JavaWeb-用户注册与登录功能
JavaWeb-用户注册与登录功能
1.在数据库中创建对应的数据表
2.在src下创建domain包，并建关系映射类（JavaBean）
package com.helong.domian;
public class User {
private String uid;
private String username;
private String password;
private String phone;
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "User [uid=" + uid + ", username=" + username + ", password=" + password + ", phone=" + phone + "]";
}
}
3. 在src下引入db.properties数据库信息文件、在lib中引入相关jar包
db.properties:
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mystore?rewriteBatchedStatements=true
username=root
password=123456
maxActive=8引入相关jar包：
4.创建util工具包，并引入JdbcUtil.java文件（方便连接数据库）
package com.helong.util;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import javax.sql.DataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
public class JdbcUtil {
public static DataSource ds = null;
static {
try {
//1.加载配置文件
Properties p = new Properties();
//获取字节码目录
String path = JdbcUtil.class.getClassLoader().getResource("db.properties").getPath();
FileInputStream in = new FileInputStream(path);
p.load(in);
//ds = BasicDataSourceFactory.createDataSource(p);
ds = DruidDataSourceFactory.createDataSource(p);
}catch(Exception e) {
e.printStackTrace();
}
}
//获取数据源
public static DataSource getDataSource() {
return ds;
}
public static Connection getConn() {
try {
// 2.连接数据
return ds.getConnection();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 关闭资源
*/
public static void close(Connection conn,Statement st,ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (st != null) {
try {
st.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
5.前端界面
用户注册界面：
用户登录界面：
6.后台Servlet
提供成语Servlet：
package com.helong.servlet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/CheckCodeServlet")
public class CheckCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// 集合中保存所有成语
private List words = new ArrayList();
@Override
public void init() throws ServletException {
// 初始化阶段，读取new_words.txt
// web工程中读取 文件,必须使用绝对磁盘路径
String path = getServletContext().getRealPath("/WEB-INF/words.txt");
try {
BufferedReader reader = new BufferedReader(new FileReader(path));
String line;
//把读的成语全部添加到一个集合当中
while ((line = reader.readLine()) != null) {
words.add(line);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 禁止缓存
response.setHeader("Cache-Control", "no-cache");
//设置过期时间为立即过期
response.setDateHeader("Expires", 0);
int width = 120;
int height = 30;
// 步骤一 绘制一张内存中图片
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 步骤二 图片绘制背景颜色 ---通过绘图对象
Graphics graphics = bufferedImage.getGraphics();// 得到画图对象 --- 画笔
// 绘制任何图形之前 都必须指定一个颜色
graphics.setColor(getRandColor(200, 250));
graphics.fillRect(0, 0, width, height);
// 步骤三 绘制边框
graphics.setColor(Color.WHITE);
graphics.drawRect(0, 0, width - 1, height - 1);
// 步骤四 四个随机数字
Graphics2D graphics2d = (Graphics2D) graphics;
// 设置输出字体
graphics2d.setFont(new Font("宋体", Font.BOLD, 18));
Random random = new Random();// 生成随机数
int index = random.nextInt(words.size());
String word = words.get(index);// 获得成语
System.out.println(word);
// 定义x坐标
int x = 10;
for (int i = 0; i < word.length(); i++) {
// 随机颜色
graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 旋转 -30 --- 30度
int jiaodu = random.nextInt(60) - 30;
// 换算弧度
double theta = jiaodu * Math.PI / 180;
// 获得字母数字
char c = word.charAt(i);
// 将c 输出到图片
graphics2d.rotate(theta, x, 20);
graphics2d.drawString(String.valueOf(c), x, 20);
graphics2d.rotate(-theta, x, 20);
x += 30;
}
// 将验证码内容保存session
//request.getSession().setAttribute("checkcode_session", word);
//把生成的验证码存放到全局域对象当中
this.getServletContext().setAttribute("checkCode", word);
// 步骤五 绘制干扰线
graphics.setColor(getRandColor(160, 200));
int x1;
int x2;
int y1;
int y2;
for (int i = 0; i < 30; i++) {
x1 = random.nextInt(width);
x2 = random.nextInt(12);
y1 = random.nextInt(height);
y2 = random.nextInt(12);
graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
}
// 将上面图片输出到浏览器 ImageIO
graphics.dispose();// 释放资源
//将图片写到response.getOutputStream()中
ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
/**
* 取其某一范围的color
*
* @param fc
* int 范围参数1
* @param bc
* int 范围参数2
* @return Color
*/
private Color getRandColor(int fc, int bc) {
// 取其随机颜色
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}
注册界面Servlet:
package com.helong.servlet;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;
import java.util.Map;
import java.util.UUID;
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 org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.dbutils.QueryRunner;
import com.myxq.domian.User;
import com.myxq.util.JdbcUtil;
/**
* Servlet implementation class RegistServlet
*/
@WebServlet("/RegistServlet")
public class RegistServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置请求编码 与响应的编码（只有POST请求可以这样来设置接收参数的编码方式）
request.setCharacterEncoding("utf-8");
/*设置响应给定浏览器编码方式*/
response.setContentType("text/html;charset=utf-8");
//获取参数 验证码(用户输入的验证码)
String code = request.getParameter("code");
System.out.println("code="+code);
//获取服务器生成的验证码
String word = (String) this.getServletContext().getAttribute("checkCode");
//判断输入的验证
if(code.equals(word)) {
//如果正确
//1.接收所有参数
Map parameterMap = request.getParameterMap();
User u = new User();
try {
//2.把接收的参数封装成User对象
BeanUtils.populate(u, parameterMap);
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
//3.设置uid(为用户注册的用户提供唯一的ID)
u.setUid(UUID.randomUUID().toString());
//4.写入到数据库
QueryRunner qr = new QueryRunner(JdbcUtil.getDataSource());
String sql ="insert into user value(?,?,?,?)";
try {
qr.update(sql,u.getUid(),u.getUsername(),u.getPassword(),u.getPhone());
} catch (SQLException e) {
e.printStackTrace();
}
response.getWriter().write("注册成功");
//跳转到登录
response.setHeader("refresh", "3;url=/28-Mystore/login.html");
}else {
//不正确 ，告诉用户验证码错误，跳转回注册页
response.getWriter().write("验证码错误");
response.setHeader("refresh", "3;url=/28-Mystore/regist.html");
}
}
}
登录界面Servlet:
package com.helong.servlet;
import java.io.IOException;
import java.sql.SQLException;
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 org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import com.myxq.domian.User;
import com.myxq.util.JdbcUtil;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取用户名， 密码
String name = request.getParameter("username");
String pwd = request.getParameter("password");
System.out.println(name+":"+pwd);
//到数据库当中查询有没有该用户
QueryRunner qr = new QueryRunner(JdbcUtil.getDataSource());
String sql = "select * from user where username=? and password=?";
User u = null;
try {
/*BeanHandler是将从数据库中查询到的数据封装成一个User对象 返回的对象也为User对象*/
u = qr.query(sql, new BeanHandler(User.class),name,pwd);
} catch (SQLException e) {
e.printStackTrace();
}
response.setContentType("text/html;charset=utf-8");
//1.有值
if(u != null) {
response.getWriter().write("登录成功");
//跳转到主界面
response.setHeader("refresh", "3;url=/28-Mystore/index.html");
}else {
response.getWriter().write("登录失败");
//跳转到登录
response.setHeader("refresh", "3;url=/28-Mystore/login.html");
}
}
}