用吸气剂获得现场链价值
//n o w j a v a . c o m - 时 代 Java 提 供 import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Collection; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; public class Main{ public static void main(String[] argv) throws Exception{ Object baseObject = "nowjava.com"; String fieldNameChain = "nowjava.com"; System.out.println(getFieldChainValueWithGetters(baseObject,fieldNameChain)); } /** from 时代Java公众号**/ private static Logger log = Logger.getLogger(BeanUtil.class .getSimpleName()); public static Object getFieldChainValueWithGetters(Object baseObject, String fieldNameChain) { String[] chain = fieldNameChain.split("[.]"); if (chain.length == 1) return getFieldValueWithGetter(baseObject, chain[0]); return getFieldChainValueWithGetters( getFieldValueWithGetter(baseObject, chain[0]), fieldNameChain.substring(chain[0].length() + 1)); } public static Object getFieldValueWithGetter(Object obj, Field field) { try { Method m = getGetterMethodForField(obj, field); m.setAccessible(true); return m.invoke(obj); } catch (NoSuchMethodException e) { log.log(Level.INFO, "No getter for field: " + field.getName() + ", using field it's self", e); try { field.setAccessible(true); return field.get(obj); } catch (Throwable iae) { log.log(Level.SEVERE, "Unable to access field even after enabling access.", iae); } } catch (InvocationTargetException e) { log.log(Level.SEVERE, "Unable to invoke getter on supplied object: " + obj + ", field: " + field.getName(), e); } catch (IllegalAccessException e) { log.log(Level.SEVERE, "Access not allowed on explicitly marked accessible field through reflection.", e); } return null; } public static Object getFieldValueWithGetter(Object obj, String fieldName) { try { return getFieldValueWithGetter(obj, obj.getClass() .getDeclaredField(fieldName)); } catch (NoSuchFieldException e) { log.log(Level.SEVERE, "Unable to find field on object", e); return null; } } public static Method getGetterMethodForField(Object obj, Field field) throws NoSuchMethodException { try { return obj.getClass().getDeclaredMethod( getGetterMethodNameForField(obj, field)); } catch (NoSuchMethodException nsme) { log.log(Level.WARNING, "Can't find method.", nsme); throw nsme; } } public static Method getGetterMethodForField(Object obj, String fieldName) throws NoSuchMethodException, NoSuchFieldException { return obj.getClass().getDeclaredMethod( getGetterMethodNameForField(fieldName, obj.getClass() .getDeclaredField(fieldName))); } public static Method getGetterMethodForField(Class obj, String fieldName) throws NoSuchMethodException, NoSuchFieldException { return obj.getDeclaredMethod(getGetterMethodNameForField(fieldName, obj.getDeclaredField(fieldName