HttpURLConnection:java.lang.IllegalStateException:已连接 [英] HttpURLConnection: java.lang.IllegalStateException: Already connected

问题描述

我正在尝试使用HttpURLClient使用下面显示的HttpRestClient类将一些POST数据发送到服务器.执行时

I'm trying to use HttpURLClient to send some POST data to a server using the HttpRestClient class shown below. When executing

conn.setDoInput(true);

我知道

java.lang.IllegalStateException: Already connected

我卸载了该应用程序，仍然出现相同的错误.

I uninstalled the app, and still get the same error.

在所有示例中，我都看到openConnection在setDoInput之前被调用.如果顾名思义，openConnection打开一个连接，则永远不要在setDoInput之前使用它，对吗?我想念什么?

In all the example I've seen openConnection is called before setDoInput. If, as its name suggests, openConnection opens a connection, it should never be used before `setDoInput, right? What am I missing?

也许在执行disconnect之前它崩溃了.那可能是原因吗?如果是这样，如何断开旧连接?

Maybe at some point it crashed before executing disconnect. Could that be the reason? If so, how can I disconnect the old connection?

public class HttpRestClient {
static public int post(String urlStr, List<NameValuePair> data){

    HttpURLConnection conn = null;

    try {

        URL url = new URL(urlStr);


        conn = (HttpURLConnection) url.openConnection();

        conn.setDoInput(true);
        conn.setDoOutput(true);

        conn.setRequestMethod("POST");

        OutputStream os = conn.getOutputStream();
        BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(os, "UTF-8"));
        writer.write(getQuery(data));
        writer.flush();
        writer.close();
        os.close();

        InputStream is = conn.getInputStream();

        String dude = readIt(is);

        return 1;

    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return 0;
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return 0;
    }
    finally {
        if(conn!=null) conn.disconnect();
    }
}
}

推荐答案

这可能是由于在IDE中进行调试时需要监视.请参阅此答案. 它发生在我身上，很难发现.

This might be due to watches while debugging in your IDE. See this answer. It happened to me and was hard to discover.

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