javaWeb项目jdbc+servlet+jsp+mysql人员管理系统
一、
所需:IDEA
Tmocat (没有可以官网下载)
Mysql
JDBC
package com.wuyunlong.util;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
//操作数据库的公共类
public class BaseDao {
private static String driver;
private static String url;
private static String username;
private static String password;
//静态代码块，类加载的时候就初始化了
static {
Properties params=new Properties();
InputStream is=BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
try {
params.load(is);
} catch (IOException e) {
e.printStackTrace();
}
driver=params.getProperty("driver");
url=params.getProperty("url");
username=params.getProperty("username");
password=params.getProperty("password");
}
//获取数据库的链接
public static Connection getConnection(){
Connection connection = null;
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, username, password);
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
//编写查询公共方法
public static ResultSet execute(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet,String sql,Object[] params) throws SQLException {
//预编译的sql，在后面直接执行就可以了
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
resultSet = preparedStatement.executeQuery();
return resultSet;
}
//编写增删改公共方法
public static int execute(Connection connection,PreparedStatement preparedStatement,String sql,Object[] params) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
int updateRows = preparedStatement.executeUpdate();
return updateRows;
}
//释放资源
public static boolean closeResource(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){
boolean flag = true;
if (resultSet!=null){
try {
resultSet.close();
//GC回收
resultSet = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
if (preparedStatement!=null){
try {
preparedStatement.close();
//GC回收
preparedStatement = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
if (connection!=null){
try {
connection.close();
//GC回收
connection = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
return flag;
}
}
配置jdbc.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mdb1?useUnicode=true&characterEncoding=utf-8
username=root
password=admin
更改自己对应的：数据库 账户和密码
创建servlet(Web层) service（业务层） dao（持久层）bean(实体类) util(三方工具类存放JDBC)
创建bean层userBean表实体类
package com.wuyunlong.pojo;
public class User {
private int uid;
private String usercode;
private String userpassword;
private String age;
private String address;
private String gender;
public User() {
}
public User(int uid, String usercode, String userpassword, String age, String address, String gender) {
this.uid = uid;
this.usercode = usercode;
this.userpassword = userpassword;
this.age = age;
this.address = address;
this.gender = gender;
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUsercode() {
return usercode;
}
public void setUsercode(String usercode) {
this.usercode = usercode;
}
public String getUserpassword() {
return userpassword;
}
public void setUserpassword(String userpassword) {
this.userpassword = userpassword;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
}
servlet:登录请求
package com.wuyunlong.servlet;
import com.wuyunlong.pojo.User;
import com.wuyunlong.service.UserService;
import com.wuyunlong.service.UserServiceImpl;
import com.wuyunlong.util.Constants;
import org.junit.Test;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
UserService userService = new UserServiceImpl();
User user = userService.login(userCode, userPassword);//查询出登录的人
List all= userService.findll();
req.setAttribute("findAll",all);
if(user!=null){ //查有此人可以登录
//将用户信息放到session中
req.getSession().setAttribute(Constants.USER_SESSINO,user);
//跳转页面
this.findall(req,resp);
//resp.sendRedirect("main.jsp");
}else {
req.setAttribute("error","用户名或者密码错误,请先注册");
req.getRequestDispatcher("login.jsp").forward(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
protected void findall(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
UserService us = new UserServiceImpl();
List all = us.findll();
req.setAttribute("all",all);
//req.setAttribute("findAll",all);
req.getRequestDispatcher("main.jsp").forward(req,resp);
}
}
service
接口：UserService
public User login(String userCode,String password );实现类：UserServiceImpl
private UserDao userDao;
public UserServiceImpl() {
userDao=new UserDaoImpl();
}
//登录
public User login(String userCode, String userPassword) {
Connection connection=null;
User user=null;
try {
connection = BaseDao.getConnection();
//通过业务层调用对应的具体的数据库操作
user= userDao.getLoginUser(connection,userCode,userPassword);
} catch (SQLException e) {
e.printStackTrace();
} finally {
BaseDao.closeResource(connection,null,null);
}
return user;
}Dao
接口：UserServlet
public User getLoginUser(Connection connection, String userCode,String userPassword) throws SQLException;实现类：UserServletImpl
//登陆查询
public User getLoginUser(Connection connection, String userCode,String userPassword) throws SQLException {
{
PreparedStatement pstm = null;
ResultSet rs = null;
User user = null;
if (connection != null) {
String sql = "select * from user where usercode=? ";
Object[] params = {userCode};
rs = BaseDao.execute(connection, pstm, rs, sql, params);
if (rs.next()) {
//通过usercode查询 返回整个数组
user = new User();
user.setUid(rs.getInt("uid"));
user.setUsercode(rs.getString("usercode"));
user.setUserpassword(rs.getString("userpassword"));
user.setAge(rs.getString("age"));
user.setAddress(rs.getString("address"));
user.setGender(rs.getString("gender"));
if (!user.getUserpassword().equals(userPassword)){
user=null;}
}
BaseDao.closeResource(null, pstm, rs);
}
return user;
}
}注册Servlet
登陆页面：login.jsp
登陆成功（主页面）：main.jsp
只上传了登录功能
废话不多说
