java 调用百度网盘开放api接口：通过httpclient获取access_token

时间：10-30来源：作者：点击数：34

1、百度网盘开放平台注册

* 登录开放平台官网
* 申请账号认证并接入
* 创建应用
* 获取Appid、ak、sk和Signkey

2、获取授权

官网描述

获取到登录二维码的一些信息，并将这个uuid保存记录。后面需要通过uuid和sign检查二维码是否扫描。

this.uuid = UUID.randomUUID().toString().toUpperCase();
String url2GetQr = "https://passport.baidu.com/v2/api/getqrcode?" + "lp=pc&qrloginfrom=pc&gid=" + this.uuid
				+ "&apiver=v3";

使用httpclient访问上一步的url，在得到的json数据中，得到真正的二维码地址，可以下载到本地或者其他使用方式。还需要将json数据中的sign的值取出，判断二维码是否扫描需要用到。

HttpGet get = new HttpGet(url2GetQr);
HttpResponse res = client.execute(get);
String content = EntityUtils.toString(res.getEntity(), "utf-8");
JSONObject json = JSONObject.parseObject(content);
this.imagUrl = json.getString("imgurl");
this.sign = json.getString("sign");

检查二维码是否扫描,error不为0就是还没有扫描的，status不为0就是扫了二维码还没点击。同时记录返回数据中的bduss值，后面获取code需要用到。

String url = "https://passport.baidu.com/channel/unicast?channel_id=" + this.sign + "&tpl=dev&gid=" + this.uuid
				+ "&callback=&apiver=v3";
HttpGet get = new HttpGet(url);
HttpResponse res = client.execute(get);
String content = EntityUtils.toString(res.getEntity(), "utf-8");
JSONObject json = JSONObject.parseObject(content);
int errno = json.getInteger("errno");
if (errno != 0) {
    System.out.println("还未扫码");
    return false;
}
json = JSONObject.parseObject(json.getString("channel_v"));
int status = json.getInteger("status");
if (status != 0) {
    System.out.println("二维码已扫描，点击确认即可");
    return true;
}
this.bduss = json.getString("v");

通过上面获取到的bduss值，获取code值，code的值10分钟内有效。同时将获取到的code值记录下来，后面用他获取tocken。

String url = "https://passport.baidu.com/v2/api/bdusslogin?tt=1620136625392" + "&bduss=" + bduss
				+ "&u=https%253A%252F%252Fopenapi.baidu.com%252Foauth%252F2.0%252Fauthorize%253Fresponse_type%253Dcode%2526client_id%253Dil7RmGmgWExN8uKm95OkjGyevzUWFOVZ%2526redirect_uri%253Doob%2526scope%253Dbasic%252Cnetdisk%2526display%253Dtv%2526qrcode%253D1"
				+ "&qrcode=1&tpl=dev&apiver=v3" + "&tt=1620136625392&traceid=&time=1620136625&alg=v3&"
				+ "sig=d1kwUzNMVGc4aGRXekhWd21BYmh4bmlibnY5VTF2SU9nL2lDUHg2OWpOWEtEalB6WEtwZEgvV1ZmL2M0dUJDeA%3D%3D"
				+ "&elapsed=34&shaOne=00a8413a841efcc76a027f832b86f0abf4b5f95a";
HttpGet get = new HttpGet(url);
HttpResponse res = client.execute(get);
String content = EntityUtils.toString(res.getEntity(), "utf-8");
Document html = Jsoup.parse(content);
this.code = html.getElementById("Verifier").attr("value");

利用自己在开放平台申请到的appid，secrekey等信息，和上一步获取到的code值获取tocken值

String url = "https://openapi.baidu.com/oauth/2.0/token?grant_type=authorization_code"
				+ "&code=" + this.code
				+ "&client_id=" + this.appKey
				+ "&client_secret=" + this.secretkey
				+ "&redirect_uri=" + this.redirectUri;
HttpGet get = new HttpGet(url);
HttpResponse res = client.execute(get);
String content = EntityUtils.toString(res.getEntity(), "utf-8");
JSONObject json = JSONObject.parseObject(content);
this.refreshToken = json.getString("refresh_token");
this.accessToken = json.getString("access_token");