package com.tzj.utils;import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class BeanToMapUtils {private final static Logger logger = LoggerFactory.getLogger(BeanToMapUtils.class);/*** 将一个 Map 对象转化为一个 JavaBean* * @param type*            要转化的类型* @param map*            包含属性值的 map* @return 转化出来的 JavaBean 对象* @throws IntrospectionException*             如果分析类属性失败* @throws IllegalAccessException*             如果实例化 JavaBean 失败* @throws InstantiationException*             如果实例化 JavaBean 失败* @throws InvocationTargetException*             如果调用属性的 setter 方法失败*/public static Object convertMap(Class<?> type, Map<?, ?> map) {BeanInfo beanInfo = null;try {beanInfo = Introspector.getBeanInfo(type);} catch (IntrospectionException e) {logger.error("分析类属性失败");e.printStackTrace();} // 获取类属性Object obj = null;try { // 创建 JavaBean 对象obj = type.newInstance();} catch (InstantiationException | IllegalAccessException e) {logger.error("实例化 JavaBean 失败");e.printStackTrace();}// 给 JavaBean 对象的属性赋值PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();for (int i = 0; i < propertyDescriptors.length; i++) {PropertyDescriptor descriptor = propertyDescriptors[i];String propertyName = descriptor.getName();if (map.containsKey(propertyName)) {// 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。Object value = map.get(propertyName);Object[] args = new Object[1];args[0] = value;try {descriptor.getWriteMethod().invoke(obj, args);} catch (IllegalAccessException | IllegalArgumentException e) {logger.error("实例化 JavaBean 失败");e.printStackTrace();} catch (InvocationTargetException e) {logger.error("调用属性的 setter 方法失败");e.printStackTrace();}}}return obj;}/*** 将一个 JavaBean 对象转化为一个 Map* * @param bean*            要转化的JavaBean 对象* @return 转化出来的 Map 对象* @throws IntrospectionException*             如果分析类属性失败* @throws IllegalAccessException*             如果实例化 JavaBean 失败* @throws InvocationTargetException*             如果调用属性的 setter 方法失败*/public static Map<String, Object> convertBean(Object bean) {Class<? extends Object> type = bean.getClass();Map<String, Object> returnMap = new HashMap<String, Object>();BeanInfo beanInfo = null;try {beanInfo = Introspector.getBeanInfo(type);} catch (IntrospectionException e) {logger.error("分析类属性失败");e.printStackTrace();return returnMap;}PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();for (PropertyDescriptor descriptor : propertyDescriptors) {String propertyName = descriptor.getName();if (!propertyName.equals("class")) {Method readMethod = descriptor.getReadMethod();System.err.println(propertyName);Object result = null;try {result = readMethod.invoke(bean, new Object[0]);} catch (IllegalAccessException | IllegalArgumentException e) {logger.error("实例化 JavaBean 失败");e.printStackTrace();} catch (InvocationTargetException e) {logger.error("调用属性的 setter 方法");e.printStackTrace();}if (propertyName.equals("entity") && result != null) {returnMap.putAll(convertBean(result));} else {returnMap.put(propertyName, result);}}}return returnMap;}
}