Java无法通过NetBean IDE连接到MySQL数据库

Question

所有。

我在使用Netbeans时遇到了一个奇怪的问题。 由于某些原因，netbeans构建的jar文件无法连接到mysql服务器。

但是，我可以使用netbeans数据库接口连接到服务器。 （例如在Services / Databases platter下），我也可以使用sequel pro连接mysql服务器。 因此，我怀疑netbeans中的网络配置一定有问题。

我在netbeans IDE中使用代理，但排除了mysql服务器ip。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JavaApplication11 {
    public static void main(String[] args) {
        Connection connection = null;
        try {
            connection = DriverManager
                .getConnection("jdbc:mysql://192.168.56.101:3306/retailer","root", "newpwd");
        } catch (SQLException e) {
            System.out.println("Connection Failed! Check output console");
            e.printStackTrace();
            return;
        }        
        if (connection != null) {
            System.out.println("You made it, take control your database now!");
        } else {
            System.out.println("Failed to make connection!");
        }
        // TODO code application logic here
    }
}

代理配置：

Proxy Settings:
SOCKS Proxy: 127.0.0.1 Port: 10000
No Proxy Hosts: 192.168.56.101

我真的希望有人能帮助我，非常感谢。

堆栈跟踪：

Connection Failed! Check output console
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at JavaApplication11.main(JavaApplication11.java:17)
Caused by: java.net.SocketException: Malformed reply from SOCKS server
    at java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:129)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:503)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:244)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
    ... 15 more

Answer 1

首先-检查类路径中是否包含mysql jdbc驱动程序jar文件

第二-使用Class.forName（“ com.mysql.jdbc.Driver”）在ram中加载驱动程序