About realizing page Jump of website in Servlet

Front end typesetting is ugly , Please forgive me , Mainly to realize the function , If there is a problem , Please give me some advice .

First we need to prepare two html Page file of

The content displayed is

index.html:

findone.html The content of is ：

What we need is to jump from the main page to the query page , Click the query button to complete the page Jump .

Click the back button to return to the main interface

Here we need two servlet Class to complete the corresponding operation

They are query classes ：

package Servlet;

import Dao.MakerMemberImpl.MakerImpl;
import Dao.Makerservier;
import MakerMember.Maker;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class Servletfind extends ViewBaseServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int flag=0;
        request.setCharacterEncoding("UTF-8");
        String idfirst = request.getParameter("id");
        int id=101;
        try {
            id = Integer.parseInt(idfirst);
        } catch (Exception e){
            flag=1;
        }
        if(flag!=1)
        try {
            Makerservier makerservier= null;
            try {
                makerservier = new MakerImpl();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
           Maker maker= makerservier.findmaker(id);
            List<Maker> makerList=new ArrayList<Maker>();
            makerList.add(maker);
            HttpSession session=request.getSession();
            session.setAttribute("makerList",makerList);
            super.processTemplate("findone",request,response);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        else{
            response.sendRedirect("index");

        }
    }
}

And return classes ：

package Servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class Servletreturn extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.sendRedirect("index");// Redirect 
    }
}

And one of me web.xml The document of is ：

 <servlet>
        <servlet-name>Servlet6</servlet-name>
        <servlet-class>Servlet.Servletfind</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet6</servlet-name>
        <url-pattern> /findone</url-pattern><!-- What should be filled in here is form The request sent by the form action The name of -->
    </servlet-mapping>
    <servlet>
        <servlet-name>Servlet7</servlet-name>
        <servlet-class>Servlet.Servletreturn</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet7</servlet-name>
        <url-pattern> /return</url-pattern><!-- What should be filled in here is form The request sent by the form action The name of -->
    </servlet-mapping>

And my front-end html The content is ：

main interface ：

<div id="div_find">
    <form action="find" method="post">
            <h class="b4"> Query member information </h><br/>
             Of the query Id: <input type="text" name="id"/><br/>
            <input class="a2" type="submit" value=" check   Inquiry "/>
        </form>
    </div>

Query result interface ：

<form id="form_find" action="return" method="post">
    <input type="submit" value=" return " class="a2">
  </form>

In this way, you can complete the jump between the two interfaces , The principle of redirection is applied , One web Resource received client A After the request ,B Will inform A The client accesses another web resources C, This process is called redirection .