怎么做科技小制作视频网站重庆seo务
目录
一、xml方式实现
1.介绍lombok插件
2.功能
3.步骤
3.1 idea安装插件(只做一次)
3.2 添加坐标
3.3 编写注解
4.核心类
4.1 QueryRunner
4.2 query() 查询
4.3 update() 增删改
5.配置文件applicationContext.xml
6.junit测试
6.1使用步骤
6.1.1 坐标
6.1.2 注解(修饰方法)
二、annotation注解方式实现
1.控制层(cotroller)
2.业务层(service)
3.数据访问层(dao)
4.配置文件applicationContext.xml
三、configuration配置类方式实现
1.ApplicationConfig
2.DataConfig 替换applicationContext.xml
3.测试类
四、在xml基础上实现转账业务
1.同一个业务方法的多个dao方法公用一个connection对象
2.ThreadLocal
3.通过连接对象进行事务的统一管理
5.项目总结：
一、xml方式实现
1.介绍lombok插件
dbUtil-阿帕奇提供操作数据库的插件
2.功能
对实体类自动，动态生成getset，无参有参 toString.....
3.步骤
3.1 idea安装插件(只做一次)
3.2 添加坐标
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.26</version>
</dependency>3.3 编写注解
@NoArgsConstructor
@AllArgsConstructor
@Data
public class Account implements Serializable {private int aid;private String aname;private int amoney;public Account(String aname, int amoney) {this.aname = aname;this.amoney = amoney;}
}4.核心类
4.1 QueryRunner
//操作数据库的核心类QueryRunner queryRunner;public void setQueryRunner(QueryRunner queryRunner) {this.queryRunner = queryRunner;}
4.2 query() 查询
@Overridepublic void save(Account account) {try {queryRunner.update("insert into account(aname,amoney) value(?,?)",account.getAname(),account.getAmoney());} catch (SQLException throwables) {throwables.printStackTrace();}}
@Override
public void updateById(Account account) {try {queryRunner.update("udpate account set aname=?,amoney=? where aid=?",account.getAname(),account.getAmoney(),account.getAid());} catch (SQLException throwables) {throwables.printStackTrace();}
}@Override
public void deleteById(int id) {try {queryRunner.update("delete from account where aid=?",id);} catch (SQLException throwables) {throwables.printStackTrace();}
}4.3 update() 增删改
@Override
public Account findByName(String name) {try {return queryRunner.query("select * from account where aname=?",new BeanHandler<Account>(Account.class),name);} catch (SQLException throwables) {throwables.printStackTrace();}return null;
}@Override
public List<Account> findAll() {try {return queryRunner.query("select * from account",new BeanListHandler<Account>(Account.class));} catch (SQLException throwables) {throwables.printStackTrace();}return null;
}
5.配置文件applicationContext.xml
<!--加载资源文件--><context:property-placeholder location="jdbc.properties"></context:property-placeholder><!--注入数据源--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${msg1}"></property><property name="jdbcUrl" value="${msg2}"></property><property name="user" value="${msg3}"></property><property name="password" value="${msg4}"></property></bean><!--注入QueryRunner--><bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner"><constructor-arg name="ds" ref="dataSource"></constructor-arg></bean><!--注入dao--><bean id="mapperImp" class="com.ztt.dao.AccountMapperImp"><property name="queryRunner" ref="queryRunner"></property></bean><!--注入service--><bean id="service" class="com.ztt.service.AccountServiceImp"><property name="mapper" ref="mapperImp"></property></bean><!--注入controller--><bean id="controller" class="com.ztt.controller.AccountControllerImp"><property name="service" ref="service"></property></bean>6.junit测试
6.1使用步骤
6.1.1 坐标
<!--单元测试-->
<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope>
</dependency>
<!--数据源--><dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>0.9.1.2</version>
</dependency>6.1.2 注解(修饰方法)
@Test======>可以运行的方法
@Before====>@Test运行之前
@After=====>@Test运行之后
方式一：
