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- package com.yaozhitech.spring5.common.util;
- import java.lang.reflect.Field;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- import java.lang.reflect.Modifier;
- import java.lang.reflect.ParameterizedType;
- import java.lang.reflect.Type;
- import org.apache.commons.lang3.StringUtils;
- import org.apache.commons.lang3.Validate;
- import org.slf4j.Logger;
- import org.slf4j.LoggerFactory;
- import org.springframework.util.Assert;
- /**
- * 反射工具类.
- * 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
- * @author calvin
- * @version 2013-01-15
- */
- @SuppressWarnings("rawtypes")
- public class ReflectionUtils {
-
- private static final String SETTER_PREFIX = "set";
- private static final String GETTER_PREFIX = "get";
- private static final String CGLIB_CLASS_SEPARATOR = "$$";
-
- private static Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);
- /**
- * 调用Getter方法.
- * 支持多级,如:对象名.对象名.方法
- */
- public static Object invokeGetter(Object obj, String propertyName) {
- Object object = obj;
- for (String name : StringUtils.split(propertyName, ".")){
- String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
- object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
- }
- return object;
- }
- /**
- * 调用Setter方法, 仅匹配方法名。
- * 支持多级,如:对象名.对象名.方法
- */
- public static void invokeSetter(Object obj, String propertyName, Object value) {
- Object object = obj;
- String[] names = StringUtils.split(propertyName, ".");
- for (int i=0; i<names.length; i++){
- if(i<names.length-1){
- String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(names[i]);
- object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
- }else{
- String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(names[i]);
- invokeMethodByName(object, setterMethodName, new Object[] { value });
- }
- }
- }
- /**
- * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
- */
- public static Object getFieldValue(final Object obj, final String fieldName) {
- Field field = getAccessibleField(obj, fieldName);
- if (field == null) {
- throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
- }
- Object result = null;
- try {
- result = field.get(obj);
- } catch (IllegalAccessException e) {
- logger.error("不可能抛出的异常{}", e.getMessage());
- }
- return result;
- }
- /**
- * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
- */
- public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
- Field field = getAccessibleField(obj, fieldName);
- if (field == null) {
- logger.error("Could not find field [" + fieldName + "] on target [" + obj + "]");
- return;
- //throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
- }
- try {
- field.set(obj, convert(value, field.getType()));
- } catch (IllegalAccessException e) {
- logger.error("不可能抛出的异常:{}", e.getMessage());
- }
- }
-
- public static Object convert(Object object, Class<?> type) {
- if (object instanceof Number) {
- Number number = (Number) object;
- if (type.equals(byte.class) || type.equals(Byte.class)) {
- return number.byteValue();
- }
- if (type.equals(short.class) || type.equals(Short.class)) {
- return number.shortValue();
- }
- if (type.equals(int.class) || type.equals(Integer.class)) {
- return number.intValue();
- }
- if (type.equals(long.class) || type.equals(Long.class)) {
- return number.longValue();
- }
- if (type.equals(float.class) || type.equals(Float.class)) {
- return number.floatValue();
- }
- if (type.equals(double.class) || type.equals(Double.class)) {
- return number.doubleValue();
- }
- }
- if(type.equals(String.class)){
- return object==null?"":object.toString();
- }
- return object;
- }
- /**
- * 直接调用对象方法, 无视private/protected修饰符.
- * 用于一次性调用的情况,否则应使用getAccessibleMethod()函数获得Method后反复调用.
- * 同时匹配方法名+参数类型,
- */
- public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
- final Object[] args) {
- Method method = getAccessibleMethod(obj, methodName, parameterTypes);
- if (method == null) {
- throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
- }
- try {
- return method.invoke(obj, args);
- } catch (Exception e) {
- throw convertReflectionExceptionToUnchecked(e);
- }
- }
- /**
- * 直接调用对象方法, 无视private/protected修饰符,
- * 用于一次性调用的情况,否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
- * 只匹配函数名,如果有多个同名函数调用第一个。
- */
- public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
- Method method = getAccessibleMethodByName(obj, methodName);
- if (method == null) {
- throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
- }
- try {
- return method.invoke(obj, args);
- } catch (Exception e) {
- throw convertReflectionExceptionToUnchecked(e);
- }
- }
- /**
- * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
- *
- * 如向上转型到Object仍无法找到, 返回null.
