java servlet重新源调度器在正确的位置包含html

9 月 Questions & Answers 1116

我有一个非常基本的登录servlet

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

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

        // get request parameters for userID and password
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        if (username.equals("marti") && password.equals("bosch")) {
            response.sendRedirect("login_success.jsp");
        } else {
            RequestDispatcher rd = getServletContext().getRequestDispatcher(
                    "/login.html");
            PrintWriter out = response.getWriter();
            out.println("<font color=red>Either user name or password is wrong.</font>");
            rd.include(request, response);
        }
    }
}

当我调用servlet时，它将从登录名中删除。html:

<!DOCTYPE html>
<html>
<head>
<title>Login Page</title>
</head>
<body>
    <form action="LoginServlet" method="post">
        <p>Username: <input type="text" name="username"> </p>
        <p>Password: <input type="password" name="password"> </p>
        <p><input type="submit" value="Login"></p>
    </form>
</body>
</html>

如果输入了正确的用户名和密码，浏览器将正确显示登录成功。jsp。但是，如果我没有输入正确的用户名和密码，浏览器会将未渲染的html显示为纯文本：

<font color=red>Either user name or password is wrong.</font>
<!DOCTYPE html>
<html>
<head>
<title>Login Page</title>
</head>
<body>
    <form action="LoginServlet" method="post">
        <p>Username: <input type="text" name="username"> </p>
        <p>Password: <input type="password" name="password"> </p>
         <p><input type="submit" value="Login"></p>
    </form>
</body>
</html>

如何使LoginServlet将消息放在正确的位置（正文标记之后）？谢谢

<!DOCTYPE html> <html> <head> <title>Login Page</title> </head> <body> <font color=red>Either user name or password is wrong.</font> <form action="LoginServlet" method="post"> <p>Username: <input type="text" name="username"> </p> <p>Password: <input type="password" name="password"> </p> <p><input type="submit" value="Login"></p> </form> </body> </html>

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java servlet重新源调度器在正确的位置包含html

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