验证码识别技术（一）

一，图片下载方法

如果在源文件中，验证码是img形式，就非常好下载处理了。这里就不在陈述了，目前好多验证码都是数据流形式，需要编程处理，首先，要获取验证码的地址，例如：地址为http://aaa.bbb.ccc/code

public static void GetURL() throws ClientProtocolException, IOException {

        // 1，获取图片
        @SuppressWarnings("deprecation")
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost("http://aaa.bbb.ccc/code");//图片的URL
        httpPost.setHeader(CommonConst.UserAgent, CommonConst.HttpAgent);
        httpPost.setHeader("Cache-Control", "max-age=0");
        httpPost.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        httpPost.setHeader("Accept-Encoding", "gzip,deflate,sdch");
        httpPost.setHeader("Accept-Language", "en-US,en;q=0.8");
        httpPost.setHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.3");
        httpPost.setHeader("Accept-Encoding", "gzip,deflate,sdch");

        HttpResponse response = httpclient.execute(httpPost);
        HttpEntity entity = response.getEntity();

        byte[] imgArray = new byte[200 * 60];//下载图片后，看图片的大小
        if (entity != null) {
            java.io.InputStream instreams = entity.getContent();
            instreams.read(imgArray);
            httpPost.abort();
        }

        // 2,保存图片
        mWriterPicture("E:\\testc\\1原始验证码\\a.jpg", imgArray);
    }

// 写入图片
    public static void mWriterPicture(String newFileName, byte[] b)throws IOException {
        try {
            File file = new File(newFileName);
            FileOutputStream fStream = new FileOutputStream(file);
            fStream.write(b);
            fStream.close();
            System.out.println("图片创建成功    " + b.length);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }