import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
/**
* Created by Wzy
* on 2018/5/11
*/
public class VerifyCodeUtils {
//使用到Algerian字体,系统里没有的话需要安装字体,字体只显示大写,去掉了1,0,i,o几个容易混淆的字符
public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
private static Random random = new Random();
/**
* 使用系统默认字符源生成验证码
*
* @param verifySize 验证码长度
* @return
*/
public static String generateVerifyCode(int verifySize) {
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
*
* @param verifySize 验证码长度
* @param sources 验证码字符源
* @return
*/
public static String generateVerifyCode(int verifySize, String sources) {
if (sources == null || sources.length() == 0) {
sources = VERIFY_CODES;
}
int codesLen = sources.length();
Random rand = new Random(System.currentTimeMillis());
StringBuilder verifyCode = new StringBuilder(verifySize);
for (int i = 0; i < verifySize; i++) {
verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
}
return verifyCode.toString();
}
/**
* 输出指定验证码图片流
*
*/
public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {
int verifySize = code.length();
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand = new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors = new Color[5];
Color[] colorSpaces = new Color[]{Color.WHITE, Color.CYAN,
Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
Color.PINK, Color.YELLOW};
float[] fractions = new float[colors.length];
for (int i = 0; i < colors.length; i++) {
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
g2.setColor(Color.GRAY);// 设置边框色
g2.fillRect(0, 0, w, h);
Color c = getRandColor(200, 250);
g2.setColor(c);// 设置背景色
g2.fillRect(0, 2, w, h - 4);
//绘制干扰线
Random random = new Random();
g2.setColor(getRandColor(160, 200));// 设置线条的颜色
for (int i = 0; i < 20; i++) {
int x = random.nextInt(w - 1);
int y = random.nextInt(h - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g2.drawLine(x, y, x + xl + 40, y + yl + 20);
}
// 添加噪点
float yawpRate = 0.05f;// 噪声率
int area = (int) (yawpRate * w * h);
for (int i = 0; i < area; i++) {
int x = random.nextInt(w);
int y = random.nextInt(h);
int rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
shear(g2, w, h, c);// 使图片扭曲
g2.setColor(getRandColor(100, 160));
int fontSize = h - 4;
Font font = new Font("Algerian", Font.ITALIC, fontSize);
g2.setFont(font);
char[] chars = code.toCharArray();
for (int i = 0; i < verifySize; i++) {
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
private static Color getRandColor(int fc, int bc) {
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);
}
private static int getRandomIntColor() {
int[] rgb = getRandomRgb();
int color = 0;
for (int c : rgb) {
color = color << 8;
color = color | c;
}
return color;
}
private static int[] getRandomRgb() {
int[] rgb = new int[3];
for (int i = 0; i < 3; i++) {
rgb[i] = random.nextInt(255);
}
return rgb;
}
private static void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private static void shearX(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(2);
boolean borderGap = true;
int frames = 1;
int phase = random.nextInt(2);
for (int i = 0; i < h1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
if (borderGap) {
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
}
private static void shearY(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(40) + 10; // 50;
boolean borderGap = true;
int frames = 20;
int phase = 7;
for (int i = 0; i < w1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
if (borderGap) {
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
/**
* 获取随机验证码及其加密图片
*
*/
public static String VerifyCode(int w, int h, int size) throws IOException {
BASE64Encoder encoder = new BASE64Encoder();
String code = generateVerifyCode(size).toLowerCase();
ByteArrayOutputStream data = new ByteArrayOutputStream();
outputImage(w, h, data, code);
return encoder.encode(data.toByteArray());
}
/**
* 生成验证码图片
* @param w
* @param h
* @param code
* @return
* @throws IOException
*/
public static String verifyCode(int w, int h, String code ) throws IOException {
//base64编码
BASE64Encoder encoder = new BASE64Encoder();
//byte数组的流,用来装图片的
ByteArrayOutputStream data = new ByteArrayOutputStream();
//把验证码的值合并成一个图片,写到 data ,流里面
outputImage(w, h, data, code);
//对图片进行base64编码
return encoder.encode(data.toByteArray());
}
public static void main(String[] args) throws Exception{
System.out.println(VerifyCode(100, 30, 6));
}
}
注意:图片的验证码应该存在redis
//创建图片验证码
@Override
public String createImageCode(String imageCodeKey) {
//判断这个图片的key是否为空
if(!StringUtils.hasLength(imageCodeKey)){
throw new RuntimeException("无效的imageCodeKey");
}
//使用uuid生成前台展示的随机数
String imageCodeValue = UUID.randomUUID().toString().substring(0, 4);
//将传来的值当做key,生成的随机数当成value,存到redis
AjaxResult ajaxResult = redisFeign.setex(imageCodeKey, 300, imageCodeValue);
try {
//直接攻击类就能完成使用
//4.把验证码的值合并成图片
//5.把图片进行base64编码
//6.返回编码后的字符串
return VerifyCodeUtils.verifyCode(135,40,imageCodeValue);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
手机验证码也应该存在redis
一.发送手机验证码
需求分析:
1.两次发送验证码频繁判断 : 当前次发送时间 - 上一次发送时间 > 60s
方案 :保存每次发送验证码的记录?
