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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.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import com.xiaoleilu.hutool.bean.BeanInfoCache;
import com.xiaoleilu.hutool.bean.BeanResolver;
import com.xiaoleilu.hutool.bean.DynaBean;
import com.xiaoleilu.hutool.collection.CaseInsensitiveMap;
import com.xiaoleilu.hutool.convert.Convert;
import com.xiaoleilu.hutool.exceptions.UtilException;

/**
 * Bean工具类
 * 
 * 

把一个拥有对属性进行set和get方法的类,我们就可以称之为JavaBean。

* * @author Looly * */ public final class BeanUtil { private BeanUtil() {} /** * 判断是否为Bean对象
* 判定方法是是否存在只有一个参数的setXXX方法 * @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; } /** * 创建动态Bean * * @param bean 普通Bean或Map * @return {@link DynaBean} * @since 3.0.7 */ public static DynaBean createDynaBean(Object bean){ return new DynaBean(bean); } /** * 查找类型转换器 {@link PropertyEditor} * @param type 需要转换的目标类型 * @return {@link PropertyEditor} */ public static PropertyEditor findEditor(Class type){ return PropertyEditorManager.findEditor(type); } //--------------------------------------------------------------------------------------------------------- PropertyDescriptor /** * 获得Bean字段描述数组 * * @param clazz Bean类 * @return 字段描述数组 * @throws IntrospectionException 获取属性异常 */ public static PropertyDescriptor[] getPropertyDescriptors(Class clazz) throws IntrospectionException { return Introspector.getBeanInfo(clazz).getPropertyDescriptors(); } /** * 获得字段名和字段描述Map,获得的结果会缓存在 {@link BeanInfoCache}中 * @param clazz Bean类 * @param ignoreCase 是否忽略大小写 * @return 字段名和字段描述Map * @throws IntrospectionException 获取属性异常 */ public static Map getPropertyDescriptorMap(Class clazz, boolean ignoreCase) throws IntrospectionException{ Map map = BeanInfoCache.INSTANCE.getPropertyDescriptorMap(clazz, ignoreCase); if(null == map){ map = internalGetPropertyDescriptorMap(clazz, ignoreCase); BeanInfoCache.INSTANCE.putPropertyDescriptorMap(clazz, map, ignoreCase); } return map; } /** * 获得字段名和字段描述Map。内部使用,直接获取Bean类的PropertyDescriptor * @param clazz Bean类 * @param ignoreCase 是否忽略大小写 * @return 字段名和字段描述Map * @throws IntrospectionException 获取属性异常 */ private static Map internalGetPropertyDescriptorMap(Class clazz, boolean ignoreCase) throws IntrospectionException{ final PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(clazz); final Map map = ignoreCase ? new CaseInsensitiveMap(propertyDescriptors.length, 1) : new HashMap((int) (propertyDescriptors.length), 1); for (PropertyDescriptor propertyDescriptor : propertyDescriptors) { map.put(propertyDescriptor.getName(), propertyDescriptor); } return map; } /** * 获得Bean类属性描述,大小写敏感 * * @param clazz Bean类 * @param fieldName 字段名 * @return PropertyDescriptor * @throws IntrospectionException 获取属性异常 */ public static PropertyDescriptor getPropertyDescriptor(Class clazz, final String fieldName) throws IntrospectionException { return getPropertyDescriptor(clazz, fieldName, false); } /** * 获得Bean类属性描述 * * @param clazz Bean类 * @param fieldName 字段名 * @param ignoreCase 是否忽略大小写 * @return PropertyDescriptor * @throws IntrospectionException 获取属性异常 */ public static PropertyDescriptor getPropertyDescriptor(Class clazz, final String fieldName, boolean ignoreCase) throws IntrospectionException { final Map map = getPropertyDescriptorMap(clazz, ignoreCase); return (null == map) ? null : map.get(fieldName); } /** * 获得字段值,通过反射直接获得字段值,并不调用getXXX方法
* 对象同样支持Map类型,fieldName即为key * * @param bean Bean对象 * @param fieldName 字段名 * @return 字段值 */ public static Object getFieldValue(Object bean, String fieldName){ if(null == bean || StrUtil.isBlank(fieldName)){ return null; } if(bean instanceof Map){ return ((Map)bean).get(fieldName); }else if(bean instanceof List){ return ((List)bean).get(Integer.parseInt(fieldName)); }else if(bean instanceof Collection){ return ((Collection)bean).toArray()[Integer.parseInt(fieldName)]; }else if(ArrayUtil.isArray(bean)){ return Array.get(bean, Integer.parseInt(fieldName)); }else{//普通Bean对象 Field field; try { field = ClassUtil.getDeclaredField(bean.getClass(), fieldName); if(null != field){ field.setAccessible(true); return field.get(bean); } } catch (Exception e) { throw new UtilException(e); } } return null; } /** * 解析Bean中的属性值 * @param bean Bean对象,支持Map、List、Collection、Array * @param expression 表达式,例如:person.friend[5].name * @return Bean属性值 * @see BeanResolver#resolveBean(Object, String) * @since 3.0.7 */ public