- */
- public static Field getAccessibleField(final Object obj, final String fieldName) {
- Validate.notNull(obj, "object can't be null");
- Validate.notBlank(fieldName, "fieldName can't be blank");
- for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
- try {
- Field field = superClass.getDeclaredField(fieldName);
- makeAccessible(field);
- return field;
- } catch (NoSuchFieldException e) {//NOSONAR
- // Field不在当前类定义,继续向上转型
- continue;// new add
- }
- }
- return null;
- }
- /**
- * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
- * 如向上转型到Object仍无法找到, 返回null.
- * 匹配函数名+参数类型。
- *
- * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
- */
- public static Method getAccessibleMethod(final Object obj, final String methodName,
- final Class<?>... parameterTypes) {
- Validate.notNull(obj, "object can't be null");
- Validate.notBlank(methodName, "methodName can't be blank");
- for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
- try {
- Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
- makeAccessible(method);
- return method;
- } catch (NoSuchMethodException e) {
- // Method不在当前类定义,继续向上转型
- continue;// new add
- }
- }
- return null;
- }
- /**
- * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
- * 如向上转型到Object仍无法找到, 返回null.
- * 只匹配函数名。
- *
- * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
- */
- public static Method getAccessibleMethodByName(final Object obj, final String methodName) {
- Validate.notNull(obj, "object can't be null");
- Validate.notBlank(methodName, "methodName can't be blank");
- for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
- Method[] methods = searchType.getDeclaredMethods();
- for (Method method : methods) {
- if (method.getName().equals(methodName)) {
- makeAccessible(method);
- return method;
- }
- }
- }
- return null;
- }
- /**
- * 改变private/protected的方法为public,尽量不调用实际改动的语句,避免JDK的SecurityManager抱怨。
- */
- public static void makeAccessible(Method method) {
- if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
- && !method.isAccessible()) {
- method.setAccessible(true);
- }
- }
- /**
- * 改变private/protected的成员变量为public,尽量不调用实际改动的语句,避免JDK的SecurityManager抱怨。
- */
- public static void makeAccessible(Field field) {
- if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier
- .isFinal(field.getModifiers())) && !field.isAccessible()) {
- field.setAccessible(true);
- }
- }
- /**
- * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
- * 如无法找到, 返回Object.class.
- * eg.
- * public UserDao extends HibernateDao<User>
- *
- * @param clazz The class to introspect
- * @return the first generic declaration, or Object.class if cannot be determined
- */
- @SuppressWarnings("unchecked")
- public static <T> Class<T> getClassGenricType(final Class clazz) {
- return getClassGenricType(clazz, 0);
- }
- /**
- * 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
- * 如无法找到, 返回Object.class.
- *
- * 如public UserDao extends HibernateDao<User,Long>
- *
- * @param clazz clazz The class to introspect
- * @param index the Index of the generic ddeclaration,start from 0.
- * @return the index generic declaration, or Object.class if cannot be determined
- */
- public static Class getClassGenricType(final Class clazz, final int index) {
- Type genType = clazz.getGenericSuperclass();
- if (!(genType instanceof ParameterizedType)) {
- logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
- return Object.class;
- }
- Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
- if (index >= params.length || index < 0) {
- logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
- + params.length);
- return Object.class;
- }
- if (!(params[index] instanceof Class)) {
- logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
- return Object.class;
- }
- return (Class) params[index];
- }
-
- public static Class<?> getUserClass(Object instance) {
- Assert.notNull(instance, "Instance must not be null");
- Class clazz = instance.getClass();
- if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
- Class<?> superClass = clazz.getSuperclass();
- if (superClass != null && !Object.class.equals(superClass)) {
- return superClass;
- }
- }
- return clazz;
- }
-
- /**
- * 将反射时的checked exception转换为unchecked exception.
- */
- public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
- if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
- || e instanceof NoSuchMethodException) {
- return new IllegalArgumentException(e);
- } else if (e instanceof InvocationTargetException) {
- return new RuntimeException(((InvocationTargetException) e).getTargetException());
- } else if (e instanceof RuntimeException) {
- return (RuntimeException) e;
- }
- return new RuntimeException("Unexpected Checked Exception.", e);
- }
- /**
- * 判断某个对象是否拥有某个属性
- *
- * @param obj 对象
- * @param fieldName 属性名
- * @return 有属性返回true
- * 无属性返回false
- */
- public static boolean hasField(final Object obj, final String fieldName){
- Field field = getAccessibleField(obj, fieldName);
- if (field == null) {
- return false;
- }
- return true;
- }
- }
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