续：manager包下的

/**
* 对用户完成增删改查的管理类，采用单例模式实现
* @author Administrator
*
*/
public class UserManager {

private static UserManager instance = new UserManager();

private UserDao userDao = null;

private UserManager() {
userDao = UserDaoFactory.getInstance().createUserDao();
}

public static UserManager getInstance() {
return instance;
}

/**
* 增加用户
* @param user user对象
*/
public void addUser(User user) {
Connection conn = null;
try {
conn = DB.getConn();
userDao.addUser(conn, user);
}catch(Exception e) {
e.printStackTrace();
}finally {
DB.closeConn(conn);
}
}

/**
* 根据用户代码查询
* @param userId 用户代码
* @return user对象
*/
public User findUserById(String userId) {
User user = null;
try {
user = userDao.findUserById(userId);
}catch(Exception e) {
e.printStackTrace();
}
return user;
}

/**
* 查询所有用户
* @return user对象列表
*/
public List findAllUserList() {
List userList = new ArrayList();
try {
userList = userDao.findAllUserList();
}catch(Exception e) {
e.printStackTrace();
}
return userList;
}

/**
* 根据UserId的集合进行删除
* @param userIds userId的集合
*/
public void deleteUsers(String[] userIdList) {
Connection conn = null;
try {
conn = DB.getConn();
userDao.deleteUsers(conn, userIdList);
}catch(Exception e) {
e.printStackTrace();
}finally {
DB.closeConn(conn);
}
}

/**
* 修改用户
* @param user user对象
*/
public void modifyUser(User user) {
Connection conn = null;
try {
conn = DB.getConn();
userDao.modifyUser(conn, user);
}catch(Exception e) {
e.printStackTrace();
}finally {
DB.closeConn(conn);
}
}
}