java中加密的实现方法（MD5，MD2，SHA）

import java.security.MessageDigest; 
 
import javax.xml.bind.annotation.adapters.HexBinaryAdapter; 
 
public class Main { 
 
  static String src = "Hello,sahadev!"; 
 
  public static void main(String[] args) { 
    MD5(); 
    MD2(); 
    SHA(); 
  } 
 
  /** 
   * MD5加密 
   */ 
  public static void MD5() { 
    try { 
      // 获取MD5加密工具 
      MessageDigest md = MessageDigest.getInstance("MD5"); 
      // 加密 
      byte[] digest = md.digest(src.getBytes()); 
      // 获取二进制十六进制互转工具 
      HexBinaryAdapter hexBinaryAdapter = new HexBinaryAdapter(); 
      // 将二进制数组转换为十六进制字符串 
      String marshal = hexBinaryAdapter.marshal(digest); 
      // 输出结果 
      System.out.println(marshal); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
 
  /** 
   * MD2加密 
   */ 
  public static void MD2() { 
    try { 
      // 获取MD2加密工具 
      MessageDigest md = MessageDigest.getInstance("MD2"); 
      // 加密 
      byte[] digest = md.digest(src.getBytes()); 
      // 获取二进制十六进制互转工具 
      HexBinaryAdapter hexBinaryAdapter = new HexBinaryAdapter(); 
      // 将二进制数组转换为十六进制字符串 
      String marshal = hexBinaryAdapter.marshal(digest); 
      // 输出结果 
      System.out.println(marshal); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
 
  public static void SHA() { 
    try { 
      // 获取MD2加密工具 
      MessageDigest md = MessageDigest.getInstance("SHA"); 
      // 加密 
      byte[] digest = md.digest(src.getBytes()); 
      // 获取二进制十六进制互转工具 
      HexBinaryAdapter hexBinaryAdapter = new HexBinaryAdapter(); 
      // 将二进制数组转换为十六进制字符串 
      String marshal = hexBinaryAdapter.marshal(digest); 
      // 输出结果 
      System.out.println(marshal); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
 
} 

MD5 : 8FC69C57ACC2258C7B4A9D39DC4C940B 
MD2 : 9EAF08289903A29C3C58D2AAA25BD83D 
SHA : 1B1330BFC6257FC9F4B4ED5CB605FA4109608CCA