我收到此错误:
java.io.IOException:服务器返回HTTP响应代码:400为URL:https://graph.facebook.com/search?q=java&type=post
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
在java.net.URL.openStream(未知来源)
在Main.main(Main.java:19)
代码:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
import org.json.JSONObject;
import javax.json.*;
public class Main {
public static void main(String[] args) {
try {
URL url = new URL("https://graph.facebook.com/search?q=java&type=post");
InputStream is = url.openStream();
JsonReader rdr = Json.createReader(is);
JsonObject obj = rdr.readObject();
JsonArray results = obj.getJsonArray("data");
for (JsonObject result : results.getValuesAs(JsonObject.class)) {
System.out.print(result.getJsonObject("from").getString("name"));
System.out.print(": ");
System.out.println(result.getString("message", ""));
System.out.println("-----------");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
我不明白为什么?
答案 0 :(得分:0)
当在浏览器中尝试该URL时,我得到回复:
{
"error": {
"message": "An access token is required to request this resource.",
"type": "OAuthException",
"code": 104,
"fbtrace_id": "Du6VLoot53K"
}
}
它的响应代码也是400,所以看起来很明显为什么你得到它:
需要访问令牌。
我的代码中没有看到任何尝试提供此类访问令牌的内容。