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@ -7,54 +7,59 @@ import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.io.IOException; //导入IO异常和日期类
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import java.util.Date;
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import java.util.Date;
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@WebServlet("/DeptAddStuPunchServlet")
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@WebServlet("/DeptAddStuPunchServlet")
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public class DeptAddStuPunchServlet extends HttpServlet {
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public class DeptAddStuPunchServlet extends HttpServlet { //定义一个继承自HttpServlet的Servlet类。
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@Override
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //重写doGet方法，处理HTTP GET请求。
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//统一请求和响应的字符编码为UTF-8，防止中文乱码，并设置响应内容类型为HTML。
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req.setCharacterEncoding("utf-8");
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req.setCharacterEncoding("utf-8");
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resp.setCharacterEncoding("utf-8");
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resp.setCharacterEncoding("utf-8");
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resp.setContentType("text/html;charset=utf-8");
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resp.setContentType("text/html;charset=utf-8");
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//获取表单请求的参数
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//获取表单请求的参数
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String sno = req.getParameter("sno");
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String sno = req.getParameter("sno"); //从 HTTP 请求中获取参数名为 "sno" 的值，并将其赋值给 sno 变量
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String sispunch = req.getParameter("sispunch");
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String sispunch = req.getParameter("sispunch");//从 HTTP 请求中获取参数名为 "sispunch" 的值，并将其赋值给 sispunch 变量
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String spunchdate = req.getParameter("spunchdate");
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String spunchdate = req.getParameter("spunchdate");//从 HTTP 请求中获取参数名为 "spunchdate" 的值，并将其赋值给 spunchdate 变量
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String spunchtime = req.getParameter("spunchtime");
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String spunchtime = req.getParameter("spunchtime");//从 HTTP 请求中获取参数名为 "spunchtime" 的值，并将其赋值给 spunchtime 变量
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String sishot = req.getParameter("sishot");
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String sishot = req.getParameter("sishot");//从 HTTP 请求中获取参数名为 "sishot" 的值，并将其赋值给 sishot 变量
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String siscough = req.getParameter("siscough");
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String siscough = req.getParameter("siscough");//从 HTTP 请求中获取参数名为 "siscough" 的值，并将其赋值给 siscough 变量
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String sisseem = req.getParameter("sisseem");
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String sisseem = req.getParameter("sisseem");//从 HTTP 请求中获取参数名为 "sisseem" 的值，并将其赋值给 sisseem 变量
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String sisdiagnose = req.getParameter("sisdiagnose");
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String sisdiagnose = req.getParameter("sisdiagnose");//从 HTTP 请求中获取参数名为 "sisdiagnose" 的值，并将其赋值给 sisdiagnose 变量
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String sstatus = req.getParameter("sstatus");
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String sstatus = req.getParameter("sstatus");//从 HTTP 请求中获取参数名为 "sstatus" 的值，并将其赋值给 sstatus 变量
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String sql = null;
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String sql = null;
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//声明SQL语句变量，并输出调试信息
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System.out.println("shgshgh");
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System.out.println("shgshgh");
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//查询是否存在此人
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//查询是否存在此人
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sql = "select count(*) as num from stupunchin where sno = ? and spunchdate = ?";
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sql = "select count(*) as num from stupunchin where sno = ? and spunchdate = ?";//检查stupunchin表中是否存在相同学号和日期的记录
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Object[] objects = {sno, spunchdate};
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Object[] objects = {sno, spunchdate}; //使用Object数组传递参数，防止SQL注入。
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int count = DeptAdminDao.findTotalCount(sql, objects);
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int count = DeptAdminDao.findTotalCount(sql, objects);//调用DAO方法findTotalCount返回匹配记录数。
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if (count == 0){//无则操作
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if (count == 0){//条件判断：如果不存在重复记录（count为0），执行插入操作。
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sql = "insert into stupunchin values(?, ?, ?, ?, ?, ?, ?, ?, ?)";
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sql = "insert into stupunchin values(?, ?, ?, ?, ?, ?, ?, ?, ?)";
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Object[] objects1 = {sno, sispunch, spunchdate, spunchtime, sishot, siscough, sisseem, sisdiagnose, sstatus};
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Object[] objects1 = {sno, sispunch, spunchdate, spunchtime, sishot, siscough, sisseem, sisdiagnose, sstatus};
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//SQL插入语句：向stupunchin表插入包含9个字段的新记录。
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//参数绑定：将表单参数按顺序填入占位符。
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int num = DeptAdminDao.executeUpdate(sql, objects1);
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int num = DeptAdminDao.executeUpdate(sql, objects1);//执行更新：调用DAO方法executeUpdate执行插入，返回受影响的行数。
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System.out.println(num);
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System.out.println(num);
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req.getRequestDispatcher("/DeptQueryStuPunchByPageServlet?currentPage=1&rows=7&sname=&sclass=&spunchdate=").forward(req, resp);
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req.getRequestDispatcher("/DeptQueryStuPunchByPageServlet?currentPage=1&rows=7&sname=&sclass=&spunchdate=").forward(req, resp);
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}else {
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}else {
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req.getRequestDispatcher("/view/alluse/existdataofadd.jsp").forward(req, resp);
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req.getRequestDispatcher("/view/alluse/existdataofadd.jsp").forward(req, resp);//转发请求：插入成功后，转发到分页查询Servlet，显示第一页数据（参数currentPage=1，每页7行）。
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}
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}//处理重复数据：如果记录已存在，转发到提示页面existdataofadd.jsp。
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}
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}
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@Override
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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doGet(req, resp);
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doGet(req, resp);//处理POST请求：重写doPost方法，直接调用doGet，统一处理GET和POST请求。
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}
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}
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}
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}
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hql
5 months ago