我建了个连接数据库的程序,把从官网上下载的驱动包(sqljdbc4.jar)正确导入了,然后去连接SQL Server数据库,
出现了连接问题,我的链接代码是:
public class GetConnection {
private static final String DRIVER_CLASS = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private static final String URL = "jdbc:sqlserver://localhost:7777;databaseName=restaurant;integratedSecurity=true;"; public static Connection getConnection(){
Connection conn = null;
try{
Class.forName(DRIVER_CLASS);
conn = DriverManager.getConnection(URL);
}catch(SQLException e){
e.printStackTrace();
}catch(ClassNotFoundException ce){
ce.printStackTrace();
}
return conn;
}
}
错误提示是:
com.microsoft.sqlserver.jdbc.SQLServerException: 通过端口 7777 连接到主机 localhost 的 TCP/IP 连接失败。错误:“connect timed out。请验证连接属性,并检查 SQL Server 的实例正在主机上运行,且在此端口接受 TCP/IP 连接,还要确保防火墙没有阻止到此端口的 TCP 连接。”。
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:170)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1049)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:833)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:716)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:841)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:207)
at ConnectionManager.GetConnection.getConnection(GetConnection.java:24)
at ConnectionManager.GetFoodName.getFoodNames(GetFoodName.java:26)
at testconnection.Main.main(Main.java:22)
java.lang.NullPointerException
at ConnectionManager.GetFoodName.getFoodNames(GetFoodName.java:27)
at testconnection.Main.main(Main.java:22)
我之后把防火墙关掉或者把localhost:后面数字改成1433还是出现同样的错误。
出现了连接问题,我的链接代码是:
public class GetConnection {
private static final String DRIVER_CLASS = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private static final String URL = "jdbc:sqlserver://localhost:7777;databaseName=restaurant;integratedSecurity=true;"; public static Connection getConnection(){
Connection conn = null;
try{
Class.forName(DRIVER_CLASS);
conn = DriverManager.getConnection(URL);
}catch(SQLException e){
e.printStackTrace();
}catch(ClassNotFoundException ce){
ce.printStackTrace();
}
return conn;
}
}
错误提示是:
com.microsoft.sqlserver.jdbc.SQLServerException: 通过端口 7777 连接到主机 localhost 的 TCP/IP 连接失败。错误:“connect timed out。请验证连接属性,并检查 SQL Server 的实例正在主机上运行,且在此端口接受 TCP/IP 连接,还要确保防火墙没有阻止到此端口的 TCP 连接。”。
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:170)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1049)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:833)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:716)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:841)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:207)
at ConnectionManager.GetConnection.getConnection(GetConnection.java:24)
at ConnectionManager.GetFoodName.getFoodNames(GetFoodName.java:26)
at testconnection.Main.main(Main.java:22)
java.lang.NullPointerException
at ConnectionManager.GetFoodName.getFoodNames(GetFoodName.java:27)
at testconnection.Main.main(Main.java:22)
我之后把防火墙关掉或者把localhost:后面数字改成1433还是出现同样的错误。
windows authenticate
TCP/IP端口改成7777