实现BeanUtils类的两个copyProperty方法（我是初学者，见笑了）
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- Java code
看吧： public void copyProperties(Object dest, Object orig) throws IllegalAccessException, InvocationTargetException { if(dest == null) throw new IllegalArgumentException("No destination bean specified"); if(orig == null) throw new IllegalArgumentException("No origin bean specified"); if(log.isDebugEnabled()) log.debug("BeanUtils.copyProperties(" + dest + ", " + orig + ")"); if(orig instanceof DynaBean) { DynaProperty origDescriptors[] = ((DynaBean)orig).getDynaClass().getDynaProperties(); for(int i = 0; i < origDescriptors.length; i++) { String name = origDescriptors[i].getName(); if(getPropertyUtils().isWriteable(dest, name)) { Object value = ((DynaBean)orig).get(name); copyProperty(dest, name, value); } } } else if(orig instanceof Map) { for(Iterator names = ((Map)orig).keySet().iterator(); names.hasNext();) { String name = (String)names.next(); if(getPropertyUtils().isWriteable(dest, name)) { Object value = ((Map)orig).get(name); copyProperty(dest, name, value); } } } else { PropertyDescriptor origDescriptors[] = getPropertyUtils().getPropertyDescriptors(orig); for(int i = 0; i < origDescriptors.length; i++) { String name = origDescriptors[i].getName(); if(!"class".equals(name) && getPropertyUtils().isReadable(orig, name) && getPropertyUtils().isWriteable(dest, name)) try { Object value = getPropertyUtils().getSimpleProperty(orig, name); copyProperty(dest, name, value); } catch(NoSuchMethodException e) { } } } } public void copyProperty(Object bean, String name, Object value) throws IllegalAccessException, InvocationTargetException { if(log.isTraceEnabled()) { StringBuffer sb = new StringBuffer(" copyProperty("); sb.append(bean); sb.append(", "); sb.append(name); sb.append(", "); if(value == null) sb.append("<NULL>"); else if(value instanceof String) sb.append((String)value); else if(value instanceof String[]) { String values[] = (String[])value; sb.append('['); for(int i = 0; i < values.length; i++) { if(i > 0) sb.append(','); sb.append(values[i]); } sb.append(']'); } else { sb.append(value.toString()); } sb.append(')'); log.trace(sb.toString()); } Object target = bean; int delim = name.lastIndexOf('.'); if(delim >= 0) { try { target = getPropertyUtils().getProperty(bean, name.substring(0, delim)); } catch(NoSuchMethodException e) { return; } name = name.substring(delim + 1); if(log.isTraceEnabled()) { log.trace(" Target bean = " + target); log.trace(" Target name = " + name); } } String propName = null; Class type = null; int index = -1; String key = null; propName = name; int i = propName.indexOf('['); if(i >= 0) { int k = propName.indexOf(']'); try { index = Integer.parseInt(propName.substring(i + 1, k)); } catch(NumberFormatException e) { } propName = propName.substring(0, i); } int j = propName.indexOf('('); if(j >= 0) { int k = propName.indexOf(')'); try { key = propName.substring(j + 1, k); } catch(IndexOutOfBoundsException e) { } propName = propName.substring(0, j); } if(target instanceof DynaBean) { DynaClass dynaClass = ((DynaBean)target).getDynaClass(); DynaProperty dynaProperty = dynaClass.getDynaProperty(propName); if(dynaProperty == null) return; type = dynaProperty.getType(); } else { PropertyDescriptor descriptor = null; try { descriptor = getPropertyUtils().getPropertyDescriptor(target, name); if(descriptor == null) return; } catch(NoSuchMethodException e) { return; } type = descriptor.getPropertyType(); if(type == null) { if(log.isTraceEnabled()) log.trace(" target type for property '" + propName + "' is null, so skipping ths setter"); return; } } if(log.isTraceEnabled()) log.trace(" target propName=" + propName + ", type=" + type + ", index=" + index + ", key=" + key); if(index >= 0) { Converter converter = getConvertUtils().lookup(type.getComponentType()); if(converter != null) { log.trace(" USING CONVERTER " + converter); value = converter.convert(type, value); } try { getPropertyUtils().setIndexedProperty(target, propName, index, value); } catch(NoSuchMethodException e) { throw new InvocationTargetException(e, "Cannot set " + propName); } } else if(key != null) { try { getPropertyUtils().setMappedProperty(target, propName, key, value); } catch(NoSuchMethodException e) { throw new InvocationTargetException(e, "Cannot set " + propName); } } else { Converter converter = getConvertUtils().lookup(type); if(converter != null) { log.trace(" USING CONVERTER " + converter); value = converter.convert(type, value); } try { getPropertyUtils().setSimpleProperty(target, propName, value); } catch(NoSuchMethodException e) { throw new InvocationTargetException(e, "Cannot set " + propName); } } }