Java 前后端雨量管理系统（学习项目）

package servlet; import java.io.IOException; import java.io.PrintWriter; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import entity.RainManage; import service.RainManageService; import service.impl.RainManageServiceImpl; public class RainManageServlet extends HttpServlet { /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html"); PrintWriter out = response.getWriter(); RainManageService service = new RainManageServiceImpl(); // 获取请求 String opr = request.getParameter("opr"); if ("list".equals(opr)) { List<RainManage> list = service.findAllRain(); request.setAttribute("list", list); request.getRequestDispatcher("index.jsp") .forward(request, response); } else if ("add".equals(opr)) { boolean flag = true;// 表示数据没问题 String disName = request.getParameter("disName"); String date = request.getParameter("date"); String rain = request.getParameter("rain"); String station = request.getParameter("station"); String address = request.getParameter("address"); // int rainNum = 0; // Date dateTime = null; if (disName == "" || disName == null) { flag = false; } if (date == "" || date == null) { flag = false; } if (rain == "" || rain == null) { flag = false; } if (station == "" || station == null) { flag = false; } if (address == "" || address == null) { flag = false; } if (flag == false) { response.sendRedirect("add.jsp"); } else { RainManage rainMg = new RainManage(); rainMg.setDistrictName(disName); rainMg.setMonitoringAddress(address); rainMg.setMonitoringStation(station); rainMg.setRain(Integer.parseInt(rain)); try { rainMg.setMonitorTime(new SimpleDateFormat("yyyy-MM-dd") .parse(date)); } catch (ParseException e) { e.printStackTrace(); } if (service.addRain(rainMg)) { response.sendRedirect("index.jsp"); } else { response.sendRedirect("add.jsp"); } } } else if ("del".equals(opr)) { String id = request.getParameter("id"); if (id != "" && id != null) { int Id = Integer.parseInt(id); if (service.delRain(Id)) {// 执行删除操作 out.print("{\"res\":\"true\"}"); } else { out.print("{\"res\":\"false\"}"); } } } else if ("getRain".equals(opr)) { String id = request.getParameter("id"); if (id != "" && id != null) { int Id = Integer.parseInt(id); RainManage rain = service.getRainByid(Id);// 通过id获取雨量信息 request.setAttribute("rain", rain); // request.getRequestDispatcher("update.jsp").forward(request, // response); request.getRequestDispatcher("add.jsp").forward(request, response); } } else if ("update".equals(opr)) { boolean flag = true;// 表示数据没问题 String disName = request.getParameter("disName"); String date = request.getParameter("date"); String rain = request.getParameter("rain"); String station = request.getParameter("station"); String address = request.getParameter("address"); String id = request.getParameter("id"); // int rainNum = 0; // Date dateTime = null; if (disName == "" || disName == null) { flag = false; } if (date == "" || date == null) { flag = false; } if (rain == "" || rain == null) { flag = false; } if (station == "" || station == null) { flag = false; } if (address == "" || address == null) { flag = false; } if (id == "" || id == null) { flag = false; } if (flag == false) { response.sendRedirect("add.jsp"); } else { RainManage rainMg = new RainManage(); int Id = Integer.parseInt(id); rainMg.setId(Id); rainMg.setDistrictName(disName); rainMg.setMonitoringAddress(address); rainMg.setMonitoringStation(station); rainMg.setRain(Integer.parseInt(rain)); try { rainMg.setMonitorTime(new SimpleDateFormat("yyyy-MM-dd") .parse(date)); } catch (ParseException e) { e.printStackTrace(); } if (service.updateRain(rainMg)) { response.sendRedirect("index.jsp"); } else { response.sendRedirect("add.jsp"); } } out.flush(); out.close(); } } }