java编程下字符串的16位,32位md5加密实现方法

如下所示：

package cn.sunzn.md5;

import java.security.messagedigest;
import java.security.nosuchalgorithmexception;

public class str2md5 {

  public static void main(string[] args) {
    md5("sunzn");
  }

  private static string md5(string sourcestr) {
    string result = "";
    try {
      messagedigest md = messagedigest.getinstance("md5");
      md.update(sourcestr.getbytes());
      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));
      }
      result = buf.tostring();
      system.out.println("md5(" + sourcestr + ",32) = " + result);
      system.out.println("md5(" + sourcestr + ",16) = " + buf.tostring().substring(8, 24));
    } catch (nosuchalgorithmexception e) {
      system.out.println(e);
    }
    return result;
  }
}

md5(sunzn,32) = 40379db889f9124819228947faaeb1f7
md5(sunzn,16) = 89f9124819228947

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