java 爬取12306

要在Java中爬取12306网站，你可以使用HttpClient或Jsoup等库来发送HTTP请求并解析响应内容。下面是一个简单的示例代码：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class Main {
    public static void main(String[] args) {
        String url = "https://www.12306.cn/";

        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet httpGet = new HttpGet(url);

        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            String content = EntityUtils.toString(entity);
            System.out.println(content);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请注意，访问12306网站可能需要设置一些请求头或使用验证码识别等技术，具体要根据网站的要求进行处理。此外，爬取网站数据时要遵守相关法律法规和网站的使用条款。