java调用http接口
时间: 2023-10-16 14:10:26 浏览: 47
Java 可以通过 HttpURLConnection 或 HttpClient 调用 http 接口。
使用 HttpURLConnection 调用 http 接口的示例代码:
```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://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();
}
}
}
```
使用 HttpClient 调用 http 接口的示例代码:
```java
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class HttpClientExample {
public static void main(String[] args) {
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet("http://example.com");
HttpResponse response = client.execute(request);
String responseBody = EntityUtils.toString(response.getEntity());
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
需要注意的是,HttpClient 在 Java 11 中已经被标记为过时,建议使用 HttpURLConnection 或其他第三方库。