API调用实践：Java SDK中常见API的使用示例

原创 ╰+攻爆jí腚メ 2024-11-15 15:00 30阅读 0赞

在Java SDK中，许多API用于与服务端交互。这里以常见的RESTful API调用为例进行解释：

1. **Google Maps API** (例如 Geocoding)

```java
import com.google.maps.*;
// 创建地图对象
Map map = new Map(new Camera(40.7128, -74.0060, 35))));

// 调用Geocoding API
GeocodingResponse response = GeocodingApi.geocode(map, "New York, NY"));

if (response.results.length > 0) {
    Location location = response.results[0].location;
    System.out.println("Latitude: " + location.lat());
    System.out.println("Longitude: " + location.lng());
}
```

2. **GitHub API** (例如获取用户信息)

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class GitHubAPIClient {
    public static void main(String[] args) {
        String username = "octocat"; // Your GitHub Username

getUserInfo(username);
    }

private static void getUserInfo(String username) {
        try {
            URL url = new URL("https://api.github.com/users/" + username);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("GET");
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code: " + responseCode);

if (responseCode == 200) {
                BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))));
                String line;
                StringBuilder content = new StringBuilder();

while ((line = br.readLine()) != null) {
                    content.append(line).append("\n");
                }

System.out.println("User Information:\n" + content.toString());
            }
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
        }
    }
}
```

3. **Amazon API** (例如获取商品信息)

```java
import com.amazonaws.services AmazonWebServiceClient;
import com.amazonaws.regions.Region;
import com.amazonaws.services.ec2.AmazonEC2Client;

public class AmazonAPIExample {
    public static void main(String[] args) {
        // 根据需要选择AWS服务区域
        Region region = Region.US_EAST_1; 
        AmazonWebServiceClient client = new AmazonEC2Client(clientConfiguration, region));

String instanceId = "i-0123456789"; // Your EC2 Instance ID

try {
            DescribeInstancesResult result = client.describeInstances(newDescribeInstancesRequest(instanceId))));
            
            if (result.getReservations().size() > 0) {
                Reservation reservation = result.getReservations().get(0);
                
                for (Instance instance : reservation.getInstances()) {
                    System.out.println("Instance ID: " + instance.getInstanceId());
                    System.out.println("Instance State: " + instance.getState().getName());
                    // 根据需求添加更多实例信息
                }
            } else {
                System.out.println("No instances found with the given ID.");
            }
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
        }
    }
}
```

这些示例展示了如何在Java中使用各种API服务。实际使用时，需要根据特定的API文档进行设置。