package com.briup.apps.app01.util;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;

public class AesUtil {
    static {
        //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
        Security.addProvider(new BouncyCastleProvider());
    }
 
    /**
     * AES解密
     *
     * @param data           //密文，被加密的数据
     * @param key            //秘钥
     * @param iv             //偏移量
     * @param encodingFormat //解密后的结果需要进行的编码
     * @return
     * @throws Exception
     */
    public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
 
        //被加密的数据
        byte[] dataByte = Base64.decodeBase64(data);
        //加密秘钥
        byte[] keyByte = Base64.decodeBase64(key);
        //偏移量
        byte[] ivByte = Base64.decodeBase64(iv);
        try {
            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, encodingFormat);
                return result;
            }
            return null;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidParameterSpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}

package com.briup.apps.app01.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {
    /**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            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)");
            // 建立实际的连接
            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
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    } 
}

package com.briup.apps.app01.web.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.alibaba.fastjson.JSONObject;
import com.briup.apps.app01.util.AesUtil;
import com.briup.apps.app01.util.HttpRequest;

import io.swagger.annotations.ApiOperation;

@RestController
@RequestMapping("/wx")
public class TestController {
    
    @ApiOperation("获取微信小程序的openid")
    @ResponseBody
    @RequestMapping(value = "/getOpenid", method = RequestMethod.GET)
    public Map getOpenid(String code, String encryptedData, String iv ) throws Exception{
        
        Map<String,Object> map = new HashMap<String,Object>();
        //code = "081ZExyD0qnP4j2LV5yD0hFLyD0ZExyK";
        //登录凭证不能为空
        if (code == null || code.length() == 0) {
            map.put("status", 0);
            map.put("msg", "code 不能为空");
            System.out.println("map1:" + map);
            return map;
        }
        //小程序唯一标识   (在微信小程序管理后台获取)
        String wxspAppid = "";
        //小程序的 app secret (在微信小程序管理后台获取)
        String wxspSecret = "";
        //授权（必填）
        String grant_type = "authorization_code";
        //////////////// 1、向微信服务器 使用登录凭证 code 获取 session_key 和 openid ////////////////
        //请求参数
        String params = "appid=" + wxspAppid + "&secret=" + wxspSecret + "&js_code=" + code + "&grant_type=" + grant_type;
        //发送请求
        String sr = HttpRequest.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);
        //解析相应内容（转换成json对象）
        JSONObject json = JSONObject.parseObject(sr);
        //获取会话密钥（session_key）
        String session_key = json.get("session_key").toString();
        //用户的唯一标识（openid）
        String openid = (String) json.get("openid");
        System.out.println("openid:" + openid);
        //////////////// 2、对encryptedData加密数据进行AES解密 ////////////////
        try {
            String result = AesUtil.decrypt(encryptedData, session_key, iv, "UTF-8");
            if (null != result && result.length() > 0) {
                map.put("status", 1);
                map.put("msg", "解密成功");
 
                JSONObject userInfoJSON = JSONObject.parseObject(result);
                Map<String,Object> userInfo = new HashMap<String,Object>();
                userInfo.put("openId", userInfoJSON.get("openId"));
                userInfo.put("nickName", userInfoJSON.get("nickName"));
                userInfo.put("gender", userInfoJSON.get("gender"));
                userInfo.put("city", userInfoJSON.get("city"));
                userInfo.put("province", userInfoJSON.get("province"));
                userInfo.put("country", userInfoJSON.get("country"));
                userInfo.put("avatarUrl", userInfoJSON.get("avatarUrl"));
                userInfo.put("unionId", userInfoJSON.get("unionId"));
                map.put("userInfo", userInfo);
                System.out.println("map2:" + map);
                return map;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        map.put("status", 0);
        map.put("msg", "解密失败");
        System.out.println("map3:" + map);
        return map;
    }
}

// 登录
    wx.login({
      success: res => {
        // 发送 res.code 到后台换取 openId, sessionKey, unionId
        if (res.code) {
          var code = res.code;
          console.log(res.code);
          // 获取用户信息
          wx.getSetting({
            success: ures => {
              if (ures.authSetting[\'scope.userInfo\']) {
                // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框
                wx.getUserInfo({
                  success: ures2 => {
                    // 可以将 ures2 发送给后台解码出 unionId
                    this.globalData.userInfo = ures2.userInfo;
                    console.log("获取到的用户数据：");
                    console.log(ures2)
                    JSON.stringify(ures2)
                    // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
                    // 所以此处加入 callback 以防止这种情况
                    if (this.userInfoReadyCallback) {
                      this.userInfoReadyCallback(ures2)
                    }
                    wx.request({
                      url: getApp().globalData.urlPath + "wx/getOpenid",
                      data: {
                        code: code,
                        encryptedData: ures2.encryptedData,
                        iv: ures2.iv
                      },
                      method: "Get",
                      header: {
                        \'content-type\': \'application/x-www-form-urlencoded\',
                      },
                      success: function (res) {
                        console.log("登录返回的数据：");
                        console.log(res);
                      },
                      fail: function (error) {
                        console.log(error);
                      }
                    })
                  }
                })
              }
            }
          })
        }
      }
    })