public static Object query(Class clazz, Serializable id);
  public static void createEntity(Object entity);
  public static Object queryForObject(String hql, Object[] params);
  public static List queryForList(String hql, Object[] params);  

　　在此不再多述。

　　实体类User使用JPA注解，代表一个用户：

  @Entity
  @Table(name="T_USER")
  public class User {
  public static final  String REGEX_USERNAME = "[a-z0-9][a-z0-9//-]{1,18}[a-z0-9]";
  public static final  String REGEX_PASSWORD = "[a-f0-9]{32}";
  public static final  String REGEX_EMAIL = "([0-9a-zA-Z]([-.//w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-//w]*[0-9a-zA-Z]//.)+[a-zA-Z]{2,9})";    private String  username;     // 用户名 
  private String  password;     // MD5口令 
  private boolean  admin;       // 是否是管理员 
  private String  email;        // 电子邮件 
  private int  emailValidation; // 电子邮件验证码 
  private long  createdDate;    // 创建时间 
  private long  lockDate;       // 锁定时间     public User() {}    public User(String  username, String password, boolean admin, long lastSignOnDate) {
  this.username = username;
  this.password =  password;
  this.admin = admin;
  }    @Id
  @Column(updatable=false,  length=20)
  @Pattern(regex=REGEX_USERNAME)
  public String  getUsername() { return username; }
  public void setUsername(String  username) { this.username = username; }    @Column(nullable=false,  length=32)
  @Pattern(regex=REGEX_PASSWORD)
  public String  getPassword() { return password; }
  public void  setPassword(String password) { this.password = password; }    @Column(nullable=false,  length=50)
  @Pattern(regex=REGEX_EMAIL)
  public String getEmail()  { return email; }
  public void  setEmail(String email) { this.email = email; }    @Column(nullable=false)
  public boolean getAdmin()  { return admin; }
  public void  setAdmin(boolean admin) { this.admin = admin; }    @Column(nullable=false,  updatable=false)
  public long  getCreatedDate() { return createdDate; }
  public void  setCreatedDate(long createdDate) { this.createdDate = createdDate; }    @Column(nullable=false)
  public int  getEmailValidation() { return emailValidation; }
  public void  setEmailValidation(int emailValidation) { this.emailValidation =  emailValidation; }    @Column(nullable=false)
  public long getLockDate()  { return lockDate; }
  public void  setLockDate(long lockDate) { this.lockDate = lockDate; }   @Transient
  public boolean  getEmailValidated() { return emailValidation==0; }    @Transient
  public boolean  getLocked() {
  return !admin  && lockDate>0 && lockDate>System.currentTimeMillis();
  }
  }  

　　实体类PasswordTicket代表一个重置口令的请求：

  @Entity
  @Table(name="T_PWDT")
  public class PasswordTicket {
  private String id;
  private User user;
  private String ticket;
  private long createdDate;  @Id
  @Column(nullable=false, updatable=false,  length=32)
  @GeneratedValue(generator="system-uuid")
  @GenericGenerator(name="system-uuid",  strategy="uuid")
  public String getId() {  return id; }
  protected void  setId(String id) { this.id = id; }  @ManyToOne
  @JoinColumn(nullable=false, updatable=false)
  public User getUser() {  return user; }
  public void setUser(User  user) { this.user = user; }  @Column(nullable=false,  updatable=false, length=32)
  public String getTicket()  { return ticket; }
  public void  setTicket(String ticket) { this.ticket = ticket; }  @Column(nullable=false,  updatable=false)
  public long  getCreatedDate() { return createdDate; }
  public void  setCreatedDate(long createdDate) { this.createdDate = createdDate; }
  }  

　　UserDao接口定义了对用户的相关操作：

　public interface UserDao {
  User  queryForSignOn(String username);
  User queryUser(String  username);
  void createUser(User  user);
  void updateUser(User  user);
  boolean  updateEmailValidation(String username, int ticket);
  String  createPasswordTicket(User user);
  boolean  updatePassword(String username, String oldPassword, String newPassword);
  boolean  queryResetPassword(User user, String ticket);
  boolean  updateResetPassword(User user, String ticket, String password);
  void updateLock(User  user, long lockTime);
  void updateUnlock(User  user);
  }  

　　UserDaoImpl是其实现类：

　public class UserDaoImpl implements UserDao {
  public User  queryForSignOn(String username) {
  User user =  queryUser(username);
  if(user.getLocked())
  throw new  LockException(user.getLockDate());
  return user;
  }　public User  queryUser(String username) {
  return (User)  HibernateUtil.query(User.class, username);
  }　public void  createUser(User user) {
  user.setEmailValidation((int)(Math.random() * 1000000) + 0xf);
  HibernateUtil.createEntity(user);
  }
  // 其余方法略 
  ...
  }  

　　由于将Hibernate事务绑定在Thread上，因此，实际的客户端调用DAO组件时，还必须加入事务代码：

　Transaction tx =  HibernateUtil.getCurrentSession().beginTransaction();
  try {
  dao.xxx();
  tx.commit();
  }
  catch(Exception e) {
  tx.rollback();
  throw e;
  }

         
 　
   

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