diff --git a/UserDao b/UserDao
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+++ b/UserDao
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+package dao;
+
+import model.User;
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanHandler;
+import org.apache.commons.dbutils.handlers.BeanListHandler;
+import org.apache.commons.dbutils.handlers.ScalarHandler;
+
+import java.sql.SQLException;
+import java.util.List;
+import utils.DataSourceUtils;
+public class UserDao {
+    public void addUser(User user) throws SQLException {
+        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());
+        String sql = "insert into user(username,email,password,name,phone,address,isadmin,isvalidate) values(?,?,?,?,?,?,?,?)";
+        r.update(sql,user.getUsername(),user.getEmail(),user.getPassword(),user.getName(),user.getPhone(),user.getAddress(),user.isIsadmin(),user.isIsvalidate());
+    }
+    public boolean isUsernameExist(String username) throws SQLException {
+        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());
+        String sql = "select * from user where username = ?";
+        User u = r.query(sql, new BeanHandler<User>(User.class),username);
+        if(u==null) {
+            return false;
+        }else {
+            return true;
+        }
+    }
+    public boolean isEmailExist(String email) throws SQLException {
+        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());
+        String sql = "select * from user where email = ?";
+        User u = r.query(sql, new BeanHandler<User>(User.class),email);
+        if(u==null) {
+            return false;
+        }else {
+            return true;
+        }
+    }
+    public User selectByUsernamePassword(String username,String password) throws SQLException {
+        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());
+        String sql = "select * from user where username=? and password=?";
+        return r.query(sql, new BeanHandler<User>(User.class),username,password);
+    }
+    public User selectByEmailPassword(String email,String password) throws SQLException {
+        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSourc
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