连接代码public static Connection getConnection() {
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "bjsxt");
} catch (ClassNotFoundException e) {
e.printStackTrace();
throw new java.lang.RuntimeException(e);
} catch (SQLException e) {
e.printStackTrace();
throw new java.lang.RuntimeException(e);
}
return conn;
}
public static void main(String[] args) {
DB.getConnection();
}
结果发生这样的错误Exception in thread "main" java.lang.NullPointerException
at java.lang.String.<init>(String.java:176)
at oracle.sql.CharacterSet.AL32UTF8ToString(CharacterSet.java:1517)
at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:589)
at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:542)
at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:816)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:362)
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(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.bjsxt.drp.util.DB.getConnection(DB.java:24)
at com.bjsxt.drp.util.DB.main(DB.java:84)
请大家看看是为什么。很奇怪
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "bjsxt");
} catch (ClassNotFoundException e) {
e.printStackTrace();
throw new java.lang.RuntimeException(e);
} catch (SQLException e) {
e.printStackTrace();
throw new java.lang.RuntimeException(e);
}
return conn;
}
public static void main(String[] args) {
DB.getConnection();
}
结果发生这样的错误Exception in thread "main" java.lang.NullPointerException
at java.lang.String.<init>(String.java:176)
at oracle.sql.CharacterSet.AL32UTF8ToString(CharacterSet.java:1517)
at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:589)
at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:542)
at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:816)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:362)
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(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.bjsxt.drp.util.DB.getConnection(DB.java:24)
at com.bjsxt.drp.util.DB.main(DB.java:84)
请大家看看是为什么。很奇怪
CharacterSet dbCharset = CharacterSet.make(oracleId);
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
这是我刚连接ORACLE的时候。你说有问题。哪有问题呢?这这几句代码
int oracleId = CharacterSet.ZHS16GBK_CHARSET;
CharacterSet dbCharset = CharacterSet.make(oracleId);
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:yourdb","mytest","mytest");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM yourtable"); 其中红色部分如果你数据库的编码为GBK,就不需要改,否则改成你数据库对应的编码
不行。还是一样的错误。就是连不上。我的ORACLE用的是默认的。可以在哪查到他的编码吗
还不行就换成现在本机的ip试一下
以前我这样换过解决了问题!