模拟登陆豆瓣

<font color="Gray">模拟登陆豆瓣</font>

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>工具：java httpclient F12

>在阅读前请先学习http相关内容，主要是首部，报文内容，cookie

1. 调试获得登陆网页时须要的cookie

>使用ie打开登陆豆瓣的[网址]( https://www.douban.com/accounts/login)

用开发人员工具（F12)查看网络，从新刷新网页，获得请求数据以下

2. 登陆账号密码 查看F12中数据，并找请求的过程

请求中所需的cookie

请求正文

这是就是登陆是所需提交的东西，其中账号密码是本身的，captcha是验证码，须要下载以及填入，也可也用opencv解决，对其他不知道的东西就要用搜索，好比发送的cookie中包含一个bid，可是bid是什么不知道，就要搜索bid的值

搜索获得第一次请求.douban.com这个域名时服务器返回的cookie中会包含bid

能够使用和httpclient 模拟访问一次douban.com，获得返回头部中Set-Cookie中的bid值

对于验证码，我访问时请求获得的验证码时sound，找到这条请求

请求的方法时get，须要包含id参数，搜索id，获得是请求时一次response的正文内容

模拟此次请求，获得 value

以上获得登陆所需的cookie以及表单，能够实现登陆

>以上是获得的过程，代码是与过程相反的，要先访问网址获得bid 和 验证码的网址 获得以后在登陆。如下代码是测试用，没有优化，没有注释，仅供参考，httpclient会自动保存cookie，因此验证以后用同一client访问会是登陆状态（保存了cookie），代码中有不少冗余代码，自行处理。仅供参考，最后打印出的是登陆后的用户主页。

```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","账号"));

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

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

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

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

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));

```

来自为知笔记(Wiz)