重装Tomcat之后的问题
因为某些原因重装了Tomcat,但之后就一直出现问题,数据库老是连接不上~!
以下是个登录的模块出现的问题:
org.apache.jasper.JasperException: Exception in JSP: /page/index2.jsp:12
9: if(request.getParameter("username")!=null&&request.getParameter("password")!=null){
10: String sql="select username from member where username='"+request.getParameter("username")+"'and password='"+request.getParameter("password")+"'";
11: connDB conn=new connDB();
12: ResultSet rs=conn.executeQuery(sql);
13: if(rs.next()){
14: String username=new String(request.getParameter("username").toString().getBytes("ISO-8859-1"),"GB2312");
15: session.setAttribute("username",username);
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
起 因
java.lang.NullPointerException
javabean.connDB.executeQuery(connDB.java:50)
org.apache.jsp.page.index2_jsp._jspService(index2_jsp.java:55)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
之前用过数据库连接类,连接类是没问题的~!现在是不知道问题在哪?