Parameter Transfer Between Form and Servlet in JSP Servlet

JSP ServletParameter Transfer Between Form and Servlet

 

//index.html

 
Then passparams the Servlet's doget/dopost to handle the parameter param1-3

package myServlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.PrintWriter;public class PassParams extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {PrintWriter out = resp.getWriter();out.write("doGet\r\n");out.write(req.getParameter("param1"));out.write("\r\n");out.write(req.getParameter("param2"));out.write("\r\n");out.write(req.getParameter("param3"));out.write("\r\n");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stubdoGet(req,resp);}/** *  */private static final long serialVersionUID = 1L;}


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That is, HTML submits the form in post mode, and passparams receives and processes the parameters ..
 
<Form name ="Myform"Method ="Post"Action ="Myservlet/passparams">
The parameter action indicates

 

 
  
 
   
 
    
Action
 
    
URL
 
    
Specifies where to send form data when a form is submitted.
 
   
 
   
 
    
Method
 
    
·Get
·Post
 
    
Specifies how to send form data.
 
   
 
  

 
 
There will be a lot of post requests, and no form data will be displayed on the URL, and get will ....
 
<Input name ="Param1"Type ="Text"/> Indicates

 

 
  
 
   
 
    
Name
 
    
Field_name
 
    
Defines the name of the input element.
 
   
 
  

 
 
In servlet, req. getparameter ("param1") obtains the parameter param1 value in servlet...
 
Add the following content to Web. xml:

<servlet>    <servlet-name>PassParams</servlet-name>    <servlet-class>myServlet.PassParams</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>PassParams</servlet-name>    <url-pattern>/myServlet/PassParams</url-pattern>  </servlet-mapping>

//////////////////////////////////////// /////////////////////////////////////
 
<URL-pattern>/myservlet/passparams </url-pattern>
Indicates the path to access this servlet .... Eventually:
Passparams dopost access path: 
HTTP: /localhost: 8080/passparams/myservlet/passparams
 
 
Example:
Http: // localhost: 8080/passparams/index.html
 
Result: