1 package forlittlecatty;
2
3 import java.io.File;
4 import java.io.FileInputStream;
5 import java.io.IOException;
6 import java.io.InputStream;
7 import java.io.UnsupportedEncodingException;
8 import java.util.Arrays;
9
10 public class MainTest {
11
12 public static void main(String[] args) {
13 byte[] b1 = readByte(new File("./src/main/java/forlittlecatty/iso8859-1_en")); // 文件编码: ISO-8859-1 文件内容: "abc123!@#$%^&*()"
14 byte[] b2 = readByte(new File("./src/main/java/forlittlecatty/utf-8_en_cn")); // 文件编码: UTF-8 文件内容: "abc123!@#$%^&*()小猫咪"
15 byte[] b3 = readByte(new File("./src/main/java/forlittlecatty/gbk_en")); // 文件编码: GBK 文件内容: "abc123!@#$%^&*()"
16 byte[] b4 = readByte(new File("./src/main/java/forlittlecatty/gbk_cn")); // 文件编码: GBK 文件内容: "小猫咪"
17 System.out.println(isUTF8(b1)); // true
18 System.out.println(isUTF8(b2)); // true
19 System.out.println(isUTF8(b3)); // true
20 System.out.println(isUTF8(b4)); // false
21 }
22
23 private static byte[] readByte(File file) {
24 InputStream input = null;
25 byte[] bytes = null;
26 try {
27 input = new FileInputStream(file);
28 bytes = new byte[256];
29 input.read(bytes);
30 } catch (IOException e) {
31 e.printStackTrace();
32 } finally {
33 try {
34 input.close();
35 } catch (IOException e) {
36 e.printStackTrace();
37 }
38 }
39 return bytes;
40 }
41
42 private static boolean isUTF8(byte[] src) {
43 byte[] tmp = null;
44 try {
45 tmp = new String(src, "UTF-8").getBytes("UTF-8");
46 } catch (UnsupportedEncodingException e) {
47 e.printStackTrace();
48 }
49 return Arrays.equals(src, tmp);
50 }
51 }
