Java调用javascript函数
Java中自带库函数中有ScriptEngine可以支持javascript等script文件
ScriptEngineManager manager = new ScriptEngineManager();
//ScriptEngineManager可以理解为一个工厂,根据你输入的语言名字,返回调用的函数库。
ScriptEngine jsEngine = manager.getEngineByName("javascript");
String jsFileName = "sha256.js";
FileReader reader = new FileReader(jsFileName);
//通过eval函数读取Engine实例
jsEngine.eval(reader);
String str = null;
if (jsEngine instanceof Invocable) {
Invocable invoke = (Invocable) jsEngine;
//SHA256是js中的function名字。
str = (String) invoke.invokeFunction("SHA256", toSha);
}
reader.close();
return str;
}
另外在Spring中对该函数进行了封装,如下:
//script type
String scriptType = "javascript";
//script source
String scriptSource = "console.log();";
//argument
Map<String, Object> arguments = new HashMap<>();
argument.put("argument1", "Hello World");
StandardScriptEvaluator evaluator = new StandardScriptEvaluator();
//set script type
evaluator.setLanguage(scriptType);
//execute the script
evaluator.evaluate(new StaticScriptSource(scriptSource), argument);