请求调度程序转发方法不工作在servlet上的post方法

Question

请求调度程序中的转发方法在Servlet中的doGet（）方法中创建时工作正常。但在dopost方法中使用时不起作用。同样在Jsp文件中，我已经将方法声明为doPost。以下是我在servlet中的代码。

@WebServlet(name = "SignUpServlet") 
public class SignUpServlet extends HttpServlet { 
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 


    ApplicationContext ctx = new ClassPathXmlApplicationContext("lk/ruh/uniAssist/spring/SpringXMLConfig.xml"); 
    SignUPService signUpservice = (SignUPService) ctx.getBean("signUpservice"); 


    String username = request.getParameter("username"); 
    String studentName = request.getParameter("studentName"); 
    String regNo = request.getParameter("regNo"); 
    String pwd = request.getParameter("pwd"); 
    String department = request.getParameter("department"); 
    String semester = request.getParameter("semester"); 

    System.out.println(username); 
    System.out.println(studentName); 
    System.out.println(regNo); 
    System.out.println(pwd); 
    System.out.println(department); 
    System.out.println(semester); 

    RequestDispatcher requestDispatcher = request.getRequestDispatcher("signup.jsp"); 

    requestDispatcher.include(request, response); 




} 

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




} 

}

这正是在doPost方法的方式。以上格式时没有任何反应。但是当我在doGet方法中声明RequestDispatcher方法时，它工作正常。这背后的原因是什么？

<div class="login-bottom"> 
    <h2>Register</h2> 
    <form name="signUpForm" id="signup" method="post" action="/signUp"> 
    <div class="col-md-6"> 
     <div class="login-mail"> 
      <input type="text" name="username" placeholder="Username" required=""> 
      <i class="fa fa-user"></i> 
     </div> 
     <div class="login-mail"> 
      <input type="text" name="studentName" placeholder="Name with initials" required=""> 
      <i class="fa fa-male"></i> 
     </div> 
     <div class="login-mail"> 
      <input type="text" name="regNo" placeholder="RegNo (ex:2528)" required=""> 
      <i class="fa fa-pencil"></i> 
     </div> 
     <div class="login-mail"> 
      <input type="password" name="pwd" placeholder="Password" required=""> 
      <i class="fa fa-lock"></i> 
     </div> 
     <div class="login-mail" placeholder="Department"> 
      Department 
      <select name="department" id="depSelector" class="form-control1"> 
       <option>Civil and Environment Eng.</option> 
       <option>Electrical and Information Eng.</option> 
       <option>Mechanical and Manufacturing Eng.</option> 
      </select> 
     </div> 
     <div class="login-mail" placeholder="Department"> 
      Semester 
      <select name="semester" id="semSelector" class="form-control1"> 
       <option value="1">1 Semester</option> 
       <option value="2">2 Semester</option> 
       <option value="3">3 Semester</option> 
       <option value="4">4 Semester</option> 
       <option value="5">5 Semester</option> 
       <option value="6">6 Semester</option> 
       <option value="7">7 Semester</option> 
       <option value="8">8 Semester</option> 
      </select> 
     </div> 
    </div> 
    <div class="col-md-6 login-do" align="center"> 
     <img src="images/icon.png" style="height: 200px; width: 200px;"> 
     <label class="hvr-shutter-in-horizontal login-sub"> 
      <input type="submit" value="Submit"> 
     </label> 
     <p>Already register</p> 
     <a href="signin.jsp" class="hvr-shutter-in-horizontal">Login</a> 
    </div> 
    <div class="clearfix"></div> 
    </form> 
</div> 

这里是有关JSP代码。

我的整个网站的XML代码

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
    version="3.1"> 

<!--servlet declaration--> 
<servlet> 

    <servlet-name>TimeTableServlet</servlet-name> 
    <servlet-class>lk.ruh.uniAssist.servlet.TimeTableServlet</servlet-class> 
</servlet> 

<servlet> 
    <servlet-name>coursesServlet</servlet-name> 
    <servlet-class>lk.ruh.uniAssist.servlet.coursesServlet</servlet-class> 
</servlet> 

<servlet> 
    <servlet-name>SignInServlet</servlet-name> 
    <servlet-class>lk.ruh.uniAssist.servlet.SignInServlet</servlet-class> 
</servlet> 

<servlet> 
    <servlet-name>SignUpServlet</servlet-name> 
    <servlet-class>lk.ruh.uniAssist.servlet.SignUpServlet</servlet-class> 
</servlet> 


<!--Servlet Mapping--> 

<servlet-mapping> 
    <servlet-name>TimeTableServlet</servlet-name> 
    <url-pattern>/timeTable</url-pattern> 
</servlet-mapping> 

<servlet-mapping> 
    <servlet-name>coursesServlet</servlet-name> 
    <url-pattern>/courses</url-pattern> 
</servlet-mapping> 


<servlet-mapping> 
    <servlet-name>SignInServlet</servlet-name> 
    <url-pattern>/signIn</url-pattern> 
</servlet-mapping> 

<servlet-mapping> 
    <servlet-name>SignUpServlet</servlet-name> 
    <url-pattern>/signUp</url-pattern> 
</servlet-mapping> 

PS：当signup.jsp在URL中使用它工作正常。但不适用于映射的URL /注册。这是我想解决的问题

Answer 1

请确保在form tag method = post和您的servlet类中，覆盖方法doPost（HttpServletRequest req，HttpServletResponse resp）。

默认的表单标签方法是get和你的servlet类需要重写方法doGet（HttpServletRequest req，HttpServletResponse resp）。

如果您不匹配，您将得到R.E- HTTP方法GET不受此URL支持（即-HTTP状态405错误） P.S-完整文件。