Servlet-注册页面

环境准备：

本文所用到环境如下：

软件：Eclipse(2018)

服务器：Tomcat 9

在index.jsp添加相关的代码

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body><h1>用户注册</h1>
<div><form action="RegisterServlet" method="get"><table><tr><td>登录名：</td> <td><input type="text" name="username" required> (可包含a-z、0-9和下划线)</td></br><tr><td>密码：</td> <td><input type="password" name="password" required> (至少包含6个字符)</td></tr><tr><td>再次输入密码：</td> <td><input type="password" name="confirmPassword" required></td></tr><tr><td>电子邮箱：</td> <td><input type="text" id="email" name="youxaing" required> (必须包含@字符)</td></tr><tr><td>性别：</td> <td><input type="radio" name="gender" value="男" required>男<input type="radio" name="gender" value="女" required>女</td></tr><td>头像：</td> <td><input type="file" name="bfile" value="选择文件" accept="image/*" ></td></tr><td>爱好：</td> <td><p><input type="checkbox" name="hobby" value="运动"> 运动<input type="checkbox" name="hobby" value="聊天" > 聊天<input type="checkbox" name="hobby" value="玩游戏" > 玩游戏</p></td></tr></tr><td>喜欢的城市：</td> <td><select name="selectList"><option>[请选择]</option><option>北海</option><option>海南</option><option>重庆</option><option>杭州</option><option>深圳</option><option>成都</option></select></tr>    </table><div><p><input type="submit" value="提交"><input type="reset" value="重置"></p></div></form>
</div></body>
</html>

效果为：

Login_Servlet.java代码

package onlyxiu_ceshi.com;import java.io.IOException;
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 javax.servlet.http.HttpSession;/*** Servlet implementation class Login_Servlet*/
@WebServlet("/Login_Servlet")
public class Login_Servlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public Login_Servlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub
//      response.getWriter().append("Served at: ").append(request.getContextPath());request.setCharacterEncoding("UTF-8");//处理乱码问题response.setCharacterEncoding("UTF-8");//处理乱码问题//获得用户在register界面提交的数据String username = request.getParameter("username");String password = request.getParameter("password");String confirmPassword = request.getParameter("confirmPassword");String gender = request.getParameter("gender");String youxaing = request.getParameter("youxaing");String bfile = request.getParameter("bfile");String hobby  = request.getParameter("hobby");String selectList = request.getParameter("selectList");//判断密码是否正确if (password.equals(confirmPassword)){//如果密码相同，重定向到成功界面HttpSession session = request.getSession();//获取sessionsession.setAttribute("session_username",username);session.setAttribute("session_password",password);session.setAttribute("session_gender",gender);session.setAttribute("session_youxaing",youxaing);session.setAttribute("session_bfile",bfile);session.setAttribute("session_hobby", hobby);session.setAttribute("session_selectList",selectList);request.getRequestDispatcher("SuccessServlet").forward(request, response);//  response.sendRedirect("register_login.jsp");//重定向到成功页面}else {//如果密码不同，通知用户密码输入不一样request.getSession().setAttribute("passwordError","yes");request.getRequestDispatcher("ErrorServlet").forward(request, response);
//              response.sendRedirect("register.jsp");//重定向到登陆界面}}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"><display-name>onlyxiu_ceshi</display-name><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list><servlet><servlet-name>Login_Servlet</servlet-name><servlet-class>onlyxiu_ceshi.com</servlet-class></servlet><servlet-mapping><servlet-name>Login_Servlet</servlet-name><url-pattern>/onlyxiu_ceshi/Login_Servlet</url-pattern>// /项目名/类名</servlet-mapping></web-app>

ErrorServlet.java的代码

package onlyxiu_ceshi.com;import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;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 javax.servlet.http.HttpSession;/*** Servlet implementation class ErrorServlet*/
@WebServlet("/ErrorServlet")
public class ErrorServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public ErrorServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub
//      response.getWriter().append("Served at: ").append(request.getContextPath());response.setHeader("Content-type","text/html; charset=UTF-8");String username = request.getParameter("username");String password = request.getParameter("password");String gender = request.getParameter("gender");String youxaing = request.getParameter("youxaing");String bfile = request.getParameter("bfile");String hobby = request.getParameter("hobby");String selectList = request.getParameter("selectList");PrintWriter out = response.getWriter();out.print("<h1>用户注册信息</h1>");out.print("用户名:\n"+username+"<br>");out.print("密码:"+password+"<br>");out.print("电子邮箱："+youxaing+"<br>");out.print("性别:"+gender+"<br>");out.print("头像："+bfile+"<br>");out.print("爱好："+hobby+"<br>");out.print("喜欢的城市："+selectList+"<br>");
//      out.print("登陆失败");out.close();}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub
//      doGet(request, response);}}

SuccessServlet.java

package onlyxiu_ceshi.com;import java.io.IOException;
import java.io.PrintWriter;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 javax.servlet.http.HttpSession;/*** Servlet implementation class SuccessServlet*/
@WebServlet("/SuccessServlet")
public class SuccessServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public SuccessServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub
//      response.getWriter().append("Served at: ").append(request.getContextPath());response.setHeader("Content-type","text/html; charset=UTF-8");String username = request.getParameter("username");String password = request.getParameter("password");String gender = request.getParameter("gender");String youxaing = request.getParameter("youxaing");String bfile = request.getParameter("bfile");String hobby = request.getParameter("hobby");String selectList = request.getParameter("selectList");PrintWriter out = response.getWriter();out.print("<h1>用户注册信息</h1>");out.print("用户名:\n"+username+"<br>");out.print("密码:"+password+"<br>");out.print("电子邮箱："+youxaing+"<br>");out.print("性别:"+gender+"<br>");out.print("头像："+bfile+"<br>");out.print("爱好："+hobby+"<br>");out.print("喜欢的城市："+selectList+"<br>");
//      out.println("登陆成功");out.close();}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub
//      doGet(request, response);}}

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