将json数据从servlet传递到jsp到js文件 [英] passing json data from servlet to jsp to js file
问题描述
我得到了这个创建JSON数据的servlet，我希望将这些数据传递给jsp页面，该页面应该通过InfoVis工具包显示数据。
I got this servlet which creates JSON data and I want to pass this data on to a jsp page which is supposed to display the data via the InfoVis toolkit.
servlet.java
servlet.java
JSONObject json = new JSONObject();
JSONArray toplevel = new JSONArray();
JSONObject sublevel;
try{
json.put("id", "node" + 0);
json.put("name", "name" + 0);
int count = 5;
for(int i=1; i < count; i++){
sublevel = new JSONObject();
sublevel.put("id", "node" + i);
sublevel.put("name", "name" + i);
toplevel.put(sublevel);
}
json.put("children", toplevel);
} catch (JSONException jse) {
}
request.setAttribute("jsonString", json.toString());
RequestDispatcher dispatcher = request.getRequestDispatcher("graph.jsp");
dispatcher.forward(request, response);
以下代码由InfoVis Toolkit提供，我不确定是否可以更改。或者至少我没有足够的经验来改变它。
The following Code is provided by the InfoVis Toolkit and I'm not sure if it can be changed. Or at least I don't have enough experience in JS to change it.
graph.jsp
graph.jsp
<body onload="init('${jsonString}');">
spacetree.js
spacetree.js
function init(jsonString){
var json = jsonString;
最初函数调用只是
<body onload="init()">
但init（）函数的JSON变量是硬编码的，当然这根本没用。所以我正在寻找一种方法来实现这种动态。但是由于字符串中的引用它现在完全混淆了onload = init（）函数调用..
but the init() function has the JSON variable hardcoded, which is of course not useful at all. So I'm looking for a way to make that dynamic. But since theres quotations inside the string it now totally messes up the onload=init() function call..
推荐答案
廉价和简单的方法是修改JSP，使其输出：
The cheap and easy way is to modify the JSP so it outputs this:
<script>
var theData = ${jsonString};
</script>
<body onload="init(theData);">
这样做的缺点是它会创建一个全局变量，但是如果你调用 init 就这样， init 已经是全球性的，所以这艘船已经航行了。 ： - ）
The downside to that is that it creates a global variable, but if you're calling init in that way, init is already a global, so that ship has sailed. :-)
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