reg.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Register</h1>
<hr>
<form name="regForm" action="servlet/RegSevlet" method="post"></form>
<table border = "0" width ="800" cellspacing="0" >
<tr>
<td class = "lable">Name:</td>
<td class = "controler"><input type="text" name="username"></td>
</tr><tr>
<td class = "lable">Password:</td>
<td class = "controler"><input type="password" name="mypassword"></td>
</tr>
<tr>
<td class = "lable">Confirm:</td>
<td class = "controler"><input type="password" name="confirmpass"></td>
</tr>
<tr>
<td class = "lable">Email:</td>
<td class = "controler"><input type="text" name="email"></td>
</tr>
<tr>
<td class = "lable">Gender:</td>
<td class = "controler"><input type="radio" name="gender" checked="checked" value="Male">Male
<input type="radio" name = "gender" checked="checked" value="Female">Female</td>
</tr>
<tr>
<td class = "lable">Hobby:</td>
<td class = "controler"><input type="checkbox" name="favorites" value="nba"> NBA;
<input type="checkbox" name="favorites" value="music">Music;
<input type ="checkbox" name ="favorites" value="movie">Movie;
<input type="checkbox" name="favorites" value="internet">internet;</td>
</tr>
<tr>
<td class = "lable">Introduce:</td>
<td class = "controler"><textarea name="introduce" rows="10" cols="40"></textarea>
</tr>
</table>
<form action="servlet/RegServlet" method="post">
<input type="submit" value="PostTest"/>
</form>
</body>
</html>
-----------------------
userinfo.jsp
<%@ page language="java" import="java.util.*,java.text.*" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>UserInfo</title>
</head>
<body>
<h1>User Info</h1>
<center>
<jsp:useBean id="regUser" class="entity.Users" scope="session"/>
<table cellpadding="0" cellspacing="0" border="1">
<tr>
<td class ="title">Name</td>
<td class ="content"><jsp:getProperty property="username" name="regUser"/></td>
</tr>
<tr>
<td class ="title">Password</td>
<td class ="content"><jsp:getProperty property="mypassowrd" name="regUser"/></td>
</tr>
<tr>
<td class ="title">Gender</td>
<td class ="content"><jsp:getProperty property="gender" name="regUser"/></td>
</tr>
<tr>
<td class ="title">Email</td>
<td class ="content"><jsp:getProperty property="email" name="regUser"/></td>
</tr>
<tr>
<td class ="title">Hobby</td>
<td class ="content"></td>
<%
String[] favorites = regUser.getFavorites();
for(String f:favorites){
%>
<%=f%>
<%
}
%>
</tr>
<tr>
<td class ="title">Introduce</td>
<td class ="content"><jsp:getProperty property="introduce" name="regUser"/></td>
</tr>
</table>
</center>
</body>
</html>
------------------------
RegServlet.java
package servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import entity.Users;
/**
* Servlet implementation class RegServlet
*/
@WebServlet("/RegServlet")
public class RegServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
Users u =new Users();
String username,mypassword,gender,email,introduce,flag;
String[] favorites;
try
{
username= request.getParameter("username");
mypassword= request.getParameter("mypassword");
gender= request.getParameter("gender");
email= request.getParameter("email");
introduce= request.getParameter("introduce");
favorites= request.getParameterValues("favorites");
flag= request.getParameter("flag");
u.setUsername(username);
System.out.println("username");
u.setMypassword(mypassword);
System.out.println("p");
u.setGender(gender);
System.out.println("g");
u.setEmail(email);
System.out.println("e");
u.setFavorites(favorites);
System.out.println("f");
u.setIntroduce(introduce);
System.out.println("in");
request.getSession().setAttribute("regUser", u);
request.getRequestDispatcher("../userinfo.jsp").forward(request, response);
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
------------------------
不知道怎么解决，尝试了好多路径
username
p
g
e
f
in
[err] java.lang.NullPointerException
[err] at servlet.RegServlet.doPost(RegServlet.java:75)
[err] at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
[err] at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
[err] at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1285)
[err] at [internal classes]
[err] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
[err] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
[err] at java.lang.Thread.run(Thread.java:801)
问题解决了，发现是拼写错误。