// 示例：使用OAuth 2.0授权码流程获取访问令牌
const axios = require('axios');

async function getAccessToken() {
  const authCode = '从授权服务器获得的授权码';
  const clientId = '你的客户端ID';
  const clientSecret = '你的客户端密钥';
  const redirectUri = '你的重定向URI';
  const tokenUrl = '令牌端点URL';

  try {
    const response = await axios.post(tokenUrl, {
      grant_type: 'authorization_code',
      code: authCode,
      client_id: clientId,
      client_secret: clientSecret,
      redirect_uri: redirectUri
    });

    const { access_token, expires_in, refresh_token } = response.data;
    console.log('Access Token:', access_token);
    return access_token;
  } catch (error) {
    console.error('获取访问令牌失败:', error.response.data);
    throw error;
  }
}

# 示例：使用API密钥获取访问令牌
import requests

def get_access_token():
    api_key = "你的API密钥"
    token_url = "令牌端点URL"
    
    headers = {
        "Content-Type": "application/json",
        "Authorization": f"Bearer {api_key}"
    }
    
    response = requests.post(token_url, headers=headers)
    
    if response.status_code == 200:
        return response.json().get("access_token")
    else:
        raise Exception(f"获取令牌失败: {response.text}")

// 示例：使用JWT获取访问令牌
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.Date;

public class JwtTokenGenerator {
    private static final String SECRET_KEY = "你的密钥";
    private static final long EXPIRATION_TIME = 86400000; // 24小时
    
    public static String generateToken(String clientId) {
        return Jwts.builder()
                .setSubject(clientId)
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRATION_TIME))
                .signWith(SignatureAlgorithm.HS256, SECRET_KEY)
                .compact();
    }
}