Java中验证编码格式的一种方法

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)); // true18         System.out.println(isUTF8(b2)); // true19         System.out.println(isUTF8(b3)); // true20         System.out.println(isUTF8(b4)); // false21     }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 }