自己封装的验证码工具类以及登录验证

1.验证码CreateYZMCodeUtils工具类

package com.han.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;
/**
* 生成验证码的工具类
* 自己封装的
* @author issuser
*
*/
public class CreateYZMCodeUtils {
private Integer width;//验证码图片宽度
private Integer height;//验证吗图片高度
private Integer num;//验证码的个数
private String code;//生成验证码一组字符串

private static final Random ran=new Random();//随机数
private static CreateYZMCodeUtils createYZMCodeUtils;
/**
* 通过默认构造初始化参数
*/
private CreateYZMCodeUtils(){
width=100;
height=30;
code="123456789adcdefghijklmnopqrstuvwxyz";
num=4;
}
/**
* 利用单利模式创建该验证码工具类
* @return
*/
public static CreateYZMCodeUtils getInstance(){
if(createYZMCodeUtils==null){
createYZMCodeUtils=new CreateYZMCodeUtils();
}
return createYZMCodeUtils;
}
public Integer getWidth() {
return width;
}

public void setWidth(Integer width) {
this.width = width;
}

public Integer getHeight() {
return height;
}

public void setHeight(Integer height) {
this.height = height;
}

public Integer getNum() {
return num;
}

public void setNum(Integer num) {
this.num = num;
}

public String getCode() {
return code;
}

public void setCode(String code) {
this.code = code;
}

public static Random getRan() {
return ran;
}
public void setCreateYZMCodeUtils(Integer width,Integer height,Integer num,String code){
this.width=width;
this.height=height;
this.num=num;
this.code=code;
}
public void setCreateYZMCodeUtils(Integer width,Integer height,String code){
this.width=width;
this.height=height;
this.code=code;
}
/**
* 随机生成验证码
* @param code 生成验证码的一组字符串
* @return
*/
public String getCreateYZMCode(){
StringBuffer sb = new StringBuffer();
for (int i = 0; i < num; i++) {
sb.append(code.charAt(ran.nextInt(code.length())));
}
return sb.toString();
}
/**
* 生成buffere Image图片
* @param finshCode 生成好的验证码字符串
* @return
*/
public BufferedImage getCreateYZMImg(String finshCode){
// 创建BufferedImage对象
BufferedImage img = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = img.createGraphics();// 创建画笔
graphic.setColor(Color.WHITE);// 设置颜色
graphic.fillRect(0, 0, width, height);//是用预定的颜色填充一个矩形，得到一个着色的矩形块。
graphic.setColor(Color.black);
graphic.drawRect(0, 0, width - 1, height - 1);// 画正方形
// 设置字体 风格 风格 高度
Font font = new Font("宋体", Font.BOLD + Font.ITALIC,(int) (height * 0.8));
graphic.setFont(font);
for (int i = 0; i < num; i++) {
// 随机设置字体RGB颜色
graphic.setColor(new Color(ran.nextInt(255), ran.nextInt(255),ran.nextInt(255)));
// 画出验证码
graphic.drawString(String.valueOf(finshCode.charAt(i)), i* (width / num) + 4, (int) (height * 0.8));
}
for (int i = 0; i < (width + height); i++) {
// 随机设置字体RGB颜色
graphic.setColor(new Color(ran.nextInt(255), ran.nextInt(255),ran.nextInt(255)));
// 生成干扰点
graphic.drawOval(ran.nextInt(width), ran.nextInt(height), 1, 1);
}
for(int i = 0; i <2; i++){
// 随机设置字体RGB颜色
graphic.setColor(new Color(ran.nextInt(255), ran.nextInt(255),ran.nextInt(255)));
// 随机生成干扰线
graphic.drawLine(0, ran.nextInt(height), width,ran.nextInt(height));
}
return img;
}
}


2.Controller控制器的调用
package com.han.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.han.model.User;
import com.han.service.UserServ;
import com.han.util.CreateYZMCodeUtils;
import com.han.util.Md5Utils;

@Controller
public class AdminController {
@Resource(name="userServ")
private UserServ userServ;
@RequestMapping("/admin")
public String index() {
return "admin/index";
}

/**
* 跳转至登录页面
*
* @return
*/
@RequestMapping(value = "/login", method = RequestMethod.GET)
public String login() {
return "admin/login";
}
/**
* 验证登录
* @param username 用户名
* @param password 登录密码
* @param checkCode 验证码
* @param session
* @return
*/
@RequestMapping(value = "/login", method = RequestMethod.POST)
public String login(String username,String password,String checkCode,HttpSession session,Model model) {
String code=(String) session.getAttribute("code");
User user = this.userServ.loadByUserName(username);
if(user==null){
model.addAttribute("userError", "用户名或密码不正确！");
return "admin/login";
}
//验证密码
String md5 = Md5Utils.Md5(password);
if(!user.getPassword().equals(md5)){
model.addAttribute("userError", "用户名或密码不正确！");
return "admin/login";
}
if(code!=null && !code.equals(checkCode)){
model.addAttribute("codeError", "验证码不正确，请重新输入！");
return "admin/login";
}
session.setAttribute("loginUser", user);
return "redirect:/admin";
}

/**
* 生成验证码图片
*
* @param response
* @param session
*/
@RequestMapping("/createYZM")
public void createYZM(HttpServletResponse response, HttpSession session) {
OutputStream out = null;
try {
// 设置响应类型
response.setContentType("image/jpg");
// 获取创建验证码工具类实例
CreateYZMCodeUtils yzm = CreateYZMCodeUtils.getInstance();
// 获取生成的验证码字符串
String code = yzm.getCreateYZMCode();
// 将验证码存放在session
session.setAttribute("code", code);
// 获取验证码图片
BufferedImage img = yzm.getCreateYZMImg(code);
out = response.getOutputStream();
// 通过ImageIO写出图片
ImageIO.write(img, "jpg", out);
out.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}


3.jsp登录页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="<%=request.getContextPath() %>/resources/css/admin/login.css"/>
<script type="text/javascript" src="<%=request.getContextPath() %>/resources/js/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="<%=request.getContextPath() %>/resources/js/jquery.validate.js"></script>
<script type="text/javascript" src="<%=request.getContextPath() %>/resources/js/core/jquery.cms.validate.js"></script>
<title>后台管理登录</title>
<script type="text/javascript">
$(function(){
$("#myForm").cmsvalidate();
});
function reCheckcode(img) {
//后面跟一个随机数方便每次请求都是一个新的请求，刷新验证码，防止会在缓存中去验证码图片
img.src="createYZM?"+Math.random();
}

</script>
</head>
<body>
<div id="container">
<div id="top">

</div>
<div id="content">
<div id="loginForm">
<p style="color: red;margin-left: 98px">${userError}</p>
<form action="" id="myForm" method="post">
<table cellpadding="0" cellspacing="0" width="380px" id="loginTable">
<tr>
<td align="right" width="90">登录用户:</td>
<td align="left"><input type="text" name="username" size="18"/> </td>
</tr>
<tr>
<td align="right">登录密码:</td>
<td align="left"><input type="password" name="password" size="18"/></td>
</tr>
<tr>
<td align="right">验证码:</td>
<td align="left">
<input type="text" name="checkCode" id="validateCode" size="10"/>
${codeError}
</td>
</tr>
<tr>
<td align="left" colspan="2">
<span style="margin-left:94px;cursor:pointer">
<img src="createYZM" onclick="reCheckcode(this)"/></span>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="submit" value="登录">   <input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</div>
</div>
</div>
</body>
</html>