servlet的简单登录

servlet有2个核心：request和response

通过request传入数据，response响应

1.LoginServlet.java

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
* @Title: com.zrcx.servlet.LoginServlet.java
* @Description: servlet登录
* @Copyright: Copyright (c) 2017
* @Company:
* @author: ***
* @date:
* @version: V1.0
*/
public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
public void init(ServletConfig config) throws ServletException {
System.out.println("初始化....");
}

@Override
public void destroy() {
System.out.println("servlet关闭....");
}

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  String username = request.getParameter("username");
  String password = request.getParameter("password");
  System.out.println("用户名:" + username);
  System.out.println("密码:" + password);
  arg1.setContentType("text/html;charset=UTF-8");
  PrintWriter out = arg1.getWriter();
  out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
  out.println("<HTML>");
  out.println(" <HEAD><TITLE>登录结果页面</TITLE></HEAD>");
  out.println(" <BODY>");
  if ("abc".equals(username) && "123".equals(password)) {
   out.print("<center><h1>用户登录成功</h1></center>");
   //获取会话对象
   HttpSession session = request.getSession();
   session.setAttribute("ticket", "门票");
   System.out.println("会话ID:" + session.getId());
  }else{
   out.print("<center><h1>用户登录失败</h1></center>");
  }
  out.println(" </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
}

}

2.login.html

<!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>登录页面</title>
<style type="text/css">

</style>
</head>
<body>
<form action="LoginServlet" method="get">
<table>
<tr>
<td>用户名:</td>
<td>
<input type="text" name = "username">
</td>
</tr>
<tr>
<td>密  码:</td>
<td>
  <input type="password" name = "password">
</td>
</tr>
<tr>
<td> </td>
<td>
  <input type="submit" value="登录" name ="btn1" />
<input name ="reset" type="reset" value="重置" onclick="resetAll();"/>
   </td>
</tr>
</table>
</form>
</body>
</html>

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