java.sql.SQLException:IO异常:网络适配器无法建立连接? [英] java.sql.SQLException: IO Exception : The Network adapter could not establish the connection?
问题描述
我正在Windows 7 OS上使用eclipse kepler上的ojdbc14 jar和Java 8与Oracle 11g数据库建立连接.但是,当我运行代码时,出现以下错误.这是我和相应的错误.
Hi I am trying to connect with Oracle 11g database using ojdbc14 jar on eclipse kepler with java 8 on windows 7 os. But when I am running the code I am getting the following error. Here is my and the errors accordingly.
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");
}
}
}
错误如下.
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)
And the Errors are as follows.
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)
推荐答案
通过我们的对话,您可以通过telnet&从命令提示符连接到数据库.经过jdbcurl之后,我发现了错误.
From our conversation, you are able to telnet & connect to database from command prompt. After going through jdbcurl, I have found the error.
localhost:1521/xe 应该为 localhost:1521:xe .
从
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521/xe", "scott", "tiger");
收件人
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe", "scott", "tiger");
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