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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> <h2>用户注册</h2> <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session
session.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 stub
doGet(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> </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("<h2>用户注册信息</h2>");
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("<h2>用户注册信息</h2>");
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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