减少冗余代码

Question

我开始感觉多余，因为我必须指定 doGet 参数及其每次抛出的内容。有没有办法在我的 Controller 中完成所有这些操作，这样就不必在每个页面上完成这些操作？我的 Controller 目前没有 doGet()

@WebServlet(name = "EditServlet", urlPatterns = {"/content/edit"})
public class EditServlet extends cms.library.Controller {
    @Override
    public void doGet (HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.loadView(new cms.library.PageConfig()
                .setRequest(request)
                .setResponse(response)
                .setTemplate("/content/edit"));
    }

    @Override
    public void doPost (HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        System.out.println("posted");

        this.doGet(request, response);
    }
}

Answer 1

您可以将模板传递给 cms.library.Controller 类，这样您就不必每次都定义 doGet。

public class Controller {
    private final String template;
    public Controller( String template ) {
        this.template = template;
    }
    @Override
    public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.loadView(new cms.library.PageConfig()
                .setRequest(request)
                .setResponse(response)
                .setTemplate(template));
    }
}

@WebServlet(name = "EditServlet", urlPatterns = {"/content/edit"})
public class EditServlet extends cms.library.Controller {
    public EditServlet() {
        super("/content/edit");
    }
    @Override
    public void doPost (HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("posted");
        this.doGet(request, response);
    }
}

或者，您可以创建自己的注释，并且 Controller 类将在其构造函数中检查实现类以获取注释（而不是传入字符串）。