android--detect if the TXT file contains double-byte characters

When reading double-byte characters, it mainly involves the selection of encodings:

Java code

2. Public Static Boolean isrightfultxt (File f) {
4. //TODO auto-generated method stub
6. String regexp="[^\\x00-\\xff]"; Double-byte characters
8. Pattern P=pattern.compile (regexp);
12. try {
14. FileInputStream fis=New FileInputStream (f);
16. //"GBK" encoding supports double-byte characters
18. InputStreamReader isr=New InputStreamReader (FIS, "GBK");
20. BufferedReader br=New BufferedReader (ISR);
22. String line="";
24. While ((Line=br.readline ()) =null) {
26. //Read file by line,
28. //Retrieves whether the file contains double-byte characters
30. Matcher M=p.matcher (line);
32. if (M.find ()) {
34. Fis.close ();
36. Isr.close ();
38. Br.close ();
40. return false;
42. }
44. }
46. Fis.close ();
48. Isr.close ();
50. Br.close ();
52. } catch (FileNotFoundException e) {
54. //TODO auto-generated catch block
58. E.printstacktrace ();
60. } catch (Unsupportedencodingexception e) {
62. //TODO auto-generated catch block
64. E.printstacktrace ();
66. } catch (IOException e) {
68. //TODO auto-generated catch block
70. E.printstacktrace ();
72. }
76. return true;
78. }

The above code function: detect whether the TXT file contains double-byte characters, if there is a return false, otherwise return true.

android--detect if the TXT file contains double-byte characters