這篇文章主要爲大家詳細介紹了spring boot實現驗證碼功能，具有一定的參考價值，感興趣的小夥伴們可以參考一下
本文實例爲大家分享了spring boot實現驗證碼功能的具體代碼，供大家參考，具體內容如下
流程是按照交互順序。
1.controller層代碼，獲取驗證碼，以及生成驗證碼圖片。
1.1獲取html
@RequestMapping(value="/authImage",method=RequestMethod.GET)
public String authImage(){
return "authImage";
}
1.2 html
<!DOCTYPE html>
<html>
<head>
<title>驗證碼</title>
</head>
<body>
<table>
<tr>
<td nowrap width="437"></td>
<td>
<img id="img" src="/image" />
<a href='#' οnclick="javascript:changeImg()" style="color:white;"><label style="color:black;">看不清？</label></a>
</td>
</tr>
</table>
<!-- 觸發JS刷新-->
<script type="text/javascript">
function changeImg(){
var img = document.getElementById("img");
img.src = "/image?date=" + new Date();
}
</script>
</body>
</html>
1.3.獲取驗證碼圖片
@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");
// 生成隨機字串
String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
// 存入會話session
HttpSession session = request.getSession(true);
// 刪除以前的
session.removeAttribute("verCode");
session.removeAttribute("codeTime");
session.setAttribute("verCode", verifyCode.toLowerCase());
session.setAttribute("codeTime", LocalDateTime.now());
// 生成圖片
int w = 100, h = 30;
OutputStream out = response.getOutputStream();
VerifyCodeUtils.outputImage(w, h, out, verifyCode);
}
1.4 覈對驗證碼
@RequestMapping(value="validImage",method=RequestMethod.GET)
public String validImage(HttpServletRequest request,HttpSession session){
String code = request.getParameter("code");
Object verCode = session.getAttribute("verCode");
if (null == verCode) {
request.setAttribute("errmsg", "驗證碼已失效，請重新輸入");
return "驗證碼已失效，請重新輸入";
}
String verCodeStr = verCode.toString();
LocalDateTime localDateTime = (LocalDateTime)session.getAttribute("codeTime");
long past = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
long now = LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
if(verCodeStr == null || code == null || code.isEmpty() || !verCodeStr.equalsIgnoreCase(code)){
request.setAttribute("errmsg", "驗證碼錯誤");
return "驗證碼錯誤";
} else if((now-past)/1000/60>5){
request.setAttribute("errmsg", "驗證碼已過期，重新獲取");
return "驗證碼已過期，重新獲取";
} else {
//驗證成功，刪除存儲的驗證碼
session.removeAttribute("verCode");
return "200";
}
}
2、VerifyCodeUtils的工具類
package com.example.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 java.awt.geom.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字體，系統裏沒有的話需要安裝字體，字體只顯示大寫，去掉了1,0,i,o幾個容易混淆的字符
public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
private static Random random = new Random();
/**
* 使用系統默認字符源生成驗證碼
* @param verifySize 驗證碼長度
* @return
*/
public static String generateVerifyCode(int verifySize){
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成驗證碼
* @param verifySize 驗證碼長度
* @param sources 驗證碼字符源
* @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();
}
/**
* 生成隨機驗證碼文件,並返回驗證碼值
* @param w
* @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;
}
/**
* 輸出隨機驗證碼圖片流,並返回驗證碼值
* @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;
}
/**
* 生成指定驗證碼圖像文件
* @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 = outputFile.getParentFile();
if(!dir.exists()){
dir.mkdirs();
}
try{
outputFile.createNewFile();
FileOutputStream fos = new FileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
} catch(IOException e){
throw e;
}
}
/**
* 輸出指定驗證碼圖片流
* @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 = 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);// 設置邊框色
g2.fillRect(0, 0, w, h);
Color c = getRandColor(200, 250);
g2.setColor(c);// 設置背景色
g2.fillRect(0, 2, w, h-4);
//繪製干擾線
Random random = new Random();
g2.setColor(getRandColor(160, 200));// 設置線條的顏色
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);
}
// 添加噪點
float yawpRate = 0.05f;// 噪聲率
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);// 使圖片扭曲
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);
}
}
}
}
}
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持神馬文庫。