微信公众号开发(四)

获取用户信息

• 第一步

用户同意授权，获取code

引导关注者打开如下页面：

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
来获取code, 如果用户同意授权，页面将跳转至 redirect_uri/?code=CODE&state=STATE。若用户禁止授权，则重定向后不会带上code参数，仅会带上state参数redirect_uri?state=STATE

• 第二步

通过code换取网页授权access_token

获取code后，请求以下链接获取access_token和opendi：
https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

正确时返回的JSON数据包如下：

{
"access_token":"ACCESS_TOKEN",
"expires_in":7200,
"refresh_token":"REFRESH_TOKEN",
"openid":"OPENID",
"scope":"SCOPE"
}

• 第三步

刷新access_token（如果需要）

获取第二步的refresh_token后，请求以下链接获取access_token：
https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=APPID&grant_type=refresh_token&refresh_token=REFRESH_TOKEN

• 第四步

拉取用户信息(需scope为 snsapi_userinfo)

请求http：GET（请使用https协议）
https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN

正确时返回的JSON数据包如下：

{
"openid":" OPENID",
" nickname": NICKNAME,
"sex":"1",
"province":"PROVINCE"
"city":"CITY",
"country":"COUNTRY",
"headimgurl": "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/46",
"privilege":[
"PRIVILEGE1"
"PRIVILEGE2"
],
"unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
}

正式开发

在开发前首先需要在公众平台里设置网页授权信息

首先我们这里是用springmvc的，这里就不多说了，这里编写了一个userAction，我们在微信的自定义菜单添加一个按钮指向这里的getWxUserMsg方法，自定义菜单的设置在之前已经说过了。

package com.feng.web.controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.feng.web.model.WebAccessToken;
import com.feng.web.model.WxConfig;
import com.feng.web.model.WxUser;
import com.feng.web.service.util.GsonUtils;
import com.feng.web.service.util.NetUtil;

@Controller
@RequestMapping(value="/user")
public class UserAction {

@RequestMapping(value="getWxUserMsg", method=RequestMethod.GET)
public String getWxUserMsg(Model model, String code){
System.out.println("useraction: "+code);
String url = String.format(WxConfig.GET_WEBTOKEN, "wxa1d7918774ce0f09", "8cfb267d462eae71fb365eb9e35dc201", code);

String resp = NetUtil.httpGet(url);

WebAccessToken webAccessToken = GsonUtils.json2Bean(resp, WebAccessToken.class);
if(webAccessToken != null){
url = String.format(WxConfig.GET_USERMSG, webAccessToken.getAccess_token(), webAccessToken.getOpenid());
resp = NetUtil.httpGet(url);
model.addAttribute("user", GsonUtils.json2Bean(resp, WxUser.class));
}

return "user/wsusermsg";
}
}

WebAccessToken

package com.feng.web.model;

public class WebAccessToken {

private String access_token;
private int expires_in;
private String refresh_token;
private String openid;
private String scope;
public String getAccess_token() {
return access_token;
}
public void setAccess_token(String access_token) {
this.access_token = access_token;
}
public int getExpires_in() {
return expires_in;
}
public void setExpires_in(int 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;
}
@Override
public String toString() {
return "WebAccessToken [access_token=" + access_token + ", expires_in="
+ expires_in + ", refresh_token=" + refresh_token + ", openid="
+ openid + ", scope=" + scope + "]";
}
}

WxConfig

package com.feng.web.model;

public class WxConfig {

//http请求方式: POST/FORM,需使用https
public static final String UPLOAD_MEDIA = "https://api.weixin.qq.com/cgi-bin/media/upload";
//http请求方式: GET,https调用
public static final String DOWNLOAD_MEDIA = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=%s&media_id=%s";
//获取网页授权token
public static final String GET_WEBTOKEN = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=%s&secret=%s&code=%s&grant_type=authorization_code";
//获取用户信息
public static final String GET_USERMSG = "https://api.weixin.qq.com/sns/userinfo?access_token=%s&openid=%s&lang=zh_CN";
}

获取完会跳转到wsusermsg.jsp, 这里就简单地显示用户的信息

openid: ${user.openid}

nickname: ${user.nickname}

sex: ${user.sex}

province: ${user.province}

city: ${user.city}

country: ${user.country}

headimgurl: ${user.headimgurl}



unionid: ${user.unionid}

调试结果：