Java_MD5加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * MD5加密工具類
 *
 */
public class MD5Utils {

	    // 全局數組
	    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",
	            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	    // 返回形式爲數字跟字符串
	    private static String byteToArrayString(byte bByte) {
	        int iRet = bByte;
	        if (iRet < 0) {
	            iRet += 256;
	        }
	        int iD1 = iRet / 16;
	        int iD2 = iRet % 16;
	        return strDigits[iD1] + strDigits[iD2];
	    }

	    // 返回形式只爲數字
	    @SuppressWarnings("unused")
		private static String byteToNum(byte bByte) {
	        int iRet = bByte;
	        System.out.println("iRet1=" + iRet);
	        if (iRet < 0) {
	            iRet += 256;
	        }
	        return String.valueOf(iRet);
	    }

	    // 轉換字節數組爲16進制字串
	    private static String byteToString(byte[] bByte) {
	        StringBuffer sBuffer = new StringBuffer();
	        for (int i = 0; i < bByte.length; i++) {
	            sBuffer.append(byteToArrayString(bByte[i]));
	        }
	        return sBuffer.toString();
	    }

	    public static String getMD5Code(String strObj) {
	        String resultString = null;
	        try {
	            resultString = new String(strObj);
	            MessageDigest md = MessageDigest.getInstance("MD5");
	            // md.digest() 該函數返回值爲存放哈希值結果的byte數組
	            resultString = byteToString(md.digest(strObj.getBytes()));
	        } catch (NoSuchAlgorithmException ex) {
	            ex.printStackTrace();
	        }
	        return resultString;
	    }

	    public static void main(String[] args) {
	    	System.out.println(MD5Utils.getMD5Code("test"));
	    }
}

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