Java 两次MD5

导入：

import org.apache.commons.codec.digest.DigestUtils;

　　代码：

1public static String md5(String src) {
2		return DigestUtils.md5Hex(src);
3	}
4	
5	private static final String salt = "1a2b3c4d";
6	
7	public static String inputPassToFormPass(String inputPass) {
8		String str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
9		System.out.println(str);
10		return md5(str);
11	}
12	
13	public static String formPassToDBPass(String formPass, String salt) {
14		String str = ""+salt.charAt(0)+salt.charAt(2) + formPass +salt.charAt(5) + salt.charAt(4);
15		return md5(str);
16	}
17	
18	public static String inputPassToDbPass(String inputPass, String saltDB) {
19		String formPass = inputPassToFormPass(inputPass);
20		String dbPass = formPassToDBPass(formPass, saltDB);
21		return dbPass;
22	}

　　md5：帮助类

1import java.io.File;
2import java.io.FileInputStream;
3import java.nio.MappedByteBuffer;
4import java.nio.channels.FileChannel;
5import java.security.MessageDigest;
6
7/**
8 * MD5加密工具类
9 */
10public class MD5Util {
11    private static final char DIGITS[] = { '0', '1', '2', '3', '4', '5', '6',
12	    '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
13
14    /**
15     * 获取文件的MD5码
16     * 
17     * @param absPath
18     *            文件路径
19     * @return 文件的MD5码
20     */
21    public final static String getFileMD5(String absPath) {
22	try {
23	    File file = new File(absPath);
24	    MessageDigest mdTemp = MessageDigest.getInstance("MD5");
25	    FileInputStream fis = new FileInputStream(file);
26	    FileChannel filechannel = fis.getChannel();
27	    MappedByteBuffer mbb = filechannel
28		    .map(FileChannel.MapMode.READ_ONLY, 0, file.length());
29	    mdTemp.update(mbb);
30	    byte[] md = mdTemp.digest();
31	    int j = md.length;
32	    char str[] = new char[j * 2];
33	    int k = 0;
34	    for (int i = 0; i < j; i++) {
35		byte byte0 = md[i];
36		str[k++] = DIGITS[byte0 >>> 4 & 0xf];
37		str[k++] = DIGITS[byte0 & 0xf];
38	    }
39	    fis.close();
40	    return new String(str);
41	} catch (Exception e) {
42	    return "";
43	}
44    }
45
46    /**
47     * 获取指定字符串的MD5码
48     * 
49     * @param s
50     *            字符串
51     * @return 字符串的MD5码
52     */
53    public final static String getMD5(String s) {
54	char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
55		'a', 'b', 'c', 'd', 'e', 'f' };
56	try {
57	    byte[] strTemp = s.getBytes();
58	    MessageDigest mdTemp = MessageDigest.getInstance("MD5");
59	    mdTemp.update(strTemp);
60	    byte[] md = mdTemp.digest();
61	    int j = md.length;
62	    char str[] = new char[j * 2];
63	    int k = 0;
64	    for (int i = 0; i < j; i++) {
65		byte byte0 = md[i];
66		str[k++] = hexDigits[byte0 >>> 4 & 0xf];
67		str[k++] = hexDigits[byte0 & 0xf];
68	    }
69	    return new String(str);
70	} catch (Exception e) {
71	    return null;
72	}
73    }
74    
75    public static void main(String[] args) {
76	System.out.println(getMD5("admin"));
77    }
78}