ScriptEngine如何传递表示JSON的字符串? [英] ScriptEngine how to pass a String that represent JSON?

问题描述

我试图使用jdk 1.6中的ScriptEngine将代表JSON字符串的字符串对象从Java传递到javascript函数.

I was trying to pass a String object that represents a JSON string from java to javascript function using ScriptEngine in jdk 1.6.

我的代码在JSFIDDLE中运行 http://jsfiddle.net/hn4yk/13/我尝试使用无法正常工作的ScriptEngine加载它，并抛出异常sun.org.mozilla.javascript.internal.EcmaError:TypeError:无法从未定义的属性中读取"resultList"(#1164)

My code works in JSFIDDLE http://jsfiddle.net/hn4yk/13/ but when I try to load it with the ScriptEngine it doesn't work and throws an exception sun.org.mozilla.javascript.internal.EcmaError: TypeError: Cannot read property "resultList" from undefined (#1164)

我测试了变量是否正确传递，但是eval或JSON.parse方法不起作用！我试图将JSON.parse库和我的函数放在同一个文件中！

I tested that the variable is passed correctly but the eval or the JSON.parse method doesn't work! I tried to put the library for JSON.parse and my function in the same file!

这是我的Java代码:

This is my java code:

public class InvokeScriptMethod {


    public static void main(String[] args) throws Exception {

        InputStream stream = new FileInputStream("C:/Subclipse/TestJavascriptServerSide/jsonInput.txt");
        StringWriter writer = new StringWriter();
        IOUtils.copy(stream, writer, "UTF-8");
        String jsonString = writer.toString();

        InputStream javascriptStream = new FileInputStream("C:/Subclipse/TestJavascriptServerSide/Script");
        StringWriter writerScript = new StringWriter();
        IOUtils.copy(javascriptStream, writerScript, "UTF-8");
        String javascriptString = writerScript.toString();

        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByExtension("js");

        engine.eval(javascriptString);

        Invocable inv = (Invocable) engine;

        String convertedJson = (String)inv.invokeFunction("convertJSON",jsonString);

        System.out.println("results"+convertedJson);

        // now should I convert it to a writer to reply in a webapplication as response.getWriter().print(convertedJson);
        // and I would like to don't lose the JSON formatting to see data with indentation
    }
}

感谢您的帮助！谢谢！

推荐答案

问题出在jsonInput文件上，我不得不将所有Json Stream放在一行中并且可以正常工作！

The problem was on the jsonInput file I had to put all Json Stream in a single line and it works!

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