JSP可以采用什么值来形成“动作"?拿?

问题描述

JSP表单动作可以是什么?我有一个Login.jsp页面供用户结束详细信息.我可以在表单操作中给servlet类吗?

What can a JSP form action be?I have a Login.jsp page for the user to end the details.Can i give the servlet class in the form action?

这是servlet代码.

here is the the servlet code.

package mybean;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginServlet() {
    super();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try
    {
        System.out.println("In the Login Servlet");
        LoginBean user = new LoginBean();
        user.setUemail(request.getParameter("uemail"));
        user.setUpass(request.getParameter("upass"));
        user = LoginDAO.login(user);
        if(user.isValid())
        {
            HttpSession session = request.getSession(true);
            session.setAttribute("currentSessionUser",user);
            response.sendRedirect("LoginSuccess.jsp");
        }else
            response.sendRedirect("LoginFailed.jsp");
    } catch (Throwable exc)
    {
        System.out.println(exc);
    }
}

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

}

推荐答案

根据规范，它可以采用任何有效的 URI

As per the specs , it can take any valid URI

我可以采取动作的形式提供servlet类吗?

是的，如果Servlet类名称解析为web.xml中映射的有效URL，否则您将遇到 404 .

Yes if the servlet class name resolves to a valid URL mapped in the web.xml or else you will encounter a 404 .

让我们考虑您的JSP位于应用程序的根目录，然后

Let us consider your JSP is at the root of the application, then

<FORM action="someServletName" method="post">

现在这将解析为protocol://servername:port/context/someServletName.现在应该在 web.xml 中或通过 annotation 将/someServletName映射到Servlet.或JSP.

Now this will be resolved as protocol://servername:port/context/someServletName .Now somewhere you should have a mapping for /someServletName , either in web.xml or through annotation to a Servlet or JSP.

<servlet>
     <servlet-name>someServletName</servlet-name>
     <servlet-path>packageName.servletName</servlet-path>
</servlet>
<servlet-mapping>
     <servlet-name>someServletName</servlet-name>
     <url-pattern>/someServletName</url-pattern>
</servlet-mapping>

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