@Override
public void init(ServletConfig servletConfig) throws ServletException {
// 初始化 Helper 类
HelperLoader.init();
// 获取 ServletContext 对象（用于注册Servlet）
ServletContext servletContext = servletConfig.getServletContext();
// 注册处理 JSP 的 Servlet
ServletRegistration jspServlet = servletContext.getServletRegistration("jsp");
jspServlet.addMapping(ConfigHelper.getAppJspPath() + "*");
// 注册处理静态资源的默认 Servlet
ServletRegistration defaultServlet = servletContext.getServletRegistration("default");
defaultServlet.addMapping(ConfigHelper.getAppAssetPath() + "*");
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// 获取请求方法与请求路径
String requestMethod = req.getMethod().toLowerCase();
String requestPath = req.getPathInfo();
// 获取 Action 处理器
Handler handler = ControllerHelper.getHandler(requestMethod, requestPath);
if (handler != null) {
// 获取 Controller 类及其 Bean 实例
Class<?> controllerClass = handler.getControllerClass();
Object controllerBean = BeanHelper.getBean(controllerClass);
// 创建请求参数对象
Map<String, Object> paramMap = new HashMap<String, Object>();
Enumeration<String> paramNames = req.getParameterNames();
while (paramNames.hasMoreElements()) {
String paramName = paramNames.nextElement();
String paramValue = req.getParameter(paramName);
paramMap.put(paramName, paramValue);
}
String body = CodecUtil.decodeURL(StreamUtil.getString(req.getInputStream()));
if (StringUtil.isNotEmpty(body)) {
String[] params = StringUtil.splitString(body, "&");
if (ArrayUtil.isNotEmpty(params)) {
for (String param : params) {
String[] array = StringUtil.splitString(param, "=");
if (ArrayUtil.isNotEmpty(array) && array.length == 2) {
String paramName = array[0];
String paramValue = array[1];
paramMap.put(paramName, paramValue);
}
}
}
}
Param param = new Param(paramMap);
// 调用 Action 方法
Method actionMethod = handler.getActionMethod();
Object result = ReflectionUtil.invokeMethod(controllerBean, actionMethod, param);
// 处理 Action 方法返回值
if (result instanceof View) {
// 返回 JSP 页面
View view = (View) result;
String path = view.getPath();
if (StringUtil.isNotEmpty(path)) {
if (path.startsWith("/")) {
resp.sendRedirect(req.getContextPath());
} else {
Map<String, Object> model = view.getModel();
for (Map.Entry<String, Object> entry : model.entrySet()) {
req.setAttribute(entry.getKey(), entry.getValue());
}
req.getRequestDispatcher(ConfigHelper.getAppJspPath() + path).forward(req, resp);
}
}
} else if (result instanceof Data) {
// 返回 Json 数据
Data data = (Data) result;
Object model = data.getModel();
if (model != null) {
resp.setContentType("application/json");
resp.setCharacterEncoding("UTF-8");
PrintWriter writer = resp.getWriter();
String json = JsonUtil.toJson(model);
writer.write(json);
writer.flush();
writer.close();
}
}
}
}