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" οnclick="resetAll();"/> </td> </tr> </table> </form> </body> </html>
