OGNL - Object Graph Navigation Library

1 优点

• 比BeanUtils有更多的操作属性的能力，比如操作List[index]属性

2 实践

• 引入jar包

        <dependency>
            <groupId>ognl</groupId>
            <artifactId>ognl</artifactId>
            <version>3.2</version>
        </dependency>

• get & set

        HashMap map = new HashMap();
        List list= new ArrayList();
        list.add("a");      
        list.add("b");
        list.add("c");
        map.put("list", list);
        // getValue, p1 => ognl expression, p2 => root element, r => b
        Object r = Ognl.getValue("list[1]", map);
        // setValue, , p1 => ognl expression, p2 => root element, p3=> new value
        Ognl.setValue("list[1]", map, "aaa");