httpurlconnection发送get请求获取请求头
时间: 2023-11-25 12:37:02 浏览: 27
您可以使用以下代码示例来发送GET请求并获取响应头:
```
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpURLConnectionExample {
public static void main(String[] args) {
try {
URL url = new URL("http://example.com");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("User-Agent", "Mozilla/5.0");
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
// 获取响应头
String contentType = conn.getHeaderField("Content-Type");
int contentLength = conn.getHeaderFieldInt("Content-Length", -1);
System.out.println("Content-Type = " + contentType);
System.out.println("Content-Length = " + contentLength);
in.close();
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
}
}
}
```
在上面的示例中,我们首先创建一个URL对象,并使用它创建一个HttpURLConnection对象。然后,我们设置请求方法为GET并添加User-Agent请求头。接下来,我们使用BufferedReader从输入流中读取响应内容,并输出到控制台。最后,我们使用`getHeaderField()`和`getHeaderFieldInt()`方法获取响应头信息,并输出到控制台。