页面没反应java.lang.NullPointerException
My JSP 'userinfo.jsp' starting page .title{ width: 30%; background-color: #CCC; font-weight: bold; } .content{ width:70%; background-color: #CBCFE5; } 用户信息
<hr> | 用户名： | | | 密码： | | | 性别： | | | E-mail： | | | 出生日期： | | | 爱好： | | | 自我介绍： | | | 是否介绍协议： | |
package servlet;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import entity.Users;public class RegServlet extends HttpServlet { /** * Constructor of the object. */ public RegServlet() { super(); } /** * Destruction of the servlet.
*/ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet.
* * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * The doPost method of the servlet.
* * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); Users u = new Users(); String username; String mypassword; String gender; String email; String introduce; String isAccept; Date birthday; String[] favorites; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); try { username = request.getParameter("username"); mypassword = request.getParameter("mypassword"); gender = request.getParameter("gender"); email = request.getParameter("email"); introduce = request.getParameter("introduce"); if (request.getParameterValues("isAccept")!=null) { isAccept = request.getParameter("isAccept"); }else { isAccept = "false"; } birthday = sdf.parse(request.getParameter("birthday")); //用来获取多个复选按钮的值 favorites = request.getParameterValues("favorites"); u.setUsername(username); u.setMypassword(mypassword); u.setGender(gender); u.setEmail(email); u.setIntroduce(introduce); if (isAccept.equals("true")) { u.setFlag(true); }else { u.setFlag(false); } u.setBirthday(birthday); u.setFavorites(favorites); //把注册成功的用户对象保存到session中 request.getSession().setAttribute("regUser", u); //跳转到注册成功页面 request.getRequestDispatcher("../userinfo.jsp").forward(request,response); } catch(Exception ex){ ex.printStackTrace(); } } /** * Initialization of the servlet.
* * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here }}package servlet;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import entity.Users;
public class RegServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public RegServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
Users u = new Users();
String username;
String mypassword;
String gender;
String email;
String introduce;
String isAccept;
Date birthday;
String[] favorites;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
username = request.getParameter("username");
mypassword = request.getParameter("mypassword");
gender = request.getParameter("gender");
email = request.getParameter("email");
introduce = request.getParameter("introduce");
if (request.getParameterValues("isAccept")!=null) {
isAccept = request.getParameter("isAccept");
}else {
isAccept = "false";
}
birthday = sdf.parse(request.getParameter("birthday"));
//用来获取多个复选按钮的值
favorites = request.getParameterValues("favorites");
u.setUsername(username);
u.setMypassword(mypassword);
u.setGender(gender);
u.setEmail(email);
u.setIntroduce(introduce);
if (isAccept.equals("true")) {
u.setFlag(true);
}else {
u.setFlag(false);
}
u.setBirthday(birthday);
u.setFavorites(favorites);
//把注册成功的用户对象保存到session中
request.getSession().setAttribute("regUser", u);
//跳转到注册成功页面
request.getRequestDispatcher("../userinfo.jsp").forward(request,response);
} catch(Exception ex){
ex.printStackTrace();
}
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
这样怎么解决空指针？ |
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