第1页 / 共6页
第2页 / 共6页
第3页 / 共6页
第4页 / 共6页
第5页 / 共6页
第6页 / 共6页
JavaWeb JDBC + MySql 通讯录实现简单的增删改查功能案例详解.pdf
JavaWeb JDBC + MySql 通讯录实现简单的增删改查功能案例详解
通讯录实现简单的增删改查功能案例详解
主要介绍了JavaWeb JDBC + MySql 通讯录实现简单的增删改查功能,结合具体案例形式详细分析了JavaWeb JDBC + MySql数据库连接、增删改查等
相关操作技巧与注意事项,需要的朋友可以参考下
本文实例讲述了JavaWeb JDBC + MySql 通讯录实现简单的增删改查功能。分享给大家供大家参考，具体如下：
开发工具：Eclipse + Navicat
项目源码：Github:https://github.com/Sunjinhang/JavaWeb
一、新建项目
一、新建项目
在Eclipse中新建一个Web项目，至于如何新建Web项目以及如何添加Tomcat服务器的就不赘述了，项目的目录如下
最终实现的效果如下所示：
点击新增可以进行联系人的新增，点击修改/删除可以进行 联系人的修改和删除
部分代码如下
数据库连接：在测试数据库连接时，需要注意mysql 时区的设置，安装mysql时默认的时区时美国时间，与本地相差8个小时，所以如果不修改则在链接数据库时会报错。
package pers.contact.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
private static final String DRIVER = "com.mysql.jdbc.Driver";
public static final String URL = "jdbc:mysql://localhost:3306/demo?rewriteBatchedStatements=true&useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&serverTimezone=GMT%2B8";
public static final String USER = "root";
public static final String PASSWORD = "sasa";
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
public void getConnection() {
try {
// 加载数据库驱动
Class.forName(DRIVER);
// 获得数据库连接
conn = DriverManager.getConnection(URL, USER, PASSWORD);
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
catch (SQLException e) {
e.printStackTrace();
}
}
public int executeUpdate(String sql, Object... obj) {
int num = 0;
getConnection();
try {
PreparedStatement pstmt = conn.prepareStatement(sql);
for (int i = 0; i < obj.length; i++) {
pstmt.setObject(i + 1, obj[i]);
}
num = pstmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll();
}
return num;
}
public ResultSet executeQuery(String sql, Object... obj) {
getConnection();
try {
PreparedStatement pstmt = conn.prepareStatement(sql);
for (int i = 0; i < obj.length; i++) {
pstmt.setObject(i + 1, obj[i]);
}
rs = pstmt.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}
public void closeAll() {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
联系人：
package pers.contact.entity;
import java.util.Date;
public class Contact {
public Contact(int id, String name, int age, String phone, Date date, String favorite) {
super();
this.id = id;
this.name = name;
this.age = age;
this.phone = phone;
this.date = date;
this.favorite = favorite;
}
private int id;
private String name;
private int age;
private String phone;
private Date date;
private String favorite;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public String getFavorite() {
return favorite;
}
public void setFavorite(String favorite) {
this.favorite = favorite;
}
}
增删改查的实现：
package pers.contact.service;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import pers.contact.entity.Contact;
import pers.contact.dao.BaseDao;;
public class ContactService extends BaseDao {
ResultSet rs = null;
public List GetAllContact(){
List list = new ArrayList();
String sql = "select * from contact";
rs = executeQuery(sql);
try {
while (rs.next()) {
Contact f = new Contact(rs.getInt(1), rs.getString(2),
rs.getInt(3), rs.getString(4), rs.getDate(5),
rs.getString(6));
list.add(f);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
public int AddContact(Contact contact)
{
int num = 0;
String sql = "insert into contact(name,age,phone,date,favorite) values(?,?,?,?,?)";
try {
num = executeUpdate(sql, contact.getName(), contact.getAge(), contact.getPhone(),
contact.getDate(), contact.getFavorite());
} catch (Exception e) {
e.printStackTrace();
}
return num;
}
public int DeleteContact(int id)
{
int num = 0;
String sql = "delete from contact where id = ?";
try {
num = executeUpdate(sql, id);
}
catch(Exception ex) {
ex.printStackTrace();
}
return num;
}
public Contact GetContact(int id) {
String sql = "select * from contact where id = ?";
Contact contact = null;
rs = executeQuery(sql, id);
try {
while(rs.next()) {
contact = new Contact(rs.getInt(1),rs.getString(2),rs.getInt(3),rs.getString(4),rs.getDate(5),rs.getString(6));
