Java HTTP客户端的创建与使用

原创冷不防 2025-03-10 02:15 30阅读 0赞

在Java中，我们可以使用HttpURLConnection或者HttpClient来创建和使用HTTP客户端。

1. 使用HttpURLConnection：

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.net.ssl.HttpsURLConnection;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        String url = "https://example.com"; // replace with your target URL

HttpsURLConnection connection = (HttpsURLConnection) new URL(url).openConnection();
        connection.setRequestMethod("GET");
        connection.connect();

BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())));

String inputLine;
        StringBuffer content = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
            content.append(inputLine);
        }

in.close();

// Now print the received content
        System.out.println(content.toString());
    }
}
```

2. 使用HttpClient：

如果你使用的是Apache HttpClient，你可以创建一个`CloseableHttpClient`对象然后使用`execute()`方法发送HTTP请求。

以下是一个示例：

```java
import org.apache.http.HttpResponse;
import org.apache.http.client.CloseableHttpClient;
import org.apache.http.client.methods.HttpGet;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String url = "https://example.com"; // replace with your target URL

HttpGet httpGet = new HttpGet(url);
        HttpResponse response = httpClient.execute(httpGet);

if (response.getStatusLine().getStatusCode() == 200) { // success
            System.out.println("Received content from server:");
            System.out.println(response.getEntity().toString());
        } else {
            System.out.println("Failed to fetch content from server.");
        }

httpClient.close();
    }
}
```

请根据你的实际需求选择合适的HTTP客户端工具。