Android 获取随机验证码功能示例
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2023-11-13 16:34:10
验证码功能在各大网站都能用到,下面小编通过实例代码给大家分享android 获取随机验证码功能,具体代码如下所示:
package cn.hk.image;...
验证码功能在各大网站都能用到,下面小编通过实例代码给大家分享android 获取随机验证码功能,具体代码如下所示:
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); } }
以上所述是小编给大家介绍的android 获取随机验证码功能示例,希望对大家有所帮助