懒惰型（左优先）的from表单填充（相对于struts的右优先填充） StrutsF#J#ServletC

 

	/**
	 * 普通的写法，如:
	 * <tb:code type="CODE_DevJobGrade" name="criterionForm" required="true"  property="criterions.jobGrade" elementWidth="150" value="0"/>
	 * <tb:code type="CODE_DevJobGrade" name="criterionForm" required="true"  property="criterions.jobGrade" elementWidth="150" value="0"/>
	 * 其中的两个 property="criterions.jobGrade" 会被struct解释为属性criterions的字符串JobGrade数组。<br/>
	 * 但是有些时候会需要解释为criterions的数组，值保持到criterion[0]的jobGrade属性中.
	 * so here it is.
	 * @param form
	 * @param request
	 * @return
	 * @author hite
	 * @throws NoSuchMethodException 
	 * @throws InvocationTargetException 
	 * @throws IllegalAccessException 
	 * @throws InstantiationException 
	 * @throws SecurityException 
	 * @throws IllegalArgumentException 
	 * @date 2009-12-21下午02:16:03
	 * @since 1.0.0
	 */
	public static boolean lazyPopulateForm(ActionForm form, HttpServletRequest request) throws IllegalArgumentException, SecurityException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		//先循环反射，再循环变量
		//HiteFix 应该做出迭代的
		HashMap args = new HashMap();
		for (Enumeration e = request.getParameterNames();e.hasMoreElements();){
			 String key = (String)e.nextElement();
			 String[] keys =key.split("\\.");
			 if (keys.length>1) {
				if (args.containsKey(keys[0])) {
					List kv = (List) args.get(keys[0]);
					kv.add(keys[1]);
					args.put(keys[0],kv);
				} else {
					List kv = new ArrayList();
					kv.add(keys[1]);
					args.put(keys[0],kv);
				}
			}
		}
		
		 Class c=form.getClass();   
		 Field []fs=c.getDeclaredFields();   

		 for(int i=0;i<fs.length;i++){   
		   Field f=fs[i]; 
		   String voArrayName = f.getName();
		   if(args.containsKey(voArrayName)){
			   f.setAccessible(true);
			   Class type = f.get(form).getClass();
			   if(type.isArray()){
				   List subArgs = (List)args.get(voArrayName);
				   if(subArgs.size()>0){
					   Class componentType = type.getComponentType();
					   String[] values = request.getParameterValues(voArrayName+"."+subArgs.get(0).toString());
					   //VO Array
					   Object[] filledArray = (Object[])Array.newInstance(componentType, values.length);
					   //TODO to VO
					   
						for (int k = 0; k < filledArray.length; k++) {
							Object singleVO = filledArray[k];
							if (singleVO == null) {
								singleVO = componentType.getConstructor(null).newInstance(null);
							}
							Field[] svFields = singleVO.getClass().getDeclaredFields();
							for (int j = 0; j < svFields.length; j++) {
								Field svField = svFields[j];
								String svFieldName = svField.getName();
								if (subArgs.contains(svFieldName)) {
									svField.setAccessible(true);
									Method method;
									String currentArgValue = request.getParameterValues(voArrayName + "." + svFieldName)[k];
									if (currentArgValue.length()>0) {//not fill if null or empty
										try {
											Object svFieldValue = svField.get(singleVO);
											if (svFieldValue == null) {
												method = svField.getType().getMethod("getInstance", new Class[] { java.lang.String.class });
												svFieldValue = method.invoke(singleVO, currentArgValue);
											}
											if (svFieldValue instanceof CodeType) {
												svField.set(singleVO, svFieldValue);
											}
										} catch (NoSuchMethodException e2) {
											if (svField.getType() == java.lang.String.class) {
												svField.set(singleVO, currentArgValue);
											} else if (svField.getType() == java.lang.Long.class) {
												svField.set(singleVO, Long.parseLong(currentArgValue));
											}
										}
									}
								}
							}
							//finish filling a piece of vo
							filledArray[k] = singleVO;
						}
						//finish filling a group of VOs
						f.set(form, filledArray);
				   }
			   }
		   }
		 }
		 
		return false;
	}

1. 目前做的只适合两级如
" property = 'criterion.grade' "

2.  参数也只有2个是servlet的，打算以后重构

3.  里面只考虑到有线的自定义类型和string别的没加

4.  代码意思，基本上可以看 变量命名就能看懂。