java.sql.SQLException：Io 异常：端口号的数字格式无效

Question

package jdbcconnection;

import java.sql.*;

public class Jdbc2{

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

        //Resgister the driver through 

         Class.forName("oracle.jdbc.driver.OracleDriver");
         System.out.println("registered driver successfully");
         //Create the connection and assign to connection reference
         Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:CUSTDB", "scott", "tiger");
         System.out.println("connection successsfully");
         //create a statement through connection reference and assign to statement reference
         Statement stmt=con.createStatement();
         System.out.println("statement object created successfully");
         //call the executequery method through statement reference and pass the query as argument.
         ResultSet rs=stmt.executeQuery("select * from emp");

         System.out.println("query is executed");

         while(rs.next()){
             int i=rs.getInt(1);
             String str=rs.getString(2);
             String str1=rs.getString(3);
             int i1=rs.getInt(4);
             System.out.println(i+"\t"+str+"\t"+str1+"\t"+i1);    
         }
    }
}

错误--

Exception in thread "main" java.sql.SQLException: Io exception: Invalid number format for port number
    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:439)
    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 jdbcconnection.Jdbc2.main(Jdbc2.java:13)

Answer 1

我注意到使用/ 指定 SID 而不是服务名称不起作用。所以以下是不正确的：

jdbc:oracle:thin:@my.host.com:1521/DB_SID

它会抛出listener doesn't know of service ... 错误。使用 SID 时，应使用冒号而不是斜杠。

而且这个会抱怨端口号格式无效

jdbc:oracle:thin://@my.host.com:1521:DB_SID    

您注意到@ 符号前的双斜线了吗？只需删除它们，一切都会好起来的。

Answer 2

您的网址不正确。

应该是

getConnection("jdbc:oracle:thin:@localhost:portnum:CUSTDB", "scott", "tiger");

例子：

"jdbc:oracle:thin:@localhost:1521:xe", "scott", "tiger"

其中 xe 是数据库名称。

希望这会有所帮助。

Answer 3

它在堆栈跟踪中：“端口号的数字格式无效” 你应该输入一个有效的端口号而不是CUSTDB

Answer 4

while(rs.next()){
             int i=rs.getInt(1);
             String str=rs.getString(2);
             String str1=rs.getString(3);
             int i1=rs.getInt(4);
             System.out.println(i+"\t"+str+"\t"+str1+"\t"+i1);

这也是错误的！您需要使用字段名称来获取值，而不是 1、2、3 等数字。是的，请检查您的端口号以解决端口异常！ 查看有关 JDBC 的演示：http://www.tutorialspoint.com/jdbc/jdbc-sample-code.htm

是的，请提供更多有关您的工作的信息并提出适当的问题，而不是仅仅发布错误堆栈！