package com.fgkj.actions;
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import java.beans.BeanInfo;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.TreeMap;
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public class BeanToMapUtils {
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/**
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* 将一个 Map 对象转化为一个 JavaBean
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* @param clazz 要转化的类型
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* @param map 包含属性值的 map
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* @return 转化出来的 JavaBean 对象
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* @throws IntrospectionException 如果分析类属性失败
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* @throws IllegalAccessException 如果实例化 JavaBean 失败
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* @throws InstantiationException 如果实例化 JavaBean 失败
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* @throws InvocationTargetException 如果调用属性的 setter 方法失败
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*/
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@SuppressWarnings("rawtypes")
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public static <T> T toBean(Class<T> clazz, Map map) {
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T obj = null;
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try {
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BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
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obj = clazz.newInstance(); // 创建 JavaBean 对象
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// 给 JavaBean 对象的属性赋值
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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for (int i = 0; i < propertyDescriptors.length; i++) {
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PropertyDescriptor descriptor = propertyDescriptors[i];
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String propertyName = descriptor.getName();
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if (map.containsKey(propertyName)) {
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// 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。
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Object value = map.get(propertyName);
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if ("".equals(value)) {
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value = null;
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}
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Object[] args = new Object[1];
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args[0] = value;
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try {
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descriptor.getWriteMethod().invoke(obj, args);
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} catch (InvocationTargetException e) {
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System.out.println("字段映射失败");
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}
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}
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}
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} catch (IllegalAccessException e) {
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System.out.println("实例化 JavaBean 失败");
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} catch (IntrospectionException e) {
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System.out.println("分析类属性失败");
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} catch (IllegalArgumentException e) {
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System.out.println("映射错误");
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} catch (InstantiationException e) {
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System.out.println("实例化 JavaBean 失败");
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}
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return (T) obj;
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}
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/**
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* 将一个 JavaBean 对象转化为一个 Map
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* @param bean 要转化的JavaBean 对象
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* @return 转化出来的 Map 对象
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* @throws IntrospectionException 如果分析类属性失败
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* @throws IllegalAccessException 如果实例化 JavaBean 失败
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* @throws InvocationTargetException 如果调用属性的 setter 方法失败
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*/
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@SuppressWarnings("rawtypes")
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public static Map toMap(Object bean) {
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Class<? extends Object> clazz = bean.getClass();
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Map<Object, Object> returnMap = new HashMap<Object, Object>();
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BeanInfo beanInfo = null;
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try {
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beanInfo = Introspector.getBeanInfo(clazz);
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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for (int i = 0; i < propertyDescriptors.length; i++) {
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PropertyDescriptor descriptor = propertyDescriptors[i];
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String propertyName = descriptor.getName();
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if (!propertyName.equals("class")) {
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Method readMethod = descriptor.getReadMethod();
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Object result = null;
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result = readMethod.invoke(bean, new Object[0]);
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if (null != propertyName) {
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propertyName = propertyName.toString();
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}
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if (null != result) {
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result = result.toString();
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}
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returnMap.put(propertyName, result);
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}
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}
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} catch (IntrospectionException e) {
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System.out.println("分析类属性失败");
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} catch (IllegalAccessException e) {
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System.out.println("实例化 JavaBean 失败");
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} catch (IllegalArgumentException e) {
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System.out.println("映射错误");
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} catch (InvocationTargetException e) {
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System.out.println("调用属性的 setter 方法失败");
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}
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return returnMap;
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}
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public static void main(String[] args) {
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}
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}
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