求解？? ex.getMessage()这个异常怎么解决，无法连接到数据库？？
控制台显示打开数据库时出错: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.
java.lang.NullPointerException
at com.util.DBO.executeQuery(DBO.java:73)
at com.bean.SystemBean.getSiteInfo(SystemBean.java:74)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:99)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2012-5-27 11:26:29 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at com.util.DBO.close(DBO.java:56)
at com.bean.SystemBean.getSiteInfo(SystemBean.java:91)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:99)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619) --------------------编程问答-------------------- 你的SQLServer 2000 Driver驱动包 对没 还有就是连接数据库的地址弄错没.
--------------------编程问答-------------------- 很清楚了。DBO.java:73行，有问题。空指针
at com.util.DBO.executeQuery(DBO.java:73)
ＬＺ参照一下，看看有没有写错。
String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver" ;
String dbURL = "jdbc:microsoft:sqlserver://localhost:1433;databaseName=master;user=sa;password=19851005";
Connection dbConn;
--------------------编程问答-------------------- public class DBO {
private Connection conn;
private Statement stmt;
private DataSource ds;
public DBO()
{
}
/**
打开数据库
*/
public void open()
{
try
{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databasename=jspwygl","sa","123");
//conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databasename=sy8009sql","sy8009sql","sy8009sql");
stmt=conn.createStatement();
System.out.println("打开数据库连接");
}
catch (Exception ex)
{
System.err.println("打开数据库时出错: " + ex.getMessage());
}
}
/**
关闭数据库，将连接返还给连接池
*/
public void close()
{
try
{
// connMgr.freeConnection("java", conn);
conn.close();
System.out.println ("释放连接");
}
catch (SQLException ex)
{
System.err.println("返还连接池出错: " + ex.getMessage());
}
}
/**
执行查询
*/
public ResultSet executeQuery(String sql) throws SQLException
{
ResultSet rs = null;
rs = stmt.executeQuery(sql);
System.out.println ("执行查询");
return rs;
}
我检查了没有问题，但是我的数据库是不是一直没有连接上，我不知道都配置什么文件才能连接上数据库？？？
补充：Java , Eclipse
