java通过反射获取类信息工具

package cn.pde.utils;import java.lang.annotation.Annotation;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.HashMap;import java.util.Map;import org.apache.commons.lang3.StringUtils;public class ReflectUtil {public static Map<String,Annotation[]> getFieldNameAndAnnatationsMap(Class clazz) {Map<String,Annotation[]> ret = new HashMap<String, Annotation[]>();Field[] fields = clazz.getDeclaredFields();for(Field field : fields) {ret.put(field.getName(), field.getAnnotations());}return ret;}public static Map<String,Annotation> getFieldNameAndAnnotationMap(Class clazz,Class annoClass) {Map<String,Annotation> ret = new HashMap<String, Annotation>();Field[] fields = clazz.getDeclaredFields();for(Field field : fields) {ret.put(field.getName(), field.getAnnotation(annoClass));}return ret;}public static Annotation getObjAnnotation(Class objClass,Class annoClass) {return objClass.getAnnotation(annoClass);}/** * 获取类成员变量相应注解的变量值 * eg: ReflectUtil.getAnnoFieldValue(OrgInfo.class, "parent", Column.class, "name")  *  的作用为：获取OrgInfo类中parent变量的@Column注解中的name属性值 * @param objClass * @param objFieldName * @param annoClass * @param annoFieldName * @return */public static Object getAnnoFieldValue(Class<?> objClass,String objFieldName,Class<?> annoClass, String annoFieldName) {Object ret = null;Map<String,Annotation> fieldNameAndAnnatationMap = getFieldNameAndAnnotationMap(objClass, annoClass);Annotation anno = fieldNameAndAnnatationMap.get(objFieldName);if(anno != null) {try {Method method = annoClass.getMethod(annoFieldName); //Annotation中的成员变量以方法的形式来定义ret = method.invoke(anno);} catch (SecurityException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} }return ret;}/** * 获取对象实例中成员变量值（包含父类） * @param obj 对象实例 * @param fieldName 变量名 * @return */public static Object getFieldValue(Object obj, String fieldName) {Object ret = null;Field field = getField(obj.getClass(), fieldName);if(field != null) {field.setAccessible(true);try {ret = field.get(obj);} catch (Exception e) {e.printStackTrace();}}return ret;}/* * 获取类属性（包含父类） */public static Field getField(Class<?> clazz, String fieldName) {Field ret = null;if (clazz != null && !StringUtils.isBlank(fieldName)) {try {fieldName = fieldName.trim();ret = clazz.getDeclaredField(fieldName);} catch (Exception e) {//如没找到，则从父类继续查找ret = getField(clazz.getSuperclass(), fieldName);}}return ret;}}