import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;public class PropertyUtil {private static final String SET_PREFIX = "set";private static final String IS_PREFIX = "is";private static final String GET_PREFIX = "get";public static PropertyDescriptor getPropertyDescriptor(Class<?> clazz, String propertyName) {//根据需求，定制 自己的get和set方法Method setMethod = null;Method getMethod = null;PropertyDescriptor pd = null;try {Field field = clazz.getDeclaredField(propertyName);// 根据字段名来获取字段if (field != null) {// 构建方法的后缀String methodEnd = propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);setMethod = clazz.getDeclaredMethod(SET_PREFIX + methodEnd, new Class[] { field.getType() });// 构建get 方法getMethod = clazz.getDeclaredMethod(GET_PREFIX + methodEnd, new Class[] {});// 构建一个属性描述器 把对应属性 propertyName 的 get 和 set 方法保存到属性描述器中pd = new PropertyDescriptor(propertyName, getMethod, setMethod);}} catch (Exception ex) {ex.printStackTrace();}return pd;}public static PropertyDescriptor getPropertyDescriptor2(Class<?> clazz, String propertyName) {//使用 PropertyDescriptor 提供的 get和set方法try {return new PropertyDescriptor(propertyName, clazz);} catch (IntrospectionException e) {e.printStackTrace();}return null;}public static void setProperty(Object obj, String propertyName, Object value) {Class<?> clazz = obj.getClass();// 获取对象的类型PropertyDescriptor pd = getPropertyDescriptor(clazz, propertyName);// 获取// clazz// 类型中的// propertyName// 的属性描述器Method setMethod = pd.getWriteMethod();// 从属性描述器中获取 set 方法try {setMethod.invoke(obj, new Object[] { value });// 调用 set// 方法将传入的value值保存属性中去} catch (Exception e) {e.printStackTrace();}}public static Object getProperty(Object obj, String propertyName) {Class<?> clazz = obj.getClass();// 获取对象的类型PropertyDescriptor pd = getPropertyDescriptor(clazz, propertyName);// 获取// clazz// 类型中的// propertyName// 的属性描述器Method getMethod = pd.getReadMethod();// 从属性描述器中获取 get 方法Object value = null;try {value = getMethod.invoke(clazz, new Object[] {});// 调用方法获取方法的返回值} catch (Exception e) {e.printStackTrace();}return value;// 返回值
    }}