HttpURLConnection 请求实例

package app.works;

import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**

• 获取token类
  */

public class AiToken {
/**
* 获取权限token
* @return 返回示例：
* {
* “access_token”: “24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567”,
* “expires_in”: 2592000
* }
*/

public static void main(String[] args) {
    String auth = getAuth();
    System.out.println(auth);
}
public static String getAuth() {
    // 官网获取的 API Key 更新为你注册的
    String clientId = "heO94Px2341AyEhOn0lFFE0jTa2L";
    // 官网获取的 Secret Key 更新为你注册的
    String clientSecret = "AfNPCBR7Lf522afaVIBaM2eHboPa3QIRkSCm8y ";
    return getAuth(clientId, clientSecret);
}

/**
 * 获取API访问token
 * 该token有一定的有效期，需要自行管理，当失效时需重新获取.
 * @param ak - 百度云官网获取的 API Key
 * @param sk - 百度云官网获取的 Securet Key
 * @return assess_token 示例：
 * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"
 */
public static String getAuth(String ak, String sk) {
    // 获取token地址
    String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
    String getAccessTokenUrl = authHost
            // 1. grant_type为固定参数
            + "grant_type=client_credentials"
            // 2. 官网获取的 API Key
            + "&client_id=" + ak
            // 3. 官网获取的 Secret Key
            + "&client_secret=" + sk;
    try {
        URL realUrl = new URL(getAccessTokenUrl);
        // 打开和URL之间的连接
        HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
        connection.setRequestMethod("GET");
        connection.connect();
        // 获取所有响应头字段
        Map<String, List<String>> map = connection.getHeaderFields();
        // 遍历所有的响应头字段
        for (String key : map.keySet()) {
            System.err.println(key + "--->" + map.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应
        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String result = "";
        String line;
        while ((line = in.readLine()) != null) {
            result += line;
        }
        /**
         * 返回结果示例
         */
        System.err.println("result:" + result);
        JSONObject jsonObject = new JSONObject(result);
        String access_token = jsonObject.getString("access_token");
        return access_token;
    } catch (Exception e) {
        System.err.printf("获取token失败！");
        e.printStackTrace(System.err);
    }
    return null;
}

}

转载于:https://www.cnblogs.com/znsongshu/p/10177301.html