爬虫基础之URI访问网站获取HTML

GET方式

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class JDKGet {

    public static void main(String[] args) throws Exception {
        //1.创建URL对象
        URL url = new URL("http://www.bingosoft.net");

        //2. 获取连接
        HttpURLConnection httpURLConnection =(HttpURLConnection) url.openConnection();

        //3. 封装参数
        //3.1 指定请求的方式
        // 注意: 参数的值一定要大写
        httpURLConnection.setRequestMethod("GET");

        //4. 获取数据的操作(获取响应体)
        InputStream in = httpURLConnection.getInputStream();

        //5. 获取内容
        int len = -1;
        byte[] b = new byte[1024];

        while((len = in.read(b))!=-1){

            System.out.println(new String(b,0,len));
        }
    }
}

POST方式

public class JDKPost {

    public static void main(String[] args) throws IOException {
        //1.设置连接
        URL url = new URL("http://www.bingosoft.net");
        //2.打开连接
        HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
        //3.设置请求参数
        urlConnection.setRequestMethod("POST");
        urlConnection.setDoOutput(true);
        //3.1封装请求参数
        OutputStream outputStream = urlConnection.getOutputStream();
        outputStream.write("username=zs&password=123".getBytes());
        //4.获取数据
        BufferedReader br = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
        String len = null;
        while ((len = br.readLine()) != null){
            System.out.println(len);
        }
        //5.关闭资源
        br.close();
        outputStream.close();
    }
}