模擬登陸豆瓣

<font color="Gray">模擬登陸豆瓣</font>

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>工具：java httpclient F12

>在閱讀前請先學習http相關內容，主要是首部，報文內容，cookie

1. 調試獲得登陸網頁時須要的cookie

>使用ie打開登陸豆瓣的[網址]( https://www.douban.com/accounts/login)

用開發人員工具（F12)查看網絡，從新刷新網頁，獲得請求數據以下

2. 登陸賬號密碼 查看F12中數據，並找請求的過程

請求中所需的cookie

請求正文

這是就是登陸是所需提交的東西，其中賬號密碼是本身的，captcha是驗證碼，須要下載以及填入，也可也用opencv解決，對其他不知道的東西就要用搜索，好比發送的cookie中包含一個bid，可是bid是什麼不知道，就要搜索bid的值

搜索獲得第一次請求.douban.com這個域名時服務器返回的cookie中會包含bid

能夠使用和httpclient 模擬訪問一次douban.com，獲得返回頭部中Set-Cookie中的bid值

對於驗證碼，我訪問時請求獲得的驗證碼時sound，找到這條請求

請求的方法時get，須要包含id參數，搜索id，獲得是請求時一次response的正文內容

模擬此次請求，獲得 value

以上獲得登陸所需的cookie以及表單，能夠實現登陸

>以上是獲得的過程，代碼是與過程相反的，要先訪問網址獲得bid 和 驗證碼的網址 獲得以後在登陸。如下代碼是測試用，沒有優化，沒有註釋，僅供參考，httpclient會自動保存cookie，因此驗證以後用同一client訪問會是登陸狀態（保存了cookie），代碼中有不少冗餘代碼，自行處理。僅供參考，最後打印出的是登陸後的用戶主頁。

```java

CloseableHttpClient client = HttpClients.custom()

.setRedirectStrategy(new LaxRedirectStrategy())

.build();

HttpGet get = new HttpGet("https://accounts.douban.com/login?source=book");

get.setHeader("Host","accounts.douban.com");

get.setHeader("Connection","Keep-Alive");

get.setHeader("Referer","https://book.douban.com");

CloseableHttpResponse response = client.execute(get);

HttpEntity entity = response.getEntity();

entity = new BufferedHttpEntity(entity);

String value = EntityUtils.toString(entity);

value = value.split("input type=\"hidden\" name=\"captcha-id\" value=\"")[1].split("\"/>")[0];

System.out.println(value);

Header[] header = response.getHeaders("Set-Cookie");

System.out.println(header[1].getValue().split(";")[0]);

String cookie = header[1].getValue().split(";")[0];

get = new HttpGet("https://www.douban.com/misc/captcha?id="+value+"&size=s");

get.setHeader("Cookie",cookie);

response = client.execute(get);

entity = response.getEntity();

String path ="D:\\yam.png";

File file = new File(path);

if(file.exists())

file.delete();

InputStream in = entity.getContent();

try {

FileOutputStream fout = new FileOutputStream(path);

int len = -1;

byte[] tmp = new byte[1024];

while ((len = in.read(tmp))!=-1)

fout.write(tmp);

fout.close();

}finally{

in.close();

}

get.releaseConnection();

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

String yzm = reader.readLine();

HttpPost post = new HttpPost("https://accounts.douban.com/login");

post.setHeader("Cookie", cookie + ";ps=y");

List<NameValuePair> nvps = new ArrayList<NameValuePair>();

nvps.add(new BasicNameValuePair("source","book"));

nvps.add(new BasicNameValuePair("form_email","賬號"));

nvps.add(new BasicNameValuePair("form_password","密碼"));

nvps.add(new BasicNameValuePair("captcha-solution",yzm));

nvps.add(new BasicNameValuePair("captcha-id",value));

nvps.add(new BasicNameValuePair("login","登陸"));

UrlEncodedFormEntity encodedFormEntity = new UrlEncodedFormEntity(nvps);

post.setEntity(encodedFormEntity);

BufferedReader bufferedInputStream = new BufferedReader(new InputStreamReader(encodedFormEntity.getContent()));

String line = "";

while ((line = bufferedInputStream.readLine())!=null)

System.out.println(line);

response = client.execute(post);

entity = response.getEntity();

Header[]  headers = response.getHeaders("Set-Cookie");

for (Header header1 : headers) {

System.out.println(header1.getValue());

}

get = new HttpGet("https://www.douban.com/people/m9zjl/");

System.out.println(EntityUtils.toString(entity));

```

來自爲知筆記(Wiz)