在Java中调用REST接口通常使用HttpURLConnection或HttpClient来发送HTTP请求并接收响应。以下是一个简单的示例代码:
使用HttpURLConnection:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class RestClient {
public static void main(String[] args) {
try {
URL url = new URL("http://example.com/api/resource");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Content-Type", "application/json");
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
System.out.println(response.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}
使用HttpClient:
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 RestClient {
public static void main(String[] args) {
HttpClient httpClient = HttpClientBuilder.create().build();
HttpGet request = new HttpGet("http://example.com/api/resource");
request.addHeader("Content-Type", "application/json");
try {
HttpResponse response = httpClient.execute(request);
String responseBody = EntityUtils.toString(response.getEntity());
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
}
}
}
上述代码示例使用GET方法调用REST接口,并输出响应内容。根据实际情况,您可能需要修改HTTP方法、请求头或请求体等参数。