Question

package dbb;

import java.sql.*;

public class test {
    public static void main (String[] args) {
        String url = "jdbc:mysql://localhost:3306/test";
        String user = "root";
        String pass = "1234";

        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            System.out.println("Driver Searched");
            conn = DriverManager.getConnection(url, user, pass);
            System.out.println("Connection Succeed" + conn);
        } catch (ClassNotFoundException e) {
            System.out.println("Driver Not Searched");
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

我在java上创建了这个代码，但是有一些错误。例如，

它显示已搜索到驱动程序，但连接仍然失败。

如何解决错误？

Answer 1

public static void main(String[] args) {

    String url = "jdbc:mysql://localhost:3306/test";
    String user = "root";
    String pass = "Admin@123";

    java.sql.Connection conn = null;

    try {
        Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Driver Searched");
        conn = DriverManager.getConnection(url, user, pass);
        System.out.println("Connection Succeed" + conn);
    } catch (ClassNotFoundException e) {
        System.out.println("Driver Not Searched");
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

它在mysql-connector-java-5.1.6jar的系统中正常运行。可能这是MySql驱动程序的问题。

您可以尝试使用以下内容：您可能需要在jdbc url。中明确指定时区：

String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";

Answer 2

正如评论中建议的那样，使用非ssl连接与最新的驱动程序，你应该使用下面的代码：

package dbb;
import java.sql.*;

public class test {
public static void main (String[] args) {
    String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
    String user = "root";
    String pass = "1234";

    Connection conn = null;

    try {
        Class.forName("com.mysql.cj.jdbc.Driver");
        System.out.println("Driver Searched");
        conn = DriverManager.getConnection(url, user, pass);
        System.out.println("Connection Succeed" + conn);
    } catch (ClassNotFoundException e) {
        System.out.println("Driver Not Searched");
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}
}

我想在java上连接到db，但是有一些错误

2 个答案: