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 }