Spring实例--XML配置实现
本实例是主要是通过Spring实现数据库的CRUD操作。
以下是主要使用到的jar包的maven坐标
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.2.1.RELEASEversion>
dependency>
<dependency>
<groupId>commons-dbutilsgroupId>
<artifactId>commons-dbutilsartifactId>
<version>1.7version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.18version>
dependency>
<dependency>
<groupId>c3p0groupId>
<artifactId>c3p0artifactId>
<version>0.9.1.2version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
创建实例数据表
create table account(
id int primary key auto_increment,
name varchar(40),
money float
)character set utf8 collate utf8_general_ci;
insert into account(name,money) values('熊大',5000);
insert into account(name,money) values('熊二',5000);
insert into account(name,money) values('光头强',1000);
编写持久层接口及其实现类
/**
* 账户的持久层接口
*/
public interface AccountDao {
/**
* 查询所有账户
* @return
*/
public List<Account> findAllAccount();
/**
*通过账户id查询账户
* @param accountId
* @return
*/
public Account findAccountById(int accountId);
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 更新账户信息
*/
public void updateAccount(Account account);
/**
* 通过账户id删除账户
* @param accountId
*/
public void deleteAccount(int accountId);
}
/**
* 账户持久层接口的实现类
*/
public class AccountDaoImpl implements AccountDao {
//提供对sql语句操作的API
private QueryRunner queryRunner;
public void setQueryRunner(QueryRunner queryRunner) {
this.queryRunner = queryRunner;
}
public List<Account> findAllAccount() {
try {
return queryRunner.query("select *from account",new BeanListHandler<Account>(Account.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public Account findAccountById(int accountId) {
try {
return queryRunner.query("select *from account where id = ?", new BeanHandler<Account>(Account.class), accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void saveAccount(Account account ) {
try {
queryRunner.update("insert into account(name,money) value(?,?)",account.getName(),account.getMoney());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void updateAccount(Account account) {
try {
queryRunner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void deleteAccount(int accountId) {
try {
queryRunner.update("delete from account where id=?",accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
编写业务层接口及其实现类
/**
* 账户业务层接口
*/
public interface AccountService {
/**
* 查询所有账户
* @return
*/
public List<Account> findAllAccount();
/**
*通过账户id查询账户
* @param accountId
* @return
*/
public Account findAccountById(int accountId);
/**
* 保存账户
*/
void saveAccount(Account account);
/**
* 更新账户信息
*/
public void updateAccount(Account account);
/**
* 通过账户id删除账户
* @param accountId
*/
public void deleteAccount(int accountId);
}
public class AccountServiceImpl implements AccountService {
private AccountDao accountDao;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public List<Account> findAllAccount() {
return accountDao.findAllAccount();
}
public Account findAccountById(int accountId) {
return accountDao.findAccountById(accountId);
}
public void saveAccount(Account account) {
accountDao.saveAccount(account);
}
public void updateAccount(Account account) {
accountDao.updateAccount(account);
}
public void deleteAccount(int accountId) {
accountDao.deleteAccount(accountId);
}
}
编写XML配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="accountService" class="com.liang.service.impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"></property>
</bean>
<bean id="accountDao" class="com.liang.dao.impl.AccountDaoImpl">
<property name="queryRunner" ref="queryRunner"></property>
</bean>
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mySpring?serverTimezone=UTC"></property>
<property name="user" value="root"></property>
<property name="password" value="liang"></property>
</bean>
</beans>
编写测试类
public class SpringTest {
private AccountService accountService;
@Before
public void init()
{
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
accountService = (AccountService)applicationContext.getBean("accountService");
System.out.println(accountService);
}
@Test
public void testFindAllAccount()
{
List<Account> accounts = accountService.findAllAccount();
for (Account account:accounts)
{
System.out.println(account);
}
}
@Test
public void testFindAccountById()
{
Account account = accountService.findAccountById(1);
System.out.println(account);
}
@Test
public void testSaveAccount()
{
Account account = new Account();
account.setName("灰太狼");
account.setMoney(0.01f);
accountService.saveAccount(account);
}
@Test
public void testUpdateAccount()
{
Account account = accountService.findAccountById(4);
account.setMoney(0.001f);
accountService.updateAccount(account);
}
@Test
public void testDeleteAccount()
{
accountService.deleteAccount(4);
}
}