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版权声明

• 本文原创作者：谷哥的小弟
• 作者博客地址：http://blog.csdn.net/lfdfhl

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在本节教程中，我们实现删除学生的功能。当在学生列表中点击删除后即可删除某位学生并重新加载学生列表。所以，该操作实际包含两步：

• 1、删除学生
• 2、刷新学生列表

DeleteStudentServlet

请在servlet包下创建DeleteStudentServlet实现删除学生的功能，代码如下：

package com.cn.servlet;

import com.cn.util.C3P0Utils;
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.sql.Connection;
import java.sql.PreparedStatement;

@WebServlet(name = "DeleteStudentServlet", urlPatterns = "/DeleteStudentServlet")
public class DeleteStudentServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int id = Integer.parseInt(request.getParameter("id"));
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = C3P0Utils.getConnection();
            String sql = "delete from student where id=?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1, id);
            int result = preparedStatement.executeUpdate();
            if (result > 0){
                System.out.println("success");
            } else{
                System.out.println("error");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            C3P0Utils.release(connection, preparedStatement, null);
        }
        String contextPath = request.getContextPath();
        response.sendRedirect( contextPath+"/ShowStudentServlet");
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

图示如下：