diff --git a/ticketing-master/src/com/cn/dao/impl/AdminDaoImpl.java b/ticketing-master/src/com/cn/dao/impl/AdminDaoImpl.java
index c8ca805..45e9562 100644
--- a/ticketing-master/src/com/cn/dao/impl/AdminDaoImpl.java
+++ b/ticketing-master/src/com/cn/dao/impl/AdminDaoImpl.java
@@ -1,162 +1,141 @@
-package com.cn.dao.impl;
+package com.cn.dao.impl; // 数据访问对象实现包
 
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.sql.Timestamp;
-import java.util.ArrayList;
-import java.util.List;
+import java.sql.*; // 导入SQL相关类
+import java.util.*; // 导入集合相关类
 
-import com.cn.dao.AdminDao;
-import com.cn.domain.Admin;
-import com.cn.util.JDBCUtil;
+import com.cn.dao.AdminDao; // 导入AdminDao接口
+import com.cn.domain.Admin; // 导入Admin实体类
+import com.cn.util.JDBCUtil; // 导入JDBC工具类
 
 /**
- * @className AdminDaoImpl
- * @description
- * @author lxs
- * @date 2019年9月1日
+ * 实现AdminDao接口，提供管理员数据访问操作。
  */
 public class AdminDaoImpl implements AdminDao {
-	private Connection conn = null;
-	private PreparedStatement pstmt = null;
-	private ResultSet rs = null;
+    private Connection conn = null; // 数据库连接
+    private PreparedStatement pstmt = null; // 预编译语句
+    private ResultSet rs = null; // 结果集
 
-	@Override
-	public int add(Admin admin) throws SQLException {
-		String sql = "insert into admins (username,password,creattime,flag,isuse,logintime) VALUES (?,?,?,?,?,?)";
+    @Override
+    public int add(Admin admin) throws SQLException { // 添加管理员
+        String sql = "insert into admins (username,password,creattime,flag,isuse,logintime) VALUES (?,?,?,?,?,?)";
+        conn = JDBCUtil.getConnection(); // 获取连接
+        pstmt = conn.prepareStatement(sql); // 准备SQL语句
+        pstmt.setObject(1, admin.getUserName()); // 设置参数
+        pstmt.setObject(2, admin.getPassword());
+        pstmt.setObject(3, admin.getCreatTime());
+        pstmt.setObject(4, admin.getFlag());
+        pstmt.setObject(5, admin.getIsUse());
+        pstmt.setObject(6, admin.getLoginTime());
+        int status = pstmt.executeUpdate(); // 执行插入
+        closeResources(); // 关闭资源
+        return status;
+    }
 
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		pstmt.setObject(1, admin.getUserName());
-		pstmt.setObject(2, admin.getPassword());
-		pstmt.setObject(3, admin.getCreatTime());
-		pstmt.setObject(4, admin.getFlag());
-		pstmt.setObject(5, admin.getIsUse());
-		pstmt.setObject(6, admin.getLoginTime());
-		// 执行添加语句
-		int status = pstmt.executeUpdate();
-		// 关流
-		pstmt.close();
-		conn.close();
-		
-		return status;
-	}
+    @Override
+    public int delete(int adminId) throws SQLException { // 删除管理员
+        String sql = "delete from admins where adminid=?";
+        conn = JDBCUtil.getConnection();
+        pstmt = conn.prepareStatement(sql);
+        pstmt.setObject(1, adminId);
+        int status = pstmt.executeUpdate();
+        closeResources();
+        return status;
+    }
 
-	@Override
-	public int delete(int adminId) throws SQLException {
-		String sql = "delete from admins where adminid=?";
-		
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		pstmt.setObject(1, adminId);
-		// 执行删除语句
-		int status = pstmt.executeUpdate();
-		
-		pstmt.close();
-		conn.close();
-		
-		return status;
-	}
+    @Override
+    public int update(Admin admin) throws SQLException { // 更新管理员信息
+        String sql = "update admins set username=?,password=?,flag=?,isuse=?,logintime=? where adminid=?";
+        conn = JDBCUtil.getConnection();
+        pstmt = conn.prepareStatement(sql);
+        pstmt.setObject(1, admin.getUserName());
+        pstmt.setObject(2, admin.getPassword());
+        pstmt.setObject(3, admin.getFlag());
+        pstmt.setObject(4, admin.getIsUse());
+        pstmt.setObject(5, admin.getLoginTime());
+        pstmt.setObject(6, admin.getAdminId());
+        int status = pstmt.executeUpdate();
+        closeResources();
+        return status;
+    }
 
