使用junit和easymock编写测试代码：public boolean add(Bill bill) { boolean flag = false; Connection connection = null; try { connection = BaseDao.getConnection();//获得连接 connection.setAutoCommit(false);//开启JDBC事务管理 int updateRows = billDao.add(connection,bill); connection.commit(); if(updateRows > 0){ flag = true; System.out.println("add success!"); }else{ System.out.println("add failed!"); } } catch (Exception e) { e.printStackTrace(); try { System.out.println("rollback=================="); connection.rollback();//失败就回滚 } catch (SQLException e1) { e1.printStackTrace(); } }finally{ //在service层进行connection连接的关闭 BaseDao.closeResource(connection, null, null); } return flag; }

以下是使用junit和easymock编写测试代码的示例：

import org.easymock.EasyMock;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.sql.Connection;

public class BillServiceTest {
    private BillDao billDao;
    private BillService billService;

    @Before
    public void setUp() {
        billDao = EasyMock.createMock(BillDao.class);
        billService = new BillService(billDao);
    }

    @Test
    public void testAddBill() throws Exception {
        Connection connection = EasyMock.createMock(Connection.class);
        Bill bill = new Bill();
        EasyMock.expect(billDao.add(connection, bill)).andReturn(1);
        EasyMock.expectLastCall().once();
        EasyMock.expect(connection.getAutoCommit()).andReturn(false);
        EasyMock.expectLastCall().once();
        connection.commit();
        EasyMock.expectLastCall().once();
        EasyMock.expect(connection.getAutoCommit()).andReturn(true);
        EasyMock.expectLastCall().once();
        connection.close();
        EasyMock.expectLastCall().once();
        EasyMock.replay(billDao, connection);

        boolean result = billService.addBill(connection, bill);
        Assert.assertTrue(result);

        EasyMock.verify(billDao, connection);
    }
}

在这个例子中，我们使用EasyMock框架来模拟Connection和BillDao的对象，然后设置模拟对象的行为。在测试方法中，我们首先创建Connection和Bill对象，然后使用EasyMock.expect()来设置模拟对象的行为。最后，我们调用EasyMock.replay()来准备模拟对象，然后调用被测试的方法并进行断言。最后，我们调用EasyMock.verify()来验证模拟对象的行为是否符合预期。