java http token请求代码实例请求代码实例

在Java中发送HTTP请求携带JWT（JSON Web Token）通常会涉及到使用像`HttpURLConnection`, `OkHttpClient`或者第三方库如`Apache HttpClient`或`Spring WebClient`。这里是一个简单的例子，使用`java.net.HttpURLConnection`发送GET请求：

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class JwtAuthExample {
    private static final String ALGORITHM = "HS256";
    private static final String SECRET_KEY = "your_secret_key"; // 替换为你的密钥

    public static void main(String[] args) throws Exception {
        String jwt = generateJwt("username", "password"); // 生成JWT

        String url = "https://api.example.com/protected-resource"; // API URL
        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();

        // 设置请求头，包含Authorization字段
        connection.setRequestProperty("Authorization", "Bearer " + jwt);
        connection.setRequestMethod(HttpMethod.GET.name());

        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            System.out.println("Success! Response code: " + responseCode);
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuilder content = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
                content.append(inputLine);
            }
            in.close();
            System.out.println("Response Content: " + content.toString());
        } else {
            System.out.println("Error: " + responseCode);
        }
    }

    private static String generateJwt(String username, String password) {
        try {
            SecretKeySpec secretKey = new SecretKeySpec(SECRET_KEY.getBytes(StandardCharsets.UTF_8), ALGORITHM);
            Mac mac = Mac.getInstance(ALGORITHM);
            mac.init(secretKey);

            byte[] encodedData = Base64.getEncoder().encode((username + ":" + password).getBytes(StandardCharsets.UTF_8));
            byte[] hash = mac.doFinal(encodedData);
            return Base64.getEncoder().encodeToString(hash);
        } catch (Exception e) {
            throw new RuntimeException("Failed to generate JWT", e);
        }
    }
}