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+package com.huimv.mobile.utils;
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+
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+import javax.imageio.ImageIO;
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+import java.awt.*;
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+import java.awt.image.BufferedImage;
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+import java.io.IOException;
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+import java.io.OutputStream;
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+import java.util.Random;
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+
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+public class CheckNumber {
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+ private int w = 70;//验证码图片宽
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+ private int h = 35;//验证码图片高
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+ private Random r = new Random();//随机对象
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+ // {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}
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+ private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
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+ // 可选字符
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+ private String codes = "0123456789abcdefghjkmnopqrstuvwxyz";
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+ // 背景色
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+ private Color bgColor = new Color(255, 255, 255);
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+ // 验证码上的文本
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+ private String text;
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+
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+ // 生成随机的颜色
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+ private Color randomColor() {
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+ int red = r.nextInt(150);
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+ int green = r.nextInt(150);
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+ int blue = r.nextInt(150);
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+ return new Color(red, green, blue);
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+ }
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+
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+ // 生成随机的字体
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+ private Font randomFont() {
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+ int index = r.nextInt(fontNames.length);
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+ String fontName = fontNames[index];//生成随机的字体名称
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+ int style = r.nextInt(4);//生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)
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+ int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28
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+ //Font对象的参数:1.字体名称2.字体样式3.字体大小
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+ return new Font(fontName, style, size);
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+ }
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+
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+ // 传入一个BufferImage对象,给图片画干扰线
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+ private void drawLine(BufferedImage image) {
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+ int num = 3;//一共画3条
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+ Graphics2D g2 = (Graphics2D) image.getGraphics();
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+ for (int i = 0; i < num; i++) {//生成两个点的坐标,即4个值
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+ int x1 = r.nextInt(w);
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+ int y1 = r.nextInt(h);
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+ int x2 = r.nextInt(w);
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+ int y2 = r.nextInt(h);
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+ g2.setStroke(new BasicStroke(1.5F));
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+ g2.setColor(Color.BLUE); //干扰线是蓝色
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+ g2.drawLine(x1, y1, x2, y2);//画线
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+ }
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+ }
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+
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+ // 随机生成一个字符
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+ private char randomChar() {
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+ int index = r.nextInt(codes.length());
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+ return codes.charAt(index);
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+ }
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+
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+ // 创建BufferedImage
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+ private BufferedImage createImage() {
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+ BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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+ Graphics2D g2 = (Graphics2D) image.getGraphics();
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+ g2.setColor(this.bgColor);
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+ g2.fillRect(0, 0, w, h);
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+ return image;
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+ }
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+
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+ // 调用这个方法得到验证码
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+ public BufferedImage getImage() {
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+ BufferedImage image = createImage();//创建图片缓冲区
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+ Graphics2D g2 = (Graphics2D) image.getGraphics();//得到绘制环境
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+ StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本
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+ // 向图片中画4个字符
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+ for (int i = 0; i < 4; i++) {//循环四次,每次生成一个字符
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+ String s = randomChar() + "";//随机生成一个字母
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+ sb.append(s); //把字母添加到sb中
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+ float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标
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+ g2.setFont(randomFont()); //设置随机字体
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+ g2.setColor(randomColor()); //设置随机颜色
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+ g2.drawString(s, x, h - 5); //画图
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+ }
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+ this.text = sb.toString(); //把生成的字符串赋给了this.text
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+ drawLine(image); //添加干扰线
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+ return image;
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+ }
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+
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+ // 返回验证码图片上的文本
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+ public String getText() {
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+ return text;
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+ }
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+
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+ // 保存图片到指定的输出流
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+ public static void output(BufferedImage image, OutputStream out)
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+ throws IOException {
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+ ImageIO.write(image, "JPEG", out);
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+ }
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+}
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