Java访问重定向接口

背景：开发做了一个免登陆的接口，方便我后续给管理后台做一些小工具，问题来了，给的免登陆接口是个302如图的test_login，在重定向一个200的接口（eload_admin），

原本开始这样做：02这个免登陆接口时，获取登录的cookies，在把登录后的cookies给200的接口，就是正常登录成功

如图：登录成功后获200页面显示的内容session就表示获取了登录态

问题：但是在代码中实施遇到一个问题，获取到的coookie在放到下一个接口不行，弄了好久，之后误打误撞发现，在我访问302的这个接口时，应该先get，在重新get获取cookie，就是需要做两次get,代码如下

public static void main(String[] args) throws ScriptException {

　　　　System.out.println("重定向接口:"+htppResopnes.get("http://rosegal.com.trunk.s1.egomsl.com/datafeed/test_login.php?tts=a05b3726d9ba6a6947734e4ef0504ffb"));//请求一次url
　　　　String getcookie=htppResopnes.getCookie("http://rosegal.com.trunk.s1.egomsl.com/datafeed/test_login.php?tts=a05b3726d9ba6a6947734e4ef0504ffb");//在请求获取cookie
　　　　String getseesion=until.getMapValue(getcookie, "RG_SESSIONID");//获取seesion
　　　　//判断是否登录
　　　　System.out.println("登录成功："+htppResopnes.get("http://rosegal.com.trunk.s1.egomsl.com/eload_admin/",getseesion))；

}

htppResopnes的方法：

需要注意的是，因为我在请求两个接口的时候用到一个getcookie，和一个get,这里就需要保证他们的头部cookie是需要一致的，这里因为当时设置不一致，导致访问也是失败的

    /**
     * 向指定URL发送GET方法的请求,并携带指定cookie
     * @param url 发送请求的URL
     * @param cookies 请求时携带的cookie
     * @return Result 所代表远程资源的响应,头信息
     *
     */
    public static Map<String, String> get(String url,String cookies) {
        Cookie staging = null;
        //Cookie ORIGINDC = null;
        int defaultConnectTimeOut = 50000; // 默认连接超时,毫秒
        int defaultReadTimeOut = 50000; // 默认读取超时,毫秒

        Map<String, String> result = new HashMap<String, String>();
        BufferedReader in = null;

        try {
            // 打开和URL之间的连接
            URLConnection connection = new URL(url).openConnection();
            // 此处的URLConnection对象实际上是根据URL的请求协议(此处是http)生成的URLConnection类的子类HttpURLConnection
            // 故此处最好将其转化为HttpURLConnection类型的对象,以便用到HttpURLConnection更多的API.
            HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
            //httpURLConnection.setInstanceFollowRedirects(false);
            // 设置通用的请求属性
            httpURLConnection.setRequestProperty("accept", "*/*");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
            httpURLConnection.setRequestProperty("Cookie","LPVID=NiNTJlMDdhOWIxMTM0N2Zm; cookieid=10023149924547802009973797079868836; scarab.visitor=%2231990FE0AA92EF1D%22; cookie_lang=en; bizhong=USD; first_access=yes; rosegal_us=visit; rosegal_caen=visit; _ga=GA1.2.2047632407.1495188930; RG_SESSIONID="+cookies);
            httpURLConnection.setConnectTimeout(defaultConnectTimeOut);
            httpURLConnection.setReadTimeout(defaultReadTimeOut);
            // 建立连接
            httpURLConnection.connect();

            result = getResponse(httpURLConnection, in, result);

        } catch (Exception requestException) {
            System.err.println("发送GET请求出现异常!" + requestException);
        }
        // 关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception closeException) {
                closeException.printStackTrace();
            }
        }

        return result;
    }

/**
     * 根据返回码处理返回值
     * @param httpURLConnection
     * @param in
     * @param result
     * @return
     * @throws UnsupportedEncodingException
     * @throws IOException
     */
    public static Map<String, String> getResponse(HttpURLConnection httpURLConnection, BufferedReader in, Map<String, String> result)
            throws UnsupportedEncodingException, IOException {
        int contentLengthAllow = -1; // 返回报文长度限制, 为-1时不限制长度

        boolean flag = false;
        for (int i = 0; i < successCode.length; i++) {
            if (successCode[i] == httpURLConnection.getResponseCode()) {
                flag = true;
                break;
            }
        }

