实践Java8之Nashorn Javascript Engine

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Nashorn是一个新的JavaScript引擎（Java6引入过一个JavaScript引擎Rhino），性能更好，对ECMAScript标准有极强的兼容性。

命令行运行nashorn

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$ jjs
jjs> 'Hello, World!'.length
12
jjs>

Java中运行nashorn

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ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("nashorn");
// 执行js
Object result = engine.eval("'Hello, World!'.length");
System.out.println(result);
// 执行外部js
result = engine.eval(Files.newBufferedReader(Paths.get("hello.js")));
System.out.println(result);