Java之 SHA1 与MD5加密

一、SHA1加密　

 1 /*
 2      * SHA1加密，结果为小写
 3      */
 4     public static String SHA1(String decript) {
 5         try {
 6             MessageDigest digest = java.security.MessageDigest
 7                     .getInstance("SHA-1");
 8             digest.update(decript.getBytes());
 9             byte messageDigest[] = digest.digest();
10             // Create Hex String
11             StringBuffer hexString = new StringBuffer();
12             // 字节数组转换为 十六进制 数
13             for (int i = 0; i < messageDigest.length; i++) {
14                 String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
15                 if (shaHex.length() < 2) {
16                     hexString.append(0);
17                 }
18                 hexString.append(shaHex);
19             }
20             return hexString.toString();
21 
22         } catch (NoSuchAlgorithmException e) {
23             e.printStackTrace();
24         }
25         return "";
26     }

二、MD5加密

 1 /**
 2      * MD5加密
 3      */
 4     public String md5s(String plainText) {
 5         String str = "";
 6         try {
 7             MessageDigest md = MessageDigest.getInstance("MD5");
 8             md.update(plainText.getBytes());
 9             byte b[] = md.digest();
10 
11             int i;
12 
13             StringBuffer buf = new StringBuffer("");
14             for (int offset = 0; offset < b.length; offset++) {
15                 i = b[offset];
16                 if (i < 0)
17                     i += 256;
18                 if (i < 16)
19                     buf.append("0");
20                 buf.append(Integer.toHexString(i));
21             }
22             str = buf.toString();
23             System.out.println("result: " + buf.toString());// 32位的加密
24         } catch (NoSuchAlgorithmException e) {
25             e.printStackTrace();
26         }
27         return str;
28     }