大家好，又见面了，我是你们的朋友全栈君。
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
//import sun.security.provider.MD5;
/**
* 简单计算MD5
*
* @author agapple 2015年3月26日 下午8:45:47
* @since 5.1.19
*/
public class MD5Utils {
private static final Log log = LogFactory.getLog(MD5Utils.class);
private static char[] digits = { ‘0’, ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’, ‘8’, ‘9’, ‘a’, ‘b’, ‘c’,
‘d’, ‘e’, ‘f’ };
private static Map rDigits = new HashMap(16);
static {
for (int i = 0; i < digits.length; ++i) {
rDigits.put(digits[i], i);
}
}
private static MD5Utils me = new MD5Utils();
private MessageDigest mHasher;
private ReentrantLock opLock = new ReentrantLock();
private MD5Utils(){
try {
mHasher = MessageDigest.getInstance(“md5”);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static MD5Utils getInstance() {
return me;
}
public String getMD5String(String content) {
return bytes2string(hash(content));
}
public String getMD5String(byte[] content) {
return bytes2string(hash(content));
}
public byte[] getMD5Bytes(byte[] content) {
return hash(content);
}
/**
* 对字符串进行md5
*
* @param str
* @return md5 byte[16]
*/
public byte[] hash(String str) {
opLock.lock();
try {
byte[] bt = mHasher.digest(str.getBytes(“UTF-8”));
if (null == bt || bt.length != 16) {
throw new IllegalArgumentException(“md5 need”);
}
return bt;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(“unsupported utf-8 encoding”, e);
} finally {
opLock.unlock();
}
}
/**
* 对二进制数据进行md5
*
* @param str
* @return md5 byte[16]
*/
public byte[] hash(byte[] data) {
opLock.lock();
try {
byte[] bt = mHasher.digest(data);
if (null == bt || bt.length != 16) {
throw new IllegalArgumentException(“md5 need”);
}
return bt;
} finally {
opLock.unlock();
}
}
/**
* 将一个字节数组转化为可见的字符串
*
* @param bt
* @return
*/
public String bytes2string(byte[] bt) {
int l = bt.length;
char[] out = new char[l << 1];
for (int i = 0, j = 0; i < l; i++) {
out[j++] = digits[(0xF0 & bt[i]) >>> 4];
out[j++] = digits[0x0F & bt[i]];
}
if (log.isDebugEnabled()) {
log.debug(“[hash]” + (new String(out)));
}
return new String(out);
}
/**
* 将字符串转换为bytes
*
* @param str
* @return byte[]
*/
public byte[] string2bytes(String str) {
if (null == str) {
throw new IllegalArgumentException(“str is null”);
}
if (str.length() != 32) {
throw new IllegalArgumentException(“str.length() != 32”);
}
byte[] data = new byte[16];
char[] chs = str.toCharArray();
for (int i = 0; i < 16; ++i) {
int h = rDigits.get(chs[i * 2]).intValue();
int l = rDigits.get(chs[i * 2 + 1]).intValue();
data[i] = (byte) ((h & 0x0F) << 4 | (l & 0x0F));
}
return data;
}
}
以上代码就是用于md5的算法
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