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com.xiaoleilu.hutool.util.BeanUtil Maven / Gradle / Ivy

package com.xiaoleilu.hutool.util;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;

import com.xiaoleilu.hutool.convert.Convert;
import com.xiaoleilu.hutool.exceptions.UtilException;

/**
 * Bean工具类
 * 
 * @author Looly
 *
 */
public final class BeanUtil {
	
	private BeanUtil() {}
	
	/**
	 * 判断是否为Bean对象
	 * @param clazz 待测试类
	 * @return 是否为Bean对象
	 */
	public static boolean isBean(Class clazz){
		if(ClassUtil.isNormalClass(clazz)){
			Method[] methods = clazz.getMethods();
			for (Method method : methods) {
				if(method.getParameterTypes().length == 1 && method.getName().startsWith("set")){
					//检测包含标准的setXXX方法即视为标准的JavaBean
					return true;
				}
			}
		}
		return false;
	}
	
	public static PropertyEditor findEditor(Class type){
		return PropertyEditorManager.findEditor(type);
	}

	/**
	 * 获得Bean字段描述数组
	 * 
	 * @param clazz Bean类
	 * @return 字段描述数组
	 * @throws IntrospectionException
	 */
	public static PropertyDescriptor[] getPropertyDescriptors(Class clazz) throws IntrospectionException {
		return Introspector.getBeanInfo(clazz).getPropertyDescriptors();
	}
	
	/**
	 * 获得字段名和字段描述Map
	 * @param clazz Bean类
	 * @return 字段名和字段描述Map
	 * @throws IntrospectionException
	 */
	public static Map getFieldNamePropertyDescriptorMap(Class clazz) throws IntrospectionException{
		final PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(clazz);
		Map map = new HashMap<>();
		for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
			map.put(propertyDescriptor.getName(), propertyDescriptor);
		}
		return map;
	}

	/**
	 * 获得Bean类属性描述
	 * 
	 * @param clazz Bean类
	 * @param fieldName 字段名
	 * @return PropertyDescriptor
	 * @throws IntrospectionException
	 */
	public static PropertyDescriptor getPropertyDescriptor(Class clazz, final String fieldName) throws IntrospectionException {
		PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(clazz);
		for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
			if (ObjectUtil.equal(fieldName, propertyDescriptor.getName())) {
				return propertyDescriptor;
			}
		}
		return null;
	}
	
	/**
	 * Map转换为Bean对象
	 * 
	 * @param map {@link Map}
	 * @param beanClass Bean Class
	 * @param isIgnoreError 是否忽略注入错误
	 * @return Bean
	 */
	public static  T mapToBean(Map map, Class beanClass, boolean isIgnoreError) {
		return fillBeanWithMap(map, ClassUtil.newInstance(beanClass), isIgnoreError);
	}

