js调用后台servlet方法

function callServlet() {
    fetch('your-servlet-url', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ key: 'value' })
    })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));
}

@WebServlet("/your-servlet-url")
public class YourServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        BufferedReader reader = request.getReader();
        String line;
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        JSONObject json = new JSONObject(sb.toString());
        // 处理 JSON 数据
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        out.print(new JSONObject().put("status", "success").toString());
        out.flush();
    }
}

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
response.setHeader("Access-Control-Allow-Headers", "Content-Type");