按照惯例，先是官方传送门：https://developers.weixin.qq.com/miniprogram/dev/api/api-login.html
1.登录流程介绍
调用微信开放接口wx.login获取一个临时的登录凭证code
微信小程序通过https请求访问自己的服务器，服务器携带登录凭证code以及小程序的appid和appsecret从微信服务器中获取openid和session_key，UnionID 只在满足一定条件的情况下返回，另外，一个code只能使用一次。
2.开发
2.1 前端
wxml：
<
button
class=
"login"
type=
""
open-type=
"getUserInfo"
bindgetuserinfo=
"login">微信登录
</
button
>
wxss：（目的是为了去除微信button自带的样式）
.login{
background-color:
#FFF;
box-sizing:
unset;
}
.login::after{
border:
0
rpx;
}
感受一下加了这段css的前后变化
js：
login:
function (e) {
var that =
this;
//调用登录接口，获取 code
if (wx.getStorageSync(
"userInfo") && wx.getStorageSync(
"empInfo")){
return;
}
wx.login({
success:
function (res) {
wx.getSetting({
success(setRes) {
// 判断是否已授权
if (!setRes.authSetting[
'scope.userInfo']) {
// 授权访问
wx.authorize({
scope:
'scope.userInfo',
success() {
//获取用户信息
wx.getUserInfo({
lang:
"zh_CN",
success:
function (userRes) {
//发起网络请求
wx.request({
//url: API_URL,
url: address+
'getWxUserInfo',
data: {
grant_type:
"authorization_code",
encryptedData: userRes.encryptedData,
iv: userRes.iv,
code: res.code
},
header: {
"Content-Type":
"application/x-www-form-urlencoded"
},
method:
'POST',
//服务端的回掉
success:
function (result) {
var openid = result.data.openid;
var session_key = result.data.session_key
that.data.userInfo.openid = openid;
that.data.userInfo.session_key = session_key;
wx.setStorageSync(
"userInfo", that.data.userInfo);
that.showModal();
}, fail:
function () {
wx.showToast({
title:
'服务器异常，清稍候再试',
icon:
'none'
})
}
})
},
})
}
})
}
else {
//获取用户信息
wx.getUserInfo({
lang:
"zh_CN",
success:
function (userRes) {
that.setData({
userInfo: userRes.userInfo
})
//发起网络请求
wx.request({
url: address +
'getWxUserInfo' ,
data: {
grant_type:
"authorization_code",
encryptedData: userRes.encryptedData,
iv: userRes.iv,
code: res.code,
},
header: {
"Content-Type":
"application/x-www-form-urlencoded"
},
method:
'POST',
success:
function (result) {
var openid = result.data.openid;
var session_key = result.data.session_key
that.data.userInfo.openid = openid;
that.data.userInfo.session_key = session_key;
wx.setStorageSync(
"userInfo", that.data.userInfo);
that.showModal();
}, fail:
function () {
wx.showToast({
title:
'服务器异常，清稍候再试',
icon:
'none'
})
}
})
}
})
}
}
})
}, fail:
function (res) {
wx.showToast({
title:
'获取授权信息失败',
icon:
'none'
})
}
})
},
java后端：
https请求：
@RequestMapping("/getWxUserInfo")public static JSONObject getSessionKeyOropenid(String grant_type,String code,String iv,String encryptedData){
//微信端登录code值
//String wxCode = code;
//ResourceBundle resource = ResourceBundle.getBundle("weixin"); //读取属性文件
//String requestUrl = resource.getString("url"); //请求地址 https://api.weixin.qq.com/sns/jscode2session
Map<String,String> requestUrlParam = new HashMap<String,String>();
requestUrlParam.put("appid", WXConst.appId); //开发者设置中的appId
requestUrlParam.put("secret", WXConst.appSecret); //开发者设置中的appSecret
requestUrlParam.put("js_code", code); //小程序调用wx.login返回的code
requestUrlParam.put("grant_type", grant_type); //默认参数
//发送post请求读取调用微信 https://api.weixin.qq.com/sns/jscode2session 接口获取openid用户唯一标识
JSONObject jsonObject = JSON.parseObject(UrlUtil.sendPost(WXConst.WxGetOpenIdUrl, requestUrlParam));
return jsonObject;
}
UrlUtil.java
private static Logger log = Logger.getLogger(UrlUtil.class);/**
* 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
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, Map<String, ?> paramMap) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
String param = "";
Iterator<String> it = paramMap.keySet().iterator();
while (it.hasNext()) {
String key = it.next();
param += key + "=" + paramMap.get(key) + "&";
}
param = param.substring(0,param.length()-1);
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("Accept-Charset", "utf-8");
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(), "UTF-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
log.error(e.getMessage(), e);
}
// 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;
}
WXConst.java
//微信小程序appidpublic static String appId = "";
//微信小程序appsecret
public static String appSecret = "";
//获取微信Openid的请求地址
public static String WxGetOpenIdUrl = "https://api.weixin.qq.com/sns/jscode2session";
就这样就好啦~很简单呐！！！