url.openStream()连接超时设置

第一种情况 会出现超时连接时间很长

URL.openStream()可能会出现连接超时的情况，导致读取时间很长，三四分钟的样子

URL url2g = new URL(url_2g);
BufferedReader reader2g = null;
try {
    reader2g = new BufferedReader(new InputStreamReader(url2g.openStream(), "UTF-8"));
} catch (IOException e) {
    logger.error("调用moji接口失败", e);
}

第二种情况 通过设置连接超时时间

先使用URL的openConnection方法获得一个HttpUrlConnection对象，然后该对象有setConnectTimeout和setReadTimeout两个方法，分别设置两种超时，设置完之后再调用该connection的getInputStream获得流即可。其实url的openStream就是把openConnection和getInputStream连起来调用了。

String url_2g = WeatherUtil.getUrl(lon_2g, lat_2g);
URL url2g = null;
HttpURLConnection urlCon2g = null;
try {
    url2g = new URL(url_2g);
    //设置连接超时的时间
    urlCon2g = (HttpURLConnection) url2g.openConnection();
    urlCon2g.setConnectTimeout(1000);
    urlCon2g.setReadTimeout(1000);
} catch (Exception e) {
    logger.error("URL格式错误", e);
}
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader2g = null;
try {
    inputStream = urlCon2g.getInputStream();
    inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
    reader2g = new BufferedReader(inputStreamReader);
} catch (IOException e) {
    logger.error(storeLocationVO.getStoreCode() + ",调用天气接口失败", e);
}