短视频商城系统，通过Java实现图片验证码，点击刷新图片验证码
创建生成图片验证码的工具类：
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
/**
* 验证码生成器
*
*/
public class SCaptcha {
// 图片的宽度。
private int width = 120;
// 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 = 50;
// 验证码
private String code = null;
// 验证码图片Buffer
private BufferedImage buffImg = null;
// 随即的字符数组
private char[] codeSequence = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'M', 'N', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
// 生成随机数
private Random random = new Random();
public SCaptcha() {
this.createCode();
}
/**
*
* @param width 图片宽
* @param height 图片高
*/
public SCaptcha(int width, int height) {
this.width = width;
this.height = height;
this.createCode();
}
/**
*
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param lineCount 干扰线条数
*/
public SCaptcha(int width, int height, int codeCount, int lineCount) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
this.lineCount = lineCount;
this.createCode();
}
public void createCode() {
int codeX = 0;
int fontHeight = 0;
fontHeight = height - 5;// 字体的高度
codeX = width / (codeCount + 3);// 每个字符的宽度
// 图像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
// 将图像填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 创建字体
ImgFontByte imgFont = new ImgFontByte();
Font font = imgFont.getFont(fontHeight);
g.setFont(font);
StringBuffer randomCode = new StringBuffer();
// 随机产生验证码字符
for (int i = 0; i < codeCount; i++) {
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
// 设置字体颜色
g.setColor(getRandomColor());
// 设置字体位置
g.drawString(strRand, (i + 1) * codeX, getRandomNumber(height / 2) + 25);
randomCode.append(strRand);
}
code = randomCode.toString();
}
/** 获取随机颜色 */
private Color getRandomColor() {
int r = getRandomNumber(255);
int g = getRandomNumber(255);
int b = getRandomNumber(255);
return new Color(r, g, b);
}
/** 获取随机数 */
private int getRandomNumber(int number) {
return random.nextInt(number);
}
public void write(String path) throws IOException {
OutputStream sos = new FileOutputStream(path);
this.write(sos);
}
public void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code;
}
/** 字体样式类 */
class ImgFontByte {
public Font getFont(int fontHeight) {
try {
Font baseFont = Font.createFont(Font.HANGING_BASELINE, new ByteArrayInputStream(
hex2byte(getFontByteStr())));
return baseFont.deriveFont(Font.PLAIN, fontHeight);
} catch (Exception e) {
return new Font("Arial", Font.PLAIN, fontHeight);
}
}
private byte[] hex2byte(String str) {
if (str == null)
return null;
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1)
return null;
byte[] b = new byte[len / 2];
try {
for (int i = 0; i < str.length(); i += 2) {
b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
}
return b;
} catch (Exception e) {
return null;
}
}
// 字体文件的十六进制字符串
private String getFontByteStr() {
//防止报字符串长度过长错误，改为从配置文件读取
return ReadFontByteProperties.getFontByteStr();
}
}
}
controller层代码：
// 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);
//实例生成验证码对象
SCaptcha instance = new SCaptcha();
//将验证码存入session
request.getSession().setAttribute("verification", instance.getCode());
//向页面输出验证码图片
instance.write(response.getOutputStream());
页面代码：
<img id="vimg" src="${path }/login/verification"/>
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