求解读这段代码

[dimi360]

public static String conSvr() { (URL)null; (InputStream)null; StringBuilder stringBuilder = new StringBuilder(); StringBuilder stringBuilder2 = new StringBuilder(); stringBuilder.append("wap.baidu.com"); try { StringBuffer stringBuffer = new StringBuffer(); StringBuffer stringBuffer2 = new StringBuffer(); StringBuffer stringBuffer3 = new StringBuffer(); URL uRL = new URL(stringBuffer.append(stringBuffer2.append(stringBuffer3.append("http://").append(stringBuilder.toString()).toString()).append("/").toString()).append(stringBuilder2.toString()).toString()); HttpURLConnection httpURLConnection = (HttpURLConnection)uRL.openConnection(); httpURLConnection.addRequestProperty("Host", stringBuilder.toString()); if (httpURLConnection.getResponseCode() != 200) return null; InputStream inputStream = httpURLConnection.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream); BufferedReader bufferedReader = new BufferedReader((Reader)inputStreamReader); StringBuilder stringBuilder3 = new StringBuilder(); (String)null; do { String string2; if ((string2 = bufferedReader.readLine()) == null) { return stringBuilder3.toString(); } StringBuffer stringBuffer4 = new StringBuffer(); stringBuilder3.append(stringBuffer4.append(string2).append("\n").toString()); } while (true); } catch (IOException var9_13) { return null; } } 上面代码中的wap.baidu.com无法获取到内容的时候，怎么加入预先准备好的内容以保证程序正常运行呢？