<! DOCTYPE HTML Public"-//w3c//dtd HTML 4.01 transitional//en">"keywords"Content="Keyword1,keyword2,keyword3"> <meta http-equiv="Description"Content="This is my page"> <meta http-equiv="Content-type"Content="text/html; Charset=utf-8"> <!--<link rel="stylesheet"Type="Text/css"href="./styles.css">--> This isMy HTML page. <br> <form method="Get"action=" First">UserName:<input type="text"Name="UserName"/><br/>Password:<input type="text"Name="Password"/><br/> <input type="Submit"Value="Login"/> </form> </body>Package J2ee0525;import java.io.ioexception;import java.io.printwriter;import javax.servlet.ServletException; Import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.HttpServletResponse; Public classFirstserve extends HttpServlet {/** * The Doget method of the servlet. <br> * * This method was called when a form have its tag value me Thod equals to get. * * @param request the request send by the client to the server * @param response the response send by the server To the client * @throws servletexception If a error occurred * @throws IOException If an error occurred */ Public voiddoget (httpservletrequest request, httpservletresponse response) throws Servletexception, IOException { //Receiving user DataString Username=request.getparameter ("UserName"); String Password=request.getparameter ("Password"); Response.setcontenttype ("Text/html;charset=utf-8"); PrintWriter out=Response.getwriter (); out. println ("<! DOCTYPE HTML public \ "-//W3C//DTD HTML 4.01 transitional//en\" >"); out. println ("<HTML>"); out. println (""); out. println ("<BODY>"); out. println ("</BODY>"); //the data can be verified here.//pretending to have a databaseChectdao dao=NewChectdao (); if(Dao.check (userName, password)) { out. println ("Landing Success"); }Else{ out. println ("user name or password is wrong, please re-login"); } out. println ("</HTML>"); out. Flush (); out. Close (); } /** * The DoPost method of the servlet. <br> * * This method was called when a form have its tag value m Ethod equals to post. * * @param request the request send by the client to the server * @param response the response send by the server To the client * @throws servletexception If a error occurred * @throws IOException If an error occurred */ Public voidDoPost (httpservletrequest request, httpservletresponse response) throws Servletexception, IOException { Response.setcontenttype ("text/html"); PrintWriter out=Response.getwriter (); out. println ("<! DOCTYPE HTML public \ "-//W3C//DTD HTML 4.01 transitional//en\" >"); out. println ("<HTML>"); out. println (""); out. println ("<BODY>"); out. Print (" This is"); out. Print ( This. GetClass ()); out. println (", using the POST method"); out. println ("</BODY>"); out. println ("</HTML>"); out. Flush (); out. Close (); }}Package j2ee0525; Public classChectdao { Publicboolean check (String name,string password) {if(Name.equals ("Admin") && Password.equals ("123456")){ return true; }Else{ return false; } } }The first Java EE program
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