将JSON数据从JavaScript传递到Java

Question

I'm trying to pass json data from javascript to java, like below. The idea is to pass the data to the java code as a javascript object (and not aa string which I know can be done ). I've tried the code below without success - idea was to use NativeJson.stringify to convert from a javascript object to a Java string, however this results in an Undefined instance instead of the expected string. Any idea on this could be achieved much appreciated.

in javascript file "test.js"

parser.fct ( {"abc":123,"def":456} )

in java

//1.binds javascript calls to Java
...
ScriptEngine engine = new ScriptEngine...
Bindings bindings = engine.createBindings();
bindings.put("parser", new Parser());
engine.eval("test.js");

//2. in Parser class
public void fct(Object obj){
   Context ctx = Context.enter();
   ScriptableObject scope = ctx.initStandardObjects();
   Object json = NativeJSON.stringify(ctx, scope, obj, null,null);

   //json returned is of type Undefined

}

Answer 1

Could not find a way to use NativeJSON.stringify(). I ended up building the json string "by hand", ie Iterating on the property ids of the native javascript object and adding these properties to a java Map.

The Map is then transformed into a json object using new JSONObject(map);

link to source code https://gist.github.com/eleco/c2bc77dca9ecc844a924