无法连接到 Oracle 10g XE答案

【问题标题】：Unable to connect to Oracle 10g XE无法连接到 Oracle 10g XE
【发布时间】：2015-02-26 23:11:38
【问题描述】：

我的代码：

package java_connect;

import java.sql.*;

public class JdbcOracleXe {

    public static void main(String[] args) {
        System.out.println("-------- Oracle JDBC Connection Testing ------");

        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
        } catch (ClassNotFoundException e) {
            System.out.println("Where is your Oracle JDBC Driver?");
            e.printStackTrace();
            return;
        }

        System.out.println("Oracle JDBC Driver Registered!");

        Connection connection = null;

        try {
            connection = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521/xe", "username",
                "password");
        } 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!");
        }
    }
}

错误信息：

-------- Oracle JDBC Connection Testing ------
Oracle JDBC Driver Registered!
Connection Failed! Check output console
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(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at java_connect.JdbcOracleXe.main(JdbcOracleXe.java:28)

【问题讨论】：

那么，您是否有一个 Oracle 数据库在您自己的机器上运行并监听 1521 端口？好像没有。
请您添加堆栈跟踪的其余部分，理想情况下，我们能够确认连接是否在主机 localhost 上寻找端口 1521。

标签： java oracle jdbc database-connection sqlexception

【解决方案1】：

检查您是否已启动数据库。似乎数据库可能已关闭，因此您无法连接

【讨论】：