springboot实现验证码功能本⽂实例为⼤家分享了spring boot实现验证码功能的具体代码，供⼤家参考，具体内容如下
流程是按照交互顺序。
1.1获取html
@RequestMapping(value="/authImage",method=RequestMethod.GET)
public String authImage(){
return "authImage";
}
1.2 html
<!DOCTYPE html>
<html>
<head>
<title>验证码</title>
</head>
<body>
<table>
<tr>
<td nowrap width="437"></td>
<td>
<img id="img" src="/image" />
<a href='#' οnclick="javascript:changeImg()" ><label >看不清？</label></a> </td>
</tr>
</table>
<!-- 触发JS刷新-->
<script type="text/javascript">
function changeImg(){
var img = ElementById("img");
img.src = "/image?date=" + new Date();
}
</script>
</body>
</html>
1.3.获取验证码图⽚
@RequestMapping(value="/getImage",method=RequestMethod.GET)
public void authImage(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");
// ⽣成随机字串
String verifyCode = ateVerifyCode(4);
// 存⼊会话session
HttpSession session = Session(true);
// 删除以前的
session.setAttribute("verCode", LowerCase());
session.setAttribute("codeTime", w());
// ⽣成图⽚
int w = 100, h = 30;
OutputStream out = OutputStream();
VerifyCodeUtils.outputImage(w, h, out, verifyCode);
}
1.4 核对验证码
@RequestMapping(value="validImage",method=RequestMethod.GET)
public String validImage(HttpServletRequest request,HttpSession session){
String code = Parameter("code");
Object verCode = Attribute("verCode");
return "验证码已失效，请重新输⼊";
}
String verCodeStr = String();
LocalDateTime localDateTime = (Attribute("codeTime");
long past = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
long now = w().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
if(verCodeStr == null || code == null || code.isEmpty() || !verCodeStr.equalsIgnoreCase(code)){
request.setAttribute("errmsg", "验证码错误");
return "验证码错误";
} else if((now-past)/1000/60>5){
request.setAttribute("errmsg", "验证码已过期，重新获取");
return "验证码已过期，重新获取";
} else {
//验证成功，删除存储的验证码
return "200";
}
}
2、VerifyCodeUtils的⼯具类
ample.springboot.demo.util.varcode;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
import javax.imageio.ImageIO;
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.Int(codesLen-1)));
}
String();
}
/
**
* @param h
* @param outputFile
* @param verifySize
* @return
* @throws IOException
*/
public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, outputFile, verifyCode);
return verifyCode;
}
/**
* 输出随机验证码图⽚流，并返回验证码值
* @param w
* @param h
* @param os
* @param verifySize
* @return
* @throws IOException
*/
public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, os, verifyCode);
return verifyCode;
}
/**
* ⽣成指定验证码图像⽂件
* @param w
* @param h
* @param outputFile
* @param code
* @throws IOException
*/
public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
if(outputFile == null){
return;
}
File dir = ParentFile();
if(!ists()){
dir.mkdirs();
}
try{
FileOutputStream fos = new FileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
} catch(IOException e){
throw e;
}
}
/**
* 输出指定验证码图⽚流
* @param w
* @param h
* @param os
* @param code
* @throws IOException
*/
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 = ateGraphics();
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] = Int(colorSpaces.length)];
fractions[i] = Float();
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 = Int(w - 1);
int y = Int(h - 1);
int xl = Int(6) + 1;
int yl = Int(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 = Int(w);
int y = Int(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 = CharArray();
for(int i = 0; i < verifySize; i++){
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * Double() * (Boolean() ? 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 + Int(bc - fc);
int g = fc + Int(bc - fc);
int b = fc + Int(bc - fc);
return new Color(r, g, b);
}
private static int getRandomIntColor() {
springcloud和springbootint[] 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] = Int(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 = Int(2);
boolean borderGap = true;
int frames = 1;
int phase = Int(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);
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 = Int(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);
if (borderGap) {
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
}
}
以上就是本⽂的全部内容，希望对⼤家的学习有所帮助，也希望⼤家多多⽀持。

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