1.微信官方文档auth.code2Session | 微信开放文档
2.我们来实现这个登录功能, 直接上完整代码
controller
<!-- 工具类-JSONUtil --><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.13</version></dependency>
/*** 解密用户敏感数据** @param encryptedData 明文,加密数据* @param iv 加密算法的初始向量* @param code用户允许登录后，回调内容会带上 code（有效期五分钟），开发者需要将 code 发送到开发者服务器后台，使用code 换取 session_key api，将 code 换成 openid 和 session_key* @return*/@ApiOperation("登录")@GetMapping("/login")public Map decodeUserInfo(String encryptedData, String iv, String code) {Map map = new HashMap();//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");return map;}//小程序唯一标识 (在微信小程序管理后台获取)String wxspAppid = "xxxxxx";//小程序的 app secret (在微信小程序管理后台获取)String wxspSecret = "xxxxxx";//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./sns/jscode2session", params);//解析相应内容（转换成json对象）JSONObject json = JSONUtil.parseObj(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");// 2、对encryptedData加密数据进行AES解密try {String result = WxAesUtils.decryptData(getURLDecoderString(encryptedData), session_key, getURLDecoderString(iv));if (null != result && result.length() > 0) {map.put("status", 1);map.put("msg", "解密成功");JSONObject userInfoJSON = JSONUtil.parseObj(result);Map userInfo = new HashMap();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);return map;}} catch (Exception e) {e.printStackTrace();}map.put("status", 0);map.put("msg", "解密失败");return map;}
utils
import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import .URL;import .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;}}
import mons.codec.binary.Base64;import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;import java.security.Key;import java.security.Security;import java.util.Arrays;/*** 微信通讯加解密类*/public class WxAesUtils {public static void main(String[] args) {decryptData("bmdheU9pKVKVyJOH8CR3mqp4mEeKZ1YOuMsVxXJKjRdc47rolEoe85JKAVEWmP2hl4NZB66qxN/NHHGsy0PqCn7hS4cLKqTgERXcYO0dURt2JuLg1myhG+PYhi0AROwfJytGBv77u8yinmMfyyKx6lSegkqnlIJ6TBIDYe2LCvW3kRVDzNDeWT0hOaLiRI6n3TFQwI0b5Tiu48UbFTHDhAtJ6LaZY+wg+PdtrHDgjWtt46pinENV22GFt77a6iIhdT4GzaW7ln45HuENtzXJLR5yM7SwT2pxKMGEknJGJD3yf/DxnR6a8HpXrwxtXHJfDlUzNS+Af51fOS/Z52LpbtvRecoEz8KKUxJ9lpcK1HrO/RMw/iYf+ce1bu5VIpYyMjTNAoLdffZ7V0HGMrVJUGbQMqk7ZjdCk1eqMyPpuIOuektgKE7K5wHqeo3NVo7A","6pOQ1+4ca2ATDaSg4gauVA==","zzmYGLoLH548Vf0fdJHHvA==");}public static String decryptData(String encryptDataB64, String sessionKeyB64, String ivB64) {String data = null;try {data = new String(decryptOfDiyIV(Base64.decodeBase64(encryptDataB64),Base64.decodeBase64(sessionKeyB64),Base64.decodeBase64(ivB64)));} catch (Exception e) {e.printStackTrace();}return data;}private static final String KEY_ALGORITHM = "AES";private static final String ALGORITHM_STR = "AES/CBC/PKCS7Padding";private static Key key;private static Cipher cipher;private static void init(byte[] keyBytes) {// 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 (keyBytes.length % base != 0) {int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);byte[] temp = new byte[groups * base];Arrays.fill(temp, (byte) 0);System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);keyBytes = temp;}// 初始化Security.addProvider(new BouncyCastleProvider());// 转化成JAVA的密钥格式key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);try {// 初始化ciphercipher = Cipher.getInstance(ALGORITHM_STR, "BC");} catch (Exception e) {e.printStackTrace();}}/*** 解密方法** @param encryptedData 要解密的字符串* @param keyBytes解密密钥* @param ivs 自定义对称解密算法初始向量 iv* @return 解密后的字节数组*/private static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes, byte[] ivs) {byte[] encryptedText = null;init(keyBytes);try {cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));encryptedText = cipher.doFinal(encryptedData);} catch (Exception e) {e.printStackTrace();}return encryptedText;}}
/*** 解码* @param str* @return*/public static String getURLDecoderString(String str) {String result = "";if (null == str) {return "";}try {result = .URLDecoder.decode(str, "GBK");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return result;}
获取到的用户信息:
{"nickName":"木笔","gender":0,"language":"zh_CN","city":"","province":"","country":"","avatarUrl":"/mmopen/vi_32/Q0j4TwGTfTKDKIibHfOlhMmLib2tU491TpbTzvjHtw2TL38LM30ao5KRZL0A20PIeyhJ8ZGWMvHUDSabatHhic1PQ/132","watermark":{"timestamp":1652235161,"appid":"wx6db597cba4914b30"}}
{"nickName":"木笔","gender":0,"language":"zh_CN","city":"","province":"","country":"","avatarUrl":"/mmopen/vi_32/Q0j4TwGTfTKDKIibHfOlhMmLib2tU491TpbTzvjHtw2TL38LM30ao5KRZL0A20PIeyhJ8ZGWMvHUDSabatHhic1PQ/132","watermark":{"timestamp":1652235161,"appid":"wx6db597cba4914b30"}}
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