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 {
@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方式提交表單,然後PassParams接收參數,並處理..
<form name="myForm"method="post" action="myServlet/PassParams">
action這個參數表示
|
URL |
規定當提交表單時，向何處發送表單數據。 |
|
|
· get · post |
規定如何發送表單數據。 |
用post會比較多,不會在url上顯示出表單的數據,而get就會….
<input name="param1" type="text"/>表示
|
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裏要加入:
<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:
