写出数据表是flower的web模块中flowerservlet实现增删改差的关键代码
时间: 2024-04-15 16:28:24 浏览: 15
在flower的web模块中,FlowerServlet可以实现增删改查的功能,以下是关键代码示例:
```java
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class FlowerServlet extends HttpServlet {
private FlowerDao flowerDao; // 数据库操作类
public void init() {
flowerDao = new FlowerDao(); // 初始化数据库操作类
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
String action = request.getParameter("action");
if (action != null) {
switch (action) {
case "add":
addFlower(request, response);
break;
case "delete":
deleteFlower(request, response);
break;
case "update":
updateFlower(request, response);
break;
case "query":
queryFlower(request, response);
break;
default:
response.getWriter().println("Invalid action");
break;
}
} else {
response.getWriter().println("No action specified");
}
}
private void addFlower(HttpServletRequest request, HttpServletResponse response) throws IOException {
String name = request.getParameter("name");
String color = request.getParameter("color");
Flower flower = new Flower(name, color);
flowerDao.addFlower(flower);
response.getWriter().println("Flower added successfully");
}
private void deleteFlower(HttpServletRequest request, HttpServletResponse response) throws IOException {
int id = Integer.parseInt(request.getParameter("id"));
flowerDao.deleteFlower(id);
response.getWriter().println("Flower deleted successfully");
}
private void updateFlower(HttpServletRequest request, HttpServletResponse response) throws IOException {
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
String color = request.getParameter("color");
Flower flower = new Flower(id, name, color);
flowerDao.updateFlower(flower);
response.getWriter().println("Flower updated successfully");
}
private void queryFlower(HttpServletRequest request, HttpServletResponse response) throws IOException {
int id = Integer.parseInt(request.getParameter("id"));
Flower flower = flowerDao.getFlower(id);
if (flower != null) {
response.getWriter().println(flower.toString());
} else {
response.getWriter().println("Flower not found");
}
}
}
```
上述代码是一个简单的FlowerServlet类,通过GET请求中的action参数来判断要执行的操作,然后调用相应的方法进行增删改查操作。其中,FlowerDao是数据库操作类,根据具体需求进行实现。在示例代码中,addFlower方法用于添加一朵花,deleteFlower方法用于删除一朵花,updateFlower方法用于更新一朵花的信息,queryFlower方法用于查询一朵花的信息。
请根据你的具体需求,修改代码中的参数和方法实现。
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