怎么实现相同结构不同类的对象快速复制数据？

如何实现相同结构不同类的对象快速复制数据？？？
简单说就是class A和class B的结构一致，a为A的实例，b为B的实例，其中a有数据，我新建的b，想b得到和a一样的数据，如何快速实现?

[解决办法]
commons-beanutils 包中的BeanUtils.copyProperties()属性拷贝
[解决办法]
apache项目中有个beanUtil就是专门用于这方面的。你可以参见
http://commons.apache.org/beanutils/
[解决办法]

Java code

import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.Modifier;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.apache.commons.lang.StringUtils;import org.apache.log4j.Logger;import com.X.common.classtool.selector.BlankStringSelector;import com.X.common.classtool.selector.FieldSelectorI;import com.X.common.classtool.selector.NullSelector;/** * 类复制工具 * 2007-12-08 */public class ClassCopyUtils {    private static final Logger log = Logger.getLogger(ClassCopyUtils.class);    private List<FieldSelectorI> selectorList = new ArrayList<FieldSelectorI>(1);        public ClassCopyUtils() {        //默认选择非空的属性        addSelector(new NullSelector(false));    }        public void copy(Object source, Object dest) {        if (source == null || dest == null) {            log.error("空值不能进行属性复制!");            throw new RuntimeException("传入的要复制对象为空!");        }        String fieldOrignStr = null;        String fieldName = null;        Field destField = null;                Method[] sourcrMethods = source.getClass().getDeclaredMethods();        for (Method sourceMethod : sourcrMethods) {            //必须是程序能正常访问到的属性 public Object getXXX()            if (sourceMethod.getName().startsWith("get")&&Modifier.isPublic(sourceMethod.getModifiers())&&sourceMethod.getParameterTypes().length==0) {                try {                    Object value = sourceMethod.invoke(source, new Object[] {});                                        boolean include = true;                    for (FieldSelectorI selector : selectorList) {                        if (!selector.include(value, null)) {                            include = false;                            break;                        }                    }                                        if (include) {                        try {                            //如果是代理类只能用方法赋值                            if (dest.getClass().getSimpleName().indexOf("$")!=-1) {                                Method destMethod = null;                                if (value instanceof Date) {                                    try {                                        destMethod = dest.getClass().getMethod(                                                StringUtils.replaceOnce(sourceMethod.getName(), "get", "set"),                                                value.getClass());                                        destMethod.setAccessible(true);                                        destMethod.invoke(dest, value);                                    } catch (NoSuchMethodException e) {                                        destMethod = dest.getClass().getMethod(                                                StringUtils.replaceOnce(sourceMethod.getName(), "get", "set"),                                                java.sql.Timestamp.class);                                        destMethod.setAccessible(true);                                        destMethod.invoke(dest, value);                                    }                                }else{                                    destMethod = dest.getClass().getMethod(                                            StringUtils.replaceOnce(sourceMethod.getName(), "get", "set"),                                            value.getClass());                                    destMethod.setAccessible(true);                                    destMethod.invoke(dest, value);                                }                                log.debug("代理类方法"+destMethod.getName() + "成功");                            } else {                                fieldOrignStr = sourceMethod.getName().substring(3);                                fieldName = fieldOrignStr.substring(0, 1).toLowerCase() + fieldOrignStr.substring(1);                                destField = dest.getClass().getDeclaredField(fieldName);                                destField.setAccessible(true);                                destField.set(dest, value);                                log.debug(fieldName + "赋值成功");                            }                        } catch (SecurityException e) {                            log.info("方法"+StringUtils.replaceOnce(sourceMethod.getName(), "get", "set")+"导致一个安全异常:"+e.getMessage());                        }                    }                } catch (IllegalArgumentException e) {                    e.printStackTrace();                } catch (IllegalAccessException e) {                    log.error("目标不具有访问性"+e.getMessage());                } catch (InvocationTargetException e) {                    log.error("方法调用出现异常:"+e.getMessage());                } catch (NoSuchFieldException e) {                    log.error("赋值出现异常,没有这个属性:"+fieldName);                } catch (NoSuchMethodException e) {                    log.error("方法调用出现异常:"+e.getMessage());                }            }        }    }        public void includeBlankString(boolean include){        addSelector(new BlankStringSelector(include));    }    public void addSelector(FieldSelectorI selector) {        this.selectorList.add(selector);    }}