Java 如何将提交按钮重定向到另一个servlet_Java_Forms_Servlets

Java 如何将提交按钮重定向到另一个servlet

java forms servlets

Java 如何将提交按钮重定向到另一个servlet,java,forms,servlets,Java,Forms,Servlets,所以我正在为一个web应用程序创建一个注册页面。但是，我无法让submit按钮重定向到确认页面。注册servlet接收用户信息，确认servlet所做的只是显示用户名并打印欢迎用户名这是我的密码：注册servlet 确认servlet 当您想对post方法执行某些操作时，您应该将method=post添加到表单标记中。我建议将[servlet]标记悬停在您的问题下方，直到出现黑色弹出框，然后单击其中的信息链接。 package register.servlet; import java.

所以我正在为一个web应用程序创建一个注册页面。但是，我无法让submit按钮重定向到确认页面。注册servlet接收用户信息，确认servlet所做的只是显示用户名并打印欢迎用户名这是我的密码：注册servlet

确认servlet

当您想对post方法执行某些操作时，您应该将method=post添加到表单标记中。

我建议将[servlet]标记悬停在您的问题下方，直到出现黑色弹出框，然后单击其中的信息链接。

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);
    }

}

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);
    }

}