java 验证码插件_登录验证码插件

importjava.awt.Color;importjava.awt.Font;importjava.awt.Graphics;importjava.awt.Graphics2D;importjava.awt.image.BufferedImage;importjava.util.Random;public classCpachaUtil {/*** 验证码来源*/

final private char[] code = { '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i','j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F','G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};/*** 字体*/

final private String[] fontNames = new String[] { "黑体", "宋体", "Courier", "Arial", "Verdana", "Times", "Tahoma","Georgia"};/*** 字体样式*/

final private int[] fontStyles = new int[] { Font.BOLD, Font.ITALIC |Font.BOLD };/*** 验证码长度 默认4个字符*/

private int vcodeLen = 4;/*** 验证码图片字体大小 默认17*/

private int fontsize = 21;/*** 验证码图片宽度*/

private int width = (fontsize + 1) * vcodeLen + 10;/*** 验证码图片高度*/

private int height = fontsize + 12;/*** 干扰线条数 默认3条*/

private int disturbline = 3;publicCpachaUtil() {

}/*** 指定验证码长度

*

*@paramvcodeLen 验证码长度*/

public CpachaUtil(intvcodeLen) {this.vcodeLen =vcodeLen;this.width = (fontsize + 1) * vcodeLen + 10;

}/*** 指定验证码长度、图片宽度、高度

*

*@paramvcodeLen

*@paramwidth

*@paramheight*/

public CpachaUtil(int vcodeLen, int width, intheight) {this.vcodeLen =vcodeLen;this.width =width;this.height =height;

}/*** 生成验证码图片

*

*@paramvcode 要画的验证码

*@paramdrawline 是否画干扰线

*@return

*/

public BufferedImage generatorVCodeImage(String vcode, booleandrawline) {//创建验证码图片

BufferedImage vcodeImage = newBufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g=vcodeImage.getGraphics();//填充背景色

g.setColor(new Color(246, 240, 250));

g.fillRect(0, 0, width, height);if(drawline) {

drawDisturbLine(g);

}//用于生成伪随机数

Random ran = newRandom();//在图片上画验证码

for (int i = 0; i < vcode.length(); i++) {//设置字体

g.setFont(newFont(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)],

fontsize));//随机生成颜色

g.setColor(getRandomColor());//画验证码

g.drawString(vcode.charAt(i) + "", i * fontsize + 10, fontsize + 5);

}//释放此图形的上下文以及它使用的所有系统资源

g.dispose();returnvcodeImage;

}/*** 获得旋转字体的验证码图片

*

*@paramvcode

*@paramdrawline 是否画干扰线

*@return

*/

public BufferedImage generatorRotateVCodeImage(String vcode, booleandrawline) {//创建验证码图片

BufferedImage rotateVcodeImage = newBufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g2d=rotateVcodeImage.createGraphics();//填充背景色

g2d.setColor(new Color(246, 240, 250));

g2d.fillRect(0, 0, width, height);if(drawline) {

drawDisturbLine(g2d);

}//在图片上画验证码

for (int i = 0; i < vcode.length(); i++) {

BufferedImage rotateImage=getRotateImage(vcode.charAt(i));

g2d.drawImage(rotateImage,null, (int) (this.height * 0.7) * i, 0);

}

g2d.dispose();returnrotateVcodeImage;

}/*** 生成验证码

*

*@return验证码*/

publicString generatorVCode() {int len =code.length;

Random ran= newRandom();

StringBuffer sb= newStringBuffer();for (int i = 0; i < vcodeLen; i++) {int index =ran.nextInt(len);

sb.append(code[index]);

}returnsb.toString();

}/*** 为验证码图片画一些干扰线

*

*@paramg*/

private voiddrawDisturbLine(Graphics g) {

Random ran= newRandom();for (int i = 0; i < disturbline; i++) {int x1 =ran.nextInt(width);int y1 =ran.nextInt(height);int x2 =ran.nextInt(width);int y2 =ran.nextInt(height);

g.setColor(getRandomColor());//画干扰线

g.drawLine(x1, y1, x2, y2);

}

}/*** 获取一张旋转的图片

*

*@paramc 要画的字符

*@return

*/

private BufferedImage getRotateImage(charc) {

BufferedImage rotateImage= newBufferedImage(height, height, BufferedImage.TYPE_INT_ARGB);

Graphics2D g2d=rotateImage.createGraphics();//设置透明度为0

g2d.setColor(new Color(255, 255, 255, 0));

g2d.fillRect(0, 0, height, height);

Random ran= newRandom();

g2d.setFont(newFont(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)],

fontsize));

g2d.setColor(getRandomColor());double theta =getTheta();//旋转图片

g2d.rotate(theta, height / 2, height / 2);

g2d.drawString(Character.toString(c), (height- fontsize) / 2, fontsize + 5);

g2d.dispose();returnrotateImage;

}/***@return返回一个随机颜色*/

privateColor getRandomColor() {

Random ran= newRandom();return new Color(ran.nextInt(220), ran.nextInt(220), ran.nextInt(220));

}/***@return角度*/

private doublegetTheta() {return ((int) (Math.random() * 1000) % 2 == 0 ? -1 : 1) *Math.random();

}/***@return验证码字符个数*/

public intgetVcodeLen() {returnvcodeLen;

}/*** 设置验证码字符个数

*

*@paramvcodeLen*/

public void setVcodeLen(intvcodeLen) {this.width = (fontsize + 3) * vcodeLen + 10;this.vcodeLen =vcodeLen;

}/***@return字体大小*/

public intgetFontsize() {returnfontsize;

}/*** 设置字体大小

*

*@paramfontsize*/

public void setFontsize(intfontsize) {this.width = (fontsize + 3) * vcodeLen + 10;this.height = fontsize + 15;this.fontsize =fontsize;

}/***@return图片宽度*/

public intgetWidth() {returnwidth;

}/*** 设置图片宽度

*

*@paramwidth*/

public void setWidth(intwidth) {this.width =width;

}/***@return图片高度*/

public intgetHeight() {returnheight;

}/*** 设置图片高度

*

*@paramheight*/

public void setHeight(intheight) {this.height =height;

}/***@return干扰线条数*/

public intgetDisturbline() {returndisturbline;

}/*** 设置干扰线条数

*

*@paramdisturbline*/

public void setDisturbline(intdisturbline) {this.disturbline =disturbline;

}

}