Java实现动态获取图片验证码的示例代码

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);

drawRuezBUHiPlandomLine(g);

// randomCode记录随机产生的验证码

StringBuffer randomCode = new StringBuffehttp://r();

// 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.uezBUHiPlcode = 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 + "]");

}

}

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