My code review

package imp;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import tools.ConnectionManager;

import bean.User;
import dao.UserDao;
/*
用户操作功能类
*/
public class UserDaoImp implements UserDao {
    //数据库链接函数
    public Connection con = null;
    PreparedStatement ps = null;
    public ResultSet rs = null;
    /*
    添加用户
    */
    @Override
    public int insertUse(User user) {
        int result = 0;//结果集
        con = ConnectionManager.getConnection();
        String sql = "insert into user(uId,uName,uPassword,uPhone,uAddress,uBalance) values(?,?,?,?,?,?)";

        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, user.getuId());
            ps.setString(2, user.getuName());
            ps.setString(3, user.getuPassword());
            ps.setString(4, user.getuPhone());
            ps.setString(5, user.getuAddress());
            ps.setString(6, user.getuBalance());
            result = ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    /*
    检查用户登录
    */
    @Override
    public User checkUser(String uid, String upassword) {
        User user = new User();
        con = ConnectionManager.getConnection();
        String sql = "select * from user where uId=? and uPassword=?";//建立在用户名和密码是否匹配的基础上
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, uid);
            ps.setString(2, upassword);
            rs = ps.executeQuery();
            if (rs.next() == false) {
                user.setuId("00000000");
            } else {
                user.setuId("uId");
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return user;
    }
    /*
    搜索用户信息
    */
    @Override
    public User searchUser(String uid) {
        User user = new User();
        con = ConnectionManager.getConnection();
        String sql = "select * from user where uId=?";
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, uid);
            rs = ps.executeQuery();
            while (rs.next()) {
                user.setuId(rs.getString("uId"));
                user.setuName(rs.getString("uName"));
                user.setuPassword(rs.getString("uPassword"));
                user.setuAddress(rs.getString("uAddress"));
                user.setuPhone(rs.getString("uPhone"));
                user.setuBalance(rs.getString("uBalance"));
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return user;
    }
    /*
    列出用户列表信息
    */
    @Override
    public List<User> getAllUser() {
        Connection con = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        List<User> list = new ArrayList<User>();
        try {
            con = ConnectionManager.getConnection();
            ps = con.prepareStatement("select * from user");
            rs = ps.executeQuery();
            while (rs.next()) {
                User user = new User();
                user.setuId(rs.getString("uId"));
                user.setuName(rs.getString("uName"));
                user.setuAddress(rs.getString("uAddress"));
                user.setuPhone(rs.getString("uPhone"));
                user.setuBalance(rs.getString("uBalance"));
                list.add(user);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }
    /*
    更新管理员信息
    */
    @Override
    public int updateAdmin(String uid, User user) {
        int result = 0;
        con = ConnectionManager.getConnection();
        String sql = "UPDATE user SET uName=?, uPassword=?, uPhone=?, uAddress=?, uBalance=? WHERE `uId`=?;";//通过用户ID进行修改

        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, user.getuName());
            ps.setString(2, user.getuPassword());
            ps.setString(3, user.getuPhone());
            ps.setString(4, user.getuAddress());
            ps.setString(5, user.getuBalance());
            ps.setString(6, uid);
            result = ps.executeUpdate();
            if (result != 0) {
                result = 1;
            } else {
                result = 0;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    /*
    删除用户
    */
    @Override
    public int deleteUser(String uid) {
        int result = 0;
        con = ConnectionManager.getConnection();
        String sql = "DELETE FROM user WHERE uId=?";//通过用户ID的索引进行删除

        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, uid);
            result = ps.executeUpdate();
            if (result != 0) {
                result = 1;
            } else {
                result = 0;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    /*
    更新用户信息
    */
    @Override
    public int updateUser(String uid, User user) {
        int result = 0;
        con = ConnectionManager.getConnection();
        String sql = "UPDATE user SET uName=?, uPassword=?, uPhone=?, uAddress=? WHERE `uId`=?;";//通过用户ID进行更新

        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, user.getuName());
            ps.setString(2, user.getuPassword());
            ps.setString(3, user.getuPhone());
            ps.setString(4, user.getuAddress());
            ps.setString(5, uid);
            result = ps.executeUpdate();
            if (result != 0) {
                result = 1;
            } else {
                result = 0;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return result;
    }
    /*
    模糊查询
    */
    @Override
    public List fuzzySearchUser(String uname) {
        Connection con = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        List<User> list = new ArrayList<User>();
        try {
            con = ConnectionManager.getConnection();
            ps = con.prepareStatement("select * from user where uname like '%"+uname+"%'");//用uname参数执行模糊查询
            rs = ps.executeQuery();
            while (rs.next()) {
                User user = new User();
                user.setuId(rs.getString("uId"));
                user.setuName(rs.getString("uName"));
                user.setuAddress(rs.getString("uAddress"));
                user.setuPhone(rs.getString("uPhone"));
                user.setuBalance(rs.getString("uBalance"));
                list.add(user);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }
}

以我现在的水平看过去自己所未能发现的问题，求轻喷，如果可以，也帮我改进下我的不合理之处，不甚感谢！

1.代码注释不详细，每个类都没有明确写出功能（基本没有注释，上面的注释都是后来加上的，现在才养起这个习惯并坚持下去）
2.有些参数没有明确指定在哪里调用，可能会出现跑偏或用错函数的问题
3.java.util.*慎用（我觉得这不像写代码的，像拐卖人口的）
4.虽说只要实现了功能就好，可还是要注意顺序问题，最好有明确的顺序，可以更好地找到功能并对应
5.最好不要使用组合声明，应分开并注释这些声明分别对应哪些指定的函数操作。
6.入行时间太少，手太生，只关注了程序是否能跑起来，并未关注程序的严谨性和逻辑性。