删除功能分析和代码实现
删除功能分析
list.jsp:
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的浏览器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
width: 默认宽度与设备的宽度相同
initial-scale: 初始的缩放比，为1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>用户信息管理系统</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<style type="text/css">
td, th {
text-align: center;
}
</style>
<%-- 删除指定id --%>
<script>
function deleteUser(id) {
//用户安全提示
if (confirm("确定要删除吗?")){
//访问路径
location.href = "${pageContext.request.contextPath}/delUserServlet?id="+id;
}
}
</script>
</head>
<body>
<div class="container">
<h3 style="text-align: center">用户信息列表</h3>
<div style="float: left">
<form class="form-inline">
<div class="form-group">
<label for="exampleInputName2">姓名</label>
<input type="text" class="form-control" id="exampleInputName2" placeholder="李四">
</div>
<div class="form-group">
<label for="exampleInputEmail2">籍贯</label>
<input type="email" class="form-control" id="exampleInputEmail2" placeholder="北京">
</div>
<div class="form-group">
<label for="exampleInputEmail3">邮箱</label>
<input type="email" class="form-control" id="exampleInputEmail3" placeholder="">
</div>
<button type="submit" class="btn btn-default">查询</button>
</form>
</div>
<div style="float: right; margin: 5px">
<td colspan="8" align="center"><a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加联系人</a></td>
<td colspan="8" align="center"><a class="btn btn-primary" href="add.html">删除选中</a></td>
</div>
<table border="1" class="table table-bordered table-hover">
<tr class="success">
<th><input type="checkbox"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th>籍贯</th>
<th>QQ</th>
<th>邮箱</th>
<th>操作</th>
</tr>
<c:forEach items="${users}" var="user" varStatus="s">
<tr>
<td><input type="checkbox"></td>
<td>${s.count}</td>
<td>${user.name}</td>
<td>${user.gender}</td>
<td>${user.age}</td>
<td>${user.address}</td>
<td>${user.qq}</td>
<td>${user.email}</td>
<td>
<a class="btn btn-default btn-sm" href="update.html">修改</a>
<%--<a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/delUserServlet?id=${user.id}">删除</a>--%>
<a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id})">删除</a>
</td>
</tr>
</c:forEach>
</table>
<div>
<nav aria-label="Page navigation">
<ul class="pagination">
<li>
<a href="#" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
<li><a href="#">1</a></li>
<li><a href="#">2</a></li>
<li><a href="#">3</a></li>
<li><a href="#">4</a></li>
<li><a href="#">5</a></li>
<li>
<a href="#" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
</li>
<span style="font-size: 25px;margin-left: 5px">
共15条记录，共4页
</span>
</ul>
</nav>
</div>
</div>
</body>
</html>
UserDao接口：
package com.example.dao; import com.example.domain.User1; import java.util.List; /** * 用户操作的dao */ public interface UserDao { public List<User1> findAll(); public User1 findUserByUsernameAndPassword(String username,String password); void add(User1 user1); void delete(int id); }
UserDaoImpl类：
package com.example.dao.impl; import com.example.dao.UserDao; import com.example.domain.User1; import com.example.util.JDBCUtils; import org.springframework.dao.DataAccessException; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import java.util.List; public class UserDaoImpl implements UserDao { private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource()); @Override public List<User1> findAll() { //实现JDBC数据库操作 //定义sql String sql = "select * from user1"; List<User1> users = template.query(sql, new BeanPropertyRowMapper<User1>(User1.class)); return users; } @Override public User1 findUserByUsernameAndPassword(String username, String password) { try { String sql = "select * from user1 where username = ? and password = ?"; User1 user1 = template.queryForObject(sql, new BeanPropertyRowMapper<User1>(User1.class), username, password); return user1; } catch (DataAccessException e) { e.printStackTrace(); return null; } } @Override public void add(User1 user1) { //1.定义sql String sql = "insert into user1 value(null,?,?,?,?,?,?,null,null)"; //2.执行sql template.update(sql,user1.getName(),user1.getGender(),user1.getAge(),user1.getAddress(),user1.getQq(),user1.getEmail()); } @Override public void delete(int id) { //1.定义sql String sql = "delete from user1 where id = ?"; template.update(sql, id); } }
UserService接口：
package com.example.service; import com.example.domain.User1; import java.util.List; public interface UserService { /** * 查询方法 * @return */ public List<User1> findAll(); /** * 登录方法 * @param user1 * @return */ User1 login(User1 user1); /** * 添加User1 * @param user1 */ void addUser(User1 user1); /** * 根据id删除User1 * @param id */ void deleteUser(String id); }
UserServiceImpl类：
package com.example.service.impl; import com.example.dao.UserDao; import com.example.dao.impl.UserDaoImpl; import com.example.domain.User1; import com.example.service.UserService; import java.util.List; public class UserServiceImpl implements UserService { public UserDao dao = new UserDaoImpl(); @Override public List<User1> findAll() { //调用dao完成查询 return dao.findAll(); } @Override public User1 login(User1 user1) { return dao.findUserByUsernameAndPassword(user1.getUsername(),user1.getPassword()); } @Override public void addUser(User1 user1) { dao.add(user1); } @Override public void deleteUser(String id) { dao.delete(Integer.parseInt(id));//转换为int类型 } }
DelUserServlet类：
package com.example.web.servlet; import com.example.service.UserService; import com.example.service.impl.UserServiceImpl; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.annotation.*; import java.io.IOException; @WebServlet(name = "delUserServlet", value = "/delUserServlet") public class DelUserServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.获取参数，id String id = request.getParameter("id"); //2.调用service删除 UserService service = new UserServiceImpl(); service.deleteUser(id); //3.跳转查询所有Servlet response.sendRedirect(request.getContextPath()+"/userListServlet"); } }
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