How to Send AlertOver Push Notifications with Java HttpClient – Full Code Example

AlertOver is a push‑notification service that offers a simple HTTP API, but its official documentation lacks a Java example. The following guide shows how to build a Java method that posts a JSON payload to the AlertOver endpoint using Apache HttpClient.

public static void sendMessageToMobile(String title, String content, String receiver) throws JSONException, ClientProtocolException, IOException {
    String source = "s-6bf44a17-73ba-45dc-9443-c34c5d53"; // AlertOver source ID
    if (title == null) {
        title = "测试"; // default title
    }
    if (content == null) {
        content = "我是008！"; // default content
    }
    // Convert to ISO‑8859‑1 to match API expectations
    title = new String(title.getBytes(), "ISO-8859-1");
    content = new String(content.getBytes(), "ISO-8859-1");

    CloseableHttpClient httpClients = HttpClients.createDefault(); // create client
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("source", source.trim());
    jsonObject.put("receiver", receiver.trim());
    jsonObject.put("content", content.trim());
    jsonObject.put("title", title.trim());

    HttpPost httpPost = new HttpPost("https://api.alertover.com/v1/alert"); // API endpoint
    StringEntity entity = new StringEntity(jsonObject.toString());
    entity.setContentEncoding("ISO-8859-1");
    entity.setContentType("application/json");
    httpPost.setEntity(entity);

    HttpResponse res = httpClients.execute(httpPost);
    if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
        output("测试发送消息成功！");
    } else {
        HttpEntity httpEntity = res.getEntity();
        output(httpEntity.toString());
    }
    httpClients.close(); // release resources
}

The method performs the following steps:

Define the AlertOver source identifier.

Provide default values for title and content when they are null.

Convert title and content to ISO-8859-1 encoding as required by the API.

Construct a JSONObject containing source, receiver, title, and content.

Create an HttpPost request to https://api.alertover.com/v1/alert and attach the JSON payload as a StringEntity with the appropriate content type.

Execute the request with a CloseableHttpClient and check the HTTP status code.

Print a success message if the response status is 200 OK; otherwise, output the raw response entity for debugging.

Close the HTTP client to free resources.

Important note: This snippet demonstrates a single‑request usage of HttpClient and is intended for demonstration purposes only. In a real‑world notification module you should consider using a connection pool, asynchronous execution, and proper error handling to suit the needs of your project.