HTML将表单中的数据传值给servlet，以及servlet之间传值

html传值给servlet，servlet传给servlet

不知云涌

2046人浏览 · 2022-09-26 10:14:07

不知云涌 · 2022-09-26 10:14:07 发布

首先创建一个html文件，form表单中action为servlet的url值，由于定义文件名为a，所以我在这里的action="a",input里面定义两个类型，一个文本框，一个提交按钮，然后再将文本框里面数据定义name，方便传值。

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="a" >
<input type="text" name="data">
<input type="submit">
</form>
</body>
</html>

然后创建一个servlet文件：

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class a
*/
@WebServlet("/a")
public class a extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public a() {
super();
// TODO Auto-generated constructor stub
}

   /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       request.setCharacterEncoding("utf-8");
       response.setContentType("text/html;charset=UTF-8");
       int a=Integer.parseInt(request.getParameter("data")); //获得html表单中的数据，定义int型
       request.setAttribute("data", a);//传值调用
       for(int i=2;i<a;i++) {
       if(a%i==0) {
       break;
       }
       if(a%i!=0&&i==a-1) {
       request.setAttribute("shuju", i);
       }
       }//确认a是否为素数

       request.getRequestDispatcher("servlet111").forward(request, response);

}

   /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       doGet(request, response);
   }

}

再创建一个servlet：

/**
* Servlet implementation class servlet111
*/
@WebServlet("/servlet111")
public class servlet111 extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public servlet111() {
super();
// TODO Auto-generated constructor stub
}

   /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       request.setCharacterEncoding("utf-8");
       response.setContentType("text/html;charset=UTF-8");
       if(request.getAttribute("shuju")==null) {//获得数据
       response.getWriter().println(request.getAttribute("data")+"不是素数"+"</br>");
       }
       else {
       response.getWriter().println(request.getAttribute("data")+"是素数"+"</br>");
       }

}

在servlet的传值中，运用了两个，其中传值的是request.setAttribute("****",***)
接受的是request.getAttribute("****")