android java.net.ProtocolException：已建立连接

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

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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