How can i extract an object from a javascript script in java

Question

I have this code:

ScriptEngine INTERPRETER = new ScriptEngineManager().getEngineByName("js");
obj = INTERPRETER.eval("var obj = {a:1, b:2};");

So, from the java object obj how can i extract the 2 value form the js object?

Mladen Savić · Accepted Answer · 2018-07-13 11:43:23Z

1

You can use something like this:

 ScriptEngine INTERPRETER = new ScriptEngineManager().getEngineByName("js");
 ScriptObjectMirror obj = (ScriptObjectMirror) INTERPRETER.eval("obj = {a:1, b:2};");
 System.out.println(obj.get("b"));

answered Jul 13, 2018 at 11:43

Mladen Savić

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7 Comments

Bonfra Over a year ago

i can't find ScriptObjectMirror class. is it in an external json?

Mladen Savić Over a year ago

Its a class from jdk.nashorn.api.scripting package

Bonfra Over a year ago

ok but eclipse says me that jdk.nashorn.api.scripting.* is empty. do i need to download it from the market place? if yes what should i search?

Bonfra Over a year ago

do i need to install nashorn from the eclipse marketplace?

Mladen Savić Over a year ago

nashorn.jar is part of Java jdk 1.8.0_151

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