campus-lost-found/PostItemServlet.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("/post")
public class PostItemServlet extends HttpServlet {
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        if (!SessionUtil.isLoggedIn(req)) {
            resp.sendRedirect("login.jsp");
            return;
        }
        req.getRequestDispatcher("/post-item.jsp").forward(req, resp);
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        req.setCharacterEncoding("UTF-8");

        var user = SessionUtil.getCurrentUser(req);
        if (user == null) {
            resp.sendRedirect("login.jsp");
            return;
        }

        Item item = new Item();
        item.setUserId(user.getId());
        item.setType(req.getParameter("type"));
        item.setCategory(req.getParameter("category"));
        item.setDescription(req.getParameter("description"));
        item.setLocation(req.getParameter("location"));
        item.setTime(req.getParameter("time"));
        item.setContact(req.getParameter("contact"));

        InMemoryDAO.addItem(item);
        resp.sendRedirect("my-items.jsp?msg=发布成功！");
    }
}