微信公众号获取token，上传素材

public static JSONObject getToken(String appId,String appSecret){

     String url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+appId+"&secret="+appSecret;
     HttpURLConnection con = null;
     BufferedReader bufferedReader=null;
     try {
         URL urlObj = new URL(url);
         // 打开连接
         con = (HttpURLConnection) urlObj.openConnection();
         // 设置请求通用参数
         con.setRequestProperty("accept", "*/*");
         con.setRequestProperty("connection", "Keep-Alive");
         con.connect();
         bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
         
         StringBuffer buffer = new StringBuffer();
         String line = null;
         while ((line = bufferedReader.readLine()) != null) {
             buffer.append(line);
         }
         String result = buffer.toString();
         JSONObject resultJSON = new JSONObject(result);
         if (resultJSON != null) {
             System.out.println(resultJSON.toString());
            if(null!=resultJSON.get("access_token")) {
                return resultJSON;
            }else {
                throw new Exception("获取微信token失败，APPID="+appId+";微信消息："+resultJSON.getString("errmsg")+",code="+resultJSON.getString("errcode"));
            }
         }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if(null!=con) {
            con.disconnect();
        }
    }
   return null;
}



/**
 * 发送请求
 * @Desc 
 */
public static  String connectHttpsByPost(String url,String token,String type, String KK, File file) throws Exception {
    if(token==null) {
        token = getToken("1111", "1111").get("access_token").toString();
    }
    String path = "https://api.weixin.qq.com/cgi-bin/media/uploadimg?access_token=" + token;
    path = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=" + token;
    
    URL urlObj = new URL(path);
    //连接
    HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
    String result = null;
    
    con.setDoInput(true);
    con.setDoOutput(true);
    con.setUseCaches(false);// post方式不能使用缓存

    // 设置请求头信息
    con.setRequestProperty("Connection", "Keep-Alive");
    con.setRequestProperty("Charset", "UTF-8");
    // 设置边界
    String BOUNDARY = "----------" + System.currentTimeMillis();
    con.setRequestProperty("Content-Type", "multipart/form-data; boundary="+ BOUNDARY);

    // 请求正文信息
    // 第一部分：
    StringBuilder sb = new StringBuilder();
    sb.append("--"); // 必须多两道线
    sb.append(BOUNDARY);
    sb.append("\r\n");
    sb.append("Content-Disposition: form-data;name=\"media\";filelength=\"" + file.length() + "\";filename=\"" + file.getName() + "\"\r\n");
    sb.append("Content-Type:application/octet-stream\r\n\r\n");
    byte[] head = sb.toString().getBytes("utf-8");
    // 获得输出流
    OutputStream out = new DataOutputStream(con.getOutputStream());
    // 输出表头
    out.write(head);

    // 文件正文部分
    // 把文件已流文件的方式 推入到url中
    DataInputStream in = new DataInputStream(new FileInputStream(file));
    int bytes = 0;
    byte[] bufferOut = new byte[1024];
    while ((bytes = in.read(bufferOut)) != -1) {
        out.write(bufferOut, 0, bytes);
    }
    in.close();
    // 结尾部分
    if(null!=KK) {
        out.write(("--" + BOUNDARY + "\r\n").getBytes());
        out.write("Content-Disposition: form-data; name=\"description\";\r\n\r\n".getBytes("utf-8"));
        out.write(String.format("{\"title\":\"%s\", \"introduction\":\"%s\"}",file.getName(),file.getName()).getBytes("utf-8"));
    }
    byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
    out.write(foot);
    out.flush();
    out.close();
    StringBuffer buffer = new StringBuffer();
    BufferedReader reader = null;
    try {
        // 定义BufferedReader输入流来读取URL的响应
        reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String line = null;
        while ((line = reader.readLine()) != null) {
            buffer.append(line);
        }
        if (result == null) {
            result = buffer.toString();
        }
    } catch (IOException e) {
        System.out.println("发送POST请求出现异常！" + e);
        e.printStackTrace();
    } finally {
        if (reader != null) {
            reader.close();
        }
    }
    return result;
}