Question

我刚刚在3天前介绍过JSP，所以我对它还不是很熟悉。

所以我在这里有这个代码：

<body>
        <form method="post">
            <center>
            <table border="1" cellpadding="5" cellspacing="2">
                <thead>
                    <tr>
                        <th colspan="2">Login Here</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>Username</td>
                        <td><input type="text" name="username" required/></td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td><input type="password" name="password" required/></td>
                    </tr>
                    <tr>
                        <td colspan="2" align="center"><input type="submit" value="Login" />
                            &nbsp;&nbsp;
                            <input type="reset" value="Reset" />
                        </td>                        
                    </tr>                    
                </tbody>
            </table>
            </center>
        </form>

注意：此代码是从互联网上借来的。一旦我把它连接到mySQL，我就会改变它。致Lahaul Seth的信用。

所以我想知道如何唤起下面的代码。

String username = request.getParameter("username");
String password = request.getParameter("password");

if(Login.LoginA(username, password).equals("Admin")){
        out.println("Admin");
}else if(Login.LoginA(username, password).equals("Employee")){
        out.println("Employee");
}else{
    out.println("Unidentified User");
}

我想我必须使用html部分中的登录按钮做一些事情，但我不知道如何。希望你们能帮助我。谢谢！

Answer 1

请在表单标记上添加操作属性，如下所示：

<form method="post" action="LoginServlet">
            <center>
            <table border="1" cellpadding="5" cellspacing="2">
                <thead> 
                    <tr>
                        <th colspan="2">Login Here</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>Username</td>
                        <td><input type="text" name="username" required/></td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td><input type="password" name="password" required/></td>
                    </tr>
                    <tr>
                        <td colspan="2" align="center"><input type="submit" value="Login" />
                            &nbsp;&nbsp;
                            <input type="reset" value="Reset" />
                        </td>                        
                    </tr>                    
                </tbody>
            </table>
            </center>
        </form>

创建一个这样的servlet提示，它将根据输入标记的name属性读取用户名和密码，如下所述

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

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

    String user_name =request.getParameter("username");
    String password =request.getParameter("password");
    System.out.println("Username -> "+user_name +" Password --> "+password);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

JSP：唤起java代码

1 个答案: