下面我们来写一下基于XML的IOC案例
Maven工程
在src、main、java下新建com.itheima包,
建立一个service包,在包下新建一个接口IAccountService,
账户的业务层接口,方法都是查询所有、查询一个、保存、修改、删除。
package com.itheima.service;
import com.itheima.domain.Account;
import java.util.List;
//账户的业务层接口
public interface IAccountService {
//查询所有
List<Account> findAllAccount();
//查询一个
Account findAccountById(Integer accountId);
//保存
void saveAccount(Account account);
//修改
void updateAccount(Account account);
//删除
void deleteAccount(Integer accountId);
} 在com.itheima下新建一个包domain,在domain下新建一个类Account,账户实体类 对了,在这之前在mysql中已经创建了一个数据库
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('aaa',1000);
insert into account(name,money) values('bbb',1000);
insert into account(name,money) values('ccc',1000); package com.itheima.domain;
import java.io.Serializable;
/**
* 账户的实体类
*/
public class Account implements Serializable {
private Integer id;
private String name;
private Float money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Float getMoney() {
return money;
}
public void setMoney(Float money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
在com.itheima下新建一个包dao,在dao下有一个接口IAccountDao,
package com.itheima.dao;
import com.itheima.domain.Account;
import java.util.List;
// 账户的持久层接口
public interface IAccountDao {
//查询所有
List<Account> findAllAccount();
//查询一个
Account findAccountById(Integer accountId);
//保存
void saveAccount(Account account);
//修改
void updateAccount(Account account);
//删除
void deleteAccount(Integer accountId);
} 我们的持久层技术选型是dbutils。 我们在dao包下新建一个包impl,在impl下新建AccountDaoImpl,
在service层下新建一个类impl.AccountServiceImpl,
package com.itheima.dao.impl;
import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import java.util.List;
public class AccountDaoImpl implements IAccountDao {
private QueryRunner runner;
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
public List<Account> findAllAccount() {
try {
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
}catch (Exception e) {
throw new RuntimeException(e);
}
}
public Account findAccountById(Integer accountId) {
try {
return runner.query("select * from account where id = ?",new BeanHandler<Account>(Account.class),accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
}
public void saveAccount(Account account) {
try {
runner.update("insert into account(name,money) values(?,?)",account.getName(),account.getMoney());
}catch (Exception e) {
throw new RuntimeException(e);
}
}
public void updateAccount(Account account) {
try {
runner.update("update account set name=?,money=? where id = ?",account.getName(),account.getMoney(),account.getId());
}catch (Exception e) {
throw new RuntimeException(e);
}
}
public void deleteAccount(Integer accountId) {
try {
runner.update("delete from account where id = ?",accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
}
} 在service层下新建一个类impl.AccountServiceImpl,
package com.itheima.service.impl;
import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import java.util.List;
public class AccountServiceImpl implements IAccountService {
private IAccountDao 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 updateAccount(Account account) {
accountDao.updateAccount(account);
}
public void deleteAccount(Integer accountId) {
accountDao.deleteAccount(accountId);
}
} 我们需要在resources中的bean.xml中配置Service、配置Dao、配置QueryRunner
<?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"> <!--配置Service--> <bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl"> <!--注入dao--> <property name="accountDao" ref="accountDao"></property> </bean> <!--配置Dao对象--> <bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl"> <!--注入QueryRunner--> <property name="runner" ref="runner"></property> </bean> <!--配置QueryRunner--> <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"> <!--注入数据源--> <constructor-arg name="ds" ref="dataSource"></constructor-arg> </bean> <!--配置数据源--> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!--连接数据库的必备信息--> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/eesy"></property> <property name="user" value="root"></property> <property name="password" value="123"></property> </bean> </beans>在test包下新建一个AccountServiceTest类,测试类。
package com.itheima.test;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.security.AccessControlContext;
import java.util.List;
/**
* 使用Junit单元测试:测试我们的配置
*/
public class AccountServiceTest {
@Test
public void testFindAll() {
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2、得到业务层对象
IAccountService as = ac.getBean("accountService",IAccountService.class);
//3、执行方法
List<Account> accounts = as.findAllAccount();
for (Account account:accounts) {
System.out.println(account);
}
}
@Test
public void testFindOne() {
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2、得到业务层对象
IAccountService as = ac.getBean("accountService",IAccountService.class);
//3、执行方法
Account account = as.findAccountById(1);
System.out.println(account);
}
@Test
public void testSave() {
Account account = new Account();
account.setName("test");
account.setMoney(12345f);
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2、得到业务层对象
IAccountService as = ac.getBean("accountService",IAccountService.class);
as.saveAccount(account);
}
@Test
public void testUpdate() {
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2、得到业务层对象
IAccountService as = ac.getBean("accountService",IAccountService.class);
Account account = as.findAccountById(4);
account.setName("test11");
account.setMoney(23456f);
as.updateAccount(account);
}
@Test
public void testDelete() {
//1、获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2、得到业务层对象
IAccountService as = ac.getBean("accountService",IAccountService.class);
as.deleteAccount(4);
}
} 在pom.xml中我们需要注册的依赖有spring、dbutils、mysql、junit、c3p0。
<?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.itheima</groupId> <artifactId>day02_eesy_02account_xmlioc</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</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>5.1.32</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> </project>

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