1.生成图型验证码
package com.beauty.common.util.schema;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
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.io.OutputStream;
import java.util.Random;
/**
* 生成随机验证码
* @author raoBo
* @version 2021-04-19
*/
@SuppressWarnings("serial")
public class ValidateCodeServlet extends HttpServlet {
public static final String VALIDATE_CODE = "validateCode";
private int w = 70;
private int h = 26;
public ValidateCodeServlet() {
super();
}
public void destroy() {
super.destroy();
}
public static boolean validate(HttpServletRequest request, String validateCode){
String code = (String)request.getSession().getAttribute(VALIDATE_CODE);
return validateCode.toUpperCase().equals(code);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String validateCode = request.getParameter(VALIDATE_CODE); // AJAX验证，成功返回true
if (StringUtils.isNotBlank(validateCode)){
response.getOutputStream().print(validate(request, validateCode)?"true":"false");
}else{
this.doPost(request, response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
createImage(request,response);
}
private void createImage(HttpServletRequest request,
HttpServletResponse response) throws IOException {
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
/*
* 得到参数高，宽，都为数字时，则使用设置高宽，否则使用默认值
*/
String width = request.getParameter("width");
String height = request.getParameter("height");
if (StringUtils.isNumeric(width) && StringUtils.isNumeric(height)) {
w = NumberUtils.toInt(width);
h = NumberUtils.toInt(height);
}
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
/*
* 生成背景
*/
createBackground(g);
/*
* 生成字符
*/
String s = createCharacter(g);
request.getSession().setAttribute(VALIDATE_CODE, s);
g.dispose();
OutputStream out = response.getOutputStream();
ImageIO.write(image, "JPEG", out);
out.close();
}
private Color getRandColor(int fc,int bc) {
int f = fc;
int b = bc;
Random random=new Random();
if(f>255) {
f=255;
}
if(b>255) {
b=255;
}
return new Color(f+random.nextInt(b-f),f+random.nextInt(b-f),f+random.nextInt(b-f));
}
public void createBackground(Graphics g) {
// 填充背景
g.setColor(getRandColor(220,250));
g.fillRect(0, 0, w, h);
// // 加入干扰线条
// for (int i = 0; i < 8; i++) {
// g.setColor(getRandColor(40,150));
// Random random = new Random();
// int x = random.nextInt(w);
// int y = random.nextInt(h);
// int x1 = random.nextInt(w);
// int y1 = random.nextInt(h);
// g.drawLine(x, y, x1, y1);
// }
}
private String createCharacter(Graphics g) {
char[] codeSeq = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
String[] fontTypes = {"Arial","Arial Black","AvantGarde Bk BT","Calibri"};
Random random = new Random();
StringBuilder s = new StringBuilder();
for (int i = 0; i < 4; i++) {
String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);//random.nextInt(10));
g.setColor(new Color(50 + random.nextInt(100), 50 + random.nextInt(100), 50 + random.nextInt(100)));
g.setFont(new Font(fontTypes[random.nextInt(fontTypes.length)],Font.BOLD,26));
g.drawString(r, 15 * i + 5, 19 + random.nextInt(8));
// g.drawString(r, i*w/4, h-5);
s.append(r);
}
return s.toString();
}
public static String createCharacterText(){
char[] codeSeq = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
Random random = new Random();
StringBuilder s = new StringBuilder();
for (int i = 0; i < 4; i++) {
String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);//random.nextInt(10));
s.append(r);
}
return s.toString();
}
public BufferedImage createImage(String text)
{
/*
* 得到参数高，宽，都为数字时，则使用设置高宽，否则使用默认值
*/
BufferedImage image = new BufferedImage(70, 26, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
/*
* 生成背景
*/
createBackground(g);
/*
*字符串加入
*/
String[] fontTypes = {"Arial","Arial Black","AvantGarde Bk BT","Calibri"};
Random random = new Random();
StringBuilder s = new StringBuilder();
int length = text.length();
for (int i = 0; i < length; i++) {
String r = text.substring(i,i+1);
g.setColor(new Color(50 + random.nextInt(100), 50 + random.nextInt(100), 50 + random.nextInt(100)));
g.setFont(new Font(fontTypes[random.nextInt(fontTypes.length)],Font.BOLD,26));
g.drawString(r, 15 * i + 5, 19 + random.nextInt(8));
}
g.dispose();
return image;
}
}
2.Base64Util 工具类
package com.beauty.common.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Base64编码工具类
*
* @author raoBo
* @date 2021/4/19
*/
public class Base64Util {
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
public static String encode(byte[] data) {
int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);
int end = len - 3;
int i = start;
int n = 0;
while (i <= end) {
int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);
i += 3;
if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}
if (i == start + len - 2) {
int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = (((int) data[i]) & 0x0ff) << 16;
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}
return buf.toString();
}
private static int decode(char c) {
if (c >= 'A' && c <= 'Z')
return ((int) c) - 65;
else if (c >= 'a' && c <= 'z')
return ((int) c) - 97 + 26;
else if (c >= '0' && c <= '9')
return ((int) c) - 48 + 26 + 26;
else
switch (c) {
case '+':
return 62;
case '/':
return 63;
case '=':
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}
/**
* Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned.
*/
public static byte[] decode(String s) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}
private static void decode(String s, OutputStream os) throws IOException {
int i = 0;
int len = s.length();
while (true) {
while (i < len && s.charAt(i) <= ' ')
i++;
if (i == len)
break;
int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3)));
os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == '=')
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == '=')
break;
os.write(tri & 255);
i += 4;
}
}
}
3.生成和验证
public class SchemaUtil {
@Autowired
private RedisUtil redisUtil;
/**
* 生成图形验证码
* @param deviceId 前端唯一标识
* @param scene 场景：注册 登录 修改手机号 验证邮箱
* @return
*/
public String imgCaptcha(String deviceId,String scene){
String captcha = ValidateCodeServlet.createCharacterText();
log.info("--imgCaptcha--生成验证码：{}",captcha);
ValidateCodeServlet codeServlet = new ValidateCodeServlet();
BufferedImage bufferedImage = codeServlet.createImage(captcha);
try{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "jpg", out);
String key = deviceId + "_" + scene;
redisUtil.set(key,captcha,60*5);
log.info("--imgCaptcha--生成图型成功：{}",captcha);
return Base64Util.encode(out.toByteArray());
}catch (Exception e){
log.error("--imgCaptcha--生成图型验证码失败",e);
e.printStackTrace();
}
throw new BizException("生成图型验证码失败", ResultCodeConstant.GENERATING_GRAPH_ERROR);
}
/**
* 图型验证码code
* @param deviceId 前端唯一标识
* @param scene 场景：注册 登录 修改手机号 验证邮箱
* @param code 用户输入验证码
* @return
*/
public boolean verificationCode(String deviceId,String scene,String code){
String key = deviceId + "_" + scene;
if (!redisUtil.hasKey(key)){
return false;
}
String captcha = (String) redisUtil.get(key);
if (StringUtils.equalsIgnoreCase(captcha,code)){
return true;
}
return false;
}
这里场景可以有很多种，自己定义。唯一标识码可以后端生成，返回给前端进行使用。