无法从servlet Java在Ajax中记录Json响应？

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONObject;

@WebServlet("/ajaxServlet")
public class AjaxServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 设置响应的内容类型为application/json
        response.setContentType("application/json");
        
        // 创建Json对象并添加数据
        JSONObject json = new JSONObject();
        json.put("name", "John");
        json.put("age", 30);
        
        // 将Json对象转换为字符串形式
        String jsonString = json.toString();
        
        // 将Json字符串作为响应的内容写入输出流中
        response.getWriter().write(jsonString);
    }
}