微信小程式-登入流程
流程圖：
1、首先，客戶端呼叫wx.login，回撥資料了包含jscode，用於獲取openid（使用者唯一標識）和sessionkey（會話金鑰）。
2、拿到jscode後，將其傳送給服務端，服務端拿它與微信服務端做互動獲取openid和sessionkey。具體獲取方法如下：
（1）需要寫一個HttpUrlConnection工具類：
?| 1234567891011121314151617181920212223242526272829303132333435363738394041424344 | public class MyHttpUrlConnection { private final int mTimeout = 10000; // 超時時間 /** * get訪問 */public String[] requestJson(String url) { return request(url); } private String[] request(String connurl) { String[] resultStr = new String[]{"", ""}; StringBuilder resultData = new StringBuilder(""); HttpURLConnection conn = null; try { URL url = new URL(connurl); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setUseCaches(false); conn.setConnectTimeout(mTimeout); conn.connect(); int resultCode = conn.getResponseCode(); InputStreamReader in; if (resultCode == 200) { in = new InputStreamReader(conn.getInputStream()); BufferedReader buffer = new BufferedReader(in); String inputLine; while ((inputLine = buffer.readLine()) != null) { resultData.append(inputLine); resultData.append("\n"); } buffer.close(); in.close(); } resultStr[0] = resultData.toString(); resultStr[1] = resultCode + ""; } catch (Exception e) { e.printStackTrace(); } finally { if (conn != null) { conn.disconnect(); } } return resultStr; } } |
（2）然後通過這個工具類與微信伺服器建立連線，獲取想要的資料：
?| 1234567 | + jsCode + "&grant_type=authorization_code"; String res[] = connection.requestJson(url); System.out.println(res[0]); JSONObject object = JSON.parseObject(res[0]); String openId = object.getString("openid"
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