java调用微信小程序API createwxaqrcode 产生二维码

分享者：低调小虾米

调用产生二维码的接口一直乱码，一直没想出为什么乱码，囧，郁闷之极，还好九爷慷慨分享了文章，得知返回的是二进制，createwxaqrcode接口并不复杂，只是在官方接口并没声明返回内容，只要知道返回的内容就好办了，代码如下

post请求

public static String httpPostWithJSON(String url, String json)
                        throws Exception {
                String result = null;
                // 将JSON进行UTF-8编码,以便传输中文
                String encoderJson = URLEncoder.encode(json, HTTP.UTF_8);
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.addHeader(HTTP.CONTENT_TYPE, APPLICATION_JSON);
                StringEntity se = new StringEntity(json);
                se.setContentType(CONTENT_TYPE_TEXT_JSON);
                se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                                APPLICATION_JSON));
                httpPost.setEntity(se);
                // httpClient.execute(httpPost);
                HttpResponse response = httpClient.execute(httpPost);
                if (response != null) {
                        HttpEntity resEntity = response.getEntity();
                        if (resEntity != null) {
                                InputStream instreams = resEntity.getContent(); 
                                saveToImgByInputStream(instreams, "D:\\", "apr.jpg");
                        }
                }
                return result;
        }

将二进制转换成文件保存

/**
     * 将二进制转换成文件保存
     * @param instreams 二进制流
     * @param imgPath 图片的保存路径
     * @param imgName 图片的名称
     * @return 
     *      1：保存正常
     *      0：保存失败
     */
    public static int saveToImgByInputStream(InputStream instreams,String imgPath,String imgName){
        int stateInt = 1;
        if(instreams != null){
            try {
                File file=new File(imgPath,imgName);//可以是任何图片格式.jpg,.png等
                FileOutputStream fos=new FileOutputStream(file);
                byte[] b = new byte[1024];
                int nRead = 0;
                while ((nRead = instreams.read(b)) != -1) {
                    fos.write(b, 0, nRead);
                }
                fos.flush();
                fos.close();                
            } catch (Exception e) {
                stateInt = 0;
                e.printStackTrace();
            } finally {
            }
        }
        return stateInt;
    }

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