加密算法（java版）

先来一发最常常使用的消息摘要算法第五版←_←就是MD5：

package my.util.encryp.md5;

import java.security.MessageDigest;

public class MD5Utils {

	private String inStr;
	private MessageDigest md5;

	public MD5Utils(String inStr) {
		this.inStr = inStr;
		try {
			this.md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			System.out.println(e.toString());
			e.printStackTrace();
		}
	}

	public String compute() {
		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) {
		MD5Utils md5 = new MD5Utils("123456");
		String postString = md5.compute();
		System.out.println("→:" + postString);
	}
}
package my.util.encr