WeChat Mini-Programm Erhalten Sie detaillierte Erklärungen und Beispielcode von WeChat OpenId

Holen Sie sich die WeChat OpenId

Holen Sie sich zuerst den Code

Dann holen Sie sich das Authtoken über den Code, nehmen Sie die OpenID vom Authtoken und geben Sie es an der Rezeption ab

Vergessen Sie nicht, das Webkonto auf der WeChat-Seite festzulegen. Den Domänennamen der Autorisierungsrückrufseite

Das Flussdiagramm sieht wie folgt aus

Haupt Code

Seiten-JS-Code

/* 写cookie */
function setCookie(name, value) {
  var Days = 30;
  var exp = new Date();
  exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
  document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString() + ";path=/";
}
/* 读cookie */
function getCookie(name) {
  var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
  if (arr != null) {
    return unescape(arr[2]);
  }
  return null;
}
 
/* 获取URL参数 */
function getUrlParams(name) {
  var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
  var r = window.location.search.substr(1).match(reg);
  if (r != null) {
    return unescape(r[2]);
  }
  return null;
}
 
/* 获取openid */
function getOpenId(url) {
  var openid = getCookie("usropenid");
  if (openid == null) {
    openid = getUrlParams('openid');
    alert("openid="+openid);
    if (openid == null) {
      window.location.href = "wxcode?url=" + url;
    } else {
      setCookie("usropenid", openid);
    }
  }
}

WxCodeServlet-Code

//访问微信获取code
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
  String state = req.getParameter("url");
  //WxOpenIdServlet的地址
  String redirect ="http://"+Configure.SITE+"/wxopenid";
  redirect = URLEncoder.encode(redirect, "utf-8");
  StringBuffer url = new StringBuffer("https://open.weixin.qq.com/connect/oauth2/authorize?appid=")
      .append(Configure.APP_ID).append("&redirect_uri=").append(redirect)
      .append("&response_type=code&scope=snsapi_base&state=").append(state).append("#wechat_redirect");
  resp.sendRedirect(url.toString());
}

WxOpenIdServlet-Code

//访问微信获取openid
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
  String code = req.getParameter("code");
  String state = req.getParameter("state");
  Result ret = new Result();
  AuthToken token = WXUtil.getAuthToken(code);
  if(null != token.getOpenid()){
    ret.setCode(0);
    log.info("====openid=="+token.getOpenid());
    Map<String,String> map = new HashMap<String,String>();
    map.put("openid", token.getOpenid());
    map.put("state", state);
    ret.setData(map);
  }else{
    ret.setCode(-1);
    ret.setMsg("登录错误");
  }
  String redUrl = state+"?openid="+token.getOpenid();
  resp.sendRedirect(redUrl);
}

AuthToken-Code (WXUtil.getAuthToken(code)) abrufen

public static AuthToken getAuthToken(String code){
  AuthToken vo = null;
  try {
    String uri = "https://api.weixin.qq.com/sns/oauth2/access_token?";
    StringBuffer url = new StringBuffer(uri);
    url.append("appid=").append(Configure.APP_ID);
    url.append("&secret=").append(Configure.APP_SECRET);
    url.append("&code=").append(code);
    url.append("&grant_type=").append("authorization_code");
    HttpURLConnection conn = HttpClientUtil.CreatePostHttpConnection(url.toString());
    InputStream input = null;
    if (conn.getResponseCode() == 200) {
      input = conn.getInputStream();
    } else {
      input = conn.getErrorStream();
    }
    vo = JSON.parseObject(new String(HttpClientUtil.readInputStream(input),"utf-8"),AuthToken.class);
  } catch (Exception e) {
    log.error("getAuthToken error", e);
  }
  return vo;
}

HttpClientUtil-Klasse

package com.huatek.shebao.util;
 
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
 
public class HttpClientUtil {
 
  // 设置body体
  public static void setBodyParameter(String sb, HttpURLConnection conn)
      throws IOException {
    DataOutputStream out = new DataOutputStream(conn.getOutputStream());
    out.writeBytes(sb);
    out.flush();
    out.close();
  }
 
  // 添加签名header
  public static HttpURLConnection CreatePostHttpConnection(String uri) throws MalformedURLException,
      IOException, ProtocolException {
    URL url = new URL(uri);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setUseCaches(false);
    conn.setDoInput(true);
    conn.setDoOutput(true);
    conn.setRequestMethod("POST");
    conn.setInstanceFollowRedirects(true);
    conn.setConnectTimeout(30000);
    conn.setReadTimeout(30000);
    conn.setRequestProperty("Content-Type","application/json");
    conn.setRequestProperty("Accept-Charset", "utf-8");
    conn.setRequestProperty("contentType", "utf-8");
    return conn;
  }
 
  public static byte[] readInputStream(InputStream inStream) throws Exception {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while ((len = inStream.read(buffer)) != -1) {
      outStream.write(buffer, 0, len);
    }
    byte[] data = outStream.toByteArray();
    outStream.close();
    inStream.close();
    return data;
  }
 
}

Die VO-Klasse, die AuthToken kapselt

package com.huatek.shebao.wxpay;
 
public class AuthToken {
  private String access_token;
  private Long expires_in;
  private String refresh_token;
  private String openid;
  private String scope;
  private String unionid;
  private Long errcode;
  private String errmsg;
  public String getAccess_token() {
    return access_token;
  }
  public void setAccess_token(String access_token) {
    this.access_token = access_token;
  }
  public Long getExpires_in() {
    return expires_in;
  }
  public void setExpires_in(Long expires_in) {
    this.expires_in = expires_in;
  }
  public String getRefresh_token() {
    return refresh_token;
  }
  public void setRefresh_token(String refresh_token) {
    this.refresh_token = refresh_token;
  }
  public String getOpenid() {
    return openid;
  }
  public void setOpenid(String openid) {
    this.openid = openid;
  }
  public String getScope() {
    return scope;
  }
  public void setScope(String scope) {
    this.scope = scope;
  }
  public String getUnionid() {
    return unionid;
  }
  public void setUnionid(String unionid) {
    this.unionid = unionid;
  }
  public Long getErrcode() {
    return errcode;
  }
  public void setErrcode(Long errcode) {
    this.errcode = errcode;
  }
  public String getErrmsg() {
    return errmsg;
  }
  public void setErrmsg(String errmsg) {
    this.errmsg = errmsg;
  }
}