}
}
catch(SQLException ex){
ex.printStackTrace();
}
return contact;
}
public int UpdateContact(Contact contact) {
int num = 0;
String sql = "update contact set name = ?,age = ?,phone = ?,date = ?,favorite = ? where id = ?";
try {
num = executeUpdate(sql, contact.getName(),contact.getAge(),contact.getPhone(),contact.getDate(),contact.getFavorite(),contact.getId());
}
catch(Exception ex) {
ex.printStackTrace();
}
return num;
}
}
Servlet:
package pers.contact.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
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 javax.servlet.http.HttpSession;
import pers.contact.entity.Contact;
import pers.contact.service.ContactService;
/**
* Servlet implementation class ContactServlet
*/
@WebServlet("/ContactServlet")
public class ContactServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ContactServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();
PrintWriter out = response.getWriter();
ContactService ud = new ContactService();
// 获得do属性
String dos = request.getParameter("do");
if (dos == null || dos.equals("")) {
dos = "index";
}
// 主页
if (dos.equals("index")) {
List ulist = ud.GetAllContact();
request.setAttribute("ulist", ulist);
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(dos.equals("add")) {
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
String phone = request.getParameter("phone");
String dates = request.getParameter("date");
SimpleDateFormat sdf = new SimpleDateFormat("yy-MM-dd");
Date date = null;
try {
date = (Date)sdf.parse(dates);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//爱好获取
String favorite = request.getParameter("favorite");
Contact contact = new Contact(0,name,age,phone,date,favorite);
ud.AddContact(contact);
out.print("");
}
if(dos.equals("del")) {
String ids = request.getParameter("id");
int id = Integer.parseInt(ids);
ud.DeleteContact(id);
out.print("");
}
if(dos.equals("editbefore")) {
int id = Integer.parseInt(request.getParameter("id"));
Contact f = ud.GetContact(id);
session.setAttribute("edituser", f);
response.sendRedirect("edit.jsp");
return;
}
if(dos.equals("edit")) {
try {
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
String phone = request.getParameter("phone");
String dates = request.getParameter("date");
SimpleDateFormat sdf = new SimpleDateFormat("yy-MM-dd");
Date date = null;
date = (Date)sdf.parse(dates);
String favorite = request.getParameter("favorite");
Contact contact = new Contact(id,name,age,phone,date,favorite);
ud.UpdateContact(contact);
out.print("");
}
catch(ParseException ex) {
ex.printStackTrace();
}
}
}
}
JSP页面
index 页面，此页面需要添加 jstl.jar 和standard.jar ，否则无法引用 taglib
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="pers.contact.entity.Contact"%>
<%@ page import="pers.contact.service.ContactService"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
//下面的语句初始为初始化页面，如果不加下面语句访问主页不会显示数据库中保存的数据
ContactService ud = new ContactService();
List ulist = ud.GetAllContact();
request.setAttribute("ulist", ulist);
%>
Insert title here
Add页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
My JSP 'add.jsp' starting page
My JSP 'add.jsp' starting page
通讯录主页
新增小伙伴| 序号 | 姓名 | 年龄 | 电话 | 生日 | 爱好 | 操作 |
|---|---|---|---|---|---|---|
| ${U.id} | ${U.name} | ${U.age} | ${U.phone} | ${U.date} | ${U.favorite} | 修改 删除 |
新增页面
Edit页面 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %>修改页面
更多java相关内容感兴趣的读者可查看本站专题：《Java面向对象程序设计入门与进阶教程》、《Java数据结构与算法教程》、《Java操作DOM节点技巧总结》、 《Java文件与目录操作技巧汇总》和《Java缓存操作技巧汇总》 希望本文所述对大家java程序设计有所帮助。相关推荐
2023年江西萍乡中考道德与法治真题及答案.doc
2012年重庆南川中考生物真题及答案.doc
2013年江西师范大学地理学综合及文艺理论基础考研真题.doc
2020年四川甘孜小升初语文真题及答案I卷.doc
2020年注册岩土工程师专业基础考试真题及答案.doc
2023-2024学年福建省厦门市九年级上学期数学月考试题及答案.doc
2021-2022学年辽宁省沈阳市大东区九年级上学期语文期末试题及答案.doc
2022-2023学年北京东城区初三第一学期物理期末试卷及答案.doc
2018上半年江西教师资格初中地理学科知识与教学能力真题及答案.doc
2012年河北国家公务员申论考试真题及答案-省级.doc
2020-2021学年江苏省扬州市江都区邵樊片九年级上学期数学第一次质量检测试题及答案.doc
2022下半年黑龙江教师资格证中学综合素质真题及答案.doc
