campus-lost-found/ClaimServlet.java

package com.lostfound.servlet;

import com.lostfound.dao.InMemoryDAO;
import com.lostfound.model.Item;
import com.lostfound.util.SessionUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/claim")
public class ClaimServlet extends HttpServlet {
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        if (!SessionUtil.isLoggedIn(req)) {
            resp.sendRedirect("login.jsp");
            return;
        }

        String itemId = req.getParameter("id");
        Item item = InMemoryDAO.getItem(itemId);
        if (item == null) {
            resp.sendRedirect("search.jsp?error=物品不存在");
            return;
        }

        req.setAttribute("item", item);
        req.getRequestDispatcher("/claim-confirm.jsp").forward(req, resp);
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        String itemId = req.getParameter("itemId");
        InMemoryDAO.markAsMatched(itemId);
        resp.sendRedirect("my-items.jsp?msg=认领成功！对方已获得积分。");
    }
}