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面向新手《二十三》微信小程序简单总结，获取openid实例，

发布者: chinasars | 发布时间: 2018-1-27 19:29| 查看数: 8264| 评论数: 1|帖子模式

微信小程序简单总结" style="margin: 20px 0px; font-family: 'PingFang SC', 'Hiragino Sans GB', 'Helvetica Neue', 'Microsoft Yahei', 'WenQuanYi Micro Hei', sans-serif; font-weight: 500; line-height: 40px; color: rgb(44, 62, 80); text-rendering: optimizeLegibility; font-size: 21px; background-color: rgb(249, 249, 245);">一：微信小程序简单总结

作者：赵吉彤，来自授权地址

1、添加一些图片素材（网上找的），复制到项目的根目录下面，和pages目录同级

2、查看微信文档介绍

3、打开blog文件夹，编辑blog.js，page函数里面添加对象，data对象表示数据，即和后台交互的数据都在这里面存储和展示，onLoad,onReady等函数是微信在页面加载时默认存在的函数，我们可以重写，实现我们自己的逻辑

4、点击编译查看对应的效果，及函数加载顺序,onLoad、onShow 、onReady的加载顺序

5、网络请求

打开微信文档，里面有对应的网络请求api，wx.request（），接收一个对象，包含我们请求的各种参数（交互的域名正式环境有限制，而且需要为https）

6、编辑blog.js，在onLoad函数里面发起网络请求，接口地址是我测试用的地址，会返回对应的数据列表，注意的地方是this指向问题，因为是在回调函数里面获取数据的，然后需要放到data对象里面，所以需要提前保存this对象的地址

现在进入页面就可看到控制台打印接收到的数据了（数据请求也可以这样发送）

//发起网络请求  
   wx.request({  
    url: app.globalData.blog_url+'/article/findHotArticles.action',  
    data:{  
        size:20  
    },  
    success: function(res) {  
      console.log(res.data);  
      //把获取到的结果放到数据层  
      that.setData({  
         list:res.data  
        })  
    }  
  })

7、ok，现在就是展示数据的时候了,打开微信微信官方文档，主要使用的是view标签，详情参考文档

8、展示层代码，使用遍历文章对象，{{}} 取的是data数据层里面的数据，

9、绑定的下拉函数（不做处理）

10、处理样式，view标签可以使用CSS3的样式，并且微信本身也提供一些计算尺寸的方法，也支持样式选择器，类选择器，id选择器，直接看代码，编辑我们的blog.wxss

11、现在就可以保存，然后点击左侧的编译，就完成了列表展示

二：获取openid实例

作者：appss，来自原文地址

获取微信OpenId

先获取code
再通过code获取authtoken，从authtoken中取出openid给前台
微信端一定不要忘记设定网页账号中的授权回调页面域名

流程图如下

主要代码

页面js代码

/* 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代码

//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("")
      .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代码

//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);
}
复制代码
获取AuthToken（WXUtil.getAuthToken(code)）代码
public static AuthToken getAuthToken(String code){
  AuthToken vo = null;
  try {
    String uri = "";
    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类

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;
  }
}

封装AuthToken的VO类

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;
  }
}

两个微信

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