10 Spring框架--基于注解和xml的配置的应用案例
本文内容纲要:10 Spring框架--基于注解和xml的配置的应用案例
1.项目结构
2.基于xml配置的项目
<1>账户的业务层接口及其实现类
IAccountService.java
package lucky.service;import lucky.domain.Account;
import java.util.List;
/**
* 账户的业务层接口
*/
public interface IAccountService {
/**
* 查询所有
* @return
*/
List<Account> queryAllAccount();
/**
* 查询一个
* @return
*/
Account queryAccountById(Integer accountId);
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 