企业微信家校沟通工具类

<dependency>
    <groupId>com.github.binarywang</groupId>
    <artifactId>weixin-java-cp</artifactId>
    <version>3.8.0</version>
</dependency>

/**
 * description: 家校沟通消息发送实现
 * create by: YangLinWei
 * create time: 2020/8/31 3:12 下午
 */
public class WxCpExternalServiceImpl extends WxCpExternalContactServiceImpl {
    private final WxCpService mainService;
    public static final String GET_ALL_DEPARTMENT_LIST = "/cgi-bin/school/department/list";
    public static final String GET_STUDENT_PARENT_LIST = "/cgi-bin/school/user/list";
    private static final String MESSAGE_SEND_URL = "/cgi-bin/externalcontact/message/send";
    private static final String SUBSCRIBE_QR_CODE = "/cgi-bin/externalcontact/get_subscribe_qr_code";
    public WxCpExternalServiceImpl(WxCpService mainService) {
        super(mainService);
        this.mainService = mainService;
    }
    /**
     * 获取部门列表
     *
     * @return 获取所有部门
     */
    public String getAllDepartmentList() throws WxErrorException {
        String url = this.mainService.getWxCpConfigStorage().getApiUrl(GET_ALL_DEPARTMENT_LIST);
        return this.mainService.get(url, null);
    }
    /**
     * 获取部门列表
     *
     * @param departMentId 部门id
     * @return 获取指定部门及其下的子部门
     */
    public String getAllDepartmentList(int departMentId) throws WxErrorException {
        String url = this.mainService.getWxCpConfigStorage().getApiUrl(GET_ALL_DEPARTMENT_LIST);
        return this.mainService.get(url, "id=" + departMentId);
    }
    /**
     * 获取获取部门成员详情
     *
     * @param departMentId 部门id
     * @param featchChild  是否递归获取子部门下面的成员
     * @return
     * @throws WxErrorException
     */
    public String getUserList(int departMentId, boolean featchChild) throws WxErrorException {
        String url = this.mainService.getWxCpConfigStorage().getApiUrl(GET_STUDENT_PARENT_LIST + "?department_id=" + departMentId + (featchChild ? "&fetch_child=FETCH_CHILD" : ""));
       return this.mainService.get(url, null);
    }
    /**
     * 消息发送
     *
     * @param message 发送的消息
     * @return
     * @throws WxErrorException
     */
    public String messageSend(WxCpExternalMessage message) throws WxErrorException {
        String url = this.mainService.getWxCpConfigStorage().getApiUrl(MESSAGE_SEND_URL);
      return  this.mainService.post(url, message.toJson());
    }
    /**
     * 获取「学校通知」二维码
     *
     * @return
     * @throws WxErrorException
     */
    public String getQrCode() throws WxErrorException {
        String url = this.mainService.getWxCpConfigStorage().getApiUrl(SUBSCRIBE_QR_CODE);
        return this.mainService.get(url, null);
    }
}

// 初始化工具类
WxCpDefaultConfigImpl config = new WxCpDefaultConfigImpl();
config.setCorpId("corpId企业id");
config.setCorpSecret("corpSecret应用秘钥");
config.setAgentId("agentId应用id");
WxCpServiceImpl wxCpService = new WxCpServiceImpl();
wxCpService.setWxCpConfigStorage(config);
WxCpExternalServiceImpl wxCpExternalService = new WxCpExternalServiceImpl(wxCpService);
//发送纯文本
WxCpExternalMessage message = WxCpExternalMessage.TEXT()
                   .agentId("agentId应用id")
                   .toParentUserid("家长id集合")
                   .content("发送内容")
                   .build();
wxCpExternalService.messageSend(message);