本文介绍了Java实现动态获取图片验证码的示例代码，分享给大家，具体如下：
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Random;
public class ImgAuthCode {
/**
* 图片的宽度
*/
private int width = 330;
/**
* 图片的高度
*/
private int height = 40;
/**
* 验证码字符个数
*/
private int codeCount = 5;
/**
* 验证码干扰线数
*/
private int lineCount = 150;
/**
* 图片验证码类型
*/
private ImgCodeType imgCodeType = DEFAULT_TYPE;
/**
* 验证码
*/
private String code = null;
/**
* 验证码图片Buffer
*/
private BufferedImage buffImg = null;
private static final ImgCodeType DEFAULT_TYPE = ImgCodeType.ENANDNUMBER;
private static char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
public ImgAuthCode() {
this.createCode();
}
/**
* @param width 图片宽
* @param height 图片高
*/
public ImgAuthCode(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 ImgAuthCode(int width, int height, int codeCount, int lineCount,ImgCodeType imgCodeType) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
this.lineCount = lineCount;
this.imgCodeType = imgCodeType;
this.createCode();
}
public void createCode() {
int x = 0, fontHeight = 0, codeY = 0;
x = width / (codeCount + 2);// 每个字符的宽度
fontHeight = height - 2;// 字体的高度
codeY = height - 4;
// 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);
Font font=new Font("微软雅黑",Font.PLAIN, fontHeight);
g.setFont(font);
drawRandomLine(g);
// randomCode记录随机产生的验证码
StringBuffer randomCode = new StringBuffer();
// 随机产生codeCount个字符的验证码。
for (int i = 0; i < codeCount; i++) {
String strRand = getRandomStr(imgCodeType);
// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
g.setColor(getRandomColor());
g.drawString(strRand, (i + 1) * x, codeY);
// 将产生的四个随机数组合在一起。
randomCode.append(strRand);
}
this.code = randomCode.toString();
}
private void drawRandomLine(Graphics g){
//干扰线
for (int i = 0; i < lineCount; i++) {
int xs = new Random().nextInt(width);
int ys = new Random().nextInt(height);
int xe = xs + new Random().nextInt(width / 8);
int ye = ys + new Random().nextInt(height / 8);
g.setColor(getRandomColor());
g.drawLine(xs, ys, xe, ye);
}
}
public Color getRandomColor(){
int red = 0, green = 0, blue = 0;
Random random = new Random();
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
return new Color(red,green,blue);
}
public String getRandomStr(ImgCodeType type) {
switch (type) {
case ENANDNUMBER:
return creatENAndNumberCode();
case HAN:
return creatHan();
case EN:
return creatENCode();
case NUMBER:
return creatNumberCode();
default:
return creatENAndNumberCode();
}
}
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();
}
/**
* 单个汉字
*
* @return
*/
public static String creatHan() {
String code = "";
Random random = new Random();
//一个汉字两个字节
byte[] bytes = new byte[2];
bytes[0] = Integer.valueOf(176 + Math.abs(random.nextInt(39))).byteValue();
bytes[1] = Integer.valueOf(161 + Math.abs(random.nextInt(93))).byteValue();
try {
code = new String(bytes, "GBK");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return code;
}
/**
* 英文字母加数字
*
* @return
*/
public static String creatENAndNumberCode() {
Random random = new Random();
return String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
}
/**
* 英文字母
*
*
* @return
*/
public static String creatENCode() {
StringBuffer code = new StringBuffer();
Random random = new Random();
int s = random.nextInt(25) + 65;
code.append((char) s);
return code.toString();
}
/**
* 纯数字验证码
*
*
* @return
*/
public static String creatNumberCode() {
StringBuffer code = new StringBuffer();
Random random = new Random();
return code.append(random.nextInt(9) + "").toString();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public static void main(String[] args) {
String randomChineseChar = creatHan();
String randomEnChar = creatENCode();
System.out.println("args = [" + randomChineseChar + "]");
System.out.println("args = [" + randomEnChar + "]");
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。
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