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

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();

}

}

}

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聚米学院。