由於struts等開源MVC框架有漏洞，可以考慮自己實現一套輕量級的MVC框架
自定義一個Dispatcher，實現spring的ApplicationContextAware介面

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public class AjaxDispatcher implements ApplicationContextAware {
//兩個最重要的容器，分別儲存請求path對應的method，以及請求path對應的bean。為了以後反射呼叫method.invoke(bean)
private static Map<String, Method> ajaxName2Method = new ConcurrentHashMap<String, Method>();
private static Map<String, Object> ajaxName2Bean = new ConcurrentHashMap<String, Object>();
...
@override
public void setApplicationContext(ApplicationContext ctx) throws BeansException {
Map<String, Object> map = ctx.getBeansWithAnnotation(AjaxClass.class);//要求每個Ajax類在宣告時會加上@AjaxClass，AjaxClass為自定義annotation
Collection<Object> beans = map.values();
for (Object bean : beans) {
logger.info(\"Inspecting AjaxClass: \" + bean.getClass());
registerAjaxClass(bean.getClass(), bean);
}
}
public static void registerAjaxClass(Class beanClass, Object bean) {
String prefix = ((AjaxClass) beanClass.getAnnotation(AjaxClass.class)).prefix();
if (prefix == null) {
prefix = \"\";
}
//將Ajax類的每個方法註冊到ajaxName2Method容器中
Method[] ms = beanClass.getMethods();
for (int j = 0; j < ms.length; j++) {
Method m = ms[j];
//跟AjaxClass一樣，Ajax類中的每個method也會宣告為AjaxMethod（自定義annotation，其中有path屬性）
AjaxMethod ajaxMethod = m.getAnnotation(AjaxMethod.class);
if (ajaxMethod != null) {
String path = ajaxMethod.path();
if (path == null || path.trim().equals(\"\")) {
path = m.getName();
}
String fullPath = prefix + path;
ajaxName2Method.put(fullPath, ms[j]);
logger.info(\"Registering ajax method at path: \" + fullPath);
ajaxName2Bean.put(fullPath, bean);
}
}
}
//業務邏輯呼叫，每一個請求都會呼叫該方法（web.xml中配置相應的servlet，servlet中呼叫該方法）
public static String dispatch(Map<String, String> req) throws Exception {
ObjectMapper mapper = new ObjectMapper();
String path = req.get(KEY_PATH);
Object ins = ajaxName2Bean.get(path);
Method m = ajaxName2Method.get(path);
if (m == null) {
logger.error(\"No matching method found for path: \" + path);
return METHOD_ERROR_RESPONSE;
}
Class<?>[] paramClasses = m.getParameterTypes();
Object[] paramValues = null;
if (null != paramClasses && 1 == paramClasses.length) {
paramValues = new Object[paramClasses.length];
try {
paramValues[0] = Long.parseLong(req.get(KEY_USERID));
} catch (NumberFormatException e) {
logger.error(\"userid incorrect\" + req.get(KEY_USERID), e);
return PARAM_ERROR_RESPONSE;
}
} else if (null != paramClasses && 2 <= paramClasses.length) {
paramValues = new Object[paramClasses.length];
try {
paramValues[0] = Long.parseLong(req.get(KEY_USERID));
} catch (NumberFormatException e) {
logger.error(\"userid incorrect\" + req.get(KEY_USERID), e);
return PARAM_ERROR_RESPONSE;
}
try {
paramValues[1] = mapper.readValue(req.get(KEY_PARAM), paramClasses[1]);
} catch (Exception e) {
logger.error(\"Can not deserialize json param \" + req.get(KEY_PARAM) + \" to class \" + paramClasses[1], e);
return PARAM_ERROR_RESPONSE;
}
}
try {
Object result = m.invoke(ins, paramValues);
if (result instanceof String) {
return (String) result;
} else {
StringWriter buf = new StringWriter();
mapper.writeValue(buf, result);
return buf.toString();
}
} catch (Throwable e) {
logger.error(\"Exception occured when invoke Ajax Method, path=\" + path, e);
return DEFAULT_ERROR_RESPONSE;
}
}
}

Spring自定義MVC

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