下面是存在问题的代码片段，分别是表单和Servlet,不知道为什么post提交的参数获取为null,方法为get时，可以正常获取到。我之前用过这样的方法，黑马那边讲的，之前类似这样的操作还可以正常获取到值，但是现在不知道为啥这个方法获取不到post提交的参数的键对应的值。
package com.jgdabc.web;
import com.jgdabc.pojo.Brand;
import com.jgdabc.service.BrandService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
private BrandService service = new BrandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, IOException {
//接收表单提交的数据，封装为brand对象
// 处理乱码问题
request.setCharacterEncoding("utf-8");
String brandName = request.getParameter("brandName");
String companyName = request.getParameter("companyName");
String ordered = request.getParameter("ordered");
String description = request.getParameter("description");
String status = request.getParameter("status");
//封装为一个Brand对象
Brand brand = new Brand();
brand.setBrandName(brandName);
brand.setCompanyName(companyName);
brand.setOrdered(Integer.parseInt(ordered));
brand.setDescription(description);
brand.setStatus(Integer.parseInt(status));
service.add(brand);
// 转发到查询所有Servlet
request.getRequestDispatcher("/selectAllServlet").forward(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
<%--
Created by IntelliJ IDEA.
User: jgdabc
Date: 2022/5/11
Time: 17:33
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>添加品牌</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/brand-demo/addServlet" method="post">
品牌名称：<input name="brandName"><br>
企业名称：<input name="companyName"><br>
排序：<input name="ordered"><br>
描述信息：<textarea rows="5" cols="20" name="description"></textarea><br>
状态：
<input type="radio" name="status" value="0">禁用
<input type="radio" name="status" value="1">启用<br>
<input type="submit" value="提交">
</form>
</body>
</html>