static Object getProperty(Object bean, String expression){ return BeanResolver.resolveBean(bean, expression); } //--------------------------------------------------------------------------------------------- mapToBean /** * Map转换为Bean对象 * * @param Bean类型 * @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 Bean类型 * @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); } //--------------------------------------------------------------------------------------------- fillBeanWithMap /** * 使用Map填充Bean对象 * * @param Bean类型 * @param map Map * @param bean Bean * @param copyOptions 属性复制选项 {@link CopyOptions} * @return Bean */ public static T fillBeanWithMap(final Map map, T bean, CopyOptions copyOptions) { return fillBean(bean, new ValueProvider(){ @Override public Object value(String key, Class valueType) { return map.get(key); } @Override public boolean containsKey(String key) { return map.containsKey(key); } }, copyOptions); } /** * 使用Map填充Bean对象 * * @param Bean类型 * @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 fillBeanWithMap(map, bean, CopyOptions.create().setIgnoreError(isIgnoreError)); } /** * 使用Map填充Bean对象,可配置将下划线转换为驼峰 * * @param Bean类型 * @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); }else{ return fillBeanWithMap(map, bean, isIgnoreError); } } /** * 使用Map填充Bean对象,忽略大小写 * * @param Bean类型 * @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) { return fillBeanWithMap(new CaseInsensitiveMap<>(map), bean, isIgnoreError); } //--------------------------------------------------------------------------------------------- fillBeanWithRequestParam /** * ServletRequest 参数转Bean * * @param Bean类型 * @param request ServletRequest * @param bean Bean * @param copyOptions 注入时的设置 * @return Bean * @since 3.0.4 */ public static T fillBeanWithRequestParam(final javax.servlet.ServletRequest request, T bean, CopyOptions copyOptions) { final String beanName = StrUtil.lowerFirst(bean.getClass().getSimpleName()); return fillBean(bean, new ValueProvider(){ @Override public Object value(String key, Class valueType) { String value = request.getParameter(key); if (StrUtil.isEmpty(value)) { // 使用类名前缀尝试查找值 value = request.getParameter(beanName + StrUtil.DOT + key); 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 containsKey(String key) { //对于Servlet来说,返回值null意味着无此参数 return null != request.getParameter(key); } }, copyOptions); } /** * ServletRequest 参数转Bean * * @param Bean类型 * @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) { return fillBeanWithRequestParam(request, bean, CopyOptions.create().setIgnoreError(isIgnoreError)); } /** * ServletRequest 参数转Bean * * @param Bean类型 * @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); } //--------------------------------------------------------------------------------------------- fillBean /** * ServletRequest 参数转Bean * * @param Bean类型 * @param beanClass Bean Class * @param valueProvider 值提供者 * @param copyOptions 拷贝选项,见 {@link CopyOptions} * @return Bean */ public static T toBean(Class beanClass, ValueProvider valueProvider, CopyOptions copyOptions) { return fillBean(ClassUtil.newInstance(beanClass), valueProvider, copyOptions); } /** * 填充Bean的核心方法 * * @param Bean类型 * @param bean Bean * @param valueProvider 值提供者 * @param copyOptions 拷贝选项,见 {@link CopyOptions} * @return Bean */ public static T fillBean(T bean, ValueProvider valueProvider, CopyOptions copyOptions) { if (null == valueProvider) { return bean; } Class actualEditable = bean.getClass(); if (copyOptions.editable != null) { //检查限制类是否为target的父类或接口 if (!copyOptions.editable.isInstance(bean)) { throw new IllegalArgumentException(StrUtil.format("Target class [{}] not assignable to Editable class [{}]", bean.getClass().getName(), copyOptions.editable.getName())); } actualEditable = copyOptions.editable; } HashSet ignoreSet = copyOptions.ignoreProperties != null ? CollectionUtil.newHashSet(copyOptions.ignoreProperties) : null; try { final PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(actualEditable); String propertyName; Class propertyType; Object value; for (PropertyDescriptor property : propertyDescriptors) { propertyName = property.getName(); if((null != ignoreSet && ignoreSet.contains(propertyName)) || false == valueProvider.containsKey(propertyName)){ continue;//属性值被忽略或值提供者无此key时跳过 } propertyType = property.getPropertyType(); value = valueProvider.value(propertyName, propertyType); if (null == value && copyOptions.ignoreNullValue) { continue;//当允许跳过空时,跳过 } try { //当类型不匹配的时候,执行默认转换 if(false == propertyType.isInstance(value)){ value = Convert.convert(propertyType, value); if (null == value && copyOptions.ignoreNullValue) { continue;//当允许跳过空时,跳过 } } // property.getWriteMethod().invoke(bean, value); Method method = ClassUtil.setAccessible(property.getWriteMethod()); if(null != method){ method.invoke(bean, value); } } catch (Exception e) { if(copyOptions.ignoreError){ continue;//忽略注入失败 }else{ throw new UtilException(e, "Inject [{}] error!", property.getName()); } } } } catch (Exception e) { throw new UtilException(e); } return bean; } //--------------------------------------------------------------------------------------------- beanToMap /** * 对象转Map,不进行驼峰转下划线,不忽略值为空的字段 * * @param Bean类型 * @param bean bean对象 * @return Map */ public static Map beanToMap(T bean) { return beanToMap(bean, false, false); } /** * 对象转Map * * @param Bean类型 * @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") && false == key.equals("declaringClass")) { // 得到property对应的getter方法 Method getter = property.getReadMethod(); Object value = getter.invoke(bean); if (false == ignoreNullValue || (null != value && false == value.equals(bean))) { map.put(isToUnderlineCase ? StrUtil.toUnderlineCase(key) : key, value); } } } } catch (Exception e) { throw new UtilException(e); } return map; } //--------------------------------------------------------------------------------------------- copyProperties /** * 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(final Object source, Object target, CopyOptions copyOptions) { copyProperties(source, target, false, copyOptions); } /** * 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 ignoreCase 是否忽略大小写 * @param copyOptions 拷贝选项,见 {@link CopyOptions} */ public static void copyProperties(final Object source, Object target, boolean ignoreCase, CopyOptions copyOptions) { if(null == copyOptions){ copyOptions = new CopyOptions(); } final boolean ignoreError = copyOptions.ignoreError; final Map sourcePdMap; try { sourcePdMap = getPropertyDescriptorMap(source.getClass(), ignoreCase); } catch (IntrospectionException e) { throw new UtilException(e); } fillBean(target, new ValueProvider(){ @Override public Object value(String key, Class valueType) { PropertyDescriptor sourcePd = sourcePdMap.get(key); Method readMethod = sourcePd.getReadMethod(); if (readMethod != null && ClassUtil.isAssignable(valueType, readMethod.getReturnType())) { try { return ClassUtil.setAccessible(readMethod).invoke(source); } catch (Exception e) { if(false == ignoreError){ throw new UtilException(e, "Inject [{}] error!", key); } } } return null; } @Override public boolean containsKey(String key) { return sourcePdMap.containsKey(key); } }, copyOptions); } /** * 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 * @param KEY类型,一般情况下为 {@link String} * */ public static interface ValueProvider{ /** * 获取值
* 返回值一般需要匹配被注入类型,如果不匹配会调用默认转换 {@link Convert#convert(Class, Object)}实现转换 * * @param key Bean对象中参数名 * @param valueType 被注入的值得类型 * @return 对应参数名的值 */ public Object value(T key, Class valueType); /** * 是否包含指定KEY,如果不包含则忽略注入 * @param key Bean对象中参数名 * @return 是否包含指定KEY */ public boolean containsKey(T key); } //-------------------------------------------------------------------------------------------------------------------------------------- /** * 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 ignoreNullValue; /** 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 ignoreError; /** * 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 ignoreNullValue 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 ignoreNullValue, String... ignoreProperties){ return new CopyOptions(editable, ignoreNullValue, 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 ignoreNullValue 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 ignoreNullValue, String... ignoreProperties) { this.editable = editable; this.ignoreNullValue = ignoreNullValue; 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 ignoreNullVall 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 ignoreNullVall){ this.ignoreNullValue = ignoreNullVall; 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 ignoreError 是否忽略 * @return CopyOptions */ public CopyOptions setIgnoreError(boolean ignoreError) { this.ignoreError = ignoreError; return this; } } }




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