Question

我试图通过脚本从html调用servlet，获取用户数据（比如收据编号），在servlet中，它连接到db并获取文档no和文档日期。当我查看reponsetext时，我得到了未定义的值。请帮助我以正确的方式获取响应文本。

＆＃13;

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script>
function showCustomer(num) {
	
	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) {          
	          document.getElementById("pono").innerHTML = xmlhttp.responseText;
	          alert(demo);	        
        }
    };
  
  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"/>
<p id="demo">Customer info will be listed here...
PO no <input type="text" name="pono" id="pono"/>
Po date <input type="text" name="podt" id="podt"/></p>
</form>
</body>
</html>

＆＃13;

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();
		
		String grnxx =  request.getParameter("num");
		String pono = null;
		String podt = null;
		System.out.println("I am in Servlet");
		System.out.println("input receipt number received: " +grnxx);
		
		try
		{				  
		Class.forName("oracle.jdbc.driver.OracleDriver");
		Connection con=DriverManager.getConnection("db connection');
		Statement st=con.createStatement();
		System.out.println("Connection estabilished"+con);
	
		//Input query to get PO and Itemlist for given GRn
		ResultSet rs=st.executeQuery("!!!!DB 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");
		
		request.setAttribute("pono", pono);
		request.getRequestDispatcher("index.html").include(request,response);
		

		
		}	catch (Exception e)	{
			System.out.println("Connection error: "+e);
		}
	}
}

＆＃13;

如何从xmlhttpresponse获取servlet变量

0 个答案: