解决HttpURLConnection.getInputStream()报400异常

用Java访问第三方接口时报400,打断点查看时在getInputStream()方法执行时抛出了异常
解决:判断响应码getResponseCode()不是200,201,202的话,使用getErrorStream()而不是直接getInputStream()

/**
	 * 获取url网址返回的数据内容
	 * @param urlStr
	 * @return
	 */
	public static String loadURL(String urlStr){
		try{  
	        URL url = new URL(urlStr);  
	        HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();	              
	        urlConnection.setRequestMethod("POST");
		    urlConnection.connect();
			InputStream inputStream;
			//--------------------**判断**----------------------
			if (urlConnection.getResponseCode() != HttpURLConnection.HTTP_OK
				||urlConnection.getResponseCode() != HttpURLConnection.HTTP_CREATED
				||urlConnection.getResponseCode() != HttpURLConnection.HTTP_ACCEPTED ) {
				inputStream = urlConnection.getErrorStream();
			}
			else{
				inputStream = urlConnection.getInputStream();
			}
			BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
			StringBuffer sbf = new StringBuffer();
			String temp = null;
			while ((temp = br.readLine()) != null) {
				sbf.append(temp);
				sbf.append("\r\n");
			}
			String result = sbf.toString();
			//ConvertToString(inputStream);
			return result;
		}catch(IOException e){
		    e.printStackTrace();
		    return null;
		}
	}