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Ich benutze diesen Code für Get Json, aber es gibt FileNotFoundException zurück. In Browset funktioniert es. Ich verstehe nicht, warum es nicht in Java funktioniert ... Ich versuche, HttpsUrlConnection zu verwenden, aber Ergebnis nicht zu ändern.Google Bücher Filenotfound Java
String url = "https://www.googleapis.com/books/v1/volumes";
HashMap<String, String> params = new HashMap<String, String>();
params.put("q", "isbn:9785090212779");
StringBuilder postData = new StringBuilder();
if (params != null)
for (Map.Entry<String, String> param : params.entrySet()) {
if (postData.length() != 0) postData.append('&');
postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
postData.append('=');
postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
}
byte[] postDataBytes = postData.toString().getBytes("UTF-8");
HttpsURLConnection urlc = (HttpsURLConnection)
new URL(url).openConnection();
urlc.setDoOutput(true);
urlc.setRequestMethod("GET");
urlc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
urlc.setRequestProperty("charset", "UTF-8");
urlc.setRequestProperty("Content-Length", Integer.toString(postDataBytes.length));
DataOutputStream wr;
wr = new DataOutputStream(urlc.getOutputStream());
wr.write(postDataBytes);
wr.flush();
wr.close();
urlc.setConnectTimeout(2000);
DataInputStream is = new DataInputStream(urlc.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
urlc.disconnect();
System.out.println(sb.toString());
Ausnahme:
Exception in thread "main" java.io.FileNotFoundException: https://www.googleapis.com/books/v1/volumes
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1836)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
at Main.main(Main.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Sie können die entsprechenden Änderungen vornehmen, wie im folgenden Link erwähnt: http://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/ – AbhishekAsh
Test 2 - Http POST-Anforderung senden Ausnahme im Thread "Haupt" java.io.FileNotFoundException: https://selfsolve.apple.com/wcResults.do \t bei sun.reflect.NativeConstructorAccessorImpl.newInstance0 (Native –