前言：起因是打开登录页面，第一次点击登录 请求后端接口会报解密异常，第二次解密正常，再点还是解密正常
解决方法: 把wxcode 在页面打开时，加载一次，然后由调用获取用户信息接口，把这个code ，encryptedData ，iv 传递给后端，后端请求jscode2session获得sessionKey，把sessionKey，encryptedData ，iv，传入微信解密工具类，返回解密数据，剩下的就正常存储用户信息，返回信息就行了
前端相关代码展示
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| export default {
data() {
return {
wxCode: '',
encryptedData: '',
iv: ''
}
},
onLoad() {
let self = this;
wx.login({
success(res) {
if (res.code) {
self.wxCode = res.code
}
}
})
},
methods: {
wxLogin() {
const self = this;
wx.getUserProfile({
desc: '用于完善会员资料',
success: (res) => {
let param = {
wxCode: this.wxCode,
encryptedData: res.encryptedData,
iv: res.iv,
};
let _callback = (res) => {
console.log(res)
};
self.ajax('post', '/weChatLogin', param, _callback, self);
}
});
}
}
}
|
后端相关代码展示
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|
public static String decryptWXAppletInfo(String sessionKey, String encryptedData, String iv) {
String result = null;
byte[] dataByte = java.util.Base64.getDecoder().decode(encryptedData);
byte[] keyByte = java.util.Base64.getDecoder().decode(sessionKey);
byte[] ivByte = Base64.getDecoder().decode(iv);
try {
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;
}
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivByte);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(keyByte, "AES");
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] doFinal = cipher.doFinal(dataByte);
result = new String(doFinal);
return result;
} catch (Exception e) {
log.error("解密，获取微信信息错误", e);
}
return null;
}
```
|
