JSP Servlet之 form表单 与Servlet之间的参数传送

JSP Servlet之 form表单 与Servlet之间的参数传送

 

//index.html

    
        
    
    
    

        

        

           
param1   
           
       
        
        

           
param2   
           

        
        

           
param3  
           

        
        

        
 
            

        
        
    
    

 

 

然后PassParams这个Servlet的doget / dopost 来处理参数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 {

	@Override
	protected 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");
		
	}

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

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

}

/

 

就是html用post方式提交表单,然后PassParams接收参数,并处理..

 

"myForm"method="post" action="myServlet/PassParams">

action这个参数表示

action	URL	规定当提交表单时，向何处发送表单数据。
method	·         get ·         post	规定如何发送表单数据。

 

用post会比较多,不会在url上显示出表单的数据,而get就会….

 

"param1" type="text"/>表示

name

field_name

定义 input 元素的名称。

 

Servlet中,req.getParameter("param1")这样就在Servlet中取得了参数param1的值…

 

Web.xml里要加入:

    PassParams
    myServlet.PassParams
  
  
    PassParams
    /myServlet/PassParams
  

/

 

其中/myServlet/PassParams

表示访问这个Servlet的路径….最终就是:

PassParams的dopost访问路径: http://localhost:8080/PassParams/myServlet/PassParams

 

 

例:

http://localhost:8080/PassParams/index.html

 

结果: