万盛经开区建设局网站,域名解析过程,上海近期新闻事件,做蔬菜的网站有哪些基于Day12中登录页面实现的修改#xff0c;这里实现的是如果登录成功#xff0c;跳到LoginSuccess页面中展示后端查询到数据库中的信息#xff0c;并实现在浏览器实现插入数据和删除数据#xff08;mybaits#xff09;。 当输入账号密码正确后进入LoginSuccess页面#x…基于Day12中登录页面实现的修改这里实现的是如果登录成功跳到LoginSuccess页面中展示后端查询到数据库中的信息并实现在浏览器实现插入数据和删除数据mybaits。 当输入账号密码正确后进入LoginSuccess页面通过resp.getWriter来编写后端需要渲染的页面。
数据删除
后端渲染数据展示的页面
在数据展示页面增加删除操作按钮让点击后跳转到WebServlet(/DelUser)真正实现数据删除的地方
WebServlet(/LoginSuccess)
public class LoginSuccess extends HttpServlet {//收参数Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doPost(req, resp);}Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {ListStudent info (ListStudent) req.getAttribute(AllInfo);PrintWriter wr resp.getWriter();wr.write(!DOCTYPE html);wr.println(html);wr.println(head);wr.write(/head);wr.println(body);wr.write(table cellpadding2 cellspacing2 center100% border1);wr.write(trth学号/thth姓名/thth性别/thth年龄/thth专业/thth操作/th/tr);wr.write(tra hrefInsert信息录入/a/tr);for (int i 0; i info.size(); i) {wr.write(tr);wr.write(td info.get(i).getSno() /td);wr.write(td info.get(i).getName() /td);wr.write(td info.get(i).getSex() /td);wr.write(td info.get(i).getAge() /td);wr.write(td info.get(i).getMajor() /td);wr.write(td a onclick\if(confirm(确认删除吗))return true;return false;\ hrefDelUser?Sno info.get(i).getSno()删除/a/td);wr.write(/tr);}wr.write(/table);wr.println(/body);wr.println(/html);}
} 实现执行删除的操作代码
WebServlet(/DelUser)
public class DelUser extends HttpServlet {Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doPost(req, resp);}Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding(UTF-8);resp.setContentType(text/html;charsetutf-8);String Sno req.getParameter(Sno);System.out.println(Sno Sno);GetMapper getMapper new GetMapper();getMapper.delete(Integer.valueOf(Sno));ArrayListStudent stu getMapper.selectAll();req.setAttribute(AllInfo, stu);if (!stu.isEmpty()) {req.getRequestDispatcher(LoginSuccess).forward(req, resp);}}
}
数据的插入
后端渲染数据插入的页面
WebServlet(/Insert)
public class Insert extends HttpServlet {Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doPost(req, resp);}Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding(UTF-8);resp.setContentType(text/html;charsetutf-8);PrintWriter wr resp.getWriter();wr.println(html);wr.println(head);wr.println(titleServlet Insert/title);wr.println(/head);wr.println(body);wr.println(h1Servlet Insert /h1);wr.write(div classcontainer form actionInsertOk学号input typetext namesnobr 姓名input typetext namenamebr 性别input typetext namesexbr 年龄input typetext nameagebr 专业input typetext namemajorbrbutton提交添加/button /form/div);wr.println(/body);wr.println(/html);}
}
后端处理数据插入的代码
WebServlet(/InsertOk)
public class InsertOk extends HttpServlet {Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doPost(req, resp);}Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding(UTF-8);resp.setContentType(text/html;charsetutf-8);String major req.getParameter(major);String age req.getParameter(age);String sex req.getParameter(sex);String name req.getParameter(name);String sno req.getParameter(sno);Student student new Student(Integer.valueOf(sno),name,sex,Integer.valueOf(age),major);GetMapper getMapper new GetMapper();getMapper.insert(student);ArrayListStudent stu getMapper.selectAll();req.setAttribute(AllInfo, stu);if (!stu.isEmpty()) {req.getRequestDispatcher(LoginSuccess).forward(req, resp);}}
}
