Update DBConnection.java

src/server/tools/DBConnection.java

@@ -1,26 +1,45 @@
 package server.tools;
 
 import java.sql.Connection;
+import java.sql.DriverManager;
 import java.sql.PreparedStatement;
+import java.sql.SQLException;
 
 public class DBConnection {
-	private String driverName;
-	private String url;
-	private String user;
-	private String password;
+	private final static String driverName = "com.mysql.cj.jdbc.Driver";
+	private final static String url = "jdbc:mysql://localhost:3306/lda?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
+	private final static String user = "root";
+	private final static String password = "516849";
 
 	// 加载驱动
 	static {
-
+		try {
+			Class.forName(driverName);
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
 	}
 
 	public static Connection getConnection() {
-
-		return null;
+		Connection connection = null;
+		try {
+			connection = DriverManager.getConnection(url, user, password);
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return connection;
 	}
 
 	public static void close(Connection con, PreparedStatement pst) {
-
+		try {
+			if (pst != null) {
+				pst.close();
+			}
+			if (con != null) {
+				con.close();
+			}
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
 	}
-
-}
+}