java代码爬虫实现获取网页上登录后重定向的页面信息
时间: 2023-07-15 20:15:49 浏览: 59
实现步骤如下:
1. 发送登录请求并保存cookie
```java
String loginUrl = "https://example.com/login";
String username = "your_username";
String password = "your_password";
// 创建HttpClient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(loginUrl);
// 设置请求参数
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
// 发送请求并获取响应
CloseableHttpResponse response = httpClient.execute(httpPost);
// 保存cookie
String cookie = "";
Header[] headers = response.getHeaders("Set-Cookie");
for (Header header : headers) {
cookie += header.getValue().split(";")[0] + "; ";
}
```
2. 发送重定向请求并携带cookie
```java
String redirectUrl = "https://example.com/redirect";
// 创建HttpClient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(redirectUrl);
// 设置cookie
httpGet.setHeader("Cookie", cookie);
// 发送请求并获取响应
CloseableHttpResponse response = httpClient.execute(httpGet);
// 获取响应内容
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
```
其中,`cookie`是在登录请求中获取到的,并在重定向请求中携带给服务器,以保持用户登录状态。
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