验证码生成

最新推荐文章于 2025-08-12 10:37:59 发布

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#验证码生成 #小代码

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本文介绍了一种使用Java生成包含随机字符的验证码图片的方法。通过设置图片尺寸、字体样式及颜色等属性，实现了验证码的生成，并将其以PNG格式输出到HTTP响应中。

@RequestMapping(“/identifyCode”)
public void identifyCode(HttpServletResponse response,HttpSession httpSession){
BufferedImage bufferedImage = new BufferedImage(150,40,BufferedImage.TYPE_INT_RGB);
Graphics graphics = bufferedImage.createGraphics();
graphics.setColor(Color.red);
graphics.setFont(new Font(“黑体”,Font.BOLD,32));
String code =getCode().toString();
httpSession.setAttribute(“code”,code);
graphics.drawString(code,10,25);
try {
ImageIO.write(bufferedImage,”png”,response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}

}
public StringBuffer getCode(){
    Random random = new Random();
    StringBuffer code = new StringBuffer();
    String[] allStr = new String[]{"1","2","3","4","5","6","7","8","8","a","b","c","d","e","f","g","h","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
    for(int i = 0; i < 6; i++){
       code.append(allStr[random.nextInt(allStr.length)]);
    }
    return code;
}
![实现效果](https://img-blog.youkuaiyun.com/20180815100107576?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FsY2Vkb0F0dGhpcw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)