1.根据wx.login获取code

2.根据code获取openid session_key  encryptedData  iv

3.根据session_key  encryptedData  iv  获取unionid

 

1.

wx.login({

success: res => {

// 发送 res.code 到后台换取 openId, sessionKey, unionId

var that = this;

var code = res.code;//登录凭证 code获取openid只能使用一次

}

})

 

wx.getUserInfo({

success: function (res) {

var encryptedData = res.encryptedData;

var iv = res.iv;

}

})

String params = "appid = appid&secret=secret&js_code=code&grant_type=authorization_code";

String sr = HttpRequest.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);

获取到session_key

String m = decrypt2(encryptedData, sessionKey, iv, "UTF-8");

{"openId":"","nickName":"李破","gender":1,"language":"zh_CN","city":"Wuhan","province":"Hubei","country":"China","avatarUrl":"https://wx.qlogo.cn/mmopen/vi_32/1iaXQDdbeiaLMRlTUoNLOVtkTVutT8zibTOakCia1zAfFibF1Re8jr6qj4Bu8d8T46V1GGnzJB0mdo4adLjL7BdI1vw/132","unionId":"","watermark":{"timestamp":1527841103,"appid":""}}

//相关方法

 

public static String decrypt2(String encryptedData, String sessionKey, String iv, String encodingFormat)        throws Exception {    // 被加密的数据    byte[] dataByte = Base64.decode(encryptedData);    // 加密秘钥    byte[] keyByte = Base64.decode(sessionKey);    // 偏移量    byte[] ivByte = Base64.decode(iv);    try {        // 如果密钥不足16位，那么就补足. 这个if 中的内容很重要        int base = 16;        if (keyByte.length % base != 0) {            int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);            byte[] temp = new byte[groups * base];            Arrays.fill(temp, (byte) 0);            System.arraycopy(keyByte, 0, temp, 0, keyByte.length);            keyByte = temp;        }        // 初始化        Security.addProvider(new BouncyCastleProvider());        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");        SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");        AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");        parameters.init(new IvParameterSpec(ivByte));        cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化        byte[] resultByte = cipher.doFinal(dataByte);        if (null != resultByte && resultByte.length > 0) {            String result = new String(resultByte, "UTF-8");            System.out.print(result);        }    }finally {        return null;    }}

 

//工具类

package com.yhhvip.utils.WxUtil;

import java.io.BufferedReader;

import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.URL; import java.net.URLConnection; import java.util.Map;

public class HttpUtil {

    //private static final Log logger = Logs.get();     private final static int CONNECT_TIMEOUT = 5000; // in milliseconds     private final static String DEFAULT_ENCODING = "UTF-8";

    public static String postData(String urlStr, String data){

        return postData(urlStr, data, null);     }

    public static String postData(String urlStr, String data, String contentType){

        BufferedReader reader = null;         try {             URL url = new URL(urlStr);             URLConnection conn = url.openConnection();             conn.setDoOutput(true);             conn.setConnectTimeout(CONNECT_TIMEOUT);             conn.setReadTimeout(CONNECT_TIMEOUT);             if(contentType != null)                 conn.setRequestProperty("content-type", contentType);             OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);             if(data == null)                 data = "";             writer.write(data);             writer.flush();             writer.close();

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));

            StringBuilder sb = new StringBuilder();             String line = null;             while ((line = reader.readLine()) != null) {                 sb.append(line);                 sb.append("\r\n");             }             return sb.toString();         } catch (IOException e) {             //logger.error("Error connecting to " + urlStr + ": " + e.getMessage());         } finally {             try {                 if (reader != null)                     reader.close();             } catch (IOException e) {             }         }         return null;     }     public static String SendGET(String url,String param){         String result="";//访问返回结果         BufferedReader read=null;//读取访问结果

        try {

            //创建url             URL realurl=new URL(url+"?"+param);             //打开连接             URLConnection connection=realurl.openConnection();             // 设置通用的请求属性             connection.setRequestProperty("accept", "*/*");             connection.setRequestProperty("connection", "Keep-Alive");             connection.setRequestProperty("user-agent",                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");             //建立连接             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，获取到cookies等 //                     for (String key : map.keySet()) { //                         log.info(key + "--->" + map.get(key)); //                     }             // 定义 BufferedReader输入流来读取URL的响应             read = new BufferedReader(new InputStreamReader(                     connection.getInputStream(),"UTF-8"));             String line;//循环读取             while ((line = read.readLine()) != null) {                 result += line;             }         } catch (IOException e) {             e.printStackTrace();         }finally{             if(read!=null){//关闭流                 try {                     read.close();                 } catch (IOException e) {                     e.printStackTrace();                 }             }         }

        return result;

    }

}