4.Java Web开发模式(javaBean+servlet+MVC) - ToB企服应用市场:ToB评测及商务社交产业平台

<%@ page import="com.woniuxy.hrms.entity.Hr" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<base href="<%=basePath%>"/>
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<link rel="stylesheet" type="text/css" href="static/bootstrap/css/bootstrap.min.css">
<script type="text/javascript" src="static/bootstrap/js/bootstrap.min.js"></script>
<script type="text/javascript" src="static/bootstrap/js/jquery.min.js"></script>
<script type="text/javascript">
function check(id) {
var flag = confirm("确认要删除吗?");
if (flag) {
//删除确认,服务器请求跳转至delete方法处理数据库数据
location.href = "hr/delete?id=" + id;
}
}
</script>
<body>
<div class="container" style="padding-top: 40px;">
<div class="form-group">
<div class="row">
<div class="col-md-8">
<form id="searchForm" action="hr/queryByUsername" method="post">
<input type="text" class="form-control" id="selectUserName" name="username"
placeholder="请输入用户名"/>
<button type="submit" class="btn btn-danger search" id="searchBtn">搜索</button>
</form>
</div>
<div class="col-md-3">
<a class="btn btn-round btn-square btn-default" href="manage/hr/add.jsp">添加<i
class="mdi mdi-eye"></i></a>
</div>
</div>
</div>
<%
List<Hr> list = (List<Hr>) request.getAttribute("list");
%>
<table class="table table-bordered text-center">
<tr>
<td>编号</td>
<td>姓名</td>
<td>用户名</td>
<td>电话</td>
<td>地址</td>
<td>操作</td>
</tr>
<%-- 迭代集合--%>
<%
for (Hr hr : list) {
%>
<tr>
<td><%=hr.getId()%>
</td>
<td><%=hr.getRealName()%>
</td>
<td><%=hr.getUsername()%>
</td>
<td><%=hr.getPhone()%>
</td>
<td><%=hr.getAddress()%>
</td>
<td>
<%-- 点击编辑链接,传递当前对象id,并向服务器发送请求--%>
<%-- href="hrms/queryById?id=<%=hr.getId()% 查询字符串以?字符开始 --%>
<%-- <%=hr.getId()%>jsp脚本表达式 --%>
<a class="btn btn-round btn-square btn-info" href="hr/queryById?id=<%=hr.getId()%>">编辑<i
class="mdi mdi-eye"></i></a>
<a class="btn btn-round btn-square btn-warning" href="javascript:check(<%=hr.getId()%>)">删除<i
class="mdi mdi-eye"></i></a>
</td>
</tr>
<%
}
%>
</table>
</div>
</body>
</html>

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public class BaseServlet extends HttpServlet {
//HttpServlet生命周期: 初始化init(),服务运行service(),销毁destroy()
//1.init()仅加载一次
//2.service()随时响应客户端请求,每次获取请求对象调用此方法
//3.destroy()仅调用一次, 释放servlet所占用的资源。如关闭文件输入输出流，关闭与数据库的连接。
//多次调用,每次服务器获取请求对象调用service方法,随时响应客户端请求
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取请求路径
String requestURI = req.getRequestURI();
//检索请求路径最后的方法名
String methodName = requestURI.substring(requestURI.lastIndexOf("/") + 1);
Method declaredMethod;
try {
//动态调用对象方法
declaredMethod = this.getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
declaredMethod.invoke(this, req, resp);
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}

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@WebServlet(value = "/hr/*", loadOnStartup = 1)
public class HrServlet extends BaseServlet {
HrService hrService;
@Override
public void init(ServletConfig config) throws ServletException {
ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-config.xml");
//config.getServletContext()创建ServletContext对象,用来存储applicationContext对象,整个Web应用范围内访问它
config.getServletContext().setAttribute("applicationContext", applicationContext);
hrService = applicationContext.getBean("hrService", HrService.class);
}
protected void queryByUsername(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
List<Hr> list = hrService.queryByUsername(username);
list.forEach(System.out::println);
req.setAttribute("list", list);
req.getRequestDispatcher("../manage/hr/show.jsp").forward(req, resp);
}
protected void queryAll(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
List<Hr> list = hrService.queryAll();
req.setAttribute("list", list);
req.getRequestDispatcher("../manage/hr/show.jsp").forward(req, resp);
}
protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// req.setCharacterEncoding("utf-8");
Hr hr = new Hr();
hr.setRealName(req.getParameter("realName"));
hr.setUsername(req.getParameter("username"));
hr.setAddress(req.getParameter("address"));
hr.setPhone(req.getParameter("phone"));
System.out.println(hr);
int i = hrService.insertSelective(hr);
//数据库添加数据,并重新调用queryAll走页面展示流程
queryAll(req, resp);
}
protected void queryById(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String id = req.getParameter("id");
Hr hr = hrService.selectByPrimaryKey(Long.parseLong(id));
req.setAttribute("hr", hr);
// 跳转页面,带着对象forward(),地址栏不变
req.getRequestDispatcher("../manage/hr/update.jsp").forward(req, resp);
// 单纯跳转页面,并不能携带对象,地址栏更新
// resp.sendRedirect("/hr/update.jsp");
}
protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// req.setCharacterEncoding("utf-8");
Hr hr = new Hr();
//更新必须有id,负责更新所有内容,依据id更新
// where dept_id = #{deptId,jdbcType=INTEGER}
//获取页面update.jsp请求对象传递的参数
hr.setId(Integer.parseInt(req.getParameter("id")));
hr.setRealName(req.getParameter("realName"));
hr.setUsername(req.getParameter("username"));
hr.setAddress(req.getParameter("address"));
hr.setPhone(req.getParameter("phone"));
int update = hrService.updateByPrimaryKeySelective(hr);
//更新完显示全部数据(查询全部数据反馈给show.jsp)
queryAll(req, resp);
}
protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String id = req.getParameter("id");
hrService.deleteByPrimaryKey(Long.parseLong(id));
queryAll(req, resp);
}
protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//负责处理login.jsp提交
//获取提交对象的username和password
String username = req.getParameter("username");
String password = req.getParameter("password");
Hr hr = hrService.login(username, password);
//
HttpSession session = req.getSession();
session.setAttribute("hr", hr);
if (hr != null) {
//本地存储,在浏览器存储数据
Cookie[] cookies = req.getCookies();
boolean flag = false;
for (Cookie cookie : cookies) {
String name = cookie.getName();
if (name.equals("username")) {
flag = true;
}
}
if (!flag) {
Cookie username1 = new Cookie("username", username);
Cookie password1 = new Cookie("password", password);
//设置cookie存储路径
username1.setPath("/hrms");
password1.setPath("/hrms");
username1.setMaxAge(60 * 60 * 24);
password1.setMaxAge(60 * 60 * 24);
resp.addCookie(username1);
resp.addCookie(password1);
}
//路径可以: ../或/hrms根路径下的页面
resp.sendRedirect("/hrms/admin.jsp");
} else {
resp.sendRedirect("../login.jsp");
}
}
}

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