javaMD5加密

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5_1 {
     public static String str;
     //public static String shu = "123456";

      public void md5s(String plainText) {
          try {
           MessageDigest md = MessageDigest.getInstance("MD5");
           md.update(plainText.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));
           }
           str = buf.toString();
           System.out.println("result: " + buf.toString());// 32位的加密
           System.out.println("result: " + str.substring(8, 24));// 16位的加密
          } catch (NoSuchAlgorithmException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();

          }
         }

//       public static void main(String agrs[]) {
//        md5 md51 = new md5();
//        md51.md5s("123456");//加密4
//       }


    public static void main(String[] args){
        String shu = "admin";

        MD5_1 md51 = new MD5_1();
        md51.md5s(shu);


           String url = "jdbc:mysql://localhost:3306/wh_viss";
           String name = "root";
           String password = "ccnu";
           //String Username;
           Connection conn=null;
           PreparedStatement ps=null;
           Statement stmt=null;
           ResultSet rs=null;
           try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(url,name,password);
            System.out.println("重置密码的数据库连接成功！");
         ps = conn.prepareStatement("insert into users values(?,?,?,?)");
         //md5 md51 = new md5();
       //   InsertDB.md5s("123456");//加密4
         ps.setString(1,"5");
         ps.setString(2,"zhangsan");
         ps.setString(3,str.substring(8, 24));
         ps.setString(4,"[email protected]");
         //rs= ps.executeQuery();
         ps.executeUpdate();
//      ps = conn.prepareStatement("select * from user");
//
//      rs= ps.executeQuery();
//


           } catch (ClassNotFoundException e) {
            e.printStackTrace();
    System.out.println("数据库链接失败1");
          }catch(SQLException e){
              e.printStackTrace();
    System.out.println("数据库链接失败2");
          }finally{
              try {
              if(rs!=null){
                  rs.close();
              }
              if(ps!=null){
                  ps.close();
              }
              if(conn!=null){
                  conn.close();
              }
             }catch (SQLException e) {
                    e.printStackTrace();
            }
          }
          //return Username;




        System.out.println("调用了重置页面！");


       }


}