Spring
重点内容IoC和AOP
Spring框架最核心的就是所谓的依赖注射和控制反转
Spring是分层的 JavaSE/EE 应用 full-stack 轻量级开源框架，以ioC（控制反转）
- 控制反转：是面向对象编程的一种设计原则，用来降低代码的耦合度。
通过控制反转，对象在被创建时，依赖被注入到对象中。 -
此部分可快速实现增删改查
Spring注解
<meta charset="utf-8">
<trans oldtip="编写XML 配置spring账户转账案例" newtip="编写XML 配置spring账户转账案例" style="">编写XML 配置spring账户转账案例</trans>
<trans oldtip=" 实体类Account .java" newtip=" 实体类Account .java" style="">实体类Account .java</trans>
package com.neusoft.domain;
import java.io.Serializable;
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 +
'}';
}
}
<trans oldtip="Dao" newtip="Dao">Dao</trans>
package com.neusoft.dao;
import com.neusoft.domain.Account;
import java.util.List;
public interface IAccountDao {
List<Account> findAllAccount();
Account findAccountById(Integer accountId);
void saveAccount(Account account);
void updateAccount(Account account);
void deleteAccount(Integer accountId);
}
<trans oldtip="impl" newtip="impl">impl</trans>
package com.neusoft.dao.Impl;
import com.neusoft.dao.IAccountDao;
import com.neusoft.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import java.sql.SQLException;
import java.util.List;
/**
* @author Eric Lee
* @date 2020/9/5 11:10
*/
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 (SQLException 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 (SQLException 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 (SQLException 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 (SQLException e) {
throw new RuntimeException(e);
}
}
@Override
public void deleteAccount(Integer accountId) {
try {
runner.update("delete from account where id = ?", accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
<trans oldtip="bean.xml" newtip="bean.xml">bean.xml</trans>
<?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.neusoft.service.impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"></property>
</bean>
<!-- 配置dao-->
<bean id="accountDao" class="com.neusoft.dao.Impl.AccountDaoImpl">
<!-- 注入qr-->
<property name="runner" ref="runner"></property>
</bean>
<!-- 配置QueryRunner-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner">
<!-- 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">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/java9_spring"></property>
<property name="user" value="root"></property>
<property name="password" value="root"></property>
</bean>
</beans>
<trans oldtip="service" newtip="service">service</trans>
package com.neusoft.service;
import com.neusoft.domain.Account;
import java.util.List;
public interface IAccountService {
// 查询所有
List<Account> findAllAccount();
Account findAccountById(Integer accountId);
void saveAccount(Account account);
void updateAccount(Account account);
void deleteAccount(Integer accountId);
}
<trans oldtip="实现" newtip="实现">实现</trans>
package com.neusoft.service.impl;
import com.neusoft.dao.IAccountDao;
import com.neusoft.dao.Impl.AccountDaoImpl;
import com.neusoft.domain.Account;
import com.neusoft.service.IAccountService;
import java.util.List;
public class AccountServiceImpl implements IAccountService {
private IAccountDao accountDao;
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 accountId) {
accountDao.deleteAccount(accountId);
}
}
<trans oldtip="Test" newtip="Test">Test</trans>
package com.neusoft.test;
import com.neusoft.domain.Account;
import com.neusoft.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
/**
* @author Eric Lee
* @date 2020/9/5 14:09
*/
public class TestAccountService {
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
IAccountService as = ac.getBean("accountService", IAccountService.class);
@Test
public void testFindAll() {
//3.执行方法
List<Account> accounts = as.findAllAccount();
for(Account account : accounts){
System.out.println(account);
}
}
@Test
public void testFindOne() {
//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);
//3.执行方法
as.saveAccount(account);
}
@Test
public void testUpdate() {
//3.执行方法
Account account = as.findAccountById(4);
account.setMoney(23456f);
as.updateAccount(account);
}
@Test
public void testDelete() {
//3.执行方法
as.deleteAccount(4);
}
}
使用注解进行配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.neusoft">
</context:component-scan>
<!-- 配置QueryRunner-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner">
<!-- 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">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/java9_spring"></property>
<property name="user" value="root"></property>
<property name="password" value="root"></property>
</bean>
</beans>
<trans oldtip="核心修改" newtip="核心修改">核心修改</trans>
<trans oldtip=" 将对象交给spring去管理， 指定扫描的包名" newtip=" 将对象交给spring去管理， 指定扫描的包名" style="">将对象交给spring去管理， 指定扫描的包名</trans>
<context:component-scan base-package="com.neusoft">
</context:component-scan>
<trans oldtip="service层" newtip="service层">service层</trans>
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