net.hasor.utils.BeanUtils Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.hasor.utils;
import net.hasor.utils.convert.ConverterUtils;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
*
* @version : 2011-6-3
* @author 赵永春 ([email protected])
*/
public class BeanUtils {
/**获取指定类型的默认值。*/
public static Object getDefaultValue(final Class returnType) {
if (returnType == null || !returnType.isPrimitive()) {
return null;
}
//
if (returnType == int.class) {
return 0;
} else if (returnType == byte.class) {
return (byte) 0;
} else if (returnType == char.class) {
return '\0';
} else if (returnType == double.class) {
return 0d;
} else if (returnType == float.class) {
return 0f;
} else if (returnType == long.class) {
return 0L;
} else if (returnType == short.class) {
return (short) 0;
} else if (returnType == boolean.class) {
return false;
} else if (returnType == void.class) {
return null;
} else if (returnType.isArray()) {
return null;
}
return null;
}
public static Object[] getDefaultValue(Class[] paramArray) {
if (paramArray == null) {
return null;
}
Object[] objs = new Object[paramArray.length];
for (int i = 0; i < paramArray.length; i++) {
objs[i] = getDefaultValue(paramArray[i]);
}
return objs;
}
/**
* 该方法的作用是反射的形式调用目标的方法。
* @param target 被调用的对象
* @param methodName 要调用的反射方法名。
* @param objects 参数列表
*/
public static Object invokeMethod(final Object target, final String methodName, final Object... objects) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
if (target == null) {
return null;
}
Class targetType = target.getClass();
Method invokeMethod = null;
//反射调用方法
Method[] ms = targetType.getMethods();
for (Method m : ms) {
//1.名字不相等的忽略
if (!m.getName().equals(methodName)) {
continue;
}
//2.目标方法参数列表个数与types字段中存放的个数不一样的忽略。
Class[] paramTypes = m.getParameterTypes();
if (paramTypes.length != objects.length) {
continue;
}
//3.如果有参数类型不一样的也忽略---1
boolean isFind = true;
for (int i = 0; i < paramTypes.length; i++) {
Object param_object = objects[i];
if (param_object == null) {
continue;
}
//
if (!paramTypes[i].isAssignableFrom(param_object.getClass())) {
isFind = false;
break;
}
}
//5.如果有参数类型不一样的也忽略---2
if (!isFind) {
continue;
}
//符合条件执行调用
invokeMethod = m;
}
if (invokeMethod == null) {
throw new NullPointerException(methodName + " invokeMethod is null.");
} else {
return invokeMethod.invoke(target, objects);
}
}
/*----------------------------------------------------------------------------------------*/
/**获取类定义的字段和继承父类中定义的字段以及父类的父类（子类重新定义同名字段也会被列入集合）。*/
public static List findALLFields(final Class target) {
if (target == null) {
return null;
}
ArrayList fList = new ArrayList<>();
BeanUtils.findALLFields(target, fList);
return fList;
}
private static void findALLFields(final Class target, final ArrayList fList) {
if (target == null) {
return;
}
for (Field field : target.getDeclaredFields()) {
if (!fList.contains(field)) {
fList.add(field);
}
}
for (Field field : target.getFields()) {
if (!fList.contains(field)) {
fList.add(field);
}
}
Class superType = target.getSuperclass();
if (superType == null || superType == target) {
return;
}
BeanUtils.findALLFields(superType, fList);
}
/**获取类定义的方法和继承父类中定义的方法以及父类的父类（子类的重写方法也会被返回）。*/
public static List findALLMethods(final Class target) {
if (target == null) {
return null;
}
ArrayList mList = new ArrayList<>();
BeanUtils.findALLMethods(target, mList);
return mList;
}
private static void findALLMethods(final Class target, final ArrayList mList) {
if (target == null) {
return;
}
for (Method method : target.getDeclaredMethods()) {
