种一棵树最好的时间是十年前,其次是现在
在某些场景里Javabean包含了大量的字段，很多程序员会通过一个一个set get来匹配，这种写法不但繁琐而且代码冗余不好看且维护起来很麻烦，我们可以通过反射来解决：
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/** * 通过反射简化模型中多次get set方法 * */ public class ReflectionTest { public Map<String, String> adapteModel(String[] paramList, DemoModel model) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { Map<String, String> map = new HashMap<>(); for (int i = 0; i < paramList.length; i++) { String methodName = "get" + paramList[i]; Class<? extends DemoModel> clazz = model.getClass(); Method method = clazz.getDeclaredMethod(methodName); map.put(paramList[i], (String) method.invoke(model)); } return map; } public static void main(String[] args) { DemoModel model = new DemoModel(); model.setAge("55"); model.setHeight("1.78"); ReflectionTest reflectionTest = new ReflectionTest(); // 只要满足命名规范约定的，增加paramList就能获取需要的字段 String[] paramList = { "Height", "Age" }; try { System.out.println(reflectionTest.adapteModel(paramList, model)); } catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { e.printStackTrace(); } } } |
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import lombok.Data; @Data public class DemoModel { private String height; private String weight; private String age; } |
之后如果DemoModel再扩展字段，不再需要额外地写set、get，只要满足set、get的命名规范约定，直接在paramList里面补充字段名字就可以，后续可扩展性好很多。