android java.net.ProtocolException：已建立连接 [英] android java.net.ProtocolException: Connection already established

问题描述

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;
}

在之前conn.setRequestMethod（GET）被执行，Thorw异常Connection已经建立。谁可以给我一个解决方案

before conn.setRequestMethod("GET") was excuted,thorws the exception Connection already established. who can give me a solution

推荐答案

那是因为函数 setRequestMethod（）必须在建立连接之前调用。
查看此链接

Thats because the function setRequestMethod() has to be called before the connection is made. Check this link

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

所以最好在openConnection（）之前调用它。或者根本不打电话。

So better call it before openConnection(). Or dont call it at all.

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