toString();
}