微信模板消息推送java开发：

一、先查看微信官网定义的模板推送接口需要的参数

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接口参数强调：
access_token:根据获取access_token接口使用appid和secret作为参数获取，而不能用授权时返回的access_token,授权时返回的是授权access_token,注意其与普通access_token的区别

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获取普通access_token的接口

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模板id需要在微信官方申请自己企业的推送模板，成功会获得一个模板id

二、准备工作，创建所需要的实体类

1、模板消息实体类

//模板消息实体类
public class TemplateData {
    private String value;//模板的值

    private String color;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }
}

2、access_token实体类

//access_token实体类
public class AccessToken {

    private String access_token;

    private String expires_in;

    public String getAccess_token() {
        return access_token;
    }

    public void setAccess_token(String access_token) {
        this.access_token = access_token;
    }

    public String getExpires_in() {
        return expires_in;
    }

    public void setExpires_in(String expires_in) {
        this.expires_in = expires_in;
    }
}

三、消息推送service

1、获取access_token方法

//1、获取access_token方法
  public String getAccess_token() {
        //获取access_token
        String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential" +
                "&appid=" + appId + "&secret=" + secret;
        String json = HttpClientUtilCore.doGet(url);
        JSONObject jsonObject = JSONObject.parseObject(json);
        AccessToken accessToken = JSONObject.toJavaObject(jsonObject, AccessToken.class);
        return accessToken.getAccess_token();
    }

2、消息推送方法

 //用于向微信端发送请求
    public String sendMessage(String openId){

        //获取access_token
        String access_token = getAccess_token();
        String url = "https://api.weixin.qq.com/cgi-bin/message/template/send" +
                "?access_token=" + access_token;

        CloseableHttpClient httpClient  = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        // 封装post请求参数
        JSONObject json = new JSONObject();
        json.put("touser", openId);
        json.put("template_id", moduleId);//设置模板id
        json.put("url", htmlRedirectUri + "/#/"+flowMessage.getRouterName()+"/"+flowMessage.getFlowId());
        JSONObject dataJson = new JSONObject();
        TemplateData first = new TemplateData();
        first.setValue("流程信息");
        first.setColor("#173177");
        dataJson.put("first",first);
        TemplateData keyword1 = new TemplateData();
        keyword1.setValue("流程信息");
        keyword1.setColor("#173177");
        dataJson.put("keyword1",keyword1);
        TemplateData keyword2 = new TemplateData();
        keyword2.setValue("流程信息");
        keyword2.setColor("#173177");
        dataJson.put("keyword2",keyword2);
        TemplateData keyword3 = new TemplateData();
        keyword3.setValue("流程信息");
        keyword3.setColor("#173177");
        dataJson.put("keyword3",keyword3);
        TemplateData keyword4 = new TemplateData();
        keyword4.setValue(flowMessage.getAgoDate());
        keyword4.setColor("#173177");
        dataJson.put("keyword4",keyword4);
        TemplateData keyword5 = new TemplateData();
        keyword5.setValue("流程信息");
        keyword5.setColor("#173177");
        dataJson.put("keyword5",keyword5);
        TemplateData remark = new TemplateData();
        remark.setValue("流程信息");
        remark.setColor("#FF0000");
        dataJson.put("remark",remark);
        json.put("data", dataJson);
        String resultStr = "发送失败";
        try {
            StringEntity myEntity = new StringEntity(json.toJSONString(), ContentType.APPLICATION_JSON);

            // 设置请求参数
            httpPost.setEntity(myEntity);
            HttpResponse httpResponse = httpClient.execute(httpPost);
            System.out.println(httpResponse.getStatusLine().getStatusCode());
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                // 发送成功
                String resutlEntity = EntityUtils.toString(httpResponse.getEntity());
                System.out.println(resutlEntity);
                resultStr = "发送成功";
                return resultStr;
            } else {
                // 发送失败
                return resultStr;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (httpClient != null) {
                    // 关闭请求
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultStr;
    }