SERvet的表单

首先要建立好数据库。

好了，先写好两个静态页面，分别负责登录和注册。

代码清单1：login.jsp（登录页面）

<%--

    Document   : login

    Created on : 2013-8-29, 17:14:30

    Author     : Barudisshu

--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>

        <title>登录</title>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    </head>

    <body>

        <div>

            <form action="login.do" method="post">

                <table>

                    <tr>

                        <td><label for="user">用户名：</label></td>

                        <td><input type="text" id="user" name="user" value=""></td>

                    </tr>

                    <tr>

                        <td><label for="password">密码：</label></td>

                        <td><input type="password" id="password" name="password" value=""></td>

                    </tr>

                    <tr>

                        <td colspan="2"><input type="submit" name="submit" value="登录"></td>

                    </tr>

                </table>

            </form>

        </div>

    </body>

</html>

代码清单2：register.jsp （注册页面）

<%--

    Document   : register

    Created on : 2013-8-29, 17:14:50

    Author     : Barudisshu

--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

        <title>注册</title>

    </head>

    <body>

        <div>

            <form action="register.do" method="post">

                <table>

                    <tr>

                        <td><label for="user">用户名：</label></td>

                        <td><input type="text" id="user" name="user" value=""></td>

                    </tr>

                    <tr>

                        <td><label for="password">密码：</label></td>

                        <td><input type="password" id="password" name="password" value=""></td>

                    </tr>

                    <tr>

                        <td><label for="resure">确认密码：</label></td>

                        <td><input type="password" id="resure" name="resure" value=""></td>

                    </tr>

                    <tr>

                        <td><label for="email">邮箱地址：</label></td>

                        <td><input type="email" id="password" name="email" value=""></td>

                    </tr>

                    <tr>

                        <td colspan="2"><input type="submit" name="submit" value="注册"></td>

                    </tr>

                </table>

            </form>

        </div>

    </body>

</html>

建立数据库模型，主要实现数据库连接建立、执行查询、释放连接、判断等操作。

代码清单3：DataProvider.java （数据模型）

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author Barudisshu
*/
public class DataProvider {
//指定驱动名
protected static String driver = "com.mysql.jdbc.Driver";
//指定访问的URL
protected static String url = "jdbc:mysql://localhost:3306/gossip";
//MySQL用户名
protected static String user = "root";
//MySQL密码
protected static String password = "***";
//初始Connection
protected static Connection connection = null;
//建立连接
public static Connection getConnection() {
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, user, password);
return connection;
} catch (ClassNotFoundException | SQLException e) {
return null;
}
}
//获取结果集
public static ResultSet getResultSet(String sql) {
Statement statement;
ResultSet resultSet = null;
Connection conn = getConnection();
if (conn != null) {
System.out.println("连接成功！");
try {
statement = conn.createStatement();
resultSet = statement.executeQuery(sql);
} catch (Exception e) {
}
return resultSet;
} else {
return null;
}
}
//判断结果集是否为空
public static boolean isResultSetNull(String sql) {
int count = 0;
ResultSet resultSet = getResultSet(sql);
try {
while (resultSet.next()) {
count += 1;
}
} catch (SQLException ex) {
Logger.getLogger(DataProvider.class.getName()).log(Level.SEVERE, null, ex);
}
if (count == 0) {
return true;
} else {
return false;
}
}
//是否执行
public static boolean execute(String sql) {
boolean success;
Statement statement;
Connection conn = getConnection();
if (conn != null) {
try {
statement = conn.createStatement();
success = statement.execute(sql);
} catch (Exception e) {
success = false;
}
} else {
success = false;
}
return success;
}
//释放连接
public static void releaseConnection() {
try {
if (connection != null) {
connection.close();
}
} catch (Exception e) {
}
}
}

创建注册验证Servlet，将取得请求参数、验证请求参数，业务跳转。逻辑业务部分。

代码清单4：Register.java （注册）

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.individuals.mysql.data.DataProvider;
/**
*
* @author Barudisshu
*/
public class RegisterServlet extends HttpServlet {
private final String SUCCESS_VIEW = "success.view";
private final String ERROR_VIEW = "error.view";
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("utf-8");
//获取请求参数
String email = request.getParameter("email");
String user = request.getParameter("user");
String password = request.getParameter("password");
String confirmedPasswd = request.getParameter("resure");
List<String> errors = new ArrayList<>();
if (isInvalidEmail(email)) {
errors.add("未填写邮件或邮件格式不正确");
}
if (isInvalidUsername(user)) {
errors.add("用户名为空或已存在");
}
if (isInvalidPassword(password, confirmedPasswd)) {
errors.add("请确认密码符合格式并再次确认密码");
}
String resultPage = ERROR_VIEW;
if (!errors.isEmpty()) {
request.setAttribute("errors", errors);
} else {
resultPage = SUCCESS_VIEW;
createUserData(email, user, password);
}
request.getRequestDispatcher(resultPage).forward(request, response);
}
//判断邮箱输入格式是否正确
private boolean isInvalidEmail(String email) {
return email == null || !email.matches("^[_a-z0-9-]+([.]"
+ "[_a-z0-9-]+)*@[a-z0-9-]+([.][a-z0-9-]+)*$");
}
//判断是否存在该用户
private boolean isInvalidUsername(String username) {
return !DataProvider.isResultSetNull("select * from gossip.userinfo where username = '" + username + "'");
}
//判断密码是否有效
private boolean isInvalidPassword(String password, String confirmedPasswd) {
return password == null
|| password.length() < 6
|| password.length() > 16
|| !password.equals(confirmedPasswd);
}
//创建用户资料并写入数据库
private void createUserData(String email, String username, String password) {
DataProvider.execute("insert into gossip.userinfo(email,username,password)"
+ " values ('" + email + "','" + username + "','" + password + "')");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}

