Question

我正在尝试将mosh中的API用于项目，我已将其作为测试。

public static void main(String[] args){
     try {
         URL url = new URL("http://us.mc-api.net/v3/uuid/193nonaxishsl/csv/");
          BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
          String line;
          while ((line = in.readLine()) != null) {
                System.out.println(line);
                }
          in.close();  
                 }
                    catch (MalformedURLException e) {
                        e.printStackTrace();
                    }
                    catch (IOException e) {
                        e.printStackTrace();
                        System.out.println("I/O Error");

                    }
                }
}

这给了我一个IOException错误但是当我在网络浏览器中打开同一页面时我得到了

false,Unknown-Username

这是我想从代码中获得的。我是新人，并不知道为什么会这样或为什么。编辑：StackTrace

java.io.FileNotFoundException: http://us.mc-api.net/v3/uuid/193nonaxishsl/csv/
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at com.theman1928.Test.Main.main(Main.java:13)

Answer 1

URL返回状态代码404，因此输入流（此处温和猜测）未创建，因此为空。排序状态代码，你应该没问题。

使用此CSV进行操作，它很好：other csv

如果错误代码对您很重要，那么您可以使用HttpURLConnection：

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    System.out.println("code:"+conn.getResponseCode());

通过这种方式，您可以在继续快速if-then-else检查之前处理响应代码。

Answer 2

这与线程协议与java.net类和实际浏览器相比如何工作有关。浏览器将比您正在使用的简单java.net API复杂得多。

如果要在Java中获取等效响应值，则需要使用更丰富的HTTP API。

此代码将为您提供与浏览器相同的响应;但是，您需要下载Apache HttpComponents罐子

代码：

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.HttpClients;

public class TestDriver
{

public static void main(String[] args)
{
    try
    {
        String url = "http://us.mc-api.net/v3/uuid/193nonaxishsl/csv";

        HttpGet httpGet = new HttpGet(url);
        getResponseFromHTTPReq(httpGet, url);
    }
    catch (Throwable e)
    {
        e.printStackTrace();
    }
}

private static String getResponseFromHTTPReq(HttpUriRequest httpReq, String url)
{
    HttpClient httpclient = HttpClients.createDefault();

    // Execute and get the response.
    HttpResponse response = null;
    HttpEntity entity = null;
    try
    {
        response = httpclient.execute(httpReq);
        entity = response.getEntity();
    }
    catch (IOException ioe)
    {
        throw new RuntimeException(ioe);
    }

    if (entity == null)
    {
        String errMsg = "No response entity back from " + url;
        throw new RuntimeException(errMsg);
    }

    String returnRes = null;
    InputStream is = null;
    BufferedReader buf = null;
    try
    {
        is = entity.getContent();
        buf = new BufferedReader(new InputStreamReader(is, "UTF-8"));

        System.out.println("Response Code : " + response.getStatusLine().getStatusCode());

        StringBuilder sb = new StringBuilder();
        String s = null;
        while (true)
        {
            s = buf.readLine();
            if (s == null || s.length() == 0)
            {
                break;
            }
            sb.append(s);
        }

        returnRes = sb.toString();

        System.out.println("Response: [" + returnRes + "]");
    }
    catch (UnsupportedOperationException | IOException e)
    {
        throw new RuntimeException(e);
    }
    finally
    {
        if (buf != null)
        {
            try
            {
                buf.close();
            }
            catch (IOException e)
            {
            }
        }
        if (is != null)
        {
            try
            {
                is.close();
            }
            catch (IOException e)
            {
            }
        }
    }
    return returnRes;
}

}

<强>输出：

回复代码：404

回复：[false，Unknown-Username]

Answer 3

我尝试使用Apache HTTP库。 API端点似乎返回404的状态代码，因此您的错误。我使用的代码如下。

input = dataset[i]
emb_input = ?
self.llstm.forward(emb_input, reverse)

使用public static void main(String[] args) throws URISyntaxException, ClientProtocolException, IOException { HttpClient httpclient = HttpClients.createDefault(); URIBuilder builder = new URIBuilder("http://us.mc-api.net/v3/uuid/193nonaxishsl/csv/"); URI uri = builder.build(); HttpGet request = new HttpGet(uri); HttpResponse response = httpclient.execute(request); System.out.println(response.getStatusLine().getStatusCode()); // 404 }切换http://us.mc-api.net/v3/uuid/193nonaxishsl/csv/或者返回状态代码为200的任何内容，这进一步证明了API端点出错。您可以查看[Apache HTTP Components] library here。

在浏览器中工作的URL的FileNotFoundException

3 个答案: