验证码生成及验证-优快云博客

本文链接：https://blog.youkuaiyun.com/gghhz/article/details/77966536

---controller

/**

* 生成验证码

@RequestMapping (value = "showVerifyCode" , produces = "image/jpeg" )

public void showVerifyCode(HttpServletRequest request, HttpServletResponse response) {

// 生成随机字串

String verifyCode = VerifyCodeUtils. generateVerifyCode (4);

// 存入会话session

HttpSession session = request.getSession( true );

// 删除以前的

session.removeAttribute( "verifyCode" );

session.setAttribute( "verifyCode" , verifyCode.toLowerCase());

// 生成图片

int w = 100, h = 34;

try {

VerifyCodeUtils. outputImage (w, h, response.getOutputStream(), verifyCode);

} catch (IOException e) {

e.printStackTrace();

}

---Bean

package com.kanq.platform.ocean.common;

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;

/**

* 验证码生成

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();

}

/**

* 生成随机验证码文件,并返回验证码值

* @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;

}

/**

* 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 = 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;

}

/**

* 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 = 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);

}

public static void main(String[] args) throws IOException{

File dir = new File( "d:/testverifies" );

int w = 200, h = 80;

for ( int i = 0; i < 50; i++){

String verifyCode = generateVerifyCode (4);

File file = new File(dir, verifyCode + ".jpg" );

outputImage (w, h, file, verifyCode);

}

---JSP

< div class = "yzm col-xs-5" >

< img id = "imgId" style =" width : 80px ; height : 26px ;" src = " <%= path %> /web/user/showVerifyCode.do" />

< a class = "kbq" href = "javascript:;" id = "refreshId" > 看不清 </ a >

</ div >

--JS

// 刷新验证码

$( "#imgId, #refreshId" ).click(

function () {

$( "#imgId" ).attr(

"src" ,

_path + "/web/user/showVerifyCode.do?date="

+ new Date());

});

---判断验证码是否正确

--JS

var initBootstrapValidator = function () {
$("#defaultForm").bootstrapValidator({
message: 'This value is not valid',
feedbackIcons: {/*输入框不同状态，显示图片的样式 icon-mini-edit*/
/*valid: 'glyphicon glyphicon-ok',*/
valid: 'icon-mini-edit',
invalid: 'glyphicon glyphicon-remove',
validating: 'icon-loading'
},
fields: {

verifyCode: {
validators: {
notEmpty: {
message: '验证码不能为空'
},
stringLength: {
min: 4,
max: 4,
message: '验证码长度为4位',
},
remote: {
url: _path + "/web/user/checkVerifyCode.do",
message:"验证码不正确",
type: "post",
dataType: 'json',
data: { //不填写会自动将对应的id和value发给后台

},
delay: 200
}
}
}
}
});
}

----后台代码

/**
* 判断验证码是否正确
*
* @throws IOException
*/
@RequestMapping(value = "checkVerifyCode", produces = "text/plain;charset=UTF-8")
public String checkVerifyCode(String verifyCode, HttpServletRequest request) throws IOException {
HashMap<String, Object> resultMap = new HashMap<String, Object>();
HttpSession session = request.getSession(true);
String verifyCodeSession = (String) session.getAttribute("verifyCode");
if (verifyCode != null && verifyCode.toLowerCase().equals(verifyCodeSession)) {//toLowerCase()：把字符串变成小写
resultMap.put("message", "验证码正确");
resultMap.put("valid", true);
resultMap.put("success", true);
} else {
resultMap.put("message", "验证码错误");
resultMap.put("valid", false);
resultMap.put("success", false);
}
return JsonMapper.toJson(resultMap);
}

验证码生成与验证