从JSP页面的表单操作中调用servlet [英] Calling servlet from a JSP page's form action

问题描述

我试图将输入到JSP页面中文本框中的值传递给servlet，该servlet将值存储为变量.但是，当我单击提交"按钮时，找不到servlet.我收到一条错误消息，指出the requested resource is not available

I'm trying to pass a value input to a textbox in a JSP page to a servlet that will store the value as a variable. But when I click the submit button the servlet isn't found. I get an error stating the requested resource is not available

Servlet类:

    //parse input from hello.jsp input box 
    //and assign to fibNum variable


    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub




    }


}

我查看了一些类似的问题:< form action =" /sampleServlet"给我例外，但是改变路径并不会改变结果.

I've looked at some questions like this: <form action="/sampleServlet" giving me exception but changing the path didn't change the outcome.

有人知道如何解决这个调用servlet的问题吗?还是在链接servlet时缺少我一个步骤?

Does anyone know how to fix this problem calling of a servlet? Or is there a step I'm missing in linking up the servlet?

这也是我的项目树的结构:

Also this is the structure of my project tree:

推荐答案

您需要在此处. 因此，在您的web.xml中定义；

You need to create servlet mapping in your web.xml. See here as well. So in your web.xml define;

<servlet>
  <servlet-name>hello</servlet-name>
  <servlet-class><package name>.HelloServlet</servlet-class>
</servlet>

然后为该servlet创建映射(URL模式).

Then create mappings (url patterns) for the servlet.

<servlet-mapping>
  <servlet-name>hello</servlet-name>
  <url-pattern>/say_hello/*</url-pattern>
</servlet-mapping>

现在在您的JSP参考中，像

Now in your JSP refernce the servlet like

 <form action="say_hello" method="get">            
   <b>Fibonacci Sequence Length </b>  <br>
   <input type="text" name="fibNum"size="20px" style="font-size:30pt;height:60px" >
   <input type="submit" value="submit" style="font-size:30pt;height:60px" > <br>  
   Value [1-100]<br>
 </form>  

这篇关于从JSP页面的表单操作中调用servlet的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！