下面分别建立注册成功与失败的视图。

代码清单5：Error.java （注册失败）

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 *

 * @author Barudisshu

 */

public class Error extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();

        try {

            /* TODO output your page here. You may use following sample code. */

            out.println("<!DOCTYPE html>");

            out.println("<html>");

            out.println("<head>");

            out.println("<meta charset=\"utf-8\">");

            out.println("<title>新增会员失败</title>");

            out.println("</head>");

            out.println("<body>");

            out.println("<h1>新增会员失败</h1>");

            out.println("<ul style='color:red;'>");

            List<String> errors = (List<String>) request.getAttribute("errors");

            for (String error : errors) {

                out.println("<li>" + error + "</li>");

            }

            out.println("</ul>");

            out.println("<a href='register.html'>返回注册页面</a>");

            out.println("</body>");

            out.println("</html>");

        } finally {

            out.close();

        }

    }

    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        processRequest(request, response);

    }

    @Override

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        processRequest(request, response);

    }

}

代码清单6：Success.java （注册成功）

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;
/**
*
* @author Barudisshu
*/
public class Success extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<meta charset=\"utf-8\">");
out.println("<title>新增会员成功</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>会员" + request.getParameter("user") + "注册成功</h1>");
out.println("<a href=\"login.jsp\">回首页登录");
out.println("</body>");
out.println("</html>");
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}

注册成功后就可以登录了，登录需要进行相关验证操作。

代码清单7：Login.java （验证用户登录）

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.individuals.mysql.data.DataProvider;
/**
*
* @author Barudisshu
*/
public class LoginServlet extends HttpServlet {
private final String SUCCESS_VIEW = "member.view";
private final String ERROR_VIEW = "login.jsp";
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("utf-8");
String user = request.getParameter("user");
String password = request.getParameter("password");
if(checkLogin(user, password)){
request.getRequestDispatcher(SUCCESS_VIEW).forward(request, response);
}else{
response.sendRedirect(ERROR_VIEW);
}
}
//读取数据库，验证登录
private boolean checkLogin(String username, String password) {
if (username != null && password != null) {
return !DataProvider.isResultSetNull("select * from gossip.userinfo "
+ "where username = '" + username + "' and password = '" + password + "'");
}
return false;
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}

验证失败，则从新登录，通过sendRedirect()跳转到登录页面；验证成功，则进行下一步操作。

代码清单8：Member.java （登录成功）

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;
/**
*
* @author Barudisshu
*/
public class Member extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<meta charset=\"utf-8\">");
out.println("<title>会员登录成功页面</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>会员 " + request.getParameter("user") + " 你好</h1>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}

代码清单9：web.xml （标准依赖部署文件）

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

    <servlet>

        <servlet-name>LoginServlet</servlet-name>

        <servlet-class>net.individuals.web.servlet.LoginServlet</servlet-class>

    </servlet>

    <servlet>

        <servlet-name>RegisterServlet</servlet-name>

        <servlet-class>net.individuals.web.servlet.RegisterServlet</servlet-class>

    </servlet>

    <servlet>

        <servlet-name>Error</servlet-name>

        <servlet-class>net.individuals.web.servlet.Error</servlet-class>

    </servlet>

    <servlet>

        <servlet-name>Success</servlet-name>

        <servlet-class>net.individuals.web.servlet.Success</servlet-class>

    </servlet>

    <servlet>

        <servlet-name>Member</servlet-name>

        <servlet-class>net.individuals.web.servlet.Member</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>LoginServlet</servlet-name>

        <url-pattern>/login.do</url-pattern>

    </servlet-mapping>

    <servlet-mapping>

        <servlet-name>RegisterServlet</servlet-name>

        <url-pattern>/register.do</url-pattern>

    </servlet-mapping>

    <servlet-mapping>

        <servlet-name>Error</servlet-name>

        <url-pattern>/error.view</url-pattern>

    </servlet-mapping>

    <servlet-mapping>

        <servlet-name>Success</servlet-name>

        <url-pattern>/success.view</url-pattern>

    </servlet-mapping>

    <servlet-mapping>

        <servlet-name>Member</servlet-name>

        <url-pattern>/member.view</url-pattern>

    </servlet-mapping>

    <session-config>

        <session-timeout>

            30

        </session-timeout>

    </session-config>

</web-app>

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