        // 返回码非“successCode”时，response为返回message
        if (flag) {
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), "UTF-8"));
            String line;

            // 获取所有响应头字段
            Map<String, List<String>> Hearder = httpURLConnection.getHeaderFields();
            for (String key : Hearder.keySet()) {
                result.put(key, Hearder.get(key).toString());
            }

            String responseStr = "";
            while ((line = in.readLine()) != null) {
                responseStr += line;
            }

            // Content长度限制
            if (responseStr.length() > contentLengthAllow && contentLengthAllow > 0) {
                responseStr = responseStr.substring(0, contentLengthAllow);
            }

            result.put("Message", httpURLConnection.getResponseMessage());
            result.put("Code", String.valueOf(httpURLConnection.getResponseCode()));
            result.put("Response", responseStr);
        } else {
            result.put("Message", httpURLConnection.getResponseMessage());
            result.put("Code", String.valueOf(httpURLConnection.getResponseCode()));
            //
            result.put("Response", httpURLConnection.getResponseMessage());
            // 获取所有响应头字段
            Map<String, List<String>> Hearder = httpURLConnection.getHeaderFields();
            for (String key : Hearder.keySet()) {
                result.put(key, Hearder.get(key).toString());
            }
        }
        return result;
    }
    

/**
     * 获取请求的cookie
     * @return String
     * @param url:请求的url
     * 创建时间:2017-03-04,最后更新时间:2017-03-04
     */
    public static String getCookie(String url) {

        int defaultConnectTimeOut = 30000; // 默认连接超时,毫秒
        int defaultReadTimeOut = 30000; // 默认读取超时,毫秒
        String CookieStr = "";

        BufferedReader in = null;
        try {
            String cookieskey = "Set-Cookie";
            URLConnection connection = new URL(url).openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
            httpURLConnection.setInstanceFollowRedirects(false); 这个就是开启重定向

            httpURLConnection.setRequestProperty("accept", "*/*");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
            httpURLConnection.setRequestProperty("Cookie", "LPVID=NiNTJlMDdhOWIxMTM0N2Zm; cookieid=10023149924547802009973797079868836; scarab.visitor=%2231990FE0AA92EF1D%22; cookie_lang=en; bizhong=USD; first_access=yes; rosegal_us=visit; rosegal_caen=visit; _ga=GA1.2.2047632407.1495188930");
            httpURLConnection.setConnectTimeout(defaultConnectTimeOut);
            httpURLConnection.setReadTimeout(defaultReadTimeOut);
        /*    if (staging != null) {
                httpURLConnection.setRequestProperty("Cookie", staging.toString());
            }
            if (ORIGINDC != null) {
                httpURLConnection.setRequestProperty("Cookie", ORIGINDC.toString());
                ORIGINDC = null;
            }*/

            // 建立连接
            httpURLConnection.connect();

            // 从请求中获取cookie列表

            Map<String, List<String>> maps = httpURLConnection.getHeaderFields();
            List<String> coolist = maps.get(cookieskey);
            Iterator<String> it = coolist.iterator();
            StringBuffer sbu = new StringBuffer();
            // 拼接cookie再请求
            sbu.append("eos_style_cookie=default; ");
            while (it.hasNext()) {
                sbu.append(it.next() + ";");
            }
            CookieStr = sbu.toString();
            CookieStr = CookieStr.substring(0, CookieStr.length() - 1);
            System.out.println("**************CookieStr:" + CookieStr);
        } catch (Exception requestException) {
            System.err.println("发送GET请求出现异常!" + requestException);
        }
        // 关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception closeException) {
                closeException.printStackTrace();
            }
        }
        return CookieStr;
    }