Java的遊離鹼查詢

Question

我想讀遊離鹼查詢與Java的結果：

URL url = null; 
String inputLine; 

try{ 
    url = new URL("https://www.googleapis.com/freebase/v1/mqlread?query={\"id\":\"/en/madonna\", \"name\": null, \"type\":\"/base/popstra/celebrity\",\"/base/popstra/celebrity/friendship\": [{\"participant\": [] }] }"); 

} catch (MalformedURLException e) { 
    e.printStackTrace(); 
} 
BufferedReader in; 
try { 
    URLConnection con = url.openConnection(); 
    con.setReadTimeout(1000); //1 second 
    in = new BufferedReader(new InputStreamReader(con.getInputStream())); 
    while ((inputLine = in.readLine()) != null) { 
    System.out.println(inputLine); 
} 
in.close(); 

} catch (IOException e) { 
    e.printStackTrace(); 
} 

不過，我發現了以下錯誤：

java.io.IOException: Server returned HTTP response code: 400 for URL:  https://www.googleapis.com/freebase/v1/mqlread?query={ "id":"/en/madonna", "name": null, "type": "/base/popstra/celebrity","/base/popstra/celebrity/friendship": [{ "participant": [] }] } 

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) 
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) 
at FreebaseCelebrities.main(FreebaseCelebrities.java:66) 

我已經做了這之前（與其他請求），它的工作，所以這裏有什麼問題？

Answer 1

If've got it !!!

的API不解析emply場所正確使用本：

url = new URL("https://www.googleapis.com/freebase/v1/mqlread?query={\"id\":\"/en/madonna\", \"name\": null, \"type\":\"/base/popstra/celebrity\",\"/base/popstra/celebrity/friendship\": [{\"participant\": [] }] }".replace(" ", "")); 

Answer 2

創建URL時，試試這個代碼：

try { 
    String query = "{\"id\":\"/en/madonna\", \"name\": null, \"type\":\"/base/popstra/celebrity\",\"/base/popstra/celebrity/friendship\": [{\"participant\": [] }] }"; 
    url = new URL("https://www.googleapis.com/freebase/v1/mqlread?query="+URLEncoder.encode(query, "UTF-8")); 
} catch (UnsupportedEncodingException e) { 
    e.printStackTrace(); 
} catch (MalformedURLException e) { 
    e.printStackTrace(); 
} 

你需要URL編碼的查詢字符串參數。