发送HTTP请求返回301和从HttpResponse中获取Cookie解决方案

1、发送HTTP请求，如何从HttpResponse中获取Cookie?

2、发送HTTP请求返回301重定向响应吗，如何发起二次post请求，获得最终的响应？

解决方案如下：

private static String getCookieFromResponse(@NonNull HttpResponse response) {
        Header[] responseHeader = response.getHeaders("Set-Cookie");
        int length = responseHeader.length;
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (responseHeader[i] != null) {
                if ("Set-Cookie".equals(responseHeader[i].getName())) {
                    int index = responseHeader[i].getValue().indexOf(";");
                    if (i == length - 1) {
                        stringBuilder.append(responseHeader[i].getValue().substring(0, index));
                    } else {
                        stringBuilder.append(responseHeader[i].getValue().substring(0, index) + "; ");
                    }
                }
            }
        }
        return stringBuilder.toString();
    }

    @SuppressWarnings("deprecation")
    private static HttpResponse doPost(String url, List<NameValuePair> list, String charset, boolean isSetCookie, String cookieValue) throws Exception {
        HttpClient httpClient = SSLClient.getSingletonHttpClient();
        HttpPost httpPost = new HttpPost(url);
        if (isSetCookie) {
            httpPost.addHeader("Cookie", cookieValue);
        }
        httpPost.setEntity(new UrlEncodedFormEntity(list, charset));
        HttpResponse response = httpClient.execute(httpPost);
        if (response != null) {
            if (response.getStatusLine().getStatusCode() == org.apache.http.HttpStatus.SC_MOVED_PERMANENTLY) {
                return doPost(response.getFirstHeader("location").getValue(), list, charset, true, getCookieFromResponse(response));
            } else if (response.getStatusLine().getStatusCode() == org.apache.http.HttpStatus.SC_OK) {
                return response;
            }
        }
        return response;
    }

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