public class Test01 {ClassPathXmlApplicationContext applicationContext =null;IAccountController controller = null;@Beforepublic void beforeMethod(){applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");controller = (IAccountController) applicationContext.getBean("controller");}@Afterpublic void afterMethod(){applicationContext.close();}@Testpublic void show1(){controller.save(new Account("张甜甜",2000));controller.save(new Account("许娜",2000));}@Testpublic void show2(){List<Account> all = controller.findAll();for (int i = 0; i < all.size(); i++) {Account account = all.get(i);System.out.println(account);}}}
方式二：
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class Test02 {@AutowiredIAccountController controller;@Testpublic void show1(){controller.save(new Account("张甜甜",2000));controller.save(new Account("许娜",2000));}@Testpublic void show2(){List<Account> all = controller.findAll();for (int i = 0; i < all.size(); i++) {Account account = all.get(i);System.out.println(account);}}@Testpublic void show3(){controller.transfer("张甜甜","许娜",100);}
}
二、annotation注解方式实现
1.控制层(cotroller)
@Controller("controller")
public class AccountControllerImp implements IAccountController {@AutowiredIAccountService service;2.业务层(service)
@Service
public class AccountServiceImp implements IAccountService{@AutowiredIAccountMapper mapper;3.数据访问层(dao)
@Repository
public class AccountMapperImp implements IAccountMapper{//操作数据库的核心类@AutowiredQueryRunner queryRunner;4.配置文件applicationContext.xml
<!--加载资源文件--><context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder><!--注入数据源--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${msg1}"></property><property name="jdbcUrl" value="${msg2}"></property><property name="user" value="${msg3}"></property><property name="password" value="${msg4}"></property></bean><!--注入QueryRunner--><bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner"><constructor-arg name="ds" ref="dataSource"></constructor-arg></bean><!--扫描--><context:component-scan base-package="com.ztt"></context:component-scan>测试类同上
三、configuration配置类方式实现
在三层框架的基础上新建一个包config,用来写配置类
1.ApplicationConfig
@Configuration
@ComponentScan(basePackages = "com.ztt")
@Import(DataConfig.class)
public class ApplicationConfig {
}2.DataConfig 替换applicationContext.xml
@Configuration
@PropertySource(value = "classpath:jdbc.properties")
public class DataConfig {@Value("${msg1}")private String driverClass;@Value("${msg2}")private String jdbcUrl;@Value("${msg3}")private String user;@Value("${msg4}")private String password;// <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
// <property name="driverClass" value="${msg1}"></property>
// <property name="jdbcUrl" value="${msg2}"></property>
// <property name="user" value="${msg3}"></property>
// <property name="password" value="${msg4}"></property>
// </bean>@Beanpublic DataSource dataSource(){try {ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();comboPooledDataSource.setDriverClass(driverClass);comboPooledDataSource.setJdbcUrl(jdbcUrl);comboPooledDataSource.setUser(user);comboPooledDataSource.setPassword(password);return comboPooledDataSource;} catch (PropertyVetoException e) {e.printStackTrace();}return null;}// <bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner">
// <constructor-arg name="ds" ref="dataSource"></constructor-arg>
// </bean>@Beanpublic QueryRunner queryRunner(){return new QueryRunner(dataSource());}}
3.测试类
四、在xml基础上实现转账业务
目的：业务层进行事务管理
1.同一个业务方法的多个dao方法公用一个connection对象
2.ThreadLocal
3.通过连接对象进行事务的统一管理
ConnectionUtil连接工具类：
public class ConnectionUtil {//装配数据源DataSource dataSource;public void setDataSource(DataSource dataSource) {this.dataSource = dataSource;}//线程区域对象ThreadLocal<Connection> threadLocal=new ThreadLocal<Connection>();//获取连接public Connection createCon(){Connection connection = null;try {//1.获取线程内的连接对象connection=threadLocal.get();//2.判断if(connection==null){connection=dataSource.getConnection();//创建连接threadLocal.set(connection);//保存}return connection;} catch (SQLException throwables) {throwables.printStackTrace();}return connection;}//移除连接public void removeCon(){threadLocal.remove();//移除连接}}
