代码示例
代码语言：javascript
复制import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
public class CaptchaUtil {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 40;
// 验证码字符个数
private int codeCount = 4;
// 验证码干扰线数
private int lineCount = 20;
// 验证码
private String code = null;
// 验证码图片Buffer
private BufferedImage buffImg = null;
private Random random = new Random();
public CaptchaUtil() {
creatImage();
}
public CaptchaUtil(int width, int height) {
this.width = width;
this.height = height;
creatImage();
}
public CaptchaUtil(int width, int height, int codeCount) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
creatImage();
}
public CaptchaUtil(int width, int height, int codeCount, int lineCount) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
this.lineCount = lineCount;
creatImage();
}
// 生成图片
private void creatImage() {
int fontWidth = width / codeCount;// 字体的宽度
int fontHeight = height - 5;// 字体的高度
int codeY = height - 8;
// 图像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = buffImg.getGraphics();
// 设置背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 设置字体
Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
g.setFont(font);
// 设置干扰线
for (int i = 0; i < lineCount; i ) {
int xs = random.nextInt(width);
int ys = random.nextInt(height);
int xe = xs random.nextInt(width);
int ye = ys random.nextInt(height);
g.setColor(getRandColor(1, 255));
g.drawLine(xs, ys, xe, ye);
}
// 添加噪点
float yawpRate = 0.01f;// 噪声率
int area = (int) (yawpRate * width * height);
for (int i = 0; i < area; i ) {
int x = random.nextInt(width);
int y = random.nextInt(height);
buffImg.setRGB(x, y, random.nextInt(255));
}
String str1 = randomStr(codeCount);// 得到随机字符
this.code = str1;
for (int i = 0; i < codeCount; i ) {
String strRand = str1.substring(i, i 1);
g.setColor(getRandColor(1, 100));
g.drawString(strRand, i * fontWidth 3, codeY);
}
}
// 得到随机字符
private String randomStr(int n) {
String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
String str2 = "";
int len = str1.length() - 1;
double r;
for (int i = 0; i < n; i ) {
r = (Math.random()) * len;
str2 = str2 str1.charAt((int) r);
}
return str2;
}
// 得到随机颜色
private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
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);
}
/**
* 产生随机字体
*/
private Font getFont(int size) {
Random ra = new Random();
Font font[] = new Font[5];
font[0] = new Font("Ravie", Font.PLAIN, size);
font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
font[2] = new Font("Fixedsys", Font.PLAIN, size);
font[3] = new Font("Wide Latin", Font.PLAIN, size);
font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
return font[ra.nextInt(5)];
}
// 扭曲方法
private void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private 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 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 void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code.toLowerCase();
}
// /**
// * 验证码
// * @param request
// * @param response
// * @param session
// * @throws IOException
// */
// @RequestMapping("/code.jpg")
// public void getCode3(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException {
// int width = NumberUtils.toInt(request.getParameter("width"), 100);
// int height = NumberUtils.toInt(request.getParameter("height"), 30);
// int codeCount = NumberUtils.toInt(request.getParameter("codeCount"), 4);
// int lineCount = NumberUtils.toInt(request.getParameter("lineCount"), 10);
// if (width > 1000) width = 100;
// if (height > 300) height = 30;
// if (codeCount > 10) codeCount = 4;
// if (lineCount > 100) lineCount = 10;
// // 设置响应的类型格式为图片格式
// response.setContentType("image/jpeg");
// // 禁止图像缓存。
// response.setHeader("Pragma", "no-cache");
// response.setHeader("Cache-Control", "no-cache");
// response.setDateHeader("Expires", 0);
// // 自定义参数
// CaptchaUtil code = new CaptchaUtil(width, height, codeCount, lineCount);
// String sessionId = session.getId();
// RedisUtil.set("captcha_" sessionId, code.getCode(), 60 * 30);
// code.write(response.getOutputStream());
// }
}
