数据库连接错误The Network Adapter could not establish the connection

连接数据库报错

java.sql.SQLException: The Network Adapter could not establish the connection

用sqlplus 连接数据库可以连上

java连接时报错。

解决办法：

把admin目录下的listener.ora和tnsnames.ora文件中的HOST全部改为：HOST = 127.0.0.1

import
java.sql.*;

public class JDBCTest {

public static void main(String[] args) throws Exception{

Class.forName("oracle.jdbc.driver.OracleDriver");

Connection conn = DriverManager.getConnection(

"jdbc:oracle:thin:@127.0.0.1:1521:orcl", "scott", "×××");

}

}