java_匹配图片是否相等

import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**该类用于输出两张图片是否相等
 *
 *用法  主方法中使用
 String img1 = "C:\\Users\\admin\\Desktop\\1.png";
 String img2 = "C:\\Users\\admin\\Desktop\\2.png";
 String s1 = Image.md5(Image.getByte(img1));
 System.out.println(s1);
 String s2 = Image.md5(Image.getByte(img2));
 System.out.println(s2);
 if (s1.equals(s2)) {
 System.out.println("相等");
 }else System.out.println("不相等");
* */

public class Image {
    public static byte[] getByte(String name) {
        // 得到文件长度
        File file = new File(name);
        byte[] b = new byte[(int) file.length()];
        System.out.println(file.length());
        try {
            InputStream in = new FileInputStream(file);
            try {

                in.read(b);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        }
        return b;
    }
    public static String md5(byte[] data) {
        try {

            MessageDigest md = MessageDigest.getInstance("md5");
            return new String(md.digest(data));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }


}