将Java连接到Amazon服务器中的MYSQL数据库

Question

我正在尝试将我的Java代码与Amazon RDS中的 mysql DB连接起来，我正在使用以下代码：

        try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        connection = DriverManager.getConnection(
        "jdbc:mysql://HOST:port_number/DB_name","DB_username", "DB_pass");
        st = connection.createStatement();
        rs = st.executeQuery("SELECT * FROM table name WHERE id = 1");
    } catch (Exception e) {
        System.out.println("DB error : " + e);
    }

我在运行它时遇到此错误：

DB error : java.sql.SQLException: Unable to connect to any hosts due to exception: java.net.SocketException: java.net.SocketException: Permission denied: connect

** BEGIN NESTED EXCEPTION ** 

java.net.SocketException
MESSAGE: java.net.SocketException: Permission denied: connect

STACKTRACE:

java.net.SocketException: java.net.SocketException: Permission denied: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:143)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:225)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1805)
at com.mysql.jdbc.Connection.<init>(Connection.java:452)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:411)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DB.<init>(DB.java:15)
at subgroup.main(subgroup.java:72)


** END NESTED EXCEPTION **

有任何想法吗 ！！

Answer 1

您需要从尝试读取数据库的位置授予对计算机的访问权限。

另外，您应该使用命令提示符授予对IP的访问权限。

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html

Answer 2

我改写您的命令，因为您将connection变量设置为drivermanager，但在声明中使用con ？ 连接内部的字符串用实际值替换，例如

connect = DriverManager.getConnection("jdbc:mysql://localhost:3306", "<your DBUsername>", "<your DB Password>");

下次不要复制粘贴，了解代码如何工作

try {
        Class.forName("com.mysql.jdbc.Driver");
        connection = DriverManager.getConnection(
        "jdbc:mysql://HOST:port_number/DB_name","DB_username", "DB_pass");
        st = connection.createStatement();
        rs = st.executeQuery("SELECT * FROM table name WHERE id = 1");
    } catch (Exception e) {
        System.out.println("DB error : " + e);
    }

Answer 3

就我而言，问题是我正在使用从仿真器到本地主机的连接。 如果您使用模拟器将localhost用作本地主机，请不要在连接字符串中使用localhost，127.0.0.1，而应使用：

10.0.2.2

希望这可以帮助