小程序生成二维码

官方文档：获取二维码

这里使用其中的接口B：

字段含义写的很清楚，需要注意的是page是小程序中已发布页面，且不能携带参数，参数放在scene中。请求成功的话微信服务器返回的是输入流，需要自行保存，以下看代码：

public class Test
{
public static void main(String[] args)
{
try
{
URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=你的access_token");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");// 提交模式
// conn.setConnectTimeout(10000);//连接超时单位毫秒
// conn.setReadTimeout(2000);//读取超时单位毫秒
// 发送POST请求必须设置如下两行
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
// 获取URLConnection对象对应的输出流
PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
JSONObject paramJson = new JSONObject();
paramJson.put("scene", "a=1234567890");
paramJson.put("page", "pages/index/index");
paramJson.put("width", 430);
paramJson.put("auto_color", true);
/**
* line_color生效
* paramJson.put("auto_color", false);
* JSONObject lineColor = new JSONObject();
* lineColor.put("r", 0);
* lineColor.put("g", 0);
* lineColor.put("b", 0);
* paramJson.put("line_color", lineColor);
* */

printWriter.write(paramJson.toString());
// flush输出流的缓冲
printWriter.flush();
//开始获取数据
BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
OutputStream os = new FileOutputStream(new File("/Users/Xxxx/Music/abc.png"));
int len;
byte[] arr = new byte[1024];
while ((len = bis.read(arr)) != -1)
{
os.write(arr, 0, len);
os.flush();
}
os.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
---------------------

   /**
   * 获取小程序的token_access
   *
   * @param token
   * @param create_time
   * @param secret
   * @param user_name
   * @return
   */
   @ResponseBody
   @RequestMapping(value = "getWXACodeUnlimit")
   public ResultCode getWXACodeUnlimit(
           @RequestParam(value = "scene", required = false) String scene,
           HttpServletRequest request) {
       System.out.println("111=====" + new Date());
       // 缺少参数
       if (StringUtils.isBlank(scene)) {
           return ResultCodeDataStr.ERROR("invalid argument");
       }

String md5 = MD5Util.string2MD5(scene);
// System.out.println(System.getProperty("user.dir"));

String imageStorage = PropertiesUtil.getProperties_1(
"resources/project.properties", "data.storage");

String imageDomain = PropertiesUtil.getProperties_1(
"resources/project.properties", "images.domain");

       // String pic = request.getRealPath("/") + "\\images\\qrcode\\" + md5
       // + ".png";
       // System.out.println(request.getRealPath("/"));
       String pic = imageStorage + "/images/qrcode/" + md5 + ".png";
       String pic1 = imageDomain + "/images/qrcode/" + md5 + ".png";

       /*
       * String tempImage = imageStorage + "/images/qrcode"; File tempFile =
       * new File(tempImage); if (!tempFile.exists()) { tempFile.mkdirs(); }
       */

       String expires_in = redisDBService.GET("qrcode:accessToken");
       String res = null;
       if (expires_in == null) {
           res = tokenServiceImpl.getAccessToken();
           redisDBService.SET("qrcode:accessToken", res, 7000);
       } else {
           res = expires_in;
       }
       System.out.println("start=====" + new Date());
       try {
           URL url = new URL(
                   "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="
                           + res);
           HttpURLConnection httpURLConnection = (HttpURLConnection) url
                   .openConnection();
           httpURLConnection.setRequestMethod("POST");// 提交模式
           // conn.setConnectTimeout(10000);//连接超时单位毫秒
           // conn.setReadTimeout(2000);//读取超时单位毫秒
           // 发送POST请求必须设置如下两行
           httpURLConnection.setDoOutput(true);
           httpURLConnection.setDoInput(true);
           // 获取URLConnection对象对应的输出流
           PrintWriter printWriter = new PrintWriter(
                   httpURLConnection.getOutputStream());
           // 发送请求参数
           JSONObject paramJson = new JSONObject();
           paramJson.put("scene", scene);
           // paramJson.put("width", 430);
           // paramJson.put("auto_color", true);
           /**
           * line_color生效 paramJson.put("auto_color", false); JSONObject
           * lineColor = new JSONObject(); lineColor.put("r", 0);
           * lineColor.put("g", 0); lineColor.put("b", 0);
           * paramJson.put("line_color", lineColor);
           * */

           printWriter.write(paramJson.toString());
           // flush输出流的缓冲
           printWriter.flush();
           // 开始获取数据
           BufferedInputStream bis = new BufferedInputStream(
                   httpURLConnection.getInputStream());
           // String res = request.getContextPath();
           // System.out.println(pic);
           OutputStream os = new FileOutputStream(new File(pic));
           int len;
           byte[] arr = new byte[1024];
           while ((len = bis.read(arr)) != -1) {
               os.write(arr, 0, len);
               os.flush();
           }
           os.close();
       } catch (Exception e) {
           e.printStackTrace();
       }
       System.out.println("end=====" + new Date());
       return ResultCodeDataStr.SUCCESS(pic1);

}

小程序生成二维码

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