if (!mList.contains(method)) {
mList.add(method);
}
}
for (Method method : target.getMethods()) {
if (!mList.contains(method)) {
mList.add(method);
}
}
Class superType = target.getSuperclass();
if (superType == null || superType == target) {
return;
}
BeanUtils.findALLMethods(superType, mList);
}
/*----------------------------------------------------------------------------------------*/
/**查找一个可操作的字段列表。*/
public static List getFields(final Class type) {
return Arrays.asList(type.getFields());
}
/**查找一个可操作的方法列表。*/
public static List getMethods(final Class type) {
return Arrays.asList(type.getMethods());
}
/**查找一个可操作的字段。*/
public static Field getField(final String fieldName, final Class type) {
if (fieldName == null || type == null) {
return null;
}
for (Field f : type.getFields()) {
if (f.getName().equals(fieldName)) {
return f;
}
}
return null;
}
/**查找一个可操作的方法。*/
public static Method getMethod(final Class atClass, final String name, final Class[] paramType) {
try {
return atClass.getMethod(name, paramType);
} catch (Exception e) {
try {
return atClass.getDeclaredMethod(name, paramType);
} catch (Exception e1) {
return null;
}
}
}
/**获取属性名集合，该方法是{@link #getPropertys(Class)}方法的升级版，通过该方法还可以同时返回可访问的字段作为属性。*/
public static List getPropertysAndFields(final Class target) {
List mnames = BeanUtils.getPropertys(target);
List fnames = BeanUtils.getFields(target);
for (Field f : fnames) {
String fName = f.getName();
if (!mnames.contains(fName)) {
mnames.add(fName);
}
}
return mnames;
}
/**获取属性名集合，被包含的属性可能有些只是只读属性，有些是只写属性。也有读写属性。*/
public static List getPropertys(final Class target) {
List mnames = new ArrayList<>();
List ms = BeanUtils.getMethods(target);
for (Method m : ms) {
String name = m.getName();
if (name.startsWith("get") || name.startsWith("set")) {
name = name.substring(3);
} else if (name.startsWith("is")) {
name = name.substring(2);
} else {
continue;
}
if (!name.equals("")) {
name = StringUtils.firstCharToLowerCase(name);
if (!mnames.contains(name)) {
mnames.add(name);
}
}
}
return mnames;
}
/**获取属性名集合，被包含的属性可能有些只是只读属性，有些是只写属性。也有读写属性。*/
public static PropertyDescriptor[] getPropertyDescriptors(final Class defineType) {
List mnames = new ArrayList<>();
List ms = BeanUtils.getPropertys(defineType);
for (String m : ms) {
try {
mnames.add(new PropertyDescriptor(m, defineType));
} catch (Exception e) {
}
}
return mnames.toArray(new PropertyDescriptor[0]);
}
/**获取一个属性的读取方法。*/
public static Method getReadMethod(final String property, final Class target) {
if (property == null || target == null) {
return null;
}
String methodName_1 = "get" + StringUtils.firstCharToUpperCase(property);
String methodName_2 = "is" + StringUtils.firstCharToUpperCase(property);
//
for (Method m : target.getMethods()) {
if (m.getParameterTypes().length == 0) {
String methodName = m.getName();
if (methodName.equals(methodName_1)) {
return m;
}
/*是否是布尔*/
if (methodName.equals(methodName_2)) {
Class t = m.getReturnType();
if (t == Boolean.class || t == boolean.class) {
return m;
}
}
}
}
return null;
}
/**获取一个属性的写入方法。*/
public static Method getWriteMethod(final String property, final Class target) {
if (property == null || target == null) {
return null;
}
String methodName = "set" + StringUtils.firstCharToUpperCase(property);
for (Method m : target.getMethods()) {
if (m.getName().equals(methodName)) {
if (m.getParameterTypes().length == 1) {
return m;
}
}
}
return null;
}
/**测试是否具有propertyName所表示的属性，无论是读或写方法只要存在一个就表示存在该属性。*/
public static boolean hasProperty(final String propertyName, final Class target) {
//get、set方法
if (BeanUtils.getReadMethod(propertyName, target) == null) {
return BeanUtils.getWriteMethod(propertyName, target) != null;
}
return true;
}
/**测试是否具有fieldName所表示的字段，无论是读或写方法只要存在一个就表示存在该属性。*/
public static boolean hasField(final String propertyName, final Class target) {
return BeanUtils.getField(propertyName, target) != null;
}
/**测试是否具有name所表示的属性，hasProperty或hasField有一个返回为true则返回true。*/
public static boolean hasPropertyOrField(final String name, final Class target) {
if (!BeanUtils.hasProperty(name, target)) {
return BeanUtils.hasField(name, target);
}
return true;
}
/**测试是否支持readProperty方法。返回true表示可以进行读取操作。*/
public static boolean canReadProperty(final String propertyName, final Class target) {
Method readMethod = BeanUtils.getReadMethod(propertyName, target);
return readMethod != null;
}
/**测试是否支持readPropertyOrField方法。*/
public static boolean canReadPropertyOrField(final String propertyName, final Class target) {
if (!BeanUtils.canReadProperty(propertyName, target)) {
return BeanUtils.hasField(propertyName, target);
}
return true;
}
/**测试是否支持writeProperty方法。返回true表示可以进行写入操作。*/
public static boolean canWriteProperty(final String propertyName, final Class target) {
Method writeMethod = BeanUtils.getWriteMethod(propertyName, target);
return writeMethod != null;
}
/**测试是否支持Field方法写。*/
public static boolean canWriteField(final String propertyName, final Class target) {
Field field = getField(propertyName, target);
return field != null && !Modifier.isFinal(field.getModifiers());
}
/**测试是否支持writePropertyOrField方法。*/
public static boolean canWritePropertyOrField(final String propertyName, final Class target) {
if (!BeanUtils.canWriteProperty(propertyName, target)) {
return BeanUtils.canWriteField(propertyName, target);
}
return true;
}
/*----------------------------------------------------------------------------------------*/
/**执行属性注入，除了注入int,short,long,等基本类型之外该方法还支持注入枚举类型。返回值表示执行是否成功。注意：该方法会根据属性类型进行尝试类型转换。*/
public static boolean writeProperty(final Object object, final String attName, final Object value) {
if (object == null || attName == null) {
return false;
}
//1.查找方法
Class defineType = object.getClass();
Method writeMethod = BeanUtils.getWriteMethod(attName, defineType);
if (writeMethod == null) {
return false;
}
//2.执行属性转换
Class toType = writeMethod.getParameterTypes()[0];
Object attValueObject = ConverterUtils.convert(toType, value);
//3.执行属性注入
try {
writeMethod.invoke(object, attValueObject);
return true;
} catch (Exception e) {
return false;
}
}
/**执行字段注入，除了注入int,short,long,等基本类型之外该方法还支持注入枚举类型。注意：该方法会根据属性类型进行尝试类型转换。*/
public static boolean writeField(final Object object, final String fieldName, final Object value) {
if (object == null || fieldName == null) {
return false;
}
//1.查找方法
Class defineType = object.getClass();
Field writeField = BeanUtils.getField(fieldName, defineType);
if (writeField == null) {
return false;
}
//2.执行属性转换
Class toType = writeField.getType();
Object attValueObject = ConverterUtils.convert(toType, value);
//3.执行属性注入
try {
writeField.set(object, attValueObject);
return true;
} catch (Exception e) {
return false;
}
}
/**执行注入，该方法首先会试图执行属性方法注入。如果失败则执行字段注入。注意：该方法会根据属性类型进行尝试类型转换。*/
public static boolean writePropertyOrField(final Object object, final String attName, final Object value) {
Class defineType = object.getClass();
if (BeanUtils.canWriteProperty(attName, defineType)) {
return BeanUtils.writeProperty(object, attName, value);//支持方法写入
}
