运行时java代码（字符串）注入和执行

Question

我正在尝试注入现有代码并执行一串附加的java代码，这些代码使用我的项目中定义的类并操作我的“编译”代码中提供的数据。 我尝试过使用 beanshell，但在使用现有类时遇到了一些问题（除了使用 lambda 函数、钻石运算符等问题）。 我知道这根本不安全，但我将其用于测试目的。 这就是我的代码现在的样子：

DiscoverViewModel viewModel = new ViewModelProvider(viewModelStoreOwner).get(DiscoverViewModel.class);

        try {
            ArrayList<EntityConsumedThings> things = new ArrayList<>();
            viewModel.getAllThingsLiveData().observe((LifecycleOwner) context,
                    things::addAll);

            Map<String, ConsumedThing> consumedThingMap = new HashMap<>();
            for (EntityConsumedThings t : things) {
                ConsumedThing consumedThing = WotInteraction.getInstance(context).getWot().consume(Thing.fromJson(t.thingJSON));
                consumedThingMap.put(consumedThing.getId(), consumedThing);
            }
        } catch (WotException | JSONException ex){
            ex.printStackTrace();
        }

        // EXAMPLE CODE - IT WILL BE AUTOGENERATED AND RETRIEVED FROM A SERVER
        String code = "ConsumedThing consumedThing = consumedThingsMap.get(\"urn:uuid:92e5b68f-322a-433a-8cff-f50f6ca1b519\");" +
                        "if(consumedThing!=null){" +
                            "ConsumedThingProperty property = consumedThing.getProperty(\"resources\");" +
                            "property.read();\n" +
                        "} else {\n" +
            "               System.out.println(\"RUNTIME ERROR: Thing not found.\");\n" +
                "        }\n;";

        // EXECUTE THE CODE HERE

ConsumedThing、ConsumedThingProperty 类在我的项目中定义。 有没有办法做我想做的事情或者这是不可能的？ 预先感谢任何人都会回答我。

Answer 1

我只需在 beanshell 脚本中导入我需要的类，并将代码中实例化的变量传递到 beanshell 上下文。

DiscoverViewModel viewModel = new ViewModelProvider(viewModelStoreOwner).get(DiscoverViewModel.class);

        // EXAMPLE CODE - IT WILL BE AUTOGENERATED AND RETRIEVED FROM A SERVER
        String code = "import com.example.wot_servient.wot.thing.ConsumedThing;\n"+
                "import com.example.wot_servient.wot.thing.action.ConsumedThingAction;\n" +
                "import com.example.wot_servient.wot.thing.property.ConsumedThingProperty;\n" +
                "ConsumedThing consumedThing = consumedThingsMap.get(\"urn:uuid:92e5b68f-322a-433a-8cff-f50f6ca1b519\");" +
                "if(consumedThing!=null){" +
                "ConsumedThingProperty property = consumedThing.getProperty(\"resources\");" +
                "property.read();\n" +
                "} else {\n" +
                "               System.out.println(\"RUNTIME ERROR: Thing not found.\");\n" +
                "        }\n;";
        // EXECUTE THE CODE HERE

        Executors.newSingleThreadExecutor().execute(() -> {
            try {
                List<EntityConsumedThings> things = viewModel.getAllThingsList();

                Map<String, ConsumedThing> consumedThingsMap = new HashMap<>();
                for (EntityConsumedThings t : things) {
                    ConsumedThing consumedThing = WotInteraction.getInstance(context).getWot().consume(Thing.fromJson(t.thingJSON));
                    consumedThingsMap.put(consumedThing.getId(), consumedThing);
                }
                Interpreter interpreter = new Interpreter();
                interpreter.set("consumedThingsMap", consumedThingsMap);
                interpreter.eval(code);
            } catch (WotException | JSONException | EvalError ex){
                ex.printStackTrace();
            }
        });