如何通过Java进行HTTP请求和响应

原创短命女 2024-11-25 20:51 42阅读 0赞

在Java中，我们可以使用两个主要的库来进行HTTP请求和响应：`java.net.HttpURLConnection` 和 `java.util.concurrent Executors`。

以下是一个简单的示例，说明如何使用这些工具发送GET请求：

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

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        // URL to which you want to send the request
        String urlStr = "https://example.com/api/data";

// Create a URL object
        URL url = new URL(urlStr);

// Create an HttpURLConnection object
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

// Set the method to GET
        conn.setRequestMethod("GET");

// Check if request is successful (status code 200)
        int responseCode = conn.getResponseCode();
        if (responseCode == 200) { // Success
            System.out.println("Response received successfully!");
            
            // Read and print the response body
            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()))); 
            String responseLine;
            while ((responseLine = br.readLine()) != null) {
                System.out.println(responseLine);
            }
        } else {
            System.out.println("Request failed with status code: " + responseCode);
        }

// Close the connection
        conn.disconnect();
    }
}
```

这个示例展示了如何发送一个GET请求，获取响应，然后关闭连接。如果你需要处理POST、PUT或其他类型的HTTP请求，你可以调整`conn.setRequestMethod()`的方法。