app接入第三方微信登陆功能：

移动应用微信登录是基于OAuth2.0协议标准 构建的微信OAuth2.0授权登录系统，前提你需要到微信开放平台注册开发者帐号，并拥有一个已审核通过的移动应用，并获得相应的AppID和AppSecret，申请微信登录且通过审核后，可开始接入流程。

接入微信登陆授权步骤：

1. 第三方发起微信授权登录请求，微信用户允许授权第三方应用后，微信会拉起应用或重定向到第三方网站，并且带上授权临时票据code参数；

2. 通过code参数加上AppID和AppSecret等，通过API换取access_token；

3. 通过access_token进行接口调用，获取用户基本数据资源或帮助用户实现基本操作。

注意：同一个微信开放平台下绑定的用户，在不同的应用下用户的UnionID就是相同的，openId是不相同的。

获取access_token流程：

第一步：请求CODE：

需要app调起微信

第二步：通过code获取access_token：

请求路径：https://api.weixin.qq.com/sns/oauth2/access_token？appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

参数：

appid	是	应用唯一标识，在微信开放平台提交应用审核通过后获得
secret	是	应用密钥AppSecret，在微信开放平台提交应用审核通过后获得
code	是	填写第一步获取的code参数
grant_type	是	填authorization_code

 appid与secret需要通过注册获取。

第三步：通过access_token调用接口

获取access_token后，进行接口调用，有以下前提：

• access_token有效且未超时；
• 微信用户已授权给第三方应用帐号相应接口作用域（scope）。

代码：

请求微信工具类：

package com.maobc.util;import com.alibaba.fastjson.JSONObject;
import com.maobc.entity.jar.Member;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.poi.ss.formula.functions.T;
import springfox.documentation.spring.web.json.Json;import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URI;/*** @program: maobc-small_routine* @description: app用户登陆* @author: z.hw**/
public class WeixinLoginUtils {/*** 微信登陆通过code获取accessToken* @param appId* @param userAppSecret* @param code* @return* @throws Exception*/public StringBuilder getAccessTokenBycode(String appId,String userAppSecret,String code) throws Exception{//查看官方文档 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317853&token=&lang=String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appId+"&secret="+userAppSecret+"&code="+code+"&grant_type=authorization_code";URI uri = URI.create(url);HttpClient client = HttpClients.createDefault();HttpGet get = new HttpGet(uri);HttpResponse response=client.execute(get);StringBuilder sb = new StringBuilder();if (response.getStatusLine().getStatusCode() == 200) {HttpEntity entity = response.getEntity();BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));for (String temp = reader.readLine(); temp != null; temp = reader.readLine()) {sb.append(temp);}}return sb;}/*** access_token是否有效的验证* @param accessToken* @param openID* @return*/public boolean isAccessTokenIsInvalid(String accessToken,String openID) throws Exception{String url = "https://api.weixin.qq.com/sns/auth?access_token=" + accessToken + "&openid=" + openID;URI uri = URI.create(url);HttpClient client = HttpClients.createDefault();HttpGet get = new HttpGet(uri);HttpResponse response = client.execute(get);if (response.getStatusLine().getStatusCode() == 200) {HttpEntity entity = response.getEntity();BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));StringBuilder sb = new StringBuilder();for (String temp = reader.readLine(); temp != null; temp = reader.readLine()) {sb.append(temp);}JSONObject object = JSONObject.parseObject(sb.toString().trim());int errcode = object.getInteger("errcode");if (errcode == 0) {//未失效return true;}}return false;}/*** access_token       接口调用凭证* expires_in        access_token接口调用凭证超时时间，单位（秒）* refresh_token     用户刷新access_token* openid           授权用户唯一标识* scope          用户授权的作用域，使用逗号（,）分隔* @param APP_ID*/public JSONObject refreshAccessToken(String APP_ID,String refreshToken) throws Exception{/*** access_token是调用授权关系接口的调用凭证，由于access_token有效期（目前为2个小时）较短，当access_token超时后，可以使用refresh_token进行刷新，access_token刷新结果有两种：** 1.若access_token已超时，那么进行refresh_token会获取一个新的access_token，新的超时时间；** 2.若access_token未超时，那么进行refresh_token不会改变access_token，但超时时间会刷新，相当于续期access_token。** refresh_token拥有较长的有效期（30天）且无法续期，当refresh_token失效的后，需要用户重新授权后才可以继续获取用户头像昵称。*/String uri = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + APP_ID + "&grant_type=refresh_token&refresh_token=" + refreshToken;HttpClient client = HttpClients.createDefault();HttpGet get = new HttpGet(URI.create(uri));HttpResponse response = client.execute(get);JSONObject object =new JSONObject();if (response.getStatusLine().getStatusCode() == 200) {BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));StringBuilder builder = new StringBuilder();for (String temp = reader.readLine(); temp != null; temp = reader.readLine()) {builder.append(temp);}object = JSONObject.parseObject(builder.toString().trim());}return object;}/*** 得到用户基本信息* @param accessToken* @param openId* @param tClass* @return* @throws Exception*/public <T> T    getAppWeiXinUserInfo(String accessToken, String openId, Class<T> tClass) throws Exception{String uri = "https://api.weixin.qq.com/sns/userinfo?access_token="+accessToken+"&openid="+openId;HttpClient client = HttpClients.createDefault();HttpGet get = new HttpGet(URI.create(uri));HttpResponse response = client.execute(get);if (response.getStatusLine().getStatusCode() == 200) {BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));StringBuilder builder = new StringBuilder();for (String temp = reader.readLine(); temp != null; temp = reader.readLine()) {System.out.println(temp);builder.append(temp);}return JSONObject.parseObject(builder.toString(), tClass);}return null;}}

controller: 

