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package org.frameworkset.wx.common.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Util {
public static String toMD5(String str){
try {
MessageDigest messageDigest =MessageDigest.getInstance("MD5");
byte[] inputByteArray = str.getBytes();
messageDigest.update(inputByteArray);
byte[] resultByteArray = messageDigest.digest();
return byteArrayToHex(resultByteArray);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return "false";
}
}
public static String byteArrayToHex(byte[] byteArray) {
// 首先初始化一个字符数组，用来存放每个16进制字符
char[] hexDigits = {'0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F' };
// new一个字符数组，这个就是用来组成结果字符串的（解释一下：一个byte是八位二进制，也就是2位十六进制字符（2的8次方等于16的2次方））
char[] resultCharArray =new char[byteArray.length * 2];
// 遍历字节数组，通过位运算（位运算效率高），转换成字符放到字符数组中去
int index = 0;
for (byte b : byteArray) {
resultCharArray[index++] = hexDigits[b>>> 4 & 0xf];
resultCharArray[index++] = hexDigits[b& 0xf];
}
// 字符数组组合成字符串返回
return new String(resultCharArray);
}
public static String toMD51(String str){
try {
MessageDigest messageDigest =MessageDigest.getInstance("MD5");
byte[] inputByteArray = str.getBytes();
messageDigest.update(inputByteArray);
byte[] resultByteArray = messageDigest.digest();
return byteArrayToHex1(resultByteArray);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return "false";
}
}
public static String byteArrayToHex1(byte[] byteArray) {
// 首先初始化一个字符数组，用来存放每个16进制字符
char[] hexDigits = {'0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f' };
// new一个字符数组，这个就是用来组成结果字符串的（解释一下：一个byte是八位二进制，也就是2位十六进制字符（2的8次方等于16的2次方））
char[] resultCharArray =new char[byteArray.length * 2];
// 遍历字节数组，通过位运算（位运算效率高），转换成字符放到字符数组中去
int index = 0;
for (byte b : byteArray) {
resultCharArray[index++] = hexDigits[b>>> 4 & 0xf];
resultCharArray[index++] = hexDigits[b& 0xf];
}
// 字符数组组合成字符串返回
return new String(resultCharArray);
}
}