（1）（考察知识点DBCP数据源） 应用DBCP数据源，实现获取数据库连接对象的功能，并实现增删改查任务代码的编写。 （2）（考察知识点Druid数据源） 使用Druid数据源，实现获取数据库连接对象的功能，并实现增删改查任务代码的编写。 代码：

以下是您需要的代码实现：

使用DBCP数据源：

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class DBCPExample {

    // 获取数据库连接对象
    public static Connection getConnection() throws SQLException, NamingException {
        Context context = new InitialContext();
        DataSource dataSource = (DataSource) context.lookup("java:comp/env/jdbc/testdb");
        Connection connection = dataSource.getConnection();
        return connection;
    }

    // 实现增删改查操作
    public static void insert() throws SQLException, NamingException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "insert into user(id, name) values(?, ?)";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1, 1);
            preparedStatement.setString(2, "张三");
            int result = preparedStatement.executeUpdate();
            System.out.println("插入成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void delete() throws SQLException, NamingException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "delete from user where id = ?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1, 1);
            int result = preparedStatement.executeUpdate();
            System.out.println("删除成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void update() throws SQLException, NamingException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "update user set name = ? where id = ?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, "李四");
            preparedStatement.setInt(2, 1);
            int result = preparedStatement.executeUpdate();
            System.out.println("更新成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void select() throws SQLException, NamingException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            connection = getConnection();
            String sql = "select * from user";
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                System.out.println("id：" + id + "，name：" + name);
            }
        } finally {
            if (resultSet != null) {
                resultSet.close();
            }
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

}

使用Druid数据源：

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;

public class DruidExample {

    private static DataSource dataSource;

    static {
        try {
            Context context = new InitialContext();
            dataSource = (DataSource) context.lookup("java:comp/env/jdbc/testdb");
            // 或者使用以下方式获取数据源
            // Properties properties = new Properties();
            // InputStream inputStream = DruidExample.class.getClassLoader().getResourceAsStream("druid.properties");
            // properties.load(inputStream);
            // dataSource = DruidDataSourceFactory.createDataSource(properties);
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }

    // 获取数据库连接对象
    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    // 实现增删改查操作
    public static void insert() throws SQLException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "insert into user(id, name) values(?, ?)";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1, 1);
            preparedStatement.setString(2, "张三");
            int result = preparedStatement.executeUpdate();
            System.out.println("插入成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void delete() throws SQLException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "delete from user where id = ?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1, 1);
            int result = preparedStatement.executeUpdate();
            System.out.println("删除成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void update() throws SQLException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {
            connection = getConnection();
            String sql = "update user set name = ? where id = ?";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, "李四");
            preparedStatement.setInt(2, 1);
            int result = preparedStatement.executeUpdate();
            System.out.println("更新成功：" + result);
        } finally {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

    public static void select() throws SQLException {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            connection = getConnection();
            String sql = "select * from user";
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                System.out.println("id：" + id + "，name：" + name);
            }
        } finally {
            if (resultSet != null) {
                resultSet.close();
            }
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        }
    }

}

请将以上代码保存在对应的Java文件中，并将DBCP和Druid相关配置文件（如context.xml和druid.properties）配置好后，部署到Tomcat服务器中。调用相应的方法，即可实现增删改查操作。