本文实例为大家分享了java生成字母验证码的具体代码，供大家参考，具体内容如下
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import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
public class VerifyCode {
//图片宽高
private int w=70;
private int h=35;
private Random r=new Random();
private String[] fontNames={"宋体","华文楷体","黑体","微软雅黑","楷体_GB2312"};
private String codes="234567890qwertyuipasdfghjkzxcvbnmQWERTYUIPASDFGHJKZXCVBNM";
private Color bgColor=new Color(255,255,255);
private String text;
//生成随机颜色
private Color randomColor(){
int red=r.nextInt(150);
int green=r.nextInt(150);
int blue=r.nextInt(150);
return new Color(red, green, blue);
}
//生成随机字体
private Font randomFont(){
int index=r.nextInt(fontNames.length);
String fontName=fontNames[index];
int style=r.nextInt(4);//0 无 1 粗体 2 斜体 3 粗+斜
int size=r.nextInt(5)+24; //生成随机字号 24~28
return new Font(fontName, style, size);
}
//干扰线
private void drowLine(BufferedImage image){
//生成4条干扰线
int num=4;
Graphics2D bi=(Graphics2D) image.getGraphics();
for (int i = 0; i < num; i++) {
int x1=r.nextInt(w);
int x2=r.nextInt(w);
int y1=r.nextInt(h);
int y2=r.nextInt(h);
bi.setStroke(new BasicStroke(1.5F));
bi.setColor(Color.BLUE);//干扰线色
bi.drawLine(x1,y1,x2,y2);
}
}
//随机生成一个字符
private char randomChar(){
int index=r.nextInt(codes.length());
return codes.charAt(index);
}
//图片缓冲区
private BufferedImage createImage(){
BufferedImage image=new BufferedImage(w, h, BufferedImage.TYPE_INT_BGR);
Graphics2D bi=(Graphics2D) image.getGraphics();
bi.setColor(this.bgColor);
bi.fillRect(0, 0, w, h);
return image;
}
//生成图片
public BufferedImage getImage(){
BufferedImage image=createImage();
Graphics2D bi=(Graphics2D) image.getGraphics();
StringBuilder sb=new StringBuilder();
for (int i = 0; i <4; i++) {
String string=randomChar()+"";
sb.append(string);
//每个字符占图片1/4宽
float x=i*1.0F*w/4;
//随机字体格式
bi.setFont(randomFont());
bi.setColor(randomColor());
//把字写在图片适当处（h-6指图片距底部6个高度）
bi.drawString(string, x, h-6);
}
this.text=sb.toString();
drowLine(image);
return image;
}
//返回得到的字体
public String getText(){
return text;
}
//把图片写入指定位置
public static void output(BufferedImage image,OutputStream out){
try {
ImageIO.write(image, "JPG", out);
} catch (IOException e) {
e.printStackTrace();
}
}
}
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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服务器之家。