if (BeanUtils.hasField(attName, defineType)) {
return BeanUtils.writeField(object, attName, value);//支持字段写入
}
return false;
}
/**执行属性读取。*/
public static Object readProperty(final Object object, final String attName) {
if (object == null || attName == null) {
return false;
}
//1.查找方法
Class defineType = object.getClass();
Method readMethod = BeanUtils.getReadMethod(attName, defineType);
if (readMethod == null) {
return null;
}
//2.执行属性读取
try {
return readMethod.invoke(object);
} catch (Exception e) {
return null;
}
}
/**执行字段读取。*/
public static Object readField(final Object object, final String fieldName) {
if (object == null || fieldName == null) {
return null;
}
//1.查找方法
Class defineType = object.getClass();
Field readField = BeanUtils.getField(fieldName, defineType);
if (readField == null) {
return null;
}
//2.执行字段读取
try {
return readField.get(object);
} catch (Exception e) {
return null;
}
}
/**执行注入，该方法首先会试图执行属性方法注入。如果失败则执行字段注入。注意：该方法会根据属性类型进行尝试类型转换。*/
public static Object readPropertyOrField(final Object object, final String attName) {
Class defineType = object.getClass();
if (BeanUtils.canReadProperty(attName, defineType)) {
return BeanUtils.readProperty(object, attName);//支持方法读取
}
if (BeanUtils.hasField(attName, defineType)) {
return BeanUtils.readField(object, attName);//支持字段读取
}
return null;
}
/***/
public static Class getPropertyType(final Class defineType, final String attName) {
try {
PropertyDescriptor pd = new PropertyDescriptor(attName, defineType);
return pd.getPropertyType();
} catch (Exception e) {
return null;
}
}
/***/
public static Class getFieldType(final Class defineType, final String attName) {
Field readField = BeanUtils.getField(attName, defineType);
if (readField != null) {
return readField.getType();
}
return null;
}
/***/
public static Class getPropertyOrFieldType(final Class defineType, final String attName) {
Class propType = null;
//
propType = BeanUtils.getPropertyType(defineType, attName);
if (propType != null) {
return propType;
}
propType = BeanUtils.getFieldType(defineType, attName);
return propType;
}
/***/
public static void copyProperties(final Object dest, final Object orig) {
if (dest == null) {
throw new IllegalArgumentException("dest is null");
}
if (orig == null) {
throw new IllegalArgumentException("orig is null");
}
//
List propNames = new ArrayList<>();
if (orig instanceof Map) {
for (Object key : ((Map) orig).keySet()) {
propNames.add(key.toString());
}
} else {
propNames = BeanUtils.getPropertys(orig.getClass());
}
for (String prop : propNames) {
BeanUtils.copyProperty(dest, orig, prop);
}
}
/***/
public static void copyProperty(final Object dest, final Object orig, final String propertyName) {
if (dest == null) {
throw new IllegalArgumentException("dest is null");
}
if (orig == null) {
throw new IllegalArgumentException("orig is null");
}
if (StringUtils.isBlank(propertyName)) {
throw new IllegalArgumentException("propertyName is null");
}
//
if (!(orig instanceof Map)) {
if (!BeanUtils.canReadPropertyOrField(propertyName, orig.getClass())) {
return;
}
}
if (!(dest instanceof Map)) {
if (!BeanUtils.canWritePropertyOrField(propertyName, dest.getClass())) {
return;
}
}
//
Object val = null;
if (!(orig instanceof Map)) {
val = BeanUtils.readPropertyOrField(orig, propertyName);
} else {
val = ((Map) orig).get(propertyName);
}
//
if (!(dest instanceof Map)) {
BeanUtils.writePropertyOrField(dest, propertyName, val);
} else {
((Map) orig).put(propertyName, val);
}
}
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