2018년 4월 25일 수요일

[Java] JavaScript Interface


Download: J2V8

- j2v8_linux_x86_64. (V4.8.0)
- j2v8_win32_x86_64 (V4.6.0)
- j2v8_win32_x86 (V4.6.0)
- j2v8_macosx_x86_64 (V4.6.0)
- j2v8_android (V3.0.5)


1. Execute simple expression

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import com.eclipsesource.v8.V8;

public class Expression {
    public static void main(String[] args) {
     V8 v8 = V8.createV8Runtime();
     Object result = v8.executeScript("1+1");
     System.out.println("Result: " + result);
     result = v8.executeScript("\"Hello\"");
     System.out.println("Result: " + result);
     v8.release();
    }
}

Result:
Result: 2
Result: Hello


2. Execute JSON expression

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import com.eclipsesource.v8.V8;
import com.eclipsesource.v8.V8Object;

public class Json {
    public static void main(String[] args) {
     V8 v8 = V8.createV8Runtime();
     V8Object v8obj = v8.executeObjectScript("var me = {First: 'Robert', Middle: 'Ian', Last: 'Bull', age: 38}; me;");
     String name = (String) v8obj.getString("Last");
     int age = v8obj.getInteger("age");
     System.out.println("Name: " + name);
     System.out.println("Age: " + age);
     v8obj.release();
     v8.release();
    }
}

Result:
Name: Bull
Age: 38


3. Construct JavaScript Object from Java

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import com.eclipsesource.v8.V8;
import com.eclipsesource.v8.V8Object;
import com.eclipsesource.v8.utils.V8ObjectUtils;
import java.util.Map;

public class JSObject {
    public static void main(String[] args) {
     V8 v8 = V8.createV8Runtime();
     V8Object v8obj = new V8Object(v8);
     v8obj.add("First", "Robert");
     v8obj.add("Last", "Bull");
     v8obj.add("Age", 38);
        Map<String, Object> map = V8ObjectUtils.toMap(v8obj);
        System.out.println("Name: " + map.get("Last"));
        System.out.println("Age: " + map.get("Age"));
     v8obj.release();
     v8.release();
    }    
}

Result:
Name: Bull
Age: 38


4. Call Java function from Java Script (void)

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import com.eclipsesource.v8.JavaVoidCallback;
import com.eclipsesource.v8.V8;
import com.eclipsesource.v8.V8Array;
import com.eclipsesource.v8.V8Object;

public class CallbackVoid {
    public static void main(String[] args) {
     V8 v8 = V8.createV8Runtime();
     v8.registerJavaMethod(new JavaVoidCallback() {
            @Override
            public void invoke(final V8Object receiver, final V8Array args) {
                if (args.length() > 0) {
                    for( int i=0; i < args.length(); i++ ) {
                        System.out.println(args.get(i));
                    }
                }
            }
        }, "foo");
     v8.executeScript("foo('a',false, undefined)");
     v8.release();
    }      
}

Result:
a
false
undefined


5. Call Java function from Java Script (Integer)


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import com.eclipsesource.v8.JavaCallback;
import com.eclipsesource.v8.V8;

public class CallbackInteger {
    public static void main(String[] mainArgs) {
     V8 v8 = V8.createV8Runtime();
     v8.registerJavaMethod( (JavaCallback) (receiver, args) -> {
            if (args.length() > 0) {
             for( int i=0; i < args.length(); i++ ) {
                 System.out.println(args.get(i));
             }
            }      
            return 100;
        }, "bar");
     int v = (int)(Integer)v8.executeIntegerScript("bar('a',false, undefined)");
     System.out.println("v =" + v);
     v8.release();
    }      
}

Result:
a
false
undefined
v =100










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