所以我正在制作一个web应用程序的注册页面。然而，我无法获得提交按钮重定向到确认页面。注册servlet接收用户信息，所有确认servlet所做的只是显示用户名并打印出"欢迎(用户名)"
下面是我的代码:
注册servlet
package register.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Register")
public class Register extends HttpServlet {
private static final long serialVersionUID = 1L;
public Register() {
super();
}
public void init() throws ServletException {
ArrayList<HW1User> HW1Users = new ArrayList<HW1User>();
getServletContext().setAttribute("HW1Users", HW1Users);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String docType = "<!doctype html public "-//w3c//dtd html 4.0 transitional//en">n";
out.println(docType);
out.println("<html>" + "<head>" + "<meta charset="UTF-8">" + "<title>Register</title>"
+ "<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">"
+ "</head>" + "<body>" + "<div class="container">" + "<div class="jumbotron">"
+ "<h1>Welcome to Bat!</h1>"
+ "<p>Bat! is a cloud-based note taking app that allows you to create, store, edit, and share notes that you create directly in your browser!</p>"
+ "<p>To begin, register below.</p>" + "</div>"
+ "<div class="panel panel-primary">" + "<div class="panel-heading">"
+ "<h3 class="panel-title"> New User Registration</h3>"
+ "</div>" + "<div class="panel-body">" + "<form>" + "<div class="form-group">"
+ "<label for="name">Full Name</label>"
+ "<input type="name" class="form-control" name="fullName" id="fullName" placeholder="First and Last Name">"
+ "</div>"
+ "<div class="form-group">" + "<label for="email">Email Address</label>"
+ "<input type="email" class="form-control" name="email" id="email" placeholder="Email">"
+ "</div>" + "<div class="form-group">" + "<label for="password1">Password</label>"
+ "<input type="password" class="form-control" name="password1" id="password1" placeholder="Password">"
+ "</div>" + "<div class="form-group">" + "<label for="password2">Re-Enter Password</label>"
+ "<input type="password" class="form-control" name="password2" id="password2" placeholder="Re-Enter Your Password">"
+ "</div>"
+ "<button type="submit" value ="Post" class="btn btn-primary">Register</button>" + "</form>"
+ "</div>" + "</div> <!-- End Well -->" + "</div>" + "</body>" + "</html>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
int id = Integer.parseInt(request.getParameter("id"));
ArrayList<HW1User> HW1Users = (ArrayList<HW1User>) getServletContext().getAttribute("HW1Users");
for (HW1User entry : HW1Users)
if (entry.getId() == id){
entry.fullName = request.getParameter("fullName");
entry.email = request.getParameter("email");
entry.password1 = request.getParameter("password1");
entry.password2 = request.getParameter("password2");
break;
}
ServletContext context = getServletContext();
RequestDispatcher rd = context.getRequestDispatcher("/Confirm");
rd.forward(request, response);
doGet(request, response);
}
}
确认servlet
package register.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Confirm")
public class Confirm extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HW1User entry = null;
try{
int id = Integer.parseInt(request.getParameter("id"));
ArrayList<HW1User> HW1Users = (ArrayList<HW1User>) getServletContext().getAttribute("HW1Users");
for (HW1User e : HW1Users){
if (e.getId() == id){
entry = e;
break;
}
}
}catch(Exception e){}
finally{
if (entry == null){
response.sendRedirect("Register");
return;
}
}
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println(" <meta charset="UTF-8">");
out.println(" <title>Cervantes, Albert - cs320stu100</title>");
out.println(" <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">");
out.println("</head>");
out.println("<body>");
out.println("<div class="container">");
out.println("Welcome " + entry.getName() + " !!");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
当你想在post方法上做一些动作时，你应该把method="post"添加到你的form标签中。