揭秘如何設定價值

Question

如果MVel表達式為true，則需要設置屬性的值。 誰能幫我，怎么做。

示例代碼如下：

      LineItem lineItem = new LineItem();

      Address address = new Address();
        address.setAddress1("ABC");
        address.setAddress2("PA");

      lineItem.setShipFromAddress(address);

    ParserContext parserContext = ParserContext.create();
    parserContext.stronglyTyped().withInput("lineItem",LineItem.class)
          .withInput("shipFromAddress", Address.class);

        Object compiledWithSet = MVEL.compileExpression("( shipFromAddress.address1 contains 'ABC' || shipFromAddress.address1 contains 'ABC DEF' ) && (shipFromAddress.address2 contains 'PA') ? setShipFromLocation('PA1') : ",parserContext);
        MVEL.executeExpression(compiledWithSet, lineItem);

Answer 1

您的問題有解決方案，但是您可以詳細說明用例。 這是一個小樣本答案，希望這可以幫助您入門。

public class MyMaths {

    int a;

    public int getA() {
        return a;
    }

    public void setA(int a) {
        this.a = a;
    }
}

public static void main(String[] args) {

        Map map = new HashMap();
        MyMaths mayMaths = new MyMaths();
        map.put("obj", mayMaths);
        map.put("name", "Ankur");

        String expression1 = "obj.a = ( name == 'Ankur') ? 20 : 25";

        Serializable compiled1 = MVEL.compileExpression(expression1);

        MVEL.executeExpression(compiled1, map);

        System.out.println(mayMaths.getA());

    }

所以在這里我實際上是將值賦給MyMaths類的變量“ a ”

輸出-20

現在將值從“ Ankur”更改為“ XYZ”，輸出將為25。