	/**
	 * Map转换为Bean对象
* 忽略大小写 * * @param map Map * @param beanClass Bean Class * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T mapToBeanIgnoreCase(Map map, Class beanClass, boolean isIgnoreError) { return fillBeanWithMapIgnoreCase(map, ClassUtil.newInstance(beanClass), isIgnoreError); } /** * 使用Map填充Bean对象 * * @param map Map * @param bean Bean * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T fillBeanWithMap(final Map map, T bean, final boolean isIgnoreError) { return fillBean(bean, new ValueProvider(){ @Override public Object value(String name) { return map.get(name); } @Override public boolean isIgnoreError() { return isIgnoreError; } }); } /** * 使用Map填充Bean对象,可配置将下划线转换为驼峰 * * @param map Map * @param bean Bean * @param isToCamelCase 是否将下划线模式转换为驼峰模式 * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T fillBeanWithMap(Map map, T bean, boolean isToCamelCase, boolean isIgnoreError) { if(isToCamelCase){ final Map map2 = new HashMap(); for (Entry entry : map.entrySet()) { final Object key = entry.getKey(); if (null != key && key instanceof String) { final String keyStr = (String) key; map2.put(StrUtil.toCamelCase(keyStr), entry.getValue()); } else { map2.put(key, entry.getValue()); } } return fillBeanWithMap(map2, bean, isIgnoreError); } return fillBeanWithMap(map, bean, isIgnoreError); } /** * 使用Map填充Bean对象,忽略大小写 * * @param map Map * @param bean Bean * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T fillBeanWithMapIgnoreCase(Map map, T bean, final boolean isIgnoreError) { final Map map2 = new HashMap(); for (Entry entry : map.entrySet()) { final Object key = entry.getKey(); if (key instanceof String) { final String keyStr = (String) key; map2.put(keyStr.toLowerCase(), entry.getValue()); } else { map2.put(key, entry.getValue()); } } return fillBean(bean, new ValueProvider(){ @Override public Object value(String name) { return map2.get(name.toLowerCase()); } @Override public boolean isIgnoreError() { return isIgnoreError; } }); } /** * ServletRequest 参数转Bean * * @param request ServletRequest * @param beanClass Bean Class * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T requestParamToBean(javax.servlet.ServletRequest request, Class beanClass, boolean isIgnoreError) { return fillBeanWithRequestParam(request, ClassUtil.newInstance(beanClass), isIgnoreError); } /** * ServletRequest 参数转Bean * * @param request ServletRequest * @param bean Bean * @param isIgnoreError 是否忽略注入错误 * @return Bean */ public static T fillBeanWithRequestParam(final javax.servlet.ServletRequest request, T bean, final boolean isIgnoreError) { final String beanName = StrUtil.lowerFirst(bean.getClass().getSimpleName()); return fillBean(bean, new ValueProvider(){ @Override public Object value(String name) { String value = request.getParameter(name); if (StrUtil.isEmpty(value)) { // 使用类名前缀尝试查找值 value = request.getParameter(beanName + StrUtil.DOT + name); if (StrUtil.isEmpty(value)) { // 此处取得的值为空时跳过,包括null和"" value = null; } } return value; } @Override public boolean isIgnoreError() { return isIgnoreError; } }); } /** * ServletRequest 参数转Bean * * @param * @param beanClass Bean Class * @param valueProvider 值提供者 * @return Bean */ public static T toBean(Class beanClass, ValueProvider valueProvider) { return fillBean(ClassUtil.newInstance(beanClass), valueProvider); } /** * 填充Bean * * @param * @param bean Bean * @param valueProvider 值提供者 * @return Bean */ public static T fillBean(T bean, ValueProvider valueProvider) { if (null == valueProvider) { return bean; } Class beanClass = bean.getClass(); try { PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(beanClass); String propertyName; Object value; for (PropertyDescriptor property : propertyDescriptors) { propertyName = property.getName(); value = valueProvider.value(propertyName); if (null == value) { // 此处取得的值为空时跳过 continue; } try { property.getWriteMethod().invoke(bean, Convert.convert(property.getPropertyType(), value)); } catch (Exception e) { if(valueProvider.isIgnoreError()){ // StaticLog.warn("Inject [{}] error: {}", property.getName(), e.getMessage()); continue; }else{ throw new UtilException(e, "Inject [{}] error!", property.getName()); } } } } catch (Exception e) { throw new UtilException(e); } return bean; } /** * 对象转Map,不进行驼峰转下划线,不忽略值为空的字段 * * @param bean bean对象 * @return Map */ public static Map beanToMap(T bean) { return beanToMap(bean, false, false); } /** * 对象转Map * * @param bean bean对象 * @param isToUnderlineCase 是否转换为下划线模式 * @param ignoreNullValue 是否忽略值为空的字段 * @return Map */ public static Map beanToMap(T bean, boolean isToUnderlineCase, boolean ignoreNullValue) { if (bean == null) { return null; } Map map = new HashMap(); try { final PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(bean.getClass()); for (PropertyDescriptor property : propertyDescriptors) { String key = property.getName(); // 过滤class属性 if (false == key.equals("class")) { // 得到property对应的getter方法 Method getter = property.getReadMethod(); Object value = getter.invoke(bean); if (false == ignoreNullValue || null != value) { map.put(isToUnderlineCase ? StrUtil.toUnderlineCase(key) : key, value); } } } } catch (Exception e) { throw new UtilException(e); } return map; } /** * 复制Bean对象属性 * @param source 源Bean对象 * @param target 目标Bean对象 */ public static void copyProperties(Object source, Object target) { copyProperties(source, target, CopyOptions.create()); } /** * 复制Bean对象属性
