我正在尝试将数据从JSP文件发送到Java Servlet.我在这里看到了很多有关如何执行此操作的示例，并且我相信我的方法是正确的，但是由于某些原因，未在我的servlet中调用doPost()方法.
I am trying to send data from a JSP file to a Java Servlet. I've seen so many examples on here on how to do it, and I believe I am doing it the right way, but for some reason the doPost() methods is not being called inside my servlet.
这是我添加到我的web.xml文件中的内容:
Here is what I added to my web.xml file:
<?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns="java.sun/xml/ns/javaee" xmlns:xsi="www.w3/2001/XMLSchema-instance" xsi:schemaLocation="java.sun/xml/ns/javaee java.sun/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <servlet> <servlet-name>loginServlet</servlet-name> <servlet-class>src.action.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>loginServlet</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> </web-app>这是我的JSP文件
<html> <head> </head> <body> <form action = "localhost:8080/UserModule/src/action/login" method="post"> Username<input type = "text" name = "username"><br><br> Password<input type = "password" name = "password"><br><br> <input type = "submit" value = "Submit"> </form> </body> </html>这是我的Java servlet:
Here is my Java servlet:
package action; 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; /** * Servlet implementation class LoginServlet */ @WebServlet("/login") public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; public LoginServlet() { super(); // TODO Auto-generated constructor stub } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String username = (request.getAttribute("username")).toString(); System.out.println("asd"); String password = (String) request.getAttribute("password"); System.out.println(username); } }在import javax.servlet.annotation.WebServlet;和@WebServlet("/login")
这是因为它们仅在规范v3.0中实现，而我只被允许使用规范v2.5(在工作中必需). 有谁知道如何解决这个问题?
It's because they were only implemented in the spec v3.0, while I am only allowed to use spec v2.5 (required to at work). Anyone has any idea how to solve this issue?
我的目录:
推荐答案
我可以在您的帖子中看到多个错误，
I could see multiple errors in your post ,
将动作属性替换为，
Replace the action attribute with ,
<form action = "./login" method="post">
如果您使用的是2.5版，请删除导入的注释以及这一行，
If your using the version 2.5 , remove the import for annotation and also this line,
@WebServlet("/login")
第三，要访问servlet中的<form>元素，请使用 request#getParameter
Thirdly, to access the <form> elements in the servlet , use request#getParameter
String username = request.getParameter("username"));
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将发布数据从JSP发送到Java Servlet
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