XML<packaging>war</packaging> <dependencies> <dependency> <groupId>jakarta.servlet</groupId> <artifactId>jakarta.servlet-api</artifactId> <version>6.0.0</version> </dependency> <dependency> <groupId>com.csdn</groupId> <artifactId>pro03-fruit-optimize</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies>
- pro03-fruit-optimize是我自己封装的一个jar包,功能是可以实现水果系统的增删改查
1、查询水果清单IndexServlet
javapackage com.csdn.fruit.servlet; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dao.impl.FruitDaoImpl; import com.csdn.fruit.pojo.Fruit; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.List; @WebServlet("/index") public class IndexServlet extends HttpServlet { private FruitDao fruitDao = new FruitDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { List<Fruit> fruitList = fruitDao.getFruitList(); fruitList.stream().forEach(System.out::println); } }
- 这里面的FruitDao水果数据访问对象接口,FruitDaoImpl水果数据访问对象实现类,都在pro03-fruit-optimize这个jar包里面
2、通过水果名查询水果EditServlet
javapackage com.csdn.fruit.servlet; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dao.impl.FruitDaoImpl; import com.csdn.fruit.pojo.Fruit; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/edit") public class EditServlet extends HttpServlet { FruitDao fruitDao = new FruitDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String fname = req.getParameter("fname"); Fruit fruit = fruitDao.getFruitByFname(fname); System.out.println(fruit); } }
3、 根据水果名修改库存量UpdateServlet
javapackage com.csdn.fruit.servlet; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dao.impl.FruitDaoImpl; import com.csdn.fruit.pojo.Fruit; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/update") public class UpdateServlet extends HttpServlet { private FruitDao fruitDao = new FruitDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //String fidStr = req.getParameter("fid"); //Integer fid = Integer.parseInt(fidStr); String fname = req.getParameter("fname"); //Integer price = Integer.parseInt(req.getParameter("price")); Integer fcount = Integer.parseInt(req.getParameter("fcount")); //String remark = req.getParameter("remark"); fruitDao.updateFruit(new Fruit(0,fname, 0, fcount, null)); System.out.println("修改成功"); } }
- 因为我底层也就是FruitDaoImpl写的就是通过水果名,修改水果的库存量,所以这里只能修改库存量fcount
String sql = "update t_fruit set fcount=? where fname = ?";
4、根据水果名删除水果记录DelServlet
javapackage com.csdn.fruit.servlet; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dao.impl.FruitDaoImpl; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/del") public class DelServlet extends HttpServlet { FruitDao fruitDao = new FruitDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String fname = req.getParameter("fname"); fruitDao.delFruit(fname); System.out.println("删除成功!"); } }
5、添加水果AddServlet
javapackage com.csdn.fruit.servlet; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dao.impl.FruitDaoImpl; import com.csdn.fruit.pojo.Fruit; import jakarta.servlet.ServletException; import jakarta.servlet.annotation.WebServlet; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/add") public class AddServlet extends HttpServlet { private FruitDao fruitDao = new FruitDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String fname = req.getParameter("fname"); Integer price = Integer.parseInt(req.getParameter("price")); Integer fcount = Integer.parseInt(req.getParameter("fcount")); String remark = req.getParameter("remark"); Fruit fruit = new Fruit(fname, price, fcount, remark); fruitDao.addFruit(fruit); System.out.println("添加成功!"); } }
- 注意:这里面的 Post 请求,要把 enctype 的值调成 x-www-form-urlencoded
使用Servlet修改水果库存系统,并使用PostMan测试Servlet请求
丁总学Java2023-11-04 16:03
相关推荐
星叔1 小时前
ARXML汽车可扩展标记性语言规范讲解2401_857600951 小时前
SpringBoot框架:共享汽车管理的创新工具代码小鑫1 小时前
A15基于Spring Boot的宠物爱心组织管理系统的设计与实现爱吃土豆的马铃薯ㅤㅤㅤㅤㅤㅤㅤㅤㅤ1 小时前
mapper.xml 使用大于号、小于号示例一直学习永不止步1 小时前
LeetCode题练习与总结:迷你语法分析器--385Tech Synapse2 小时前
Java将Boolean转为Json对象的方法小冉在学习2 小时前
day55 图论章节刷题Part07([53.寻宝]prim算法、kruskal算法)伴野星辰2 小时前
网站视频过大,加载缓慢解决方法【分段加载视频】让生命变得有价值2 小时前
k8s 启用 ValidatingAdmissionPolicy 特性morning_judger2 小时前
【设计模式系列】享元模式(十五)