UC知道jsp空指针
来源：百度知道 编辑：UC知道 时间：2024/06/25 19:53:18
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
request.setCharacterEncoding("gbk");
int result = 0;
String uname = request.getParameter("txtUser");
String upass = request.getParameter("txtPass");
UserInfoBiz userBiz = null;
UserInfo user = userBiz.getUserInfo(uname, upass);
if (user.getUserId() == 0) {
result = userBiz.addUserInfo(uname, upass);//这行报错，空指针
if (result > 0)
response.sendRedirect("success.jsp");
} else
response.sendRedirect("Error.jsp");
}
throws ServletException, IOException {
response.setContentType("text/html");
request.setCharacterEncoding("gbk");
int result = 0;
String uname = request.getParameter("txtUser");
String upass = request.getParameter("txtPass");
UserInfoBiz userBiz = null;
UserInfo user = userBiz.getUserInfo(uname, upass);
if (user.getUserId() == 0) {
result = userBiz.addUserInfo(uname, upass);//这行报错，空指针
if (result > 0)
response.sendRedirect("success.jsp");
} else
response.sendRedirect("Error.jsp");
}
UserInfoBiz userBiz = null;
你让它为空，它敢不空？
断点跟下看看 uname 是不是没有获得内容，这行报错报空
你要看
String uname = request.getParameter("txtUser");
String upass = request.getParameter("txtPass");
有没有内容啊
空值 是
String uname = request.getParameter("txtUser");
String upass = request.getParameter("txtPass");
产生的， 第一 核对前台 text 文本 的属性name是不是txtUser、txtPass；
第二 你在操作的时候 这两个文本是否写了参数
UserInfoBiz userBiz = null;
UserInfo user = userBiz.getUserInfo(uname, upass);//上边为null,这里调用当然报错。。