DM5 java 例子

package com.cmb.fbcbcserver;

import java.security.MessageDigest;

/**
 * <p>
 * Title: 
 * </p>
 * 
 * <p>
 * Description: 
 * </p>
 * 
 * <p>
 * Copyright: 融博技术有限公司 2012
 * </p>
 * 
 * @author 袁泉锋HO174959
 * @version 1.0
 * @date Aug 2, 2012
 *
 */
public class MD5 {
	private String inStr;
	private MessageDigest md5;
	public MD5(String inStr) {
		this.inStr = inStr;
		try {
			this.md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	/**
	 * Computes the MD5 fingerprint of a string.
	 * @return the MD5 digest of the input <code>String</code>
	 */
	public String compute() {
		// convert input String to a char[]
		//string转为char[]
		// convert that char[] to byte[]
		//char数组转为Byte数组
		// get the md5 digest as byte[]
		//获得md5 byte[]
		// bit-wise AND that byte[] with 0xff
		//转为16进制
		// prepend "0" to the output StringBuffer to make sure that we don't end up with
		// something like "e21ff" instead of "e201ff"
		char[] charArray = this.inStr.toCharArray();
		byte[] byteArray = new byte[charArray.length];
		for (int i = 0; i < charArray.length; i++) {
			byteArray[i] = (byte) charArray[i];
		}
		byte[] md5Bytes = this.md5.digest(byteArray);
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16){
				hexValue.append("0");
			}
			hexValue.append(Integer.toHexString(val));
		}
		return hexValue.toString();
	}
	public static void main(String[] args) {
		MD5 md5 = new MD5("abc");
		String postString = md5.compute();
		System.out.println(postString);
		if (postString.equals("900150983cd24fb0d6963f7d28e17f72")) {
			System.out.println("true");
		} else
			System.out.println("false");
	}
}

 

做密码校验可以使用这个。