让JFinal支持接收多个Model的参数

问题来源：http://www.oschina.net/question/203191_63769

这两天有空，就把它实现了下，代码如下：

首先在 com.jfinal.core.Controller 类中加入如下两个方法：

public <T> List<T> getModels(Class<T> modelClass)
{
	return ModelInjector.injects(modelClass, getRequest(), false);
}
	
public <T> List<T> getModels(Class<T> modelClass, String modelName)
{
	return ModelInjector.injects(modelClass, modelName, getRequest(), false);
}

然后，在类com.jfinal.core.ModelInjector 中，加入如下方法：

public static <T> List<T> injects(Class<?> modelClass, HttpServletRequest request, boolean skipConvertError) {
	String modelName = modelClass.getSimpleName();
	return injects(modelClass, StringKit.firstCharToLowerCase(modelName), request, skipConvertError);
}
	
@SuppressWarnings({ "unchecked"})
public static final <T> List<T> injects(Class<?> modelClass, String modelName, HttpServletRequest request, boolean skipConvertError) {
	if(Model.class.isAssignableFrom(modelClass)) {
		return injectActiveRecordModels((Class<Model<?>>) modelClass, modelName, request, skipConvertError);
	}else
		return injectCommonModels(modelClass, modelName, request,  skipConvertError);
}
	
@SuppressWarnings({ "unchecked" })
private static final <T> List<T> injectActiveRecordModels(final Class<Model<?>> modelClass, final String modelName, final HttpServletRequest request, final boolean skipConvertError) {
	TableInfo tableInfo = TableInfoMapping.me().getTableInfo(modelClass);
	List<T> list = new ArrayList<T>();

	String modelNameAndLeft = modelName + "[";
		
	Map<String, String[]> parasMap = request.getParameterMap();
		
	for (Entry<String, String[]> e : parasMap.entrySet()) {
		String paraKey = e.getKey();
			
		if (paraKey.startsWith(modelNameAndLeft) ) {
			String paraName = paraKey.substring(paraKey.indexOf("]")+2);
			Class<?> colType = tableInfo.getColType(paraName);
				
			if (colType == null)
				throw new ActiveRecordException("The model attribute " + paraName + " is not exists.");
				
			String[] paraValue = e.getValue();

			try {
				Object value = paraValue[0] != null ? TypeConverter.convert(colType, paraValue[0]) : null;

				int index = Integer.parseInt(paraKey.substring(paraKey.indexOf("[")+1, paraKey.indexOf("]")));

				int listSize = list.size();
					
				Model<?> model = null;
					
				if(listSize <= index)
				{
					//中间的部分添加成null。
					int size = index - listSize;
			                for(int i =0; i<size; i++) {
							       list.add(listSize + i,null);
					}
					model = modelClass.newInstance();
					list.add(index,(T) model);
				}
				else
				{
					model = (Model<?>) list.get(index);
					if(model == null) {
						model = modelClass.newInstance();
							list.set(index, (T) model);
					}
				}
				model.set(paraName, value);
					
			} catch (Exception ex) {
				if (skipConvertError == false)
					throw new ModelInjectException("Can not convert parameter: " + paraKey, ex);
			}
		}
	}
		
	List<T> nullList = new ArrayList<T>(1);
	nullList.add(null);
	list.removeAll(nullList);

	return list;
}

@SuppressWarnings("unchecked")
private static final <T> List<T> injectCommonModels(Class<?> modelClass, String modelName, HttpServletRequest request,  boolean skipConvertError) {
	Map<String,Class<?>> attrNames = getObjectSetAttrName(modelClass);
		
	List<T> list = new ArrayList<T>();

	String modelNameAndLeft = modelName + "[";
		
	Map<String, String[]> parasMap = request.getParameterMap();
		
	for (Entry<String, String[]> e : parasMap.entrySet()) {
		String paraKey = e.getKey();
			
		if (paraKey.startsWith(modelNameAndLeft) ) {
			String paraName = paraKey.substring(paraKey.indexOf("]")+2);
				
			//判断这个字段是否是对象对应的set方法，并且只有一个参数。如果没有，则抛出异常 
			if(!attrNames.containsKey(paraName))
				throw new ActiveRecordException("The object attribute " + paraName + " method is not exists.");
				
			String[] paraValue = e.getValue();

			try {
				Object value = paraValue[0] != null ? TypeConverter.convert(attrNames.get(paraName), paraValue[0]) : null;

				int index = Integer.parseInt(paraKey.substring(paraKey.indexOf("[")+1, paraKey.indexOf("]")));

				int listSize = list.size();
					
				Object model = null;
					
				if(listSize <= index)
				{
					//中间的部分添加成null。
					int size = index - listSize;
					for(int i =0; i<size; i++) {
							list.add(listSize + i,null);
					}
					model = modelClass.newInstance();
					list.add(index,(T) model);
				}
				else
				{
					model = list.get(index);
					if(model == null) {
						model = modelClass.newInstance();
							list.set(index, (T) model);
					}
				}
					
				//设置对象的方法的值
				Method method = model.getClass().getMethod("set" + StringKit.firstCharToUpperCase(paraName), attrNames.get(paraName));
				method.invoke(model, value);
					
			} catch (Exception ex) {
				if (skipConvertError == false)
					throw new ModelInjectException("Can not convert parameter: " + paraKey, ex);
			}
		}
	}
		
	List<T> nullList = new ArrayList<T>(1);
	nullList.add(null);
	list.removeAll(nullList);

	return list;
}
	
private static final Map<String,Class<?>> getObjectSetAttrName(Class<?> modelClass) {
	Map<String,Class<?>> attrNames = new HashMap<String,Class<?>>();
		
	Method[] methods = modelClass.getMethods();
	for (Method method : methods) {
		String methodName = method.getName();
			
		//取出对应的set方法，并且只有一个参数。
		if (methodName.startsWith("set") == false)	// only setter method
			continue;
			
		Class<?>[] types = method.getParameterTypes();
		if (types.length != 1)						// only one parameter
			continue;
			
		String attrName = methodName.substring(3);
			attrNames.put(StringKit.firstCharToLowerCase(attrName), types[0]);
	}
	return attrNames;
}

@JFinal ，有空过来指正一下。