1.存储到哪儿Redis ?
2.存储哪些东西?时间,验证码的值,手机号 ?
3.设置key过期时间5分钟?
4.以什么作为key? 前缀:手机 -> SMS:18244444444
2.判断图片验证码是否正确
1.参数传入:输入的图片验证码的值 , 和浏览器存储的图片验证码的key ,手机号
2.后台根据key取出redis中的图片验证码的值和前台提交的值对比
后台逻辑
//1.参数基本判断
//2.校验图片验证码===============================================
//2.1.根据参数中的key,从Redis中获取图片验证码的值
//2.2.redis中的图片验证码的值和参数中的验证码的值比较
//3.获取上一次验证码发送记录
//3.1.如果上一次有
//3.1.1.判断上一次发送发送时间和当前时间要大于 60s,-> 使用上一次发送验证码继续发
//3.2.如果上一次没有
//3.2.1.创建新的验证码
//4.存储验证码发送记录到Redis(或者覆盖:改时间)
//5.调用三方短信网关,发送短信
//6.存储发送记录到MYSQL,作为平台统计,监控的依据
service层处理短信验证码
//短信验证码的判断
@Override
public void sendSmsCode(Map<String, String> map) {
//判断传来的参数是否为空
String imageCodeKey = map.get("imageCodeKey");
String imageCode = map.get("imageCode");
String mobile = map.get("mobile");
if(!StringUtils.hasLength(imageCodeKey) || !StringUtils.hasLength(imageCode) || !StringUtils.hasLength(mobile)){
throw new RuntimeException("参数不能为空");
}
//判断图片验证码是否正确
AjaxResult ajaxResult = redisFeign.get(imageCodeKey);
/*判断是否在同一个台电脑(浏览器)上操做
if(!ajaxResult.isSuccess() || ajaxResult.getResultObj()==null){
throw new RuntimeException("无效的验证码");
}*/
String redisImageCode = ajaxResult.getResultObj().toString();
if(!imageCode.equals(redisImageCode)){
throw new RuntimeException("验证码错误");
}
//--------------------------------------------------
String randomSmsCode = null;
//判断上一次的验证码是否还存在
AjaxResult lastResult = redisFeign.get("sms:" + mobile);
//判断上一次的请求和这次的请求是否间隔的有60秒
if(lastResult.isSuccess()&& lastResult.getResultObj()!=null) {
//将手机号,上一次操做的时间,手机号的随机数(验证码)封装成一个dto,方便存到redis
SMSSendDTO dto = JSON.parseObject(lastResult.getResultObj().toString(), SMSSendDTO.class);
//判断是否在频繁的操做(只要现在操做的时间和上一次操做的时间间隔没多久,那么就是在频繁的操做)
if(new Date().getTime()-dto.getCreateDate()<5000){
throw new RuntimeException("请勿频繁操做");
}else {
//如果大于60秒了,但是redis里面还没有过期,那么就用redis里面的验证码
randomSmsCode=dto.getRandomSmsCode();
return;
}
}
//------------这里表示是第一次操做--------------------
//生成手机验证码的随机数,并把这个数放到redis里面
randomSmsCode = StrUtils.getRandomString(4);
//将对象转成json格式的字符串(不能直接使用toString,不然取出来转换的时候会报格式异常)
String strJson = JSON.toJSONString(new SMSSendDTO(randomSmsCode, mobile, new Date().getTime()));
//保存到redis
redisFeign.setex("sms:" + mobile, 3000,strJson);
//------------发送验证码
System.out.println("验证码是:"+randomSmsCode);
}