微信二维码下载

问题场景：

　　微信个人二维码要与一张图片合成，二维码是微信用户个人二维码，发现不能合成，原因未知，解决方案是将微信个人二维码下载到本地，再合成，合成代码这里不做演示，只演示个下载的代码

package link;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by Administrator on 2017/7/18 0018.
 */
public class DownLoadQrCode {


    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        download("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=gQFH8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyVm1rZ0VkSmVhV1QxMDAwME0wM0wAAgQzCmZZAwQAAAAA", "2222.png","c:\\image\\");
    }



    public static void download(String urlString, String filename,String savePath) throws Exception {
        InputStream is = null;
        OutputStream os = null;
        try {
            HostnameVerifier hv = new HostnameVerifier() {
                public boolean verify(String urlHostName, SSLSession session) {
                    System.out.println("Warning: URL Host: " + urlHostName + " vs. "
                            + session.getPeerHost());
                    return true;
                }
            };

            // 构造URL
            URL url = new URL(urlString);

            trustAllHttpsCertificates();
            HttpsURLConnection.setDefaultHostnameVerifier(hv);

            // 打开连接
            URLConnection con = url.openConnection();
            //设置请求超时为5s
            con.setConnectTimeout(5 * 1000);
            // 输入流
            is = con.getInputStream();

            // 1K的数据缓冲
            byte[] bs = new byte[1024];
            // 读取到的数据长度
            int len;
            // 输出的文件流
            File sf = new File(savePath);
            if (!sf.exists()) {
                sf.mkdirs();
            }
            os = new FileOutputStream(sf.getPath() + File.separator + filename);
            // 开始读取
            while ((len = is.read(bs)) != -1) {
                os.write(bs, 0, len);
            }

        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(is!=null){
                is.close();
            }
            if(os!=null){
                os.flush();
                // 完毕，关闭所有链接
                os.close();
            }
        }
    }

    private static void trustAllHttpsCertificates() throws Exception {
        javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];
        javax.net.ssl.TrustManager tm = new miTM();
        trustAllCerts[0] = tm;
        javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext
                .getInstance("SSL");
        sc.init(null, trustAllCerts, null);
        javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc
                .getSocketFactory());
    }

    static class miTM implements javax.net.ssl.TrustManager,
            javax.net.ssl.X509TrustManager {
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return null;
        }

        public boolean isServerTrusted(
                java.security.cert.X509Certificate[] certs) {
            return true;
        }

        public boolean isClientTrusted(
                java.security.cert.X509Certificate[] certs) {
            return true;
        }

        public void checkServerTrusted(
                java.security.cert.X509Certificate[] certs, String authType)
                throws java.security.cert.CertificateException {
            return;
        }

        public void checkClientTrusted(
                java.security.cert.X509Certificate[] certs, String authType)
                throws java.security.cert.CertificateException {
            return;
        }
    }
}