TransactionUtil事务管理工具类：
public class TransactionUtil {//注入连接工具类ConnectionUtil connectionUtil;public void setConnectionUtil(ConnectionUtil connectionUtil) {this.connectionUtil = connectionUtil;}//开启事务public void beginTx(){try {connectionUtil.createCon().setAutoCommit(false);} catch (SQLException throwables) {throwables.printStackTrace();}}//提交事务public void commitTx(){try {connectionUtil.createCon().commit();} catch (SQLException throwables) {throwables.printStackTrace();}}//回滚事务public void rollbackTx(){try {connectionUtil.createCon().rollback();} catch (SQLException throwables) {throwables.printStackTrace();}}//关闭事务public void closeTx(){try {connectionUtil.createCon().close();//关闭事务connectionUtil.removeCon();//移除事务} catch (SQLException throwables) {throwables.printStackTrace();}}
}
AccountMapperImp：
public class AccountMapperImp implements IAccountMapper{//操作数据库的核心类QueryRunner queryRunner;public void setQueryRunner(QueryRunner queryRunner) {this.queryRunner = queryRunner;}//注入连接工具ConnectionUtil connectionUtil;public void setConnectionUtil(ConnectionUtil connectionUtil) {this.connectionUtil = connectionUtil;}
AccountServiceImp：
public class AccountServiceImp implements IAccountService{IAccountMapper mapper;public void setMapper(IAccountMapper mapper) {this.mapper = mapper;}//装配TransactionUtil transactionUtil;public void setTransactionUtil(TransactionUtil transactionUtil) {this.transactionUtil = transactionUtil;}@Overridepublic void transfer(String sourceName, String targetName, int money) {try {transactionUtil.beginTx();//1.查询数据Account sourceAccount = mapper.findByName(sourceName);Account targetAccount = mapper.findByName(sourceName);//2.转账sourceAccount.setAmoney(sourceAccount.getAmoney()-money);targetAccount.setAmoney(targetAccount.getAmoney()+money);//3.修改数据库mapper.updateById(sourceAccount);int a=10/0;//模拟异常mapper.updateById(targetAccount);transactionUtil.commitTx();} catch (Exception e) {e.printStackTrace();transactionUtil.rollbackTx();} finally {transactionUtil.closeTx();}}AccountControllerImp：
public class AccountControllerImp implements IAccountController {IAccountService service;public void setService(IAccountService service) {this.service = service;}@Overridepublic void transfer(String sourceName, String targetName, int money) {service.transfer(sourceName,targetName,money);}public void save(Account account) {service.save(account);}配置文件applicationContext.xml
在原有的基础上注入连接工具类、事务工具类、以及在业务层注入事务管理工具类
<!--连接工具类-->
<bean id="connectionUtil" class="com.ztt.util.ConnectionUtil">
<property name="dataSource" ref="dataSource"></property>
</bean><!--事务工具类-->
<bean id="transactionUtil" class="com.ztt.util.TransactionUtil">
<property name="connectionUtil" ref="connectionUtil"></property>
</bean><!--注入dao-->
<bean id="mapperImp" class="com.ztt.dao.AccountMapperImp">
<property name="queryRunner" ref="queryRunner"></property>
</bean><!--注入service-->
<bean id="service" class="com.ztt.service.AccountServiceImp">
<property name="mapper" ref="mapperImp"></property>
<property name="transactionUtil" ref="transactionUtil"></property>
</bean><!--注入controller-->
<bean id="controller" class="com.ztt.controller.AccountControllerImp">
<property name="service" ref="service"></property>
</bean>测试方法：
@Testpublic void show3(){controller.transfer("张甜甜","许娜",100);}5.项目总结：
1.事务管理应该由service层进行实现
代码优化：
目的：业务层进行事务管理
1.同一个业务方法的多个dao方法公用一个connection对象
2.ThreadLocal
3.通过连接对象进行事务的统一管理