java MD5加密关于中文不一致问题

public final class MD5 {

/**
* 默认构造方法
*/
private MD5() {

}

/**
* 获得MD5加密字符串
*
* @param source 源字符串
*
* @return 加密后的字符串
*
*/
public static String getMD5(String source) {
String mdString = null;
if (source != null) {
try {
//关键是这句

mdString = getMD5(source.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return mdString;
}

/**
* 获得MD5加密字符串
*
* @param source 源字节数组
*
* @return 加密后的字符串
*/
public static String getMD5(byte[] source) {
String s = null;
char [] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F'};
final int temp = 0xf;
final int arraySize = 32;
final int strLen = 16;
final int offset = 4;
try {
java.security.MessageDigest md = java.security.MessageDigest
.getInstance("MD5");
md.update(source);
byte [] tmp = md.digest();
char [] str = new char[arraySize];
int k = 0;
for (int i = 0; i < strLen; i++) {
byte byte0 = tmp[i];
str[k++] = hexDigits[byte0 >>> offset & temp];
str[k++] = hexDigits[byte0 & temp];
}
s = new String(str);
} catch (Exception e) {
e.printStackTrace();
}
return s;
}

}