package com.yami.trading.common.util;
|
|
|
import java.awt.Color;
|
import java.awt.Font;
|
import java.awt.Graphics2D;
|
import java.awt.image.BufferedImage;
|
import java.io.ByteArrayOutputStream;
|
import java.io.IOException;
|
import java.io.OutputStream;
|
import java.util.Random;
|
|
import javax.imageio.ImageIO;
|
import javax.xml.bind.DatatypeConverter;
|
|
public class ImageVerificationCodeUtil {
|
private int weight = 100; // 验证码图片的长和宽
|
private int height = 40;
|
private String text; // 用来保存验证码的文本内容
|
private Random r = new Random(); // 获取随机数对象
|
// private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
|
// //字体数组
|
// 字体数组
|
private String[] fontNames = { "Georgia" };
|
// 验证码数组
|
private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
|
// private String codes = "用来保存验证码的文本内容";
|
|
/**
|
* 获取随机的颜色
|
*
|
* @return
|
*/
|
private Color randomColor() {
|
int r = this.r.nextInt(225); // 这里为什么是225，因为当r，g，b都为255时，即为白色，为了好辨认，需要颜色深一点。
|
int g = this.r.nextInt(225);
|
int b = this.r.nextInt(225);
|
return new Color(r, g, b); // 返回一个随机颜色
|
}
|
|
/**
|
* 获取随机字体
|
*
|
* @return
|
*/
|
private Font randomFont() {
|
int index = r.nextInt(fontNames.length); // 获取随机的字体
|
String fontName = fontNames[index];
|
int style = r.nextInt(4); // 随机获取字体的样式，0是无样式，1是加粗，2是斜体，3是加粗加斜体
|
int size = r.nextInt(10) + 24; // 随机获取字体的大小
|
return new Font(fontName, style, size); // 返回一个随机的字体
|
}
|
|
/**
|
* 获取随机字符
|
*
|
* @return
|
*/
|
private char randomChar() {
|
int index = r.nextInt(codes.length());
|
return codes.charAt(index);
|
}
|
|
/**
|
* 画干扰线，验证码干扰线用来防止计算机解析图片
|
*
|
* @param image
|
*/
|
private void drawLine(BufferedImage image) {
|
int num = 5 + r.nextInt(10); // 定义干扰线的数量
|
Graphics2D g = (Graphics2D) image.getGraphics();
|
for (int i = 0; i < num; i++) {
|
int x1 = r.nextInt(weight);
|
int y1 = r.nextInt(height);
|
int x2 = r.nextInt(weight);
|
int y2 = r.nextInt(height);
|
g.setColor(randomColor());
|
g.drawLine(x1, y1, x2, y2);
|
}
|
}
|
|
/**
|
* 创建图片的方法
|
*
|
* @return
|
*/
|
private BufferedImage createImage() {
|
// 创建图片缓冲区
|
BufferedImage image = new BufferedImage(weight, height, BufferedImage.TYPE_INT_RGB);
|
// 获取画笔
|
Graphics2D g = (Graphics2D) image.getGraphics();
|
// 设置背景色随机
|
g.setColor(new Color(255, 255, r.nextInt(245) + 10));
|
g.fillRect(0, 0, weight, height);
|
// 返回一个图片
|
return image;
|
}
|
|
/**
|
* 获取验证码图片的方法
|
*
|
* @return
|
*/
|
public BufferedImage getImage() {
|
BufferedImage image = createImage();
|
Graphics2D g = (Graphics2D) image.getGraphics(); // 获取画笔
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < 4; i++) // 画四个字符即可
|
{
|
String s = randomChar() + ""; // 随机生成字符，因为只有画字符串的方法，没有画字符的方法，所以需要将字符变成字符串再画
|
sb.append(s); // 添加到StringBuilder里面
|
float x = i * 1.0F * weight / 4; // 定义字符的x坐标
|
g.setFont(randomFont()); // 设置字体，随机
|
g.setColor(randomColor()); // 设置颜色，随机
|
g.drawString(s, x, height - 5);
|
}
|
this.text = sb.toString();
|
drawLine(image);
|
return image;
|
}
|
|
public String getBase64() {
|
BufferedImage image = this.getImage();
|
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
|
try {
|
ImageIO.write(image, "JPEG", outputStream);
|
} catch (IOException e) {
|
// TODO Auto-generated catch block
|
e.printStackTrace();
|
}
|
String data = "data:image/jpg;base64," + DatatypeConverter.printBase64Binary(outputStream.toByteArray());
|
return data;
|
}
|
|
/**
|
* 获取验证码文本的方法
|
*
|
* @return
|
*/
|
public String getText() {
|
return text;
|
}
|
|
public static void output(BufferedImage image, OutputStream out) throws IOException // 将验证码图片写出的方法
|
{
|
ImageIO.write(image, "JPEG", out);
|
}
|
|
public static void main(String[] args) {
|
ImageVerificationCodeUtil ivc = new ImageVerificationCodeUtil(); // 用我们的验证码类，生成验证码类对象
|
BufferedImage image = ivc.getImage(); // 获取验证码
|
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
|
try {
|
ImageIO.write(image, "JPEG", outputStream);
|
} catch (IOException e) {
|
// TODO Auto-generated catch block
|
e.printStackTrace();
|
}
|
String data = "data:image/jpg;base64," + DatatypeConverter.printBase64Binary(outputStream.toByteArray());
|
// System.out.println(data);
|
}
|
}
|
