用servlet校驗密碼2

時間 2019-11-19

原文原文鏈接

s數據庫：html

正確登陸：java

錯誤登陸：sql

servlet類數據庫

package servlet_chack;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

@WebServlet("/UserCheck")
public class UserCheck extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public UserCheck() {
        super();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");

        String strUserName = null;
        String strPassword = null;

        strUserName = request.getParameter("name");
        strPassword = request.getParameter("password");

        if (check(strUserName, strPassword)) {
            response.getWriter().write("用戶名：" + strUserName);
            response.getWriter().write("</br>");
            response.getWriter().write("密碼：" + strPassword);
        } else {
            response.getWriter().write("用戶名或密碼錯誤！");
        }
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

    public static boolean check(String usr, String psd) {
        final String driver = "org.mariadb.jdbc.Driver";
        final String url = "jdbc:mariadb://192.168.1.231:3306/hello";
        final String user = "root";
        final String pswd = "admin";

        Connection conn;

        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        try {
            conn = DriverManager.getConnection(url, user, pswd);
            Statement stat = conn.createStatement();
            ResultSet rs = stat.executeQuery("select * from users where usr=\"" + usr + "\" and psd=\"" + psd + "\";");
            conn.close();
            return rs.next() ? true : false;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
}

UserCheck

登陸頁面：ide

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用戶名檢查</title>
</head>
<body>
    <h1>用戶登陸</h1>
    <form action="/servlet_chack/UserCheck" method="post">
        <p>
            用戶名：<input type="text" name="name" />
        </p>
        <p>
            密碼：<input type="password" name="password" />
        </p>
        <input type="submit" value="登陸" />
    </form>
</body>
</html>

小結：參考了網上的代碼，在原來的servlet類中新建了check（）方法，在doGet（）中進行了傳參和判斷。post

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