   /*** @Description:  app微信登陆* @Author: z.hw*/@RequestMapping(value = {"getUserInfoByAppCode"})@ApiOperation(value = "getUserInfoByAppCode", notes = "不分页", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)@ApiResponses(value = {@ApiResponse(code = 404, message = "Not Found"),@ApiResponse(code = 400, message = "No Name Provided"),})publicApiResult getUserInfoByApp(@Validated UserAppAuthority userAppAuthority){return memberService.getUserInfoByApp(userAppAuthority);}

请求体：

/*** @program: maobc-small_routine* @description: app微信授权* @author: z.hw**/
@Data
public class UserAppAuthority {//新旧app 用来备份 自定义数据@NotNull(message = "类型不能为空")@NotEmpty(message = "类型不能为空")private String type;//重点需要 app调起微信获取到的code@NotEmpty(message = "code不能为空")@NotNull(message = "code不能为空")private String code;}

ApiResult：

@Data
@ToString(callSuper = true)
@EqualsAndHashCode
public class ApiResult<T> implements Serializable {/*** 状态码* 0表示成功*/private String  code = "0000";/*** 状态信息*/private String msg = "调用成功";private Object result;。。。。。。。。。。。。。}

 业务层：

/*** @Description: 用户app微信登陆* @Param:* @return:* @Author: z.hw*/public ApiResult getUserInfoByApp(UserAppAuthority userAppAuthority) {try {Member member = new Member();BeanUtils.copyProperties(userAppAuthority, member);//调用微信授权WeixinLoginUtils weixinLoginUtils = new WeixinLoginUtils();StringBuilder stringBuilder = weixinLoginUtils.getAccessTokenBycode(commConfig.userAppID, commConfig.userAppSecret, userAppAuthority.getCode());if (stringBuilder != null) {if (stringBuilder.toString().trim().contains("errcode")) {return ApiResult.Fail();}JSONObject object = JSONObject.parseObject(stringBuilder.toString().trim());String accessToken = object.getString("access_token"); //接口调用凭证String openID = object.getString("openid"); //授权用户唯一标识//获取微信用户基本信息WeiXinParam appWeiXinUserInfo = weixinLoginUtils.getAppWeiXinUserInfo(accessToken, openID, WeiXinParam.class);// TODO 业务逻辑。。。。。。。。。。。。return ApiResult.build(member);}} catch (Exception e) {e.printStackTrace();}return MaobcApiResult.Fail();}

Member：

  

import lombok.*;import javax.persistence.*;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;/*** @author*/
@Entity
@Table(name = "cat_member")
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = false)
@AllArgsConstructor
@NoArgsConstructor
@Data
public class Member implements Serializable {private static final long serialVersionUID = -27353316177184L;@Id@GeneratedValue(strategy = GenerationType.AUTO)@Column(name = "id")private String id;/*** 账号状态:0 正常；1 冻结*/@Column(name = "status")private String status;/*** del_flag*/@Column(name = "del_flag")private String delFlag;/*** 手机*/@Column(name = "mobile_phone")private String mobilePhone;/*** 用户名*/@Column(name = "user_name")private String userName;/*** 邮箱*/@Column(name = "email")private String email;/*** 用户密码*/@Column(name = "password")private String password;/*** 昵称*/@Column(name = "nickname")private String nickname;/*** 性别*/@Column(name = "sex")private String sex;/*** 头像url*/@Column(name = "headimgurl")private String headimgurl;/*** 城市*/@Column(name = "city")private String city;/*** 国家*/@Column(name = "country")private String country;/*** 省份*/@Column(name = "province")private String province;/*** 语言*/@Column(name = "language")private String language;/*** 备注*/@Column(name = "remark")private String remark;/*** 生日*/@Column(name = "birthday")private String birthday;/*** 地址*/@Column(name = "address")private String address;/*** 会员积分*/@Column(name = "accumulate_points")private BigDecimal accumulatePoints;/*** 平台会员等级*/@Column(name = "level")private Integer level;/*** cat_membership会员类型表的ID*/@Column(name = "membership_id")private String membershipId;/*** 创建人*/@Column(name = "create_by")private String createBy;/*** 创建时间*/@Column(name = "create_date")private Date createDate;/*** 修改人*/@Column(name = "update_by")private String updateBy;/*** 修改时间*/@Column(name = "update_date")private Date updateDate;/*** 会员是否同意条款标识(0-未同意 1-同意)*/@Column(name = "item_status")private Integer itemStatus;private String openid;private String unionId;private String type;//是否绑定手机号码private String isBindedPhone;private String oauthId;private String memberId;private String outhId;}

WeiXinParam ： 

import lombok.Data;@Data
public class WeiXinParam {String openid = "";String unionId = "";String sex = "1";String nickname = "";String city = "";String province = "";String country = "";String avatarUrl = "";String headimgurl="";}

参考资料：

微信开发平台：https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&lang=zh_CN