使用 ScriptEnging 评估 java 中的字符串

Question

下面是我的代码，用于获取一些简单的用户输入 hello 或 mouse 并搜索字符串（稍后我将在更大的文本文件上使用它）。

我用它创建了 Java 行代码，该代码行使用了 contains 方法。之后，我需要对其进行评估。我在使用脚本引擎时找到了一些帮助，但我一直收到此错误：Exception in thread "main" javax.script.ScriptException: ReferenceError: "name" is not defined in <eval> at line number 1 来自我要评估的代码的输出是 name.contains("hello") || name.contains("mouse").

任何帮助都会很棒。谢谢

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


    String searchString = "name";
    String terms = "(hello) || (mouse)";

    String command = "";
    //multiple commands
    if(terms.contains("(") && terms.contains(")") && terms.contains("[") && terms.contains("]")){
        command = terms.replace(")","\")");
        command=command.replace("(", searchString + ".contains(\"");
        command = command.replace("[","(");
        command = command.replace("]",")");
    }
    //only ands/ only ors
    else {
        command = terms.replace("(", searchString + ".contains(\"");
        command = command.replace(")", "\")");
    }


    System.out.println(command);
    String name = "mousehellonamepe";


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

    Object result = engine.eval(command);
    System.out.println(result);

Answer 1

你到底想做什么？

=======更新====== 首先，String terms 应该是一个列表。

成功：

ArrayList<String> searchTerms = new ArrayList();

按如下方式在该列表中添加任意数量的单词：

// using add() to initialize values

    arr.add("Hello");
    arr.add("Mouse");
    arr.add("Bike");
    arr.add("House");

// use contains() to check if the element
        // 2 exits or not
        boolean mouseExists = arr.contains("Mouse");

if (ans)
        System.out.println("Our list contains the word mouse");
    else
        System.out.println("Our list does not contain the word mouse");

这应该输出：

Our list contains the word mouse

代码应如下所示：

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

 ArrayList<String> searchTerms = new ArrayList();

arr.add("Hello");
        arr.add("Mouse");
        arr.add("Bike");
        arr.add("House");
boolean mouseExists = arr.contains("Mouse");

    if (ans)
            System.out.println("Our list contains the word mouse");
        else
            System.out.println("Our list does not contain the word mouse");

}

Answer 2

Interpreter i = new Interpreter();

    i.set("searchThis", searchString);
    i.set("answer", i.eval(command));
    Boolean answer2 = (Boolean) (i.get("answer"));

http://www.beanshell.org/manual/quickstart.html#Calling_BeanShell_From_Your_Application

我用它来评估命令。上面的link提供了所有的解释！

使用 ScriptEnging 评估 java 中的字符串

Evaluating String in java Using ScriptEnging

java

scriptengine