关于Java网络编程：HTTP请求问题实例

原创分手后的思念是犯贱 2024-11-27 18:24 12阅读 0赞

在Java网络编程中，处理HTTP请求通常会涉及Apache HttpClient或者Java自带的URL连接库。以下是一个简单的实例，展示如何通过Java发送一个GET HTTP请求：

```java
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class HttpGetExample {
    public static void main(String[] args) throws Exception {
        // 创建HttpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();

// 创建HttpGet请求
        HttpGet httpGet = new HttpGet("http://example.com/api/data");

try (CloseableHttpResponse response = httpClient.execute(httpGet)) {
            // 检查响应状态码
            if (response.getStatusLine().getStatusCode() == 200) {
                // 获取响应体，这里使用StringEntity
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    System.out.println("Response Body: " + new String(entity.getContent()));
                }
            } else {
                System.err.println("Failed to fetch data. Status Code: " + response.getStatusLine().getStatusCode());
            }
        } finally {
            // 关闭HttpClient实例，释放资源
            httpClient.close();
        }
    }
}
```

这个示例中，我们创建了一个`HttpGet`对象，并指定URL为"http://example.com/api/data"。然后通过`CloseableHttpClient`发送请求，获取并打印响应体内容。