用的eclipse3.2 + MyEclipse5.5
java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:334)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:418)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:521)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:325)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.spume.logic.VenditionGather.qryData(VenditionGather.java:75)
at com.spume.logic.VenditionGather.main(VenditionGather.java:131)
Connection conn = null;
//连接字符串格式: "jdbc:数据库驱动名称:连接模式:@数据库服务器ip:端口号:数据库SID"
String url = "jdbc:oracle:thin:@localhost:1521:XXGW";
String username = "green";
String password = "light";
try {
//创建oracle数据库驱动实例
// oracle.jdbc.driver.OracleDriver
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
//获得与数据库的连接
conn = DriverManager.getConnection(url,username,password);
//创建执行语句对象
Statement stmt = conn.createStatement();
//执行sql语句,返回结果集
ResultSet rs = stmt.executeQuery(sql);
用PL/SQL可以登陆ORACLE classes12.jar包也导入工程了 想知道错误在哪?