整個Spring黑馬父類pom.xml配置
< modules>標籤裏是子類
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.jh</groupId>
<artifactId>Spring_黑馬</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>Spring_Bean解耦</module>
<module>SpringIOC</module>
<module>SpringBean</module>
<module>Spring依賴</module>
<module>Spring註解</module>
<module>SpringIOC_XML</module>
<module>SpringIOC註解案例</module>
<module>Spring新註解(無xml)</module>
</modules>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.18</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
1. bean.xml配置(關鍵)
下面的是層層遞進調用,通過ref屬性層層調用
(1)配置Service層
(2)配置Dao層
(3)配置QueryRunner對象
(4)配置數據源
<?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
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--配置Service層-->
<bean id="accountService" class="com.jh.service.impl.AccountServiceImpl">
<!--注入dao-->
<property name="accountDao" ref="accountDao"></property>
</bean>
<!--配置Dao層-->
<bean id="accountDao" class="com.jh.dao.impl.AccountDaoImpl">
<!--注入QueryRunner對象-->
<property name="runner" ref="runner"></property>
</bean>
<!--配置QueryRunner對象-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<!--注入數據源-->
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
<!--配置數據源-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--連接數據庫的必備信息-->
<property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/maven?serverTimezone=GMT%2B8"></property>
<property name="user" value="root"></property>
<property name="password" value="jh7851192"></property>
</bean>
</beans>
2. dao層、domain層、service層、測試類
(1)dao層
IAccountDao接口
public interface IAccountDao {
//1. 查詢所有
List<Account> findAllAccount();
//2.查詢一個
Account findAccountById(Integer accountId);
//3.保存
void saveAccount(Account account);
//4.刪除操作
void deleteAccount(Integer accountId);
//5.更新操作
void updateAccount(Account account);
}
AccountDaoImpl實現類
- 這裏添加了QueryRunner對象;
- SQL語句在持久層實現類裏寫。
public class AccountDaoImpl implements IAccountDao {
private QueryRunner runner;
public QueryRunner getRunner() {
return runner;
}
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
@Override
public List<Account> findAllAccount() {
try {
//這裏是在Spring裏應用數據庫連接(sql語句查詢);
//Account.class是查詢的實體類關聯,這裏是List集合,用到BeanListHandler
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
@Override
public Account findAccountById(Integer accountId) {
try {
//Account.class是查詢的實體類關聯,這裏不是List集合,用BeanHandler
return runner.query("select * from account where id=?",
new BeanHandler<Account>(Account.class),accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
@Override
public void saveAccount(Account account) {
try {
//account表中id是自增長,故不需要寫
runner.update("insert into account(name,money)values(?,?)",
account.getName(),account.getMoney());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
@Override
public void deleteAccount(Integer accountId) {
try {
//問號佔位符填的是傳入參數值accountId
runner.update("delete from account where id=?",accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
@Override
public void updateAccount(Account account) {
try {
/*每個問號代表一個佔位符(1,2,3),後面的account.getName(),
account.getMoney(),account.getId(),按順序排列在前面的問號裏*/
runner.update("update account set name=?,money=? where id=?",
account.getName(),account.getMoney(),account.getId());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
(2)service層
IAccountService業務層接口
public interface IAccountService {
//1. 查詢所有
List<Account> findAllAccount();
//2.查詢一個
Account findAccountById(Integer accountId);
//3.保存
void saveAccount(Account account);
//4.刪除操作
void deleteAccount(Integer accountId);
//5.更新操作
void updateAccount(Account account);
}
AccountServiceImpl 業務層調用持久層
public class AccountServiceImpl implements IAccountService {
private IAccountDao accountDao;
public IAccountDao getAccountDao() {
return accountDao;
}
public void setAccountDao(IAccountDao accountDao) {
this.accountDao = accountDao;
}
public List<Account> findAllAccount() {
return accountDao.findAllAccount();
}
public Account findAccountById(Integer accountId) {
return accountDao.findAccountById(accountId);
}
public void saveAccount(Account account) {
accountDao.saveAccount(account);
}
public void deleteAccount(Integer accountId) {
accountDao.deleteAccount(accountId);
}
public void updateAccount(Account account) {
accountDao.updateAccount(account);
}
}
domain主體類
- 省略了set和get,toString方法
- 如果操作數據庫,則屬性名最好設置與(表)查詢字段表一致
package com.jh.domain;
import java.io.Serializable;
public class Account implements Serializable {
private Integer id;
private String name;
private Float money;
}
測試類
public class AccountServiceTest {
@Autowired
private ApplicationContext ac =null;
private IAccountService as = null;
@Before //省略這些重複步驟
public void init(){
//1.使用註解獲取容器
ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到業務層對象(bean對象),name的id要與bean.xml中id一樣accountService
as = ac.getBean("accountService",IAccountService.class);
}
@Test
public void testFindAll(){
//3.執行方法
List<Account> accounts=as.findAllAccount();
for (Account account:accounts){
System.out.println(account);
/*Account{id=1, name='aaa', money=1000.0}
Account{id=2, name='bbb', money=1000.0}
Account{id=3, name='ccc', money=1000.0}*/
}
}
@Test
public void testFindOne(){
//3.執行方法
System.out.println(as.findAccountById(2));
/*Account{id=2, name='bbb', money=1000.0}*/
}
@Test
public void testSave(){
Account account=new Account();
account.setName("郭會技");
account.setMoney(12782f);
//3.執行方法
as.saveAccount(account);
/*Account{id=5, name='郭會技', money=12782.0}*/
}
@Test
public void testUpdate(){
//3.執行方法
Account account=as.findAccountById(5);
account.setMoney(12213f);
account.setName("jh");
as.updateAccount(account);
}
@Test
public void testDelete(){
//3.執行方法
as.deleteAccount(4);
}
}