Question

我正在尝试将JSP中的文本框中的参数发送到servlet。出于某种原因，在尝试从servlet获取参数时，我总是得到null。

我的HTML代码是：

<FORM method="POST" action="eimLoggingServlet">
        Execution Id <b><INPUT type="text" name="Execution_Id" size="10"> <INPUT
        type="submit" name="submit" value="Find log">
</FORM>

我的Servlet代码是：

public class EimLoggingServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

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

        try {


            String exeId = request.getParameter("Execution_Id");


        } catch (Exception e) {

        }

    }


}

我的Web.xml：

 <servlet>
    <servlet-name>eimServlet</servlet-name>
    <servlet-class>com.viewlinks.eim.monitoring.servlet.EimLoggingServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>eimServlet</servlet-name>
    <url-pattern>/eimLoggingServlet</url-pattern>
  </servlet-mapping>

exeId始终为空。

Answer 1

我已将'POST'更改为'GET'，显然问题已解决：

JSP：

 <FORM method="GET" action="eimLoggingServlet">
        Execution Id <b><INPUT type="text" name="Execution_Id" size="10"> <INPUT
        type="submit" name="submit" value="Find log">
</FORM>

Servlet：

public class EimLoggingServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

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

        try {


            String exeId = request.getParameter("Execution_Id");


        } catch (Exception e) {

        }

    }


}

Servlet request.getParameter（）总是返回“null”

1 个答案: