httpurlconnection简单例子
时间: 2023-04-28 12:02:30 浏览: 58
HttpURLConnection是Java中用于发送HTTP请求和接收HTTP响应的类。下面是一个简单的例子:
```java
import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class HttpURLConnectionExample {
public static void main(String[] args) {
try {
URL url = new URL("http://www.example.com");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
conn.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
这个例子中,我们使用HttpURLConnection发送一个GET请求到http://www.example.com,并设置请求头的Accept属性为application/json。如果响应码不是200,我们就抛出一个RuntimeException。然后我们读取响应体的内容,并输出到控制台。最后,我们关闭连接。