package com.hustner.md5.test;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Md5Encrypt {
/**
* Used building output as Hex
*/
private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D',
'E', 'F' };
/**
* 对字符串进行MD5加密
*
* @param text
* 明文
*
* @return 密文
*/
public static String md5(String text) {
MessageDigest msgDigest = null;
try {
//获取一个MD5的实例
msgDigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(
"System doesn't support MD5 algorithm.");
}
try {
//一种是项目编码格式，数据库编码格式
msgDigest.update(text.getBytes("UTF-8")); // 注意改接口是按照指定编码形式签名
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(
"System doesn't support your EncodingException.");
}
//整理好数据并且返回
byte[] bytes = msgDigest.digest();
String md5Str = new String(encodeHex(bytes));
return md5Str;
}
/**
* 对字符串进行MD5加密
*
* @param text
* 明文
*
* @return 密文
*/
public static String md5gj(String text) {
MessageDigest msgDigest = null;
try {
msgDigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(
"System doesn't support MD5 algorithm.");
}
try {
msgDigest.update(text.getBytes("GB2312")); // 注意改接口是按照指定编码形式签名
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(
"System doesn't support your EncodingException.");
}
byte[] bytes = msgDigest.digest();
String md5Str = new String(encodeHex(bytes));
return md5Str;
}
public static char[] encodeHex(byte[] data) {
int l = data.length;
System.out.println("长度："+l);
char[] out = new char[l << 1];
System.out.println("移位："+(l << 2));
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
out[j++] = DIGITS[0x0F & data[i]];
}
return out;
}
public static void main(String[] args) {
System.out.println(Md5Encrypt.md5("123456" + "wlp.cn"));
}
}
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