基于xml的IoC的案例
一、首先在pom.xml导入jar包，
<packaging>jar</packaging> <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>5.1.6</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>
二、创建数据库eesy，创建表account
id（int）、name（varchar）、money（float）
三、首先写业务层接口 IAccountService
package com.zzu.service;
import com.zzu.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);
//更新
void updateAccount(Account account);
//删除
void deleteAccount(Integer acccountId);
}
四、创建账户的实体类 Account
package com.zzu.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 +
'}';
}
} 五、账户的业务层实现类AccountServiceImpl
package com.zzu.service.impl;
import com.zzu.dao.IAccountDao;
import com.zzu.domain.Account;
import com.zzu.service.IAccountService;
import java.util.List; public class AccountServiceImpl implements IAccountService{
private IAccountDao accountDao;//业务层调用持久层，创建dao.IAccountDao和dao.AccountDaoImpl
public void setAccountDao(IAccountDao accountDao) {
this.accountDao = accountDao;
}
@Override
public List<Account> findAllAccount() {
return accountDao.findAllAccount();
}
@Override
public Account findAccountById(Integer accountId) {
return accountDao.findAccountById(accountId);
}
@Override
public void saveAccount(Account account) {
accountDao.saveAccount(account);
}
@Override
public void updateAccount(Account account) {
accountDao.updateAccount(account);
}
@Override
public void deleteAccount(Integer acccountId) {
accountDao.deleteAccount(acccountId);
}
}
六、创建账户的持久层接口
package com.zzu.dao;
import com.zzu.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);
//更新
void updateAccount(Account account);
//删除
void deleteAccount(Integer acccountId);
}
七、持久层实现类
package com.zzu.dao.impl;
import com.zzu.dao.IAccountDao;
import com.zzu.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;
/**
* 账户的持久层实现类
*/
public class AccountDaoImpl implements IAccountDao {
private QueryRunner runner;
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
@Override
public List<Account> findAllAccount() {
try{
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
}catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
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);
}
}
@Override
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);
}
}
@Override
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);
}
}
@Override
public void deleteAccount(Integer accountId) {
try{
runner.update("delete from account where id=?",accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
}
}
八、搭建Spring的开发环境
resources->bean.xml
<?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 --> <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="1234"></property> </bean> </beans>
九、使用Junit单元测试，测试我们的配置
package com.zzu.test;
import org.junit.Test;
//使用Junit单元测试，测试我们的配置
public class AccountServiceTest
{ @Test public void testFindAll() { ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); IAccountService as = ac.getBean("accountService",IAccountService.class); List<Account> accounts = as.findAllAccount(); for(Account account:accounts) { System.out.println(account); } }
}
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