登录注册 servlet
package com.hanqi;
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;
/**
* Servlet implementation class RegisterServlet
*/
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegisterServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String password1 = request.getParameter("password1");
String realname = request.getParameter("realname");
System.out.println("姓名:"+realname);
if(checkParam(username,password,password1)){
if(password.equals(password1)){
Object obj = request.getServletContext().getAttribute(username);
if(obj==null){
request.getServletContext().setAttribute(username,username);
response.sendRedirect("massage.jsp?code=1");
}else{
response.sendRedirect("massage.jsp?code=4");
}
}else{
response.sendRedirect("massage.jsp?code=3");
}
}else{
response.sendRedirect("massage.jsp?code=2");
}
}
/**
* @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);
}
public boolean checkParam(String...args){
for(String s:args){
if("".equals(s)||s==null){
return false;
}
}
return true;
}
}
package com.hanqi;
import java.io.IOException;
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;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
ServletContext application = request.getServletContext();
Object obj = application.getAttribute(username);
if(obj!=null) {
String s_username = (String)obj;
if(username.equals(s_username)) {
response.sendRedirect("index.jsp");
} else {
response.sendRedirect("message.jsp?code=5");
}
} else {
response.sendRedirect("message.jsp?code=6");
}
}
/**
* @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);
}
}
<%@ 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>
<form action="LoginServlet" method="post">
username:<input type="text" name="username" />
password:<input type="text" name="password" />
<input type="submit" value="登录" />
</form>
</body>
</html>
<%@ 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">
<meta http-equiv="refresh" content="3;url=index.jsp">
<title>Insert title here</title>
</head>
<body>
<%
String code = request.getParameter("code");
if("1".equals(code)){
out.print("<h1>注册成功!</h1>");
}
if("2".equals(code)){
out.print("<h1>请将信息输入完整 !</h1>");
}
if("3".equals(code)){
out.print("<h1>两次输入的密码不一致 !</h1>");
}if("4".equals(code)){
out.print("<h1>用户名已经存在 !</h1>");
}if("5".equals(code)){
out.print("<h1>用户名不正确 !</h1>");
}
if("6".equals(code)){
out.print("<h1>用户名不存在 !</h1>");
}
%>
</body>
</html>
<%@ 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>
<form action="RegisterServlet" method="post">
username:<input type="text" name="username" /><br>
password:<input type="text" name="password" /><br>
password1:<input type="text" name="password1" /><br>
realname:<input type="text" name="realname" /><br>
<input type="submit" value="提交" />
</form>
</body>
</html>