先在接口方法中添加相应接口方法：
//添加新产品
@Insert("insert into db.brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
void addBrand(brand brand);在service中添加对应的方法：
public void addBrand(brand brand){
String resource = "mybatis-config.xml";
InputStream inputStream = null;
inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
brandMapper brandMapper = sqlSession.getMapper(brandMapper.class);
brandMapper.addBrand(brand);
sqlSession.commit();
sqlSession.close();
}然后开始写添加新产品的信息jsp
<%--
Created by IntelliJ IDEA.
User: quwenhao
Date: 2023/12/28
Time: 19:27
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>添加品牌</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/brandAddService" 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>
完成后设置表单提交给添加的servlet，下面开始写添加的servlet
package org.example.web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
import org.example.service.brandService;
import org.example.pojo.brand;
@WebServlet("/brandAddService")
public class brandAddService extends HttpServlet {
private brandService brandService=new brandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//处理post类型乱码问题
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");
//封装成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));
//调用Service添加方法
brandService.addBrand(brand);
//转发到查询所有
request.getRequestDispatcher("/brandSelectAllService").forward(request,response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}在brand.jsp中我们通过设置了新增按钮来添加信息，<input type="button" value="新增" id="addBrand"><br>。我们可以运用javaScript获取其id为其添加跳转功能
在body标签末尾添加下面代码，添加跳转功能。
<script>
document.getElementById("addBrand").onclick=function (){
location.href="/addBrand.jsp";
}
</script>下面是修改操作：想对特定某条信息进行修改，需要先根据id查询到特定的信息，然后在进行修改。
接口方法：
//根据id查询
@Select("select * from db.brand where id=#{id}")
@ResultMap("brandResultMap")
brand selectByIdBrand(int id);
//根据id，修改特定的产品的信息
@Update("update db.brand set brand_Name=#{brandName},company_name=#{companyName},ordered=#{ordered},description=#{description},status=#{status} where id=#{id}")
void update(brand brand);
service：
public brand brandSelectById(int id){
String resource = "mybatis-config.xml";
InputStream inputStream = null;
inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
brandMapper brandMapper = sqlSession.getMapper(brandMapper.class);
brand brand = brandMapper.selectByIdBrand(id);
sqlSession.close();
return brand;
}
public void Update(brand brand){
String resource = "mybatis-config.xml";
InputStream inputStream = null;
inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
brandMapper brandMapper = sqlSession.getMapper(brandMapper.class);
brandMapper.update(brand);
sqlSession.commit();
sqlSession.close();
}然后写根据id查询到的特定产品的详细信息的jsp：
<%--
Created by IntelliJ IDEA.
User: quwenhao
Date: 2023/12/28
Time: 20:15
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<html>
<head>
<title>修改品牌</title>
</head>
<body>
<h3>修改品牌</h3>
<form action="/updateServlet" method="post">
<%-- 隐藏域，提交id--%>
<input type="hidden" name="id" value="${brand.id}">
品牌名称：<input name="brandName" value="${brand.brandName}"><br>
企业名称：<input name="companyName" value="${brand.companyName}"><br>
排序：<input name="ordered" value="${brand.ordered}"><br>
描述信息：<textarea rows="5" cols="20" name="description">${brand.description}</textarea><br>
状态：
<c:if test="${brand.status==0}">
<input type="radio" name="status" value="0" checked>禁用
<input type="radio" name="status" value="1">启用<br>
</c:if>
<c:if test="${brand.status==1}">
<input type="radio" name="status" value="0">禁用
<input type="radio" name="status" value="1" checked>启用<br>
</c:if>
<input type="submit" value="提交">
</form>
</body>
</html>
然后写的是特定产品的详细信息的Servlet：
package org.example.web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
import org.example.pojo.brand;
import org.example.service.brandService;
@WebServlet("/selectByIdService")
public class selectByIdService extends HttpServlet {
private brandService brandService=new brandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.接收id
String id = request.getParameter("id");
//2.service查询
brand brand = brandService.brandSelectById(Integer.parseInt(id));
//3.存储到request中
request.setAttribute("brand",brand);
//4.转发
request.getRequestDispatcher("/selectById.jsp").forward(request,response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}我们想调用该servlet根据id查询详细信息，需要先知道该信息的id，所以在跳转到该servlet时应把id传过来。所以brand.jsp中修改信息的跳转链接应该这样写，将#改为下面的链接。
<td><a href="/selectByIdService?id=${brand.id}">修改</a>这样我们在打开修改页面的时候，该产品原本的信息会自动填写在文本框中。
修改信息完后，会将该表单提交到updateServlet中，执行修改操作：
package org.example.web;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
import org.example.pojo.brand;
import org.example.service.brandService;
@WebServlet("/updateServlet")
public class updateServlet extends HttpServlet {
brandService brandService=new brandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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");
String id=request.getParameter("id");
brand brand=new brand();
brand.setBrandName(brandName);
brand.setCompanyName(companyName);
brand.setOrdered(Integer.parseInt(ordered));
brand.setDescription(description);
brand.setStatus(Integer.parseInt(status));
brand.setId(Integer.parseInt(id));
brandService.Update(brand);
request.getRequestDispatcher("/brandSelectAllService").forward(request,response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}这样就可以完成修改操作了