84 lines
3.3 KiB
Java
84 lines
3.3 KiB
Java
package com.fuint.utils;
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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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/**
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* Created by FSQ
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* CopyRight https://www.fuint.cn
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*/
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public class BeanToMapUtil {
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/**
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* 将一个 Map 对象转化为一个 JavaBean
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*
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* @param type 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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public static Object convertMap(Class type, Map map)
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throws IntrospectionException, IllegalAccessException,
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InstantiationException, InvocationTargetException {
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BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
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Object obj = type.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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Object[] args = new Object[1];
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args[0] = value;
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descriptor.getWriteMethod().invoke(obj, args);
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}
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}
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return 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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*
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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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public static Map convertBean(Object bean) throws IntrospectionException, IllegalAccessException, InvocationTargetException {
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Class type = bean.getClass();
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Map returnMap = new HashMap();
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BeanInfo beanInfo = Introspector.getBeanInfo(type);
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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 = readMethod.invoke(bean, new Object[0]);
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if (result != null) {
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returnMap.put(propertyName, result);
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} else {
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returnMap.put(propertyName, "");
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}
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}
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}
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return returnMap;
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}
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}
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