js map到servlet

// 创建一个新的Map对象
let dataMap = new Map();

// 假设用户输入了一些数据
dataMap.set('name', 'Alice');
dataMap.set('age', 30);

// 将Map转换为JSON字符串
let jsonData = JSON.stringify(Array.from(dataMap.entries()));

// 发送数据到Servlet
fetch('/processData', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: jsonData
}).then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

import java.io.BufferedReader;
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 com.google.gson.Gson;
import java.util.Map;

@WebServlet("/processData")
public class DataProcessorServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = request.getReader();
        String line;
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        
        // 将JSON字符串转换为Map对象
        Gson gson = new Gson();
        Map<String, Object> dataMap = gson.fromJson(sb.toString(), Map.class);
        
        // 处理数据...
        String name = (String) dataMap.get("name");
        int age = ((Double) dataMap.get("age")).intValue();
        
        // 返回处理结果
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write("{\"status\":\"success\", \"message\":\"Data processed\"}");
    }
}