本文接着上一篇，继续为大家分享了JavaWeb实现学生信息管理系统的第二篇，供大家参考，具体内容如下
今日任务：实现学生管理系统的查找和添加功能！
一、查询学生信息
1. index.jsp
先写一个JSP页面【WebContent/index.jsp】，里面放一个超链接
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<a href="StudentListServlet" rel="external nofollow" >显示所有学生列表</a> |
2. StudentListServlet.java
写StudentListServlet【com.servlet包下的StudentListServlet.java】，接受请求，去调用service，再由service调用dao
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package com.servlet;import java.io.IOException;import java.sql.SQLException;import java.util.List;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 com.domain.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;/** * * 负责查询所有的学生信息，然后呈现到list.jsp页面上 * */@WebServlet("/StudentListServlet")public class StudentListServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { //1.查询出来所有的学生 StudentService service = new StudentServiceImpl(); List<Student> list = service.findAll(); //2.先把数据存储到作用域中 //3..跳转页面 } catch (SQLException e) { e.printStackTrace(); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }} |
3. StudentDao.java & StudentDaoImpl.java
3.1 StudentDao.java【com.dao包下】
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package com.dao;import java.sql.SQLException;import java.util.List;import com.domain.Student;/** * 这是针对学生表的数据访问 * @author Administrator * */public interface StudentDao { /** * 查询所有学生 * @return List<Student> */ List<Student> findAll() throws SQLException;} |
3.2 StudentDaoImpl.java【com.dao.impl包下】
实现StudentDao里的findAll()方法。
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public class StudentDaoImpl implements StudentDao { /** * 查询所有学生 * @throws SQLException */ @Override public List<Student> findAll() throws SQLException { QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource()); String sql = "select * from stu"; List<Student> list = runner.query(sql, new BeanListHandler<Student>(Student.class)); return list; }} |
4. StudentService.java 和 StudentService.java
4.1 StudentService.java
代码同StudentDao.java,
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public interface StudentService { /** * 查询所有学生 * @return List<Student> * */ List<Student> findAll() throws SQLException;} |
4.2 StudentService.java
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public class StudentServiceImpl implements StudentService{ @Override public List<Student> findAll() throws SQLException { StudentDao dao = new StudentDaoImpl(); return dao.findAll(); } } |
5. 在StudentListServlet存储数据，并作出页面响应
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//2.先把数据存储到作用域中request.setAttribute("list", list); //3..跳转页面request.getRequestDispatcher("list.jsp").forward(request, response); |
6. list.jsp
在list.jsp【WebContent/list.jsp】上显示数据。
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE html><html><head><meta charset="UTF-8"><title>学生列表页面 </title></head><body> <table border="1" width="700"> <tr> <td colspan="8"> <a href="add.jsp" rel="external nofollow" >添加</a> </td> </tr> <tr align="center"> <td>编号</td> <td>姓名</td> <td>性别</td> <td>电话</td> <td>生日</td> <td>爱好</td> <td>简介</td> <td>操作</td> </tr> <c:forEach items="${list }" var="stu"> <tr align="center"> <td>${stu.sid }</td> <td>${stu.sname }</td> <td>${stu.gender }</td> <td>${stu.phone }</td> <td>${stu.birthday }</td> <td>${stu.hobby }</td> <td>${stu.info }</td> <td><a href="#" rel="external nofollow" rel="external nofollow" >更新</a> <a href="#" rel="external nofollow" rel="external nofollow" >删除</a></td> </tr> </c:forEach> </table></body></html> |
7. 查找结果如下：
二、添加学生信息
1. add.jsp
我们需要先跳转到增加页面，编写增加页面add.jsp【WebContent/add.jsp】
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<body> <h3>添加学生页面</h3> <form action="AddServlet" method="post"> <table border="1" width="600"> <tr> <td>姓名</td> <td><input type="text" name="sname"></td> </tr> <tr> <td>性别</td> <td> <input type="radio" name="gender" value="男">男 <input type="radio" name="gender" value="女">女 </td> </tr> <tr> <td>电话</td> <td><input type="text" name="phone"></td> </tr> <tr> <td>生日</td> <td><input type="text" name="birthday"></td> </tr> <tr> <td>爱好</td> <td> <input type="checkbox" name="hobby" value="游泳">游泳 <input type="checkbox" name="hobby" value="篮球">篮球 <input type="checkbox" name="hobby" value="足球">足球 <input type="checkbox" name="hobby" value="看书">看书 <input type="checkbox" name="hobby" value="写字">写字 </td> </tr> <tr> <td>简介</td> <td> <textarea rows="3" cols="20" name="info"></textarea> </td> </tr> <tr> <td colspan="2"><input type="submit" value="添加"></td> </tr> </table> </form> </body> |
实现结果如下：
2. AddServlet.java
点击添加，提交数据到AddServlet，处理数据。
【备：com.servlet包下的AddServlet.java】
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); try { //1.获取客户端提交上来的数据 String sname = request.getParameter("sname"); String gender = request.getParameter("gender"); String phone = request.getParameter("phone"); String birthday = request.getParameter("birthday"); //传过来是1989-10-18 String info = request.getParameter("info"); //String hobby = request.getParameter("hobby"); String [] h = request.getParameterValues("hobby"); //[篮球，足球，写字]-----篮球，足球，写字 String hobby = Arrays.toString(h); hobby = hobby.substring(1,hobby.length()-1); //2.添加到数据库 //String-------Date Date date = new SimpleDateFormat("yyyy-MM-dd").parse(birthday); Student student = new Student(sname,gender,phone,hobby,info,date); StudentService service = new StudentServiceImpl(); service.insert(student); //3.跳转到列表页 //这里是直接跳转到页面上，那么这个页面会重新翻译一次，上面那个request里面的数据就没有了 //request.getRequestDispatcher("list.jsp").forward(request, response); //servlet除了能跳jsp之外，还能跳servlet request.getRequestDispatcher("StudentListServlet").forward(request, response); } catch (Exception e) { e.printStackTrace(); } } |
3. StudentDao & StudentService
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/** * 添加学生 * @param student 需要添加到数据库的学生对象 * @throws SQLException */void insert(Student student) throws SQLException; |
4. Dao & Service的实现
4.1 StudentDaoImpl.java
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@Overridepublic void insert(Student student) throws SQLException { QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource()); String sql = "insert into stu values(null,?,?,?,?,?,?)"; runner.update(sql, student.getSname(), student.getGender(), student.getPhone(), student.getBirthday(), student.getHobby(), student.getInfo() );} |
4.2 StudentServiceImpl.java
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@Override public void insert(Student student) throws SQLException { StudentDao dao = new StudentDaoImpl(); dao.insert(student); } |
5. 注意
完成了上述存储工作之后，需要跳转到列表页面，这里不能直接跳转到列表页面，否则没有什么内容显示。应该先跳转到查询所有学生信息的那个servlet，即StudentListServlet，再由这个servlet跳转到列表页面。
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request.getRequestDispatcher("StudentListServlet").forward(request, response); |
hobby的value有多个值。处理时需多次转化：
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//String hobby = request.getParameter("hobby");String [] h = request.getParameterValues("hobby");//[篮球，足球，写字]-----篮球，足球，写字String hobby = Arrays.toString(h);hobby = hobby.substring(1,hobby.length()-1); |
6. 添加结果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/weixin_44270855/article/details/104223040
