java验证码图片工具类_工具类：VerifyCode.java：图片验证码

工具类：VerifyCode.java：图片验证码

工具类：VerifyCode.java：图片验证码

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源码：

“`

package com.zhenzhigu.commons.util;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import javax.imageio.ImageIO;

/**

* 验证码生成

* @author Master.Xia

* @version 1.0 Create:2017年2月8日15:29:32

*/

public class VerifyCode {

// 图片的宽度。

private int width = 160;

// 图片的高度。

private int height = 40;

// 验证码字符个数

private int codeCount = 4;

// 验证码干扰线数

private int lineCount = 20;

// 验证码

private String code = null;

// 验证码图片Buffer

private BufferedImage buffImg = null;

Random random = new Random();

public VerifyCode() {

creatImage();

}

public VerifyCode(int width, int height) {

this.width = width;

this.height = height;

creatImage();

}

public VerifyCode(int width, int height, int codeCount) {

this.width = width;

this.height = height;

this.codeCount = codeCount;

creatImage();

}

public VerifyCode(int width, int height, int codeCount, int lineCount) {

this.width = width;

this.height = height;

this.codeCount = codeCount;

this.lineCount = lineCount;

creatImage();

}

// 生成图片

private void creatImage() {

int fontWidth = width / codeCount;// 字体的宽度

int fontHeight = height – 5;// 字体的高度

int codeY = height – 8;

// 图像buffer

buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = buffImg.getGraphics();

// 设置背景色

g.setColor(getRandColor(200, 250));

g.fillRect(0, 0, width, height);

// 设置字体

g.setFont(getFont(fontHeight));

// 设置干扰线

for (int i = 0; i < lineCount; i++) {

int xs = random.nextInt(width);

int ys = random.nextInt(height);

int xe = xs + random.nextInt(width);

int ye = ys + random.nextInt(height);

g.setColor(getRandColor(1, 255));

g.drawLine(xs, ys, xe, ye);

}

// 添加噪点

float yawpRate = 0.01f;// 噪声率

int area = (int) (yawpRate * width * height);

for (int i = 0; i < area; i++) {

int x = random.nextInt(width);

int y = random.nextInt(height);

buffImg.setRGB(x, y, random.nextInt(255));

}

String str1 = randomStr(codeCount);// 得到随机字符

this.code = str1;

for (int i = 0; i < codeCount; i++) {

String strRand = str1.substring(i, i + 1);

g.setColor(getRandColor(1, 255));

g.drawString(strRand, i * fontWidth + 3, codeY);

}

}

// 得到随机字符

private String randomStr(int n) {

String str1 = “ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz123456789”;

StringBuilder sb = new StringBuilder();

int len = str1.length() – 1;

double r;

for (int i = 0; i < n; i++) {

r = (Math.random()) * len;

sb.append(str1.charAt((int) r));

}

return sb.toString();

}

// 得到随机颜色

private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色

if (fc > 255)

fc = 255;

if (bc > 255)

bc = 255;

int r = fc + random.nextInt(bc – fc);

int g = fc + random.nextInt(bc – fc);

int b = fc + random.nextInt(bc – fc);

return new Color(r, g, b);

}

/**

* 产生随机字体

*/

private Font getFont(int size) {

Random random = new Random();

Font font[] = new Font[5];

font[0] = new Font(“Ravie”, Font.PLAIN, size);

font[1] = new Font(“Antique Olive Compact”, Font.PLAIN, size);

font[2] = new Font(“Fixedsys”, Font.PLAIN, size);

font[3] = new Font(“Wide Latin”, Font.PLAIN, size);

font[4] = new Font(“Gill Sans Ultra Bold”, Font.PLAIN, size);

return font[random.nextInt(5)];

}

// 扭曲方法

private void shear(Graphics g, int w1, int h1, Color color) {

shearX(g, w1, h1, color);

shearY(g, w1, h1, color);

}

private void shearX(Graphics g, int w1, int h1, Color color) {

int period = random.nextInt(2);

boolean borderGap = true;

int frames = 1;

int phase = random.nextInt(2);

for (int i = 0; i < h1; i++) {

double d = (double) (period >> 1)

* Math.sin((double) i / (double) period

+ (6.2831853071795862D * (double) phase) / (double) frames);

g.copyArea(0, i, w1, 1, (int) d, 0);

if (borderGap) {

g.setColor(color);

g.drawLine((int) d, i, 0, i);

g.drawLine((int) d + w1, i, w1, i);

}

}

}

private void shearY(Graphics g, int w1, int h1, Color color) {

int period = random.nextInt(40) + 10; // 50;

boolean borderGap = true;

int frames = 20;

int phase = 7;

for (int i = 0; i < w1; i++) {

double d = (double) (period >> 1)

* Math.sin((double) i / (double) period

+ (6.2831853071795862D * (double) phase) / (double) frames);

g.copyArea(i, 0, 1, h1, 0, (int) d);

if (borderGap) {

g.setColor(color);

g.drawLine(i, (int) d, i, 0);

g.drawLine(i, (int) d + h1, i, h1);

}

}

}

public void write(OutputStream sos) throws IOException {

ImageIO.write(buffImg, “jpeg”, sos);

sos.close();

}

public BufferedImage getBuffImg() {

return buffImg;

}

public String getCode() {

return code.toLowerCase();

}

// 使用方法

public void demo(

javax.servlet.http.HttpServletRequest req,

javax.servlet.http.HttpServletResponse response,

javax.servlet.http.HttpSession session

) throws IOException {

// 设置响应的类型格式为图片格式

response.setContentType(“image/jpeg”);

// 禁止图像缓存。

response.setHeader(“Pragma”, “no-cache”);

response.setHeader(“Cache-Control”, “no-cache”);

response.setDateHeader(“Expires”, 0);

VerifyCode vCode = new VerifyCode(100, 30, 5, 10);

session.setAttribute(“code”, vCode.getCode());

vCode.write(response.getOutputStream());

}

}

“`