java md5加密類

import java.security.MessageDigest;


public class md5 {


    private String inStr;
    private MessageDigest md5;


public md5 (String inStr) {
this.inStr = inStr;
try {
this.md5 = MessageDigest.getInstance("MD5");
} catch (Exception e){
System.out.println(e.toString());
e.printStackTrace();
}
}


public String compute() {
char[] charArray = this.inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];


for (int i=0; i<charArray.length; i++) {
byteArray[i] = (byte) charArray[i];
}


byte[] md5Bytes = this.md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();


for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}


public static void main(String[] args) {
md5 md5s=new md5("abc");
String postString = md5s.compute();
System.out.println(postString);
if(postString.equals("900150983cd24fb0d6963f7d28e17f72")){
System.out.println("true");
} else {
System.out.println("false");
}
}
}