URLConnection错误 - java.io.IOException：服务器返回HTTP响应代码：URL为400 [英] URLConnection Error - java.io.IOException: Server returned HTTP response code: 400 for URL

问题描述

我正在尝试连接到桌面应用程序的URL，我收到了问题标题中指出的错误，但是当我尝试从servlet连接到同一个URL时，一切正常。当我从浏览器加载URL时，一切正常。我在servlet中使用相同的代码。代码在库中，当它不起作用时，我将代码拉出到当前项目中的一个类，但它没有用。

I am trying to connect to a URL from a desktop app, and I get the error indicated in the Title of my question, but when I tried to connect to the same URL from servlet, all works fine. When I load the URL from browser, all works fine. I am using the same code in the servlet. The code was in a library, when it didn't work, I pulled the code out to a class in the current project, yet it didn't work.

网址 https://graph.facebook.com/me 。

代码片段。

public static String post(String urlSpec, String data) throws Exception {
    URL url = new URL(urlSpec);
    URLConnection connection = url.openConnection();
    connection.setDoOutput(true);
    OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
    writer.write(data);
    writer.flush();

    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String line = "";
    StringBuilder builder = new StringBuilder();
    while((line = reader.readLine()) != null) {
        builder.append(line);
    }
    return builder.toString();
}   

我在这里有点困惑，有什么东西存在一个不是普通桌面应用程序的servlet？

I'm a little bit confused here, is there something that is present is a servlet that is not a normal desktop app?

谢谢。

完全堆栈跟踪

Feb 8, 2011 9:54:14 AM com.trinisoftinc.jiraffe.objects.FacebookAlbum create
SEVERE: null
java.io.IOException: Server returned HTTP response code: 400 for URL: https://graph.facebook.com/me
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1313)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:234)
        at com.jiraffe.helpers.Util.post(Util.java:49)
        at com.trinisoftinc.jiraffe.objects.FacebookAlbum.create(FacebookAlbum.java:211)
        at com.trinisoftinc.jiraffe.objects.FacebookAlbum.main(FacebookAlbum.java:261)

推荐答案

我终于找到了问题。当然这是我的代码。我没有发布的代码的一部分是数据的价值。数据必须只包含名称和描述，但我传递的不仅仅是名称和描述。

I finally found the problem. Of course it's my code. One part of the code I didn't post is the value of data. data must contain only name and description but I am passing more than name and description.

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