登陆页面（附自动刷新验证码）
最近闲来无事，就用idea写了一个简单的登陆页面，仅供自学java代码的java初学者，以下是我的源码，包括简单的前端代码：
按照MVC，先来javaBean代码
package com.test.bean;
/**
* 包名:com.test.bean
* 作者:David
* 日期:2018/7/16 15:42
**/
public class Student {
private int id;
private String name;
private String password;
private String love;
public Student(int id, String name, String password, String love) {
this.id = id;
this.name = name;
this.password = password;
this.love = love;
}
public Student() {
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", password='" + password + '\'' +
", love='" + love + '\'' +
'}';
}
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 String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getLove() {
return love;
}
public void setLove(String love) {
this.love = love;
}
}业务层：
package com.test.service;
import com.test.bean.Student;
import com.test.dao.checkDao;
/**
* 包名:com.test.service
* 作者:David
* 日期:2018/7/16 16:21
**/
public class checkService {
public Student check(String name, String password, String love) {
checkDao dao = new checkDao();
Student student = null;
try {
student = dao.check(name,password,love);
} catch (Exception e) {
e.printStackTrace();
}
return student;
}
}
dao层：
package com.test.dao;
import com.test.bean.Student;
import com.test.utils.JDBCUtilDruid;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
/**
* 包名:com.test.dao
* 作者:David
* 日期:2018/7/16 16:24
**/
public class checkDao {
public Student check(String name, String password, String love) throws Exception {
JdbcTemplate template = new JdbcTemplate(JDBCUtilDruid.getDataSource());
String sql = "select * from student where name=? and password=? and love=?";
Student student = template.queryForObject(sql, new BeanPropertyRowMapper<>(Student.class), name, password, love);
return student;
}
}
servlet层：（登陆）
package com.test.web.servlet;
import com.test.bean.Student;
import com.test.service.checkService;
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;
/**
* 包名:${PACKAGE_NAME}
* 作者:David
* 日期:2018/7/16 15:47
**/
@WebServlet(name = "loginServlet", urlPatterns ="/login")
public class loginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
String password = request.getParameter("password");
String love = request.getParameter("love");
String codeName = request.getParameter("codeName");
String codeSession = (String) request.getSession().getAttribute("codeSession");
if (codeName.equalsIgnoreCase( codeSession)){
checkService service = new checkService();
Student student = service.check(name,password,love);
if (student != null){
request.setAttribute("student",student);
request.getRequestDispatcher("welcome.jsp").forward(request,response);
}
else {
request.setAttribute("msg","用户信息错误，请从新输入");
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}
else {
request.setAttribute("codeMsg","验证码错误");
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}
}
验证码：
package com.test.web.servlet;
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;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
@WebServlet(urlPatterns = "/codeTest")
public class CheckcodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 创建画布
int width = 120;
int height = 40;
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 获得画笔
Graphics g = bufferedImage.getGraphics();
// 填充背景颜色
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
// 绘制边框
g.setColor(Color.red);
g.drawRect(0, 0, width - 1, height - 1);
// 生成随机字符
// 准备数据
String data = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
// 准备随机对象
Random r = new Random();
// 声明一个变量 保存验证码
String code = "";
// 书写4个随机字符
for (int i = 0; i < 4; i++) {
// 设置字体
g.setFont(new Font("宋体", Font.BOLD, 28));
// 设置随机颜色
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
String str = data.charAt(r.nextInt(data.length())) + "";
g.drawString(str, 10 + i * 28, 30);
// 将新的字符 保存到验证码中
code = code + str;
}
// 绘制干扰线
for (int i = 0; i < 6; i++) {
// 设置随机颜色
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));
}
// 将验证码 打印到控制台
System.out.println(code);
// 将验证码放到session中
request.getSession().setAttribute("codeSession", code);
// 将画布显示在浏览器中
ImageIO.write(bufferedImage, "jpg", response.getOutputStream());
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
使用过滤器，解决所有请求响应的中文乱码：
package com.test.web.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* 包名:${PACKAGE_NAME}
* 作者:David
* 日期:2018/7/16 15:45
**/
@WebFilter(filterName = "encodeFilter",urlPatterns = "/*")
public class encodeFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
chain.doFilter(req, resp);
}
public void init(FilterConfig config) throws ServletException {
}
}
自定义一个druid连接池工具类：
package com.test.utils;
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.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/**
* 包名:com.itheima.utils
* 作者:Leevi
* 日期2018-06-21 17:55
*/
public class JDBCUtilDruid {
private static DataSource ds;
static {
InputStream in = null;
try {
Properties properties = new Properties();
in = JDBCUtilDruid.class.getResourceAsStream("/druidconfig.properties");
properties.load(in);
ds = DruidDataSourceFactory.createDataSource(properties);
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static DataSource getDataSource(){
return ds;
}
public static Connection getConnection() throws SQLException {
//从Druid连接池中获取连接对象
return ds.getConnection();
}
public static void close(Statement stm, Connection conn) throws SQLException {
if (stm != null) {
stm.close();
}
if (conn != null) {
conn.close();
}
}
public static void close(ResultSet rst, Statement stm, Connection conn) throws SQLException {
if (rst != null) {
rst.close();
}
close(stm,conn);
}
public static void main(String[] args) throws SQLException {
//要使用Druid连接池获取一个连接
Connection conn = JDBCUtilDruid.getConnection();
//怎么将conn还到池子中
conn.close();
}
}
三个简单的前端页面：首页，登陆，欢迎页面
%--一：
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/7/16
Time: 15:28
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
首页
你好，欢迎来到英雄联盟
点击进入登陆页面
二：
%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/7/16
Time: 15:48
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
登陆页面
${msg}
${codeMsg}
三：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
欢迎页面
欢迎${student.name}来到召唤师峡谷
所需所有jar包：
commons-beanutils-1.8.3.jar
commons-logging-1.1.1.jar
druid-1.0.9.jar
javax.servlet.jsp.jstl.jar
jstl-impl.jar
mysql-connector-java-5.1.18-bin.jar
spring-beans-4.2.4.RELEASE.jar
spring-core-4.2.4.RELEASE.jar
spring-jdbc-4.2.4.RELEASE.jar
spring-tx-4.2.4.RELEASE.jar
druid配置文件：
druidconfig.properties