<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript">
//--Function to get the xmlhttp object
function getHttpObject(){
var xmlhttp = null;
if (window.XMLHttpRequest){xmlhttp=new XMLHttpRequest();}
else if (window.ActiveXObject){xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}
else {alert("Your browser does not support XMLHTTP!");}
return xmlhttp;
}
function callMultiply(){
xmlhttp = getHttpObject();
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState==4){
f1.result.value = (xmlhttp.responseText);
}
}
var a = parseInt(document.getElementById("a").value);
var b = parseInt(document.getElementById("b").value);
// var resul= (parseInt(a)*parseInt(b));
// alert(parseInt(a)*parseInt(b));
xmlhttp.open("POST","Multi?a=" + a + "&b=" + b, true);
xmlhttp.send();
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form name="f1">
A= <input name="a" id="a" value=""><br />
B= <input name="b" id="b" value=""><br/>
Result= <input id="result" onclick="callMultiply();" >
</form>
</body>
</html>
在输入两个值 A 和 B 时，值被传递给 servlet，从那里返回两个数字的乘积。但我无法将响应转换为整数值。我得到了产品的相应 ASCII 字符。servlet 程序如下。
package com;
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 Multi
*/
@WebServlet("/Multi")
public class Multi extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Multi() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/xml");
int a=0,b=0;
if(request.getParameter("a") != null && request.getParameter("b") != null)
{
a = Integer.parseInt(request.getParameter("a"));
b = Integer.parseInt(request.getParameter("b"));
}
int result = (a*b);
response.getWriter().write(result);
}
}