java实现验证码功能ssm_SSM项目结合JSP页面做验证码
package com.blb.utils;
import javax.imageio.ImageIO;
import java.awt.*;
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;public classVerifyCodeUtils {public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVXYZ";private static Random random = newRandom();/**
* 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(intverifySize){returngenerateVerifyCode(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(intverifySize, String sources){if(sources == null || sources.length() == 0){
sources=VERIFY_CODES;
}int codesLen =sources.length();
Random rand= newRandom(System.currentTimeMillis());
StringBuilder verifyCode= newStringBuilder(verifySize);for(int i = 0; i < verifySize; i++){
verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
}returnverifyCode.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, intverifySize) throws IOException{
String verifyCode=generateVerifyCode(verifySize);
outputImage(w, h, outputFile, verifyCode);returnverifyCode;
}/**
* 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, intverifySize) throws IOException{
String verifyCode=generateVerifyCode(verifySize);
outputImage(w, h, os, verifyCode);returnverifyCode;
}/**
* 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, inth, File outputFile, String code) throws IOException {if(outputFile == null){return;
}
File dir=outputFile.getParentFile();if(!dir.exists()){
dir.mkdirs();
}try{
outputFile.createNewFile();
FileOutputStream fos= newFileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
}catch(IOException e){throwe;
}
}/**
* 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, inth, OutputStream os, String code) throws IOException{int verifySize =code.length();
BufferedImage image= newBufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand= newRandom();
Graphics2D g2=image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors= new Color[5];
Color[] colorSpaces= newColor[] { 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 = newRandom();
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.PLAIN, 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, intbc) {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 newColor(r, g, b);
}private static intgetRandomIntColor() {int[] rgb =getRandomRgb();int color = 0;for (intc : rgb) {
color= color << 8;
color= color |c;
}returncolor;
}private static int[] getRandomRgb() {int[] rgb = new int[3];for (int i = 0; i < 3; i++) {
rgb[i]= random.nextInt(255);
}returnrgb;
}private static void shear(Graphics g, int w1, inth1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}private static void shearX(Graphics g, int w1, inth1, 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, inth1, 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);
}
}
}
}