Question

急急急急！！用eclipse向mysql数据库写入时的错误，一点提交就这样，拜托拜托！！空指针怎么改呢？

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
com.tjau.StrawberryLv.servlet.AddSpecialServlet.doPost(AddSpecialServlet.java:46)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.55 logs.

报错的代码：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");

String s_tName = request.getParameter("s_tName").toString().trim();//这是46行报错那里
String s_dName = request.getParameter("s_dName").toString().trim();
String s_place = request.getParameter("s_place").toString().trim();
float s_price = Float.parseFloat(request.getParameter("s_price").toString().trim());
String s_intrude = request.getParameter("s_intrude").toString().trim();

Special special = new Special();
special.setS_tName(s_tName);
special.setS_dName(s_dName);
special.setS_place(s_place);
special.setS_price(s_price);
special.setS_intrude(s_intrude);

ISpecialBiz specialBiz = new SpecialBizImpl();
boolean flag = specialBiz.add(special);

request.setAttribute("msgcode", 200);
RequestDispatcher dispatcher = request.getRequestDispatcher("addSpecial.jsp");
dispatcher.forward(request, response);

}

Answer 1

空指针异常 ， 你也知道是哪一行出错了， 建议你去看看页面上的文本框的属性是不是s_tName。

也就是看看页面是怎么提交数据的。

追问

请问文本框属性在哪个页面看呢？我怎么能看到页面怎么提交数据呢？

追答

。。。。。我也看不到你电脑上的代码， 你要问我哪个页面 我也答不上来， 方便的话留下联系方式可以远程。

追问

那加一下qq帮我看一下吧，谢谢谢谢！！！604402477