MD5--Utils（工具类）

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import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5 {

public static String getVal(String plainText) {    try {        MessageDigest md = MessageDigest.getInstance("MD5");        try {            md.update(plainText.getBytes("GB2312"));        } catch (UnsupportedEncodingException e) {            e.printStackTrace();            return null;        }        byte b[] = md.digest();        int i;        StringBuffer buf = new StringBuffer("");        for (int offset = 0; offset < b.length; offset++) {            i = b[offset];            if (i < 0)                i += 256;            if (i < 16)                buf.append("0");            buf.append(Integer.toHexString(i));        }        return buf.toString();    } catch (NoSuchAlgorithmException e) {                  e.printStackTrace();        return null;    }}public static String getVal_GBK(String plainText) {    try {        MessageDigest md = MessageDigest.getInstance("MD5");        md.update(plainText.getBytes("GBK"));        byte b[] = md.digest();        int i;        StringBuffer buf = new StringBuffer("");        for (int offset = 0; offset < b.length; offset++) {            i = b[offset];            if (i < 0)                i += 256;            if (i < 16)                buf.append("0");            buf.append(Integer.toHexString(i));        }        return buf.toString();    } catch (NoSuchAlgorithmException e) {        e.printStackTrace();        return null;    }    catch (UnsupportedEncodingException e) {        e.printStackTrace();        return null;    }}public static String getVal_UTF8(String plainText) {    try {        MessageDigest md = MessageDigest.getInstance("MD5");        md.update(plainText.getBytes("UTF-8"));        byte b[] = md.digest();        int i;        StringBuffer buf = new StringBuffer("");        for (int offset = 0; offset < b.length; offset++) {            i = b[offset];            if (i < 0)                i += 256;            if (i < 16)                buf.append("0");            buf.append(Integer.toHexString(i));        }        return buf.toString().toUpperCase();    } catch (NoSuchAlgorithmException e) {        e.printStackTrace();        return null;    }    catch (UnsupportedEncodingException e) {        e.printStackTrace();        return null;    }}public final static String getMessageDigest(byte[] buffer) {    char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };    try {        MessageDigest mdTemp = MessageDigest.getInstance("MD5");        mdTemp.update(buffer);        byte[] md = mdTemp.digest();        int j = md.length;        char str[] = new char[j * 2];        int k = 0;        for (int i = 0; i < j; i++) {            byte byte0 = md[i];            str[k++] = hexDigits[byte0 >>> 4 & 0xf];            str[k++] = hexDigits[byte0 & 0xf];        }        return new String(str);    } catch (Exception e) {        return null;    }}

}

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