JSP Servlet之 form表單與Servlet之間的參數傳送

最後更新：2018-12-03 來源：互聯網

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JSP Servlet之 form表單與Servlet之間的參數傳送

//index.html<html>    <head>        <title>welcome</title>    </head>    <body>    <form name="myForm" method="post"action="myServlet/PassParams">        <table border="1">        <tr>           <td>param1   </td>           <td><input name="param1"type="text" /></td>               </tr>        <tr>           <td>param2   </td>           <td><input name="param2"type="text" /></td>        </tr>        <tr>           <td>param3  </td>           <td><input name="param3"type="text"/></td>        </tr>        <tr>        <td> </td>            <td><input type="submit"value="mySubmit"/></td>        </tr>        </table>    </form>    </body></html>

然後PassParams這個Servlet的doget / dopost 來處理參數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;}

/////////////////////////////

就是html用post方式提交表單,然後PassParams接收參數,並處理..

action這個參數表示

action

URL

規定當提交表單時，向何處發送表單資料。

method

· get

· post

規定如何發送表單資料。

用post會比較多,不會在url上顯示出表單的資料,而get就會….

<input name="param1" type="text"/>表示

name

field_name

定義 input 元素的名稱。

Servlet中,req.getParameter("param1")這樣就在Servlet中取得了參數param1的值…

Web.xml裡要加入:

<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>

/////////////////////////////////////////////////////////////////////////////

其中<url-pattern>/myServlet/PassParams</url-pattern>

表示訪問這個Servlet的路徑….最終就是:

PassParams的dopost訪問路徑:

http://localhost:8080/PassParams/myServlet/PassParams

例:

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

結果:

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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