java.sql.SQLException: IO 異常：網絡適配器無法建立連接？

Question

您好，我正在嘗試使用 eclipse 開普勒上的 ojdbc14 jar 和 windows 7 操作系統上的 java 8 連接 Oracle 11g 數據庫。 但是當我運行代碼時，出現以下錯誤。 這是我的和相應的錯誤。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Scanner;

    public class JDBCExample {
      public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.println("enter your databse details");
       System.out.println("user name");
       String uName = sc.next();
       System.out.println("password");
       String pWord = sc.next();
       try {
          Class.forName("oracle.jdbc.driver.OracleDriver");
       } catch (ClassNotFoundException e) {
        e.printStackTrace();
       }
       Connection conn = null;
       try {
        conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger");
        // jdbc:oracle:thin:@server:1521:xe
       } catch (SQLException e) {
        e.printStackTrace();
       }
       if (conn != null) {
        System.out.println("Successfully connected to DB");
        } else {
        System.out.println("Failed to connect to DB");
       }
   }
}

錯誤如下。 java.sql.SQLException: Io exception: The Network Adapter could not establish the connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at JDBCExample.main(JDBCExample.java:23)

Answer 1

通過我們的對話，您可以在命令提示符下遠程登錄並連接到數據庫。 經過jdbcurl之后，我發現了錯誤。

如果xe是數據庫的SID，則localhost：1521 / xe應為localhost：1521：xe 。

從更改此代碼

conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521/xe", "scott", "tiger");

至

conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:xe", "scott", "tiger");

看看這篇文章

Answer 2

從services.msc啟動oracle監聽服務

Answer 3

您缺少導入oracle.jdbc.driver.OracleDriver