Mvel如何设置值

Question

如果MVel表达式为真，则需要设置属性的值。有谁能帮帮我，怎么做。

示例代码如下：

      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

你的问题有一个解决方案，但你能详细描述一下你的用例吗？这是一个小的示例答案，希望这能帮助你开始。

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());

    }

因此，这里我实际上是将值赋给类MyMaths的变量"a“

输出- 20

现在将值从'Ankur‘更改为'XYZ'，输出将为25。