Android应用中怎么对随机验证码进行获取?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
创新互联建站是一家专注于网站设计制作、成都做网站与策划设计,乐业网站建设哪家好?创新互联建站做网站,专注于网站建设10多年,网设计领域的专业建站公司;建站业务涵盖:乐业等地区。乐业做网站价格咨询:13518219792具体方法如下:
package cn.hk.image; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import javax.imageio.ImageIO; public class VerifyCode { private int w = 70; private int h = 35; private Random r = new Random(); // {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"} private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"}; // 可选字符 private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ"; // 背景色 private Color bgColor = new Color(255, 255, 255); // 验证码上的文本 private String text ; // 生成随机的颜色 private Color randomColor () { int red = r.nextInt(150); int green = r.nextInt(150); int blue = r.nextInt(150); return new Color(red, green, blue); } // 生成随机的字体 private Font randomFont () { int index = r.nextInt(fontNames.length); String fontName = fontNames[index];//生成随机的字体名称 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) int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28 return new Font(fontName, style, size); } // 画干扰线 private void drawLine (BufferedImage image) { int num = 3;//一共画3条 Graphics2D g2 = (Graphics2D)image.getGraphics(); for(int i = 0; i < num; i++) {//生成两个点的坐标,即4个值 int x1 = r.nextInt(w); int y1 = r.nextInt(h); int x2 = r.nextInt(w); int y2 = r.nextInt(h); g2.setStroke(new BasicStroke(1.5F)); g2.setColor(Color.BLUE); //干扰线是蓝色 g2.drawLine(x1, y1, x2, y2);//画线 } } // 随机生成一个字符 private char randomChar () { int index = r.nextInt(codes.length()); return codes.charAt(index); } // 创建BufferedImage,图片缓存区 private BufferedImage createImage () { BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = (Graphics2D)image.getGraphics(); g2.setColor(this.bgColor); g2.fillRect(0, 0, w, h); return image; } // 调用这个方法得到验证码 public BufferedImage getImage () { BufferedImage image = createImage();//创建图片缓冲区 Graphics2D g2 = (Graphics2D)image.getGraphics();//得到绘制环境 StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本 // 向图片中画4个字符 for(int i = 0; i < 4; i++) {//循环四次,每次生成一个字符 String s = randomChar() + "";//随机生成一个字母 sb.append(s); //把字母添加到sb中 float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标 g2.setFont(randomFont()); //设置随机字体 g2.setColor(randomColor()); //设置随机颜色 g2.drawString(s, x, h-5); //画图 } this.text = sb.toString(); //把生成的字符串赋给了this.text drawLine(image); //添加干扰线 return image; } // 返回验证码图片上的文本 public String getText () { return text; } // 保存图片到指定的输出流 public static void output (BufferedImage image, OutputStream out) throws IOException { ImageIO.write(image, "JPEG", out); } }