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

*@paramurl 发送请求的URL

*@paramcookies 请求时携带的cookie

*@returnResult 所代表远程资源的响应,头信息

**/

public static Mapget(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 result = new HashMap();

BufferedReader in= null;try{//打开和URL之间的连接

URLConnection connection = newURL(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();

}

}returnresult;

}

/*** 根据返回码处理返回值

*@paramhttpURLConnection

*@paramin

*@paramresult

*@return*@throwsUnsupportedEncodingException

*@throwsIOException*/

public static Map getResponse(HttpURLConnection httpURLConnection, BufferedReader in, Mapresult)throwsUnsupportedEncodingException, 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> 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> Hearder =httpURLConnection.getHeaderFields();for(String key : Hearder.keySet()) {

result.put(key, Hearder.get(key).toString());

}

}returnresult;

}

/*** 获取请求的cookie

*@returnString

*@paramurl:请求的url

* 创建时间:2017-03-04,最后更新时间:2017-03-04*/

public staticString 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= newURL(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> maps =httpURLConnection.getHeaderFields();

List coolist =maps.get(cookieskey);

Iterator it =coolist.iterator();

StringBuffer sbu= newStringBuffer();//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();

}

}returnCookieStr;

}