-	
-	@Override
-	public int update(Admin admin) throws SQLException {
-		String sql = "update admins set username=?,password=?,flag=?,isuse=?,logintime=? where adminid=?";
-		
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		pstmt.setObject(1, admin.getUserName());
-		pstmt.setObject(2, admin.getPassword());
-		pstmt.setObject(3, admin.getFlag());
-		pstmt.setObject(4, admin.getIsUse());
-		pstmt.setObject(5, admin.getLoginTime());
-		pstmt.setObject(6, admin.getAdminId());
-		
-		int status = pstmt.executeUpdate();
-		
-		pstmt.close();
-		conn.close();
-		
-		return status;
-	}
+    @Override
+    public Admin getById(int adminId) throws SQLException { // 根据ID获取管理员
+        String sql = "select * from admins where adminid=?";
+        conn = JDBCUtil.getConnection();
+        pstmt = conn.prepareStatement(sql);
+        pstmt.setObject(1, adminId);
+        rs = pstmt.executeQuery();
+        Admin admin = null;
+        if (rs.next()) {
+            admin = resultSetToAdmin(rs); // 将结果集转换为Admin对象
+        }
+        closeResources();
+        return admin;
+    }
 
-	@Override
-	public Admin getById(int adminId) throws SQLException {
-		String sql = "select * from admins where adminid=?";
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		pstmt.setObject(1, adminId);
-		rs = pstmt.executeQuery();
-		Admin admin = null;
-		while (rs.next()) {
-			String userName = rs.getString("userName");
-			String password = rs.getString("password");
-			Timestamp creatTime = rs.getTimestamp("creatTime");
-			int flag = rs.getInt("flag");
-			int isUse = rs.getInt("isUse");
-			Timestamp loginTime = rs.getTimestamp("loginTime");
-			admin = new Admin(adminId, userName, password, creatTime, flag, isUse, loginTime);
-		}
-		
-		rs.close();
-		pstmt.close();
-		conn.close();
-		
-		return admin;
-	}
+    @Override
+    public List<Admin> getAll() throws SQLException { // 获取所有管理员
+        String sql = "select * from admins";
+        conn = JDBCUtil.getConnection();
+        pstmt = conn.prepareStatement(sql);
+        rs = pstmt.executeQuery();
+        List<Admin> admins = new ArrayList<>();
+        while (rs.next()) {
+            admins.add(resultSetToAdmin(rs)); // 将结果集转换为Admin对象并添加到列表
+        }
+        closeResources();
+        return admins;
+    }
 
-	@Override
-	public List<Admin> getAll() throws SQLException{
-		String sql = "select * from admins";
-		
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		rs = pstmt.executeQuery();
-		
-		List<Admin> admins = new ArrayList<Admin>();
-		while (rs.next()) {
-			int adminId = rs.getInt("adminId");
-			String userName = rs.getString("userName");
-			String password = rs.getString("password");
-			Timestamp creatTime = rs.getTimestamp("creatTime");
-			int flag = rs.getInt("flag");
-			int isUse = rs.getInt("isUse");
-			Timestamp loginTime = rs.getTimestamp("loginTime");
-			Admin admin = new Admin(adminId, userName, password, creatTime, flag, isUse, loginTime);
-			admins.add(admin);
-		}
-		
-		rs.close();
-		pstmt.close();
-		conn.close();
-		
-		return admins;
-	}
+    @Override
+    public Admin getByName(String userName) throws SQLException { // 根据用户名获取管理员
+        String sql = "select * from admins where username=?";
+        conn = JDBCUtil.getConnection();
+        pstmt = conn.prepareStatement(sql);
+        pstmt.setObject(1, userName);
+        rs = pstmt.executeQuery();
+        Admin admin = null;
+        if (rs.next()) {
+            admin = resultSetToAdmin(rs); // 将结果集转换为Admin对象
+        }
+        closeResources();
+        return admin;
+    }
 
-	@Override
-	public Admin getByName(String userName) throws SQLException {
-		String sql = "select * from admins where username=?";
-		conn = JDBCUtil.getConnection();
-		pstmt = conn.prepareStatement(sql);
-		pstmt.setObject(1, userName);
-		rs = pstmt.executeQuery();
-		Admin admin = null;
-		while (rs.next()) {
-			int adminId = rs.getInt("adminId");
-			String password = rs.getString("password");
-			Timestamp creatTime = rs.getTimestamp("creatTime");
-			int flag = rs.getInt("flag");
-			int isUse = rs.getInt("isUse");
-			Timestamp loginTime = rs.getTimestamp("loginTime");
-			admin = new Admin(adminId, userName, password, creatTime, flag, isUse, loginTime);
-		}
-		
-		rs.close();
-		pstmt.close();
-		conn.close();
-		
-		return admin;
-	}
+    // 将结果集转换为Admin对象的方法
+    private Admin resultSetToAdmin(ResultSet rs) throws SQLException {
+        int adminId = rs.getInt("adminId");
+        String userName = rs.getString("userName");
+        String password = rs.getString("password");
+        Timestamp creatTime = rs.getTimestamp("creatTime");
+        int flag = rs.getInt("flag");
+        int isUse = rs.getInt("isUse");
+        Timestamp loginTime = rs.getTimestamp("loginTime");
+        return new Admin(adminId, userName, password, creatTime, flag, isUse, loginTime);
+    }
+
+    // 关闭数据库资源的方法
+    private void closeResources() {
+        if (rs != null) {
+            try {
+                rs.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+        if (pstmt != null) {
+            try {
+                pstmt.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+        if (conn != null) {
+            try {
+                conn.close();
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
 }