我是新来的，不是以英语为母语的人:)。因此，我编写了一种表单，该表单通过java servlet中的post方法发送简单值。最初，它与request.getParameter（）一起使用，我不知道自己做了什么，但是它不再起作用了。
package servlets;
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;
//import services.*;
//import org.json.JSONException;
//import org.json.JSONObject;
public class Authentification extends HttpServlet{
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter writer = res.getWriter();
writer.println("<h1>Bienvenue sur notre nouveau site WEB</h1>");
writer.println("<body>");
//Form
writer.println("<form action="+"Authentification"+" method="+"post"+" class="+"form"+">");
//login
writer.println("<div class="+">");
writer.println("<label for="+"login"+">Login:");
writer.println("<input type="+"text"+" name="+"login"+"/>");
writer.println("</label>");
writer.println("</div>");
//password
writer.println("<div class="+">");
writer.println("<label for="+"pwd"+">Password:");
writer.println("<input type="+"text"+" name="+"pwd"+"/>");
writer.println("</label>");
writer.println("</div>");
//button form
writer.println("<div class="+"button"+">");
writer.println("<button type="+"submit"+" name="+"button_connexion"+" value="+"Se_connecter"+">Connexion</button>");
writer.println("</div>");
writer.println("</form>");
//aller sur le lien de l'inscription
writer.println("<a href="+"/ProjetWeb2020/Inscription"+">T'es nouveau?Par ici l'inscription</a>");
writer.println("</body>");
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter writer = res.getWriter();
String login, pwd;
login=req.getParameter("Login");
pwd=req.getParameter("Pwd");
if(login==null && pwd==null){
writer.println("<h1>Not good!</h1>");
}
//JSONObject obj=services.Authentification.loginUtilisateur(login, pwd);
writer.println("<h2>login is:"+login+"</h2>");
writer.println("<h2>pwd is:"+pwd+"</h2>");
}
}
结果我再也不想了。
我将很高兴感激任何答案：）
访问时更改参数名称。login = req.getParameter（“ login”）;pwd = req.getParameter（“ pwd”）;
它将起作用。