Java实现动态获取图片验证码的示例代码

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 + "]");
 }
}

来源：https://blog.csdn.net/qq_29653517/article/details/91870964