android java.net.ProtocolException：连接已建立

Question

public static Bitmap getImage(String address) throws Exception {

    Bitmap imgmap = null;
    InputStream is = null;

    URL url = new URL(address);

    HttpURLConnection  conn = (HttpURLConnection)url.openConnection();
    try {
        conn.setRequestMethod("GET"); >>> here was been excuted,but go to finally block
        conn.setConnectTimeout(5000); 
        is = conn.getInputStream();
        byte[] imgbytes = StreamTool.getBytes(is);
        imgmap = BitmapFactory.decodeByteArray(imgbytes, 0, imgbytes.length);

    } finally {
        if (is != null) {
            is.close();
        }
        if (conn != null) {
            conn.disconnect();
        }
    }

    return imgmap;
}

在conn.setRequestMethod("GET")受到谴责之前，请阻止已建立的异常连接。谁可以给我解决方案

Answer 1

那是因为setRequestMethod()必须在建立连接之前调用该函数。检查此链接

http://developer.android.com/reference/java/net/HttpURLConnection.html#setRequestMethod(java.lang.String）

因此最好在openConnection（）之前调用它。或者根本不称呼它。