<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>首页</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> <script type="text/javascript"> </script> </head> <body> <div align="center"> <a href="${pageContext.request.contextPath}/userListServlet" style="text-decoration:none;font-size:33px">查询所有用户信息 </a> </div> </body> </html>
列表查询分析:
代码实现:
1.根据数据库的创建在IDEA内创建一个实体类
private int id; private String name; private String gender; private int age; private String address; private String qq; private String email; 并生成get,set and toString
2.创建以下类和接口
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>首页</title> <!-- 1. 导入CSS的全局样式 --> <link href="css/bootstrap.min.css" rel="stylesheet"> <!-- 2. jQuery导入,建议使用1.9以上的版本 --> <script src="js/jquery-2.1.0.min.js"></script> <!-- 3. 导入bootstrap的js文件 --> <script src="js/bootstrap.min.js"></script> <script type="text/javascript"> </script> </head> <body> <div align="center"> <a href="${pageContext.request.contextPath}/userListServlet" style="text-decoration:none;font-size:33px">查询所有用户信息 </a> </div> </body> </html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@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> </head> <body> <div class="container"> <h3 style="text-align: center">用户信息列表</h3> <table border="1" class="table table-bordered table-hover"> <tr class="success"> <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="${users}" var="user" varStatus="s"> <tr> <td>${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="">删除</a></td> </tr> </c:forEach> <tr> <td colspan="8" align="center"><a class="btn btn-primary" href="add.html">添加联系人</a></td> </tr> </table> </div> </body> </html>
package cn.itcast.dao.impl; import cn.itcast.dao.UserDao; import cn.itcast.domain.User; import cn.itcast.util.JDBCUtils; 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<User> findAll() { //使用JDBC操作数据库... //1.定义sql String sql = "select * from user"; List<User> users = template.query(sql, new BeanPropertyRowMapper<User>(User.class)); return users; } } -------------------package cn.itcast.dao; import cn.itcast.domain.User; import java.util.List; /** * 用户操作的DAO */ public interface UserDao { public List<User> findAll(); }
package cn.itcast.service.impl; import cn.itcast.dao.UserDao; import cn.itcast.dao.impl.UserDaoImpl; import cn.itcast.domain.User; import cn.itcast.service.UserService; import java.util.List; public class UserServiceImpl implements UserService { private UserDao dao = new UserDaoImpl(); @Override public List<User> findAll() { //调用Dao完成查询 return dao.findAll(); } } --------------- package cn.itcast.service; import cn.itcast.domain.User; import java.util.List; /** * 用户管理的业务接口 */ public interface UserService { /** * 查询所有用户信息 * @return */ public List<User> findAll(); }
package cn.itcast.util; import com.alibaba.druid.pool.DruidDataSourceFactory; import javax.sql.DataSource; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; /** * JDBC工具类 使用Durid连接池 */ public class JDBCUtils { private static DataSource ds ; static { try { //1.加载配置文件 Properties pro = new Properties(); //使用ClassLoader加载配置文件,获取字节输入流 InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"); pro.load(is); //2.初始化连接池对象 ds = DruidDataSourceFactory.createDataSource(pro); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } /** * 获取连接池对象 */ public static DataSource getDataSource(){ return ds; } /** * 获取连接Connection对象 */ public static Connection getConnection() throws SQLException { return ds.getConnection(); } }
package cn.itcast.web.servlet; import cn.itcast.domain.User; import cn.itcast.service.UserService; import cn.itcast.service.impl.UserServiceImpl; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.List; @WebServlet("/userListServlet") public class UserListServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.调用UserService完成查询 UserService service = new UserServiceImpl(); List<User> users = service.findAll(); //2.将list存入request域 request.setAttribute("users",users); //3.转发到list.jsp request.getRequestDispatcher("/list.jsp").forward(request,response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } }
标签:784,785,itcast,cn,java,List,列表,import,public From: https://www.cnblogs.com/agzq/p/17115624.html