getInputStream（）上的java.io.FileNotFoundException [英] java.io.FileNotFoundException on getInputStream()

问题描述

我正在尝试从URL获取getInputStream，连接响应代码是 200 ，但是我得到一个异常 FileNotFoundException 当我尝试getInputStream时，这是我的代码：

I am trying to getInputStream from a URL, the connection response code is 200, but I am getting an exception FileNotFoundException when I try to getInputStream, here is my code:

url = new URL("http://...");
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestMethod("POST");
int status = connection.getResponseCode();
if(status >= 400){
    request = new OutputStreamWriter(connection.getOutputStream());
    request.write(params);
    request.flush();
    request.close();
    String line;
    InputStreamReader isr = new InputStreamReader(connection.getInputStream());
    BufferedReader reader = new BufferedReader(isr);
    StringBuilder sb = new StringBuilder();
    while ((line = reader.readLine()) != null) {
        sb.append(line + "\n");
    }
}

堆栈跟踪：

W/System.err: java.io.FileNotFoundException: http://...
W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:238)
W/System.err:     at com.apps.topinformers.sharedreading.AddGroupMembersFragment.postText(AddGroupMembersFragment.java:112)
W/System.err:     at com.apps.topinformers.sharedreading.AddGroupMembersFragment.access$000(AddGroupMembersFragment.java:26)
W/System.err:     at com.apps.topinformers.sharedreading.AddGroupMembersFragment$PostDataAsyncTask.doInBackground(AddGroupMembersFragment.java:65)
W/System.err:     at com.apps.topinformers.sharedreading.AddGroupMembersFragment$PostDataAsyncTask.doInBackground(AddGroupMembersFragment.java:55)
W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
W/System.err:     at java.lang.Thread.run(Thread.java:818)

有什么问题，以及如何调试它？

What is the problem, and how I can debug it?

推荐答案

连接响应代码为200

The connection response code is 200

不，不是。此代码中没有任何内容可以检查响应代码。 FileNotFoundException 表示响应代码为404.

No it isn't. There is nothing in this code that checks the response code. A FileNotFoundException means a response code of 404.

NB setDoOutput（true）将方法设置为POST。您不需要自己设置，

NB setDoOutput(true) sets the method to POST. You don't need to set that yourself,

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