Java Web应用中处理同名表单字段多值提交：完整指南

<input type="text" name="fruit" value="Apple">
<input type="text" name="fruit" value="Banana">
<input type="text" name="fruit" value="Orange">

<!-- myForm.jsp 或 myForm.html -->
<form action="processFruits" method="post">
  <table id="myTable" class="table table-bordered">
    <tbody>
      <tr>
        <td><input type="text" name="fruit" value="Apple"></td>
      </tr>
      <tr>
        <td><input type="text" name="fruit" value="Banana"></td>
      </tr>
      <tr>
        <td><input type="text" name="fruit" value="Orange"></td>
      </tr>
      <!-- 更多由后端数据动态生成的输入框 -->
    </tbody>
  </table>
  <button type="submit">提交水果</button>
</form>

import org.json.JSONArray;
import org.json.JSONObject;
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 java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration; // 导入Enumeration，用于获取所有参数名

@WebServlet("/processFruits")
public class FruitProcessorServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/json;charset=UTF-8");
        PrintWriter out = response.getWriter();

        // 1. 使用 request.getParameterValues() 获取所有 "fruit" 参数的值
        String[] fruits = request.getParameterValues("fruit");

        // 2. 创建一个 JSONArray 来存储处理后的数据
        JSONArray outputJsonArray = new JSONArray();

        // 3. 遍历获取到的水果值，并封装成 JSONObject 添加到 JSONArray
        if (fruits != null && fruits.length > 0) {
            for (String fruitName : fruits) {
                if (fruitName != null && !fruitName.trim().isEmpty()) { // 简单校验空值
                    JSONObject fruitObject = new JSONObject();
                    fruitObject.put("fruit", fruitName.trim()); // trim() 去除前后空白
                    outputJsonArray.put(fruitObject); // 将 JSONObject 添加到 JSONArray
                }
            }
        } else {
            // 如果没有提交任何水果值
            System.out.println("没有提交任何水果值。");
        }

        // 4. 打印或返回生成的 JSONArray
        System.out.println("处理后的水果数据: " + outputJsonArray.toString());
        out.print(outputJsonArray.toString());
        out.flush();
    }

    // 为了完整性，也可以处理GET请求，尽管本例主要关注POST
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<h1>请通过POST请求提交数据。</h1>");
        out.flush();
    }
}

[
  {"fruit":"Apple"},
  {"fruit":"Banana"},
  {"fruit":"Orange"}
]