Android studio利用httpurlconnection发送请求

在 Android Studio 中，可以使用 HttpUrlConnection 类来发送网络请求。下面是一个简单的示例代码，演示如何使用 HttpUrlConnection 发送 GET 请求：

public class HttpUrlConnectionExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://example.com/api/data");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.connect();
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = conn.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                String line;
                StringBuilder result = new StringBuilder();
                while ((line = bufferedReader.readLine()) != null) {
                    result.append(line);
                }
                bufferedReader.close();
                inputStream.close();
                String responseData = result.toString();
                // 解析响应数据
                System.out.println(responseData);
            }
            conn.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

其中，URL 表示请求地址，HttpURLConnection 类可以使用 openConnection() 方法打开连接，设置请求方法为 GET，并调用 connect() 方法建立连接。如果响应状态码为 HTTP_OK，则读取响应数据并进行解析。

发送 POST 请求时，需要设置请求方法为 POST，并设置请求数据。示例如下：

public class HttpUrlConnectionExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://example.com/api/data");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            OutputStream outputStream = conn.getOutputStream();
            String requestData = "key1=value1&key2=value2";
            outputStream.write(requestData.getBytes());
            outputStream.close();
            conn.connect();
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = conn.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                String line;
                StringBuilder result = new StringBuilder();
                while ((line = bufferedReader.readLine()) != null) {
                    result.append(line);
                }
                bufferedReader.close();
                inputStream.close();
                String responseData = result.toString();
                // 解析响应数据
                System.out.println(responseData);
            }
            conn.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

其中，setDoOutput(true) 表示请求数据可以写入请求体，setDoInput(true) 表示响应数据可以读取。将请求数据写入 OutputStream，并调用 connect() 方法建立连接。