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; /** * 项目名称:JavaBean与Map对象互相转化 * 类名称:BeanMapUtil.java * 类描述: * 创建人:beyond * 创建时间:2016-5-11 下午4:03:07 * 修改人: * 修改时间: * 修改备注: * @version */ public class BeanMapUtil { public static void main(String[] args) throws IntrospectionException, IllegalAccessException, InstantiationException, InvocationTargetException { User user = new User(); user.setAge(1); user.setId(2); @SuppressWarnings("unchecked") Map<String, Integer> map = BeanMapUtil.convertBean(user); for (Object o : map.keySet()) { System.out.println(o + "," + map.get(o)); } // Map map = new HashMap(); // map.put("id", 1); // map.put("age", 21); // User user = new User(); // user = (User) convertMap(User.class, map); // System.err.println(user.getAge()); } /** * 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 */ @SuppressWarnings("rawtypes") public static Object convertMap(Class type, Map map) throws IntrospectionException, IllegalAccessException, InstantiationException, InvocationTargetException { BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性 Object obj = type.newInstance(); // 创建 JavaBean 对象 // 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; descriptor.getWriteMethod().invoke(obj, args); } } 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 */ @SuppressWarnings({ "rawtypes", "unchecked" }) public static Map convertBean(Object bean) throws IntrospectionException, IllegalAccessException, InvocationTargetException { Class type = bean.getClass(); Map returnMap = new HashMap(); BeanInfo beanInfo = Introspector.getBeanInfo(type); PropertyDescriptor[] propertyDescriptors = beanInfo .getPropertyDescriptors(); for (int i = 0; i < propertyDescriptors.length; i++) { PropertyDescriptor descriptor = propertyDescriptors[i]; String propertyName = descriptor.getName(); if (!propertyName.equals("class")) { Method readMethod = descriptor.getReadMethod(); Object result = readMethod.invoke(bean, new Object[0]); if (result != null) { returnMap.put(propertyName, result); } else { returnMap.put(propertyName, ""); } } } return returnMap; } } class User { private int id; private int age; public int getId() { return id; } public void setId(int id) { this.id = id; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
JavaBean与Map对象互相转化
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转载自bugyun.iteye.com/blog/2297487
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