* 限制类用于限制拷贝的属性,例如一个类我只想复制其父类的一些属性,就可以将editable设置为父类 * @param source 源Bean对象 * @param target 目标Bean对象 * @param ignoreProperties 不拷贝的的属性列表 */ public static void copyProperties(Object source, Object target, String... ignoreProperties) { copyProperties(source, target, CopyOptions.create().setIgnoreProperties(ignoreProperties)); } /** * 复制Bean对象属性
* 限制类用于限制拷贝的属性,例如一个类我只想复制其父类的一些属性,就可以将editable设置为父类 * @param source 源Bean对象 * @param target 目标Bean对象 * @param copyOptions 拷贝选项,见 {@link CopyOptions} */ public static void copyProperties(Object source, Object target, CopyOptions copyOptions) { if(null == copyOptions){ copyOptions = new CopyOptions(); } Class actualEditable = target.getClass(); if (copyOptions.editable != null) { //检查限制类是否为target的父类或接口 if (!copyOptions.editable.isInstance(target)) { throw new IllegalArgumentException(StrUtil.format("Target class [{}] not assignable to Editable class [{}]", target.getClass().getName(), copyOptions.editable.getName())); } actualEditable = copyOptions.editable; } PropertyDescriptor[] targetPds = null; Map sourcePdMap; try { sourcePdMap = getFieldNamePropertyDescriptorMap(source.getClass()); targetPds = getPropertyDescriptors(actualEditable); } catch (IntrospectionException e) { throw new UtilException(e); } HashSet ignoreSet = copyOptions.ignoreProperties != null ? CollectionUtil.newHashSet(copyOptions.ignoreProperties) : null; for (PropertyDescriptor targetPd : targetPds) { Method writeMethod = targetPd.getWriteMethod(); if (writeMethod != null && (ignoreSet == null || false == ignoreSet.contains(targetPd.getName()))) { PropertyDescriptor sourcePd = sourcePdMap.get(targetPd.getName()); if (sourcePd != null) { Method readMethod = sourcePd.getReadMethod(); // 源对象字段的getter方法返回值必须可转换为目标对象setter方法的第一个参数 if (readMethod != null && ClassUtil.isAssignable(writeMethod.getParameterTypes()[0], readMethod.getReturnType())) { try { Object value = ClassUtil.setAccessible(readMethod).invoke(source); if(null != value || false == copyOptions.isIgnoreNullValue){ ClassUtil.setAccessible(writeMethod).invoke(target, value); } } catch (Throwable ex) { if(copyOptions.isIgnoreError){ // StaticLog.warn("Copy property [{}] to [{}] error: {}", sourcePd.getName(), targetPd.getName(), ex.getMessage()); continue; } throw new UtilException(ex, "Copy property [{}] to [{}] error: {}", sourcePd.getName(), targetPd.getName(), ex.getMessage()); } } } } } } /** * 值提供者,用于提供Bean注入时参数对应值得抽象接口
* 继承或匿名实例化此接口
* 在Bean注入过程中,Bean获得字段名,通过外部方式根据这个字段名查找相应的字段值,然后注入Bean
* * @author Looly * */ public static interface ValueProvider { /** * 获取值 * * @param name Bean对象中参数名 * @return 对应参数名的值 */ public Object value(String name); /** * 是否忽略字段的注入错误 */ public boolean isIgnoreError(); } /** * 属性拷贝选项
* 包括:
* 1、限制的类或接口,必须为目标对象的实现接口或父类,用于限制拷贝的属性,例如一个类我只想复制其父类的一些属性,就可以将editable设置为父类
* 2、是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null
* 3、忽略的属性列表,设置一个属性列表,不拷贝这些属性值
* * @author Looly */ public static class CopyOptions { /** 限制的类或接口,必须为目标对象的实现接口或父类,用于限制拷贝的属性,例如一个类我只想复制其父类的一些属性,就可以将editable设置为父类 */ private Class editable; /** 是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null */ private boolean isIgnoreNullValue; /** 忽略的属性列表,设置一个属性列表,不拷贝这些属性值 */ private String[] ignoreProperties; /** 是否忽略字段注入错误 */ private boolean isIgnoreError; /** * 创建拷贝选项 * @return 拷贝选项 */ public static CopyOptions create(){ return new CopyOptions(); } /** * 创建拷贝选项 * @param editable 限制的类或接口,必须为目标对象的实现接口或父类,用于限制拷贝的属性 * @param isIgnoreNullValue 是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null * @param ignoreProperties 忽略的属性列表,设置一个属性列表,不拷贝这些属性值 * @return 拷贝选项 */ public static CopyOptions create(Class editable, boolean isIgnoreNullValue, String... ignoreProperties){ return new CopyOptions(editable, isIgnoreNullValue, ignoreProperties); } /** * 构造拷贝选项 */ public CopyOptions() { } /** * 构造拷贝选项 * @param editable 限制的类或接口,必须为目标对象的实现接口或父类,用于限制拷贝的属性 * @param isIgnoreNullValue 是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null * @param ignoreProperties 忽略的属性列表,设置一个属性列表,不拷贝这些属性值 */ public CopyOptions(Class editable, boolean isIgnoreNullValue, String... ignoreProperties) { this.editable = editable; this.isIgnoreNullValue = isIgnoreNullValue; this.ignoreProperties = ignoreProperties; } /** * 设置限制的类或接口,必须为目标对象的实现接口或父类,用于限制拷贝的属性 * @param editable 限制的类或接口 * @return CopyOptions */ public CopyOptions setEditable(Class editable){ this.editable = editable; return this; } /** * 设置是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null * @param isIgnoreNullVall 是否忽略空值,当源对象的值为null时,true: 忽略而不注入此值,false: 注入null * @return CopyOptions */ public CopyOptions setIgnoreNullValue(boolean isIgnoreNullVall){ this.isIgnoreNullValue = isIgnoreNullVall; return this; } /** * 设置忽略的属性列表,设置一个属性列表,不拷贝这些属性值 * @param ignoreProperties 忽略的属性列表,设置一个属性列表,不拷贝这些属性值 * @return CopyOptions */ public CopyOptions setIgnoreProperties(String... ignoreProperties){ this.ignoreProperties = ignoreProperties; return this; } /** * 设置是否忽略字段的注入错误 * @param isIgnoreError 是否忽略 */ public void setIgnoreError(boolean isIgnoreError) { this.isIgnoreError = isIgnoreError; } } }




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