如何以HTML形式获取Servlet变量

我试图将一个变量从html form传递到通过脚本的servlet，在servlet中，它将连接到db并获得两个结果变量。

再次，我使用请求调度程序将响应转发回HTML表单，但我一直坚持将变量填充以HTML的形式填充。

<title>Insert title here</title>
<script>
function showCustomer() {
    var kkk = document.getElementById("num").value;
    alert("this is mango1 "+kkk);
    var xmlhttp;
    xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            <!-- what should come here to get "set attributes value " -->
        }
    };
  xmlhttp.open("POST", "callserv1?num="+kkk, true); 
  xmlhttp.send();
}
</script>
</head>
<body>
<form action=""> 
Receipt no <input type="text" name="num" id="num"/>
<input type="button" onclick="showCustomer(num)" value ="call"/>
</form>
<p id="demo">Customer info will be listed here...</p>
</body>
</html>

import static java.lang.System.out;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class callserv1 extends HttpServlet
{
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
    {
        response.setContentType("text/html");   
        PrintWriter out = response.getWriter();
        out.println("This Example demonstrates, using Ajax request to Access Servlet ");
        String grnxx =  request.getParameter("num");
        String pono = null;
        String podt = null;
        out.println("i am in" +grnxx);  
        try
        {                 
        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection con=DriverManager.getConnection("connection db");
        Statement st=con.createStatement();
        System.out.println("Connection estabilished"+con);
        //Input query to get PO and Itemlist for given GRn
        ResultSet rs=st.executeQuery("query");
        while(rs.next()) {
            pono = rs.getString("doc");
            podt = rs.getString("dt"); 
            System.out.println("Pono:----   "+pono);
            System.out.println("Podt:----   "+podt);
        }
        con.close(); 
        System.out.println("DB Connection closed successfully");
        }   catch (Exception e) {
            System.out.println("Connection error: "+e);
        }
        request.setAttribute("pono", pono);
        request.setAttribute("podt", podt);
        request.getRequestDispatcher("index.html").forward(request,response);
    }
}

您可以使用请求转发并将数据从请求中的属性设置为属性，然后在JSP上将数据传递到JSP（不是HTML），然后在JSP中您可以渲染这些数据以生成HTML

在JSP侧您可以使用以下选项之一来获取属性值。

Scriptlets
表达语言

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