Question

我想使用XAMPP在本地网络（三台计算机之间）中将MySQL与Java连接起来。但是我无法使用Java做到这一点，并尝试将数据库与PHP应用程序连接，然后再连接。我认为这不是XAMPP错误。它可能在Java应用程序中。请帮我。

Connection getcon() throws Exception {

    Class.forName("com.mysql.jdbc.Driver");
    String URL = "jdbc:mysql://192.168.8.101/checker";
    String username = "root";
    String password = "";
    //Connection
    con = DriverManager.getConnection(URL, username, password);
    return con;
}

此处有更多详细信息：

例外：

run:

com.mysql.jdbc.CommunicationsException：由于基础异常导致通信链接失败：

**开始嵌套例外**

java.net.SocketException 消息：java.net.ConnectException：连接超时：connect

堆栈跟踪：

java.net.SocketException：java.net.ConnectException：连接超时：connect 在com.mysql.jdbc.StandardSocketFactory.connect（StandardSocketFactory.java:156）在com.mysql.jdbc.MysqlIO。（MysqlIO.java:276）在com.mysql.jdbc.Connection.createNewIO（Connection.java:2666）在com.mysql.jdbc.Connection处（Connection.java:1531）在com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:266）在java.sql.DriverManager.getConnection（DriverManager.java:661）在java.sql.DriverManager.getConnection（DriverManager.java:247）在connectionchecker.JDBC.getcon（JDBC.java:45）在connectionchecker.JDBC.getdata（JDBC.java:68）在connectionchecker.Check.incremntno（Check.java:28）在connectionchecker.Check.jButton1ActionPerformed（Check.java:84）在connectionchecker.Check.access $ 000（Check.java:15）在connectionchecker.Check $ 1.actionPerformed（Check.java:50）在javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java:2022）在javax.swing.AbstractButton $ Handler.actionPerformed（AbstractButton.java:2346）在javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:402）在javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java:259）在javax.swing.plaf.basic.BasicButtonListener.mouseReleased（BasicButtonListener.java:252）在java.awt.Component.processMouseEvent（Component.java:6522）在javax.swing.JComponent.processMouseEvent（JComponent.java:3322）在java.awt.Component.processEvent（Component.java:6287）在java.awt.Container.processEvent（Container.java:2229）在java.awt.Component.dispatchEventImpl（Component.java:4878）在java.awt.Container.dispatchEventImpl（Container.java:2287）在java.awt.Component.dispatchEvent（Component.java:4700）在java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4872）在java.awt.LightweightDispatcher.processMouseEvent（Container.java:4528）在java.awt.LightweightDispatcher.dispatchEvent（Container.java:4457）在java.awt.Container.dispatchEventImpl（Container.java:2273）在java.awt.Window.dispatchEventImpl（Window.java:2724）在java.awt.Component.dispatchEvent（Component.java:4700）在java.awt.EventQueue.dispatchEventImpl（EventQueue.java:743）在java.awt.EventQueue.access $ 400（EventQueue.java:97）在java.awt.EventQueue $ 3.run（EventQueue.java:694）在java.awt.EventQueue $ 3.run（EventQueue.java:691）在java.security.AccessController.doPrivileged（本机方法）在java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75）在java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:86）在java.awt.EventQueue $ 4.run（EventQueue.java:716）在java.awt.EventQueue $ 4.run（EventQueue.java:714）在java.security.AccessController.doPrivileged（本机方法）在java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75）在java.awt.EventQueue.dispatchEvent（EventQueue.java:713）在java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:220）在java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:135）在java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:123）在java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:119）在java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:111）在java.awt.EventDispatchThread.run（EventDispatchThread.java:97）

**结束嵌套例外**

发送到服务器的最后一个数据包是在43毫秒前。我的味精没问题 java.lang.NullPointerException

JDBC类

公共类JDBC {

private static JDBC j;
Connection con = null;

private JDBC() {

}

public static JDBC getJDBC() {
    if(j == null){
        j= new JDBC();
    }
    return j;
}

  Connection getcon() throws Exception {

      try {
           Class.forName("com.mysql.jdbc.Driver");
    //String URL = "jdbc:mysql://127.0.0.1/checker";
    String URL = "jdbc:mysql://192.168.8.101:80/checker";
    String username = "root";
    String password = "";
    //Connection
    con = DriverManager.getConnection(URL, username, password);

      } catch (ClassNotFoundException | SQLException e) {
          System.out.println(e);
      }

  return con;
}

void setdata(String sql) {
    try {
         if (con == null) {
            getcon();
        }
        con.createStatement().executeUpdate(sql);

    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }
}

ResultSet getdata(String sql) throws Exception {
    if (con == null) {
        getcon();
        System.out.println("my msg is conn ok");
    }else{
        System.out.println("my msg is conn not ok");
    }
    ResultSet rset = con.createStatement().executeQuery(sql);
    return rset;
}

}

Answer 1

您需要在IP地址之后传递XAMPP的端口号。

XAMPP的默认端口号是80。

String URL = "jdbc:mysql://192.168.8.101:80/checker";

或者在下面试试这个

String URL = "jdbc:mysql://192.168.8.101:8080/checker";

Answer 2

问题就在这里

System.out.println(data.toString()); //Datos que llegan

注意，这应该代表您的数据库服务器和运行数据库的端口。上面的网址是错误的，因为端口String URL = "jdbc:mysql://192.168.8.101:80/checker";是Apache服务器的默认端口号。但是，您需要使用mysql端口，即3306（默认）。

相反，您应该尝试

我假设String URL = "jdbc:mysql://192.168.8.101:3306/checker";是数据库名称。

为什么无法使用XAMPP

2 个答案: