java编写的验证码

package springbootdemo.demo.util;

import com.sun.deploy.net.HttpResponse;
import org.springframework.http.HttpRequest;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Random;

/**图形验证码工具类
 * @author 
 * @date 2019/8/20 17:54
 */
public class GraphicVerificationCodeUtil {

    /*生成的图片宽度*/
    private static final int WIDTH=150;
    /*图片高度*/
    private static final int HEIGTH=50;
    /*验证码字符个数*/
    private static final int codeCount=5;
   /* 干扰数*/
    private static final int radomLine=5;

    /*设置背景颜色*/
    public static void setBackgroundColor(Graphics2D g){
        //设置画笔颜色
        g.setColor(Color.WHITE);
        /*填充大小指定的矩形*/
        g.fillRect(0,0,WIDTH,HEIGTH);
    }

    public static void addRandomLine(Graphics2D g){
        Random random=new Random();
        /*设置干扰线*/
        for (int i = 0; i <radomLine ; i++) {
            int x1=random.nextInt(WIDTH);
            int y1=random.nextInt(HEIGTH);
            int x2=random.nextInt(WIDTH);
            int y2=random.nextInt(HEIGTH);
            //设置干扰线随机颜色
            g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));
            g.drawLine(x1,y1,x2,y2);
        }
    }

    public static void provideImg() throws IOException {
        /*生成一张图片*/
        BufferedImage bufferedImage=new BufferedImage(WIDTH,HEIGTH,BufferedImage.TYPE_INT_BGR);
        /*为图片构建一支画笔*/
        Graphics2D g=(Graphics2D)bufferedImage.getGraphics();
        //设置背景
        setBackgroundColor(g);
        //添加干扰线
        addRandomLine(g);
        //随机码
        String randomCode=setRandomCode(g);

        FileOutputStream fileOutputStream=new FileOutputStream("E:/hello.png");
        ImageIO.write(bufferedImage,"png",fileOutputStream);

    }
    /**
     * @description: 设置随机验证码
     * @author: 
     * @date: 2019/8/20
     * @param null:
     * @return:
     */
    public static String setRandomCode(Graphics2D g){
        String randomCode="";
        /*设置字体颜色*/
        g.setColor(new Color(20,20,20));
        /*设置字体*/
        g.setFont(new Font("宋体",Font.BOLD,HEIGTH-30));
        //随机字符
        String randomStr="ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789abcdefghijklmnopqrstuvwxyz";
        Random random=new Random();
        // 定义一个下标
        int index;
        // 定义X轴变量
        int x = WIDTH/10;
        for (int i = 0; i <codeCount ; i++) {
            index=random.nextInt(randomStr.length());
            // 获取index索引处的字符
            char c = randomStr.charAt(index);
            // 将每个字添加到sb中
            // String code =c+"";
            randomCode = randomCode + c;
            // 添加旋转角度 随机角度到-40 ---40度
            int angle = random.nextInt(80) - 40;
            // 转成弧度
            double theta = Math.PI * angle / 180;
            // 旋转
            //    g.rotate(theta,x,15);
            // 画上字符
            g.drawString(c + "",HEIGTH/2+10);
            // 转回来
            //    g.rotate(-theta,15);
            x += WIDTH/5;
        }
        return randomCode;
    }

    public static void main(String[] args) {
        try {
            provideImg();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}