思维导图
?一.解决初始化子控制器容器问题
? ? ??1.必须有配置文件config.xml
?? ? ?2.config.xml要包含处理业务的子控制器
? ? ? 3.读取到配置文件中的对应的处理浏览器请求的子控制器
config.xml配置
<action path="/book" type="com.tz.framework.BookAction">
?? ??? ?<forward name="list" path="/bookList.jsp" redirect="false" />
?? ??? ?<forward name="toList" path="/book.action?methodName=list" redirect="true" />
</action>?控制器代码
?private ConfigModel configModel=null;
@Override
?? ?public void init() throws ServletException {
?? ??? ?try {
?? ??? ??? ?configModel=ConfigModelFactory.build();
?? ??? ?} catch (Exception e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
@Override
?? ?protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
?? ??? ?String uri = req.getRequestURI();
?? ??? ?uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
?? ??? ?ActionModel actionModel = configModel.pop(uri);
?? ??? ?String type = actionModel.getType();
?? ??? ?try {
?? ??? ??? ?ActionSupport action = (ActionSupport) Class.forName(type).newInstance();
? ? ? ? ? ? action.execute(req, resp);
?? ??? ?} catch (Exception e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ?}
?二.解决参数实体类封装问题
方案：泛型+反射
步骤：
创建ModelDriver接口用于中央控制器创建对象用来赋值
public interface ModelDriver<T> {
?? ?T getModel();
}子控制器继承重写
public class BookAction extends ActionSupport implements ModelDriver<Book>{
????????private Book book=new Book();
? ? @Override
? ? ?public Book getModel() {
?? ??? ?return book;
? ? ?}
}????????中央控制器赋值代码：
if(action instanceof ModelDriver) {//有对象
?? ??? ??? ??? ?//接收所有的前端jsp传递到后台的参数
?? ??? ??? ??? ?ModelDriver m=(ModelDriver) action;
?? ??? ??? ??? ?Object obj = m.getModel();
?? ??? ??? ??? ?Map<String, String[]> parameterMap = req.getParameterMap();
?? ??? ??? ??? ?BeanUtils.populate(obj, parameterMap);
?}?三、解决结果集代码重复问题
方案：在一个地方统一管理重定向还是转发，并且是定位跳转到哪一个页面
步骤：
config.xml中定义数值
<action path="/book" type="com.tz.framework.BookAction">
?? ??? ?<forward name="list" path="/bookList.jsp" redirect="false" />
?? ??? ?<forward name="toList" path="/book.action?methodName=list" redirect="true" />
</action>方法返回字符串判断跳转方法
private String list(HttpServletRequest req, HttpServletResponse resp) {
?? ??? ?System.out.println("BookAction调用bookDao.list()...");
?? ??? ?return "list";
?? ?}
?private String load(HttpServletRequest req, HttpServletResponse resp) {
?? ??? ?System.out.println("BookAction调用bookDao.load()...");
?? ??? ?return "toList";
?}中央控制器判断跳转代码：
String res = action.execute(req, resp);
?ForwardModel forwardModel = actionModel.pop(res);
?if(forwardModel.isRedirect()) {
?????????resp.sendRedirect(req.getContextPath()+forwardModel.getPath());
?}else {
?? ??? ???req.getRequestDispatcher(forwardModel.getPath()).forward(req, resp);
?}?代码截图：
中央控制器：
?config.xml文件：
?ModelDriver接口：
?子控制器：
