Javascript JQuery $.ajax() 在 Java servlet 中发布数据
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JQuery $.ajax() post - data in a java servlet
提问by iJared
I want to send data to a java servlet for processing. The data will have a variable length and be in key/value pairs:
我想将数据发送到 java servlet 进行处理。数据将具有可变长度并以键/值对形式存在：
{ A1984 : 1, A9873 : 5, A1674 : 2, A8724 : 1, A3574 : 3, A1165 : 5 }
The data doesn't need to be formated this way, it is just how I have it now.
数据不需要以这种方式格式化，这正是我现在拥有的方式。
var saveData = $.ajax({
type: "POST",
url: "someaction.do?action=saveData",
data: myDataVar.toString(),
dataType: "text",
success: function(resultData){
alert("Save Complete");
}
});
saveData.error(function() { alert("Something went wrong"); });
The $.ajax()function works fine as I do get an alert for "Save Complete". My dilemna is on the servlet. How do I retrieve the data? I tried to use a HashMap like this...
该$.ajax()功能运行良好，因为我确实收到了“保存完成”的警报。我的困境是在 servlet 上。如何检索数据？我尝试使用这样的 HashMap ......
HashMap hm = new HashMap();
hm.putAll(request.getParameterMap());
...but hmturns out to be null which I am guessing means the .getParameterMap()isn't finding the key/value pairs. Where am I going wrong or what am I missing?
...但hm结果是 null 我猜这意味着.getParameterMap()没有找到键/值对。我哪里出错了或者我错过了什么？
回答by aquinas
You don't want a string, you really want a JS map of key value pairs. E.g., change:
你不想要一个字符串，你真的想要一个键值对的 JS 映射。例如，改变：
data: myDataVar.toString(),
with:
和：
var myKeyVals = { A1984 : 1, A9873 : 5, A1674 : 2, A8724 : 1, A3574 : 3, A1165 : 5 }
var saveData = $.ajax({
type: 'POST',
url: "someaction.do?action=saveData",
data: myKeyVals,
dataType: "text",
success: function(resultData) { alert("Save Complete") }
});
saveData.error(function() { alert("Something went wrong"); });
jQuery understands key value pairs like that, it does NOT understand a big string. It passes it simply as a string.
jQuery 理解这样的键值对，它不理解大字符串。它只是将它作为字符串传递。
UPDATE:Code fixed.
更新：代码已修复。
回答by Harish Verma
Simple method to sending data using java script and ajex call.
使用java脚本和ajax调用发送数据的简单方法。
First right your form like this
首先像这样正确你的表格
<form id="frm_details" method="post" name="frm_details">
<input id="email" name="email" placeholder="Your Email id" type="text" />
<button class="subscribe-box__btn" type="submit">Need Assistance</button>
</form>
javascript logic target on form id #frm_details after sumbit
sumbit 后表单 id #frm_details 上的 javascript 逻辑目标
$(function(){
$("#frm_details").on("submit", function(event) {
event.preventDefault();
var formData = {
'email': $('input[name=email]').val() //for get email
};
console.log(formData);
$.ajax({
url: "/tsmisc/api/subscribe-newsletter",
type: "post",
data: formData,
success: function(d) {
alert(d);
}
});
});
})
General
Request URL:https://test.abc
Request Method:POST
Status Code:200
Remote Address:13.76.33.57:443
From Data
email:[email protected]
回答by iJared
For the time being I am going a different route than I previous stated. I changed the way I am formatting the data to:
目前，我走的路线与我之前所说的不同。我将格式化数据的方式更改为：
&A2168=1&A1837=5&A8472=1&A1987=2
On the server side I am using getParameterNames() to place all the keys into an Enumerator and then iterating over the Enumerator and placing the keys and values into a HashMap. It looks something like this:
在服务器端，我使用 getParameterNames() 将所有键放入 Enumerator，然后遍历 Enumerator 并将键和值放入 HashMap。它看起来像这样：
Enumeration keys = request.getParameterNames();
HashMap map = new HashMap();
String key = null;
while(keys.hasMoreElements()){
key = keys.nextElement().toString();
map.put(key, request.getParameter(key));
}
