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Update GetByStartEndStationServlet.java

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pull/1/head
pght2c95q 8 months ago
parent b5d3c0ca82
commit 3775c434c6
1 changed files with 104 additions and 97 deletions
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ticketing-master/src/com/cn/servlet/GetByStartEndStationServlet.java
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@ -21,108 +21,115 @@ import com.cn.service.impl.TrainServiceImpl;
* @date: 2019年9月11日 下午4:41:33 * @date: 2019年9月11日 下午4:41:33
*/ */
public class GetByStartEndStationServlet extends HttpServlet { public class GetByStartEndStationServlet extends HttpServlet {
private static final long serialVersionUID = 1L; private static final long serialVersionUID = 1L;
/** /**
* @see HttpServlet#HttpServlet() * HttpServlet的构造函数。
*/ */
public GetByStartEndStationServlet() { public GetByStartEndStationServlet() {
super(); super();
// TODO Auto-generated constructor stub // 构造函数中的代码，通常不需要自定义操作，因为父类已经处理
} }
/** /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) * 处理GET请求的方法。
*/ * 当客户端发送GET请求时，这个方法会被调用。
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { * @param request HttpServletRequest对象，包含客户端请求信息。
* @param response HttpServletResponse对象，用于发送响应到客户端。
/** * @throws ServletException 可能抛出的Servlet异常。
* 先执行，将所有车次信息展示到界面 * @throws IOException 可能抛出的IO异常。
*/ */
TrainService trainService = new TrainServiceImpl(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Train> startStationList = trainService.getAllStartStation(); // 创建TrainService的实现类对象，用于访问车次相关的业务逻辑
if(startStationList != null) { TrainService trainService = new TrainServiceImpl();
request.setAttribute("startStationList", startStationList); // 获取所有起始站信息
}else { List<Train> startStationList = trainService.getAllStartStation();
request.setAttribute("msg", "初始站站点为空"); if(startStationList != null) {
} request.setAttribute("startStationList", startStationList);
} else {
List<Train> endStationList = trainService.getAllEndStation(); request.setAttribute("msg", "初始站站点为空");
if(endStationList != null) { }
request.setAttribute("endStationList", endStationList);
}else { // 获取所有终点站信息
request.setAttribute("msg", "终点站站点为空"); List<Train> endStationList = trainService.getAllEndStation();
} if(endStationList != null) {
request.setAttribute("endStationList", endStationList);
List<Train> trainList = trainService.getAll(); } else {
if(trainList != null) { request.setAttribute("msg", "终点站站点为空");
request.setAttribute("trainList", trainList); }
}else {
request.setAttribute("msg", "没有任何站点信息"); // 获取所有车次信息
} List<Train> trainList = trainService.getAll();
if(trainList != null) {
String msg = (String) request.getSession().getAttribute("msg"); request.setAttribute("trainList", trainList);
request.setAttribute("msg", msg); } else {
request.setAttribute("msg", "没有任何站点信息");
request.getRequestDispatcher("pages/user/getByStartEndStation.jsp").forward(request, response); }
} // 从session中获取消息，并设置到request属性中
String msg = (String) request.getSession().getAttribute("msg");
/** request.setAttribute("msg", msg);
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/ // 转发请求到JSP页面
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.getRequestDispatcher("pages/user/getByStartEndStation.jsp").forward(request, response);
}
/**
* 后执行，处理会员查询车次信息业务，将查询结果展示到界面
*/
String startStation = request.getParameter("startStation");
String endStation = request.getParameter("endStation");
String startTime = request.getParameter("startTime");
TrainService trainService = new TrainServiceImpl();
List<Train> startStationList = trainService.getAllStartStation();
// 将站点列表传到界面，否则下拉框将没有站点
if(startStationList != null) {
request.setAttribute("startStationList", startStationList);
}else {
//request.setAttribute("msg", "初始站站点为空");
request.getSession().setAttribute("msg", "初始站站点为空");
}
List<Train> endStationList = trainService.getAllEndStation();
if(endStationList != null) {
request.setAttribute("endStationList", endStationList);
}else {
//request.setAttribute("msg", "终点站站点为空");
request.getSession().setAttribute("msg", "终点站站点为空");
}
List<Train> list = trainService.getByStartEndStation(startStation, endStation, startTime);
PrintWriter out = response.getWriter();
// 判断是否查询到车次
if(list!=null && list.size()>0) {
// 查到了，将结果转发到界面
request.setAttribute("trainList", list);
request.getRequestDispatcher("pages/user/getByStartEndStation.jsp").forward(request, response);
} else {
// 没有查到
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
String path = "<script>alert('很抱歉，没有查询到车次！');"
+ "window.location.href='"+basePath+"GetByStartEndStationServlet'</script>";
out.write(path);
}
out.close();
}
/**
* 处理POST请求的方法。
* 当客户端发送POST请求时，这个方法会被调用。
* @param request HttpServletRequest对象，包含客户端请求信息。
* @param response HttpServletResponse对象，用于发送响应到客户端。
* @throws ServletException 可能抛出的Servlet异常。
* @throws IOException 可能抛出的IO异常。
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 获取请求参数
String startStation = request.getParameter("startStation");
String endStation = request.getParameter("endStation");
String startTime = request.getParameter("startTime");
// 创建TrainService的实现类对象
TrainService trainService = new TrainServiceImpl();
// 获取所有起始站信息
List<Train> startStationList = trainService.getAllStartStation();
// 将站点列表传到界面
if(startStationList != null) {
request.setAttribute("startStationList", startStationList);
} else {
// 将消息设置到session中
request.getSession().setAttribute("msg", "初始站站点为空");
}
// 获取所有终点站信息
List<Train> endStationList = trainService.getAllEndStation();
if(endStationList != null) {
request.setAttribute("endStationList", endStationList);
} else {
// 将消息设置到session中
request.getSession().setAttribute("msg", "终点站站点为空");
}
// 根据起始站、终点站和起始时间查询车次
List<Train> list = trainService.getByStartEndStation(startStation, endStation, startTime);
// 获取PrintWriter对象用于输出JavaScript代码
PrintWriter out = response.getWriter();
// 判断是否查询到车次
if(list!=null && list.size()>0) {
// 查到了，将结果转发到界面
request.setAttribute("trainList", list);
request.getRequestDispatcher("pages/user/getByStartEndStation.jsp").forward(request, response);
} else {
// 没有查到，输出JavaScript代码提示用户并重定向
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
String path = "<script>alert('很抱歉，没有查询到车次！');"
+ "window.location.href='"+basePath+"GetByStartEndStationServlet'</script>";
out.write(path);
}
// 关闭PrintWriter对象
out.close();
}
} }
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