对J2EE中的DAO组件编写单元测试

　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;

  }