JSP_TOMCAT_MYSQL_ Registration authentication User;

This article originates from: Http://blog.csdn.net/svitter

Resources Download:

GitHub

git clone https://github.com/Svtter/JSP-tomcat-mysql

The servlet is used:

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 "version=" 3.1 ">  <display-name>JSP_servlet_javabean< /display-name><servlet><description> configuration for user login servlet</description><display-name> Loginservlet</display-name><servlet-name>loginservlet</servlet-name><servlet-class> Loginservlet</servlet-class></servlet>  <servlet-mapping><servlet-name>loginservlet </servlet-name><url-pattern>/LoginServlet</url-pattern></servlet-mapping>< welcome-file-list>    <welcome-file>login.html</welcome-file>  </welcome-file-list> </web-app>

Four Java files:

loginservlet.java://for verification:

Import Java.io.*;import Javax.servlet.*;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Bean. Connectionbean;import bean.userbean;/** * @author svitter * */@SuppressWarnings ("Serial") public class Loginservlet Extends HttpServlet {UserBean user = new UserBean (); Connectionbean Connbean = new Connectionbean ();p ublic void DoPost (HttpServletRequest request, HttpServletResponse Response) throws Servletexception, IOException {String checklogin; String username = request.getparameter ("login"); String Password = request.getparameter ("password"); Checklogin = connbean.checkuser (username, password); if ( Checklogin.equals ("Success")) {User.setusername (username); Request.setattribute ("User", user); Getservletconfig (). Getservletcontext (). Getrequestdispatcher ("/loginsuccess.jsp"). Forward (request, response);} else {request.setattribute ("Checklogin", Checklogin), Getservletconfig (). Getservletcontext (). Getrequestdispatcher ("/logincheck.jsp "). Forward (request, response);} public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, ioexception{ String username = request.getparameter ("login"); String Password = request.getparameter ("password"); Connbean.adduser (username, password); Getservletconfig (). Getservletcontext (). Getrequestdispatcher ("/login.html"). Forward (request, response);}}

Bean. getconnection.java://for connecting to database, database configuration file property.conf

Package Bean;import java.io.*;import java.util.properties;import java.sql.*;p ublic class Getconnection {private static Properties P;static{try{p = new properties (); InputStream is = GetConnection.class.getResourceAsStream ("property.conf" );p. Load (IS); Is.close ();} catch (Exception e) {e.printstacktrace ();}} public static string GetProperty (String key) {return P.getproperty (key);} static string driver = Getconnection.getproperty ("driver"); static string url = Getconnection.getproperty ("url");  String name = Getconnection.getproperty ("user"); static string pass = Getconnection.getproperty ("password"); Static{try{class.forname (driver);} catch (ClassNotFoundException e) {e.printstacktrace ();}} public static Connection getconnection () throws SQLException {return drivermanager.getconnection (URL, name, pass);}}

Property.conf:

Driver=com.mysql.jdbc.driverurl=jdbc:mysql://localhost:3306/usersuser=rootpassword=root

Bean. connectionbean.java://for database operations

Package Bean;import java.sql.*;p ublic class Connectionbean {private Connection con;public Connectionbean () {Try{con = Get Connection.getconnection ();} catch (Exception e) {e.printstacktrace ();}} Add information to the database public boolean addUser (string name, string password) {try{preparedstatement pstmt = con.preparestatement (" insert into ur (name, passwd) VALUES (?,?) "); Pstmt.setstring (1, name);p stmt.setstring (2, password);p stmt.execute (); return true;} catch (Exception e) {e.printstacktrace (); return false;}} Public ResultSet GetUser (String name) {try {Statement stm = Con.createstatement (); ResultSet result = Stm.executequery ("select * from ur where name= '" +name+ "'"); return result; catch (Exception e) {e.printstacktrace (); return null;}} public string CheckUser (string name, String passwd) {string Checkuser=null;try{statement stm = Con.createstatement (); ResultSet result = Stm.executequery ("select * from ur where name= '" +name+ "'"); if (Result.next () ==false) {CheckUser = "No US Er ";} Else{if (result.getstring ("passwd"). EqualS (passwd)) {CheckUser = "Success";} Else{checkuser = "wrong passwd";}} catch (Exception e) {e.printstacktrace ();} return checkUser;}}