如何從Java中的HTTP請求獲取JSON對象

Question

我現在正在嘗試使用Java Cord中的HTTP請求獲取JSON對象。

我想知道如何在下面的代碼中獲取響應或JSON對象。

請告訴我。

（在此程序中，我嘗試獲取文章“ New York”的Wikipedia類別。）

 String requestURL = "http://en.wikipedia.org/w/api.php?action=query&prop=categories&format=json&clshow=!hidden&cllimit=10&titles=" + words[i];
 URL wikiRequest = new URL(requestURL);
 URLConnection connection = wikiRequest.openConnection();  
 connection.setDoOutput(true);  

                    /**** I'd like to get response here. ****/

 JSONObject json = Util.parseJson(response);

Answer 1

JSONTokener僅2行代碼

JSONTokener tokener = new JSONTokener(wikiRequest.openStream());
JSONObject root = new JSONObject(tokener);

Answer 2

Scanner scanner = new Scanner(wikiRequest.openStream());
String response = scanner.useDelimiter("\\Z").next();
JSONObject json = Util.parseJson(response);
scanner.close();

Answer 3

如果您使用的是URLConnection，則應該能夠讀取流而不是獲取響應對象：

BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

請參閱： http : //docs.oracle.com/javase/tutorial/networking/urls/readingWriting.html

Answer 4

使用corn-httpclient和corn-converter的示例實現

HttpClient client = new HttpClient(new URI(http://en.wikipedia.org/w/api.php?action=query&prop=categories&format=json&clshow=!hidden&cllimit=10&titles=" + words[i]));
HttpResponse response = client.sendData(HTTP_METHOD.GET);
if (! response.hasError()) {
String jsonString = response.getData();
JsTypeComplex jsonResponse =  (JsTypeComplex) JsonStringParser.parseJsonString(jsonString);
JsTypeList resultsArr = (JsTypeList) jsonResponse.get("results");

Maven依賴項：

<dependency>
    <groupId>net.sf.corn</groupId>
    <artifactId>corn-httpclient</artifactId>
    <version>1.0.0</version>
</dependency>
<dependency>
    <groupId>net.sf.corn</groupId>
    <artifactId>corn-converter</artifactId>
    <version>1.0.0</version>
</dependency>