Java网络编程：HTTP请求响应的理解与代码实现

原创今天药忘吃喽~ 2024-12-05 09:15 19阅读 0赞

在Java中，进行HTTP请求和响应主要通过Java的Socket编程或者使用第三方库如Apache HttpClient或者OkHttp等。

以下是一个简单的Socket编程，发送GET请求的例子：

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

public class HttpRequest {
    public static void main(String[] args) {
        String urlStr = "http://example.com"; // Replace with your target URL

try {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

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

// Check if connection is successful
            int responseCode = conn.getResponseCode();
            if (responseCode == 200) { // Success, read response
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()))); 
                String inputLine;
                StringBuffer response = new StringBuffer();

while ((inputLine = br.readLine()) != null) {
                    response.append(inputLine);
                }

System.out.println(response.toString()); // Print the response
            } else {
                System.out.println("Failed to connect. Response Code: " + responseCode); // Failed connection, print error code
            }
        } catch (Exception e) {
            System.err.println("Error occurred while executing HTTP request.");
            e.printStackTrace();
        }
    }
}
```

以上代码是一个基本的HTTP GET请求，如果需要处理POST、PUT等其他请求方式，或者使用第三方库进行高级网络编程，那么代码会更复杂。