<script type="text/javascript">
$(function() {
$(":input[name=username]").change(function() {
var val = $(this).val();
val = $.trim(val);
if (val != "") {
var url = "${pageContext.request.contextPath}/json";
var person = new Object();
person.name = "Lanny";
person.age = "25";
person.location = "China";
var persons = JSON.stringify(person);
alert(persons);
$.post(url, persons, function(data) {
$("#message").html(data);
});
}
});
})
</script>
</head>
<body>
<form action="" method="post">
用户名:
<input type="text" name="username" />
<div id="message"></div>
<br />
<input type="submit" value="Confirm" />
</form>
后端
String name =request.getParameter("persons").toString();怎么获取的空指针异常了
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request.getAttribute(): 看看
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if (val != "") {
var url = "${pageContext.request.contextPath}/json";
var map = {
name :"Lanny",
age : "25",
rand : Math.random()
}
$.post(url, map , function(data) {
$("#message").html(data);
});
}
后端
String name =request.getParameter("name");
改成 这样 试试
------解决思路----------------------
if (val != "") {
var url = "${pageContext.request.contextPath}/json";
$.post(url, {"name":"Lanny","age":25,"location:"China"}, function(data) {
$("#message").html(data);
});
}
String name =request.getParameter("name");
String age=request.getParameter("age");
String location=request.getParameter("location");
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String name =request.getParameter("name");
String age=request.getParameter("age");
String location=request.getParameter("location");
楼上正解,跟获取表单一样
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简单的发送：
$.ajax({
type:"post",
url:"<%=request.getContextPath() %>/UserServlet",
dataType:'json',
data:{
userName : $('#form1 input[name=userName]').val(),
password : $('#form1 input[name=password]').val(),
email : $('#form1 input[name=email]').val(),
mobile : $('#form1 input[name=mobile]').val(),
birthday : $('#form1 input[name=birthday]').val()
},
success:function(msg){
$('#msg').html("congratulation!");
}, error:function (msg){
$('#msg').html("The server occur an exception!");
}
});
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如何获取：
String username=request.getParameter("userName");
String password=request.getParameter("password");
String email=request.getParameter("email");
String mobile=request.getParameter("mobile");
String birthday=request.getParameter("birthday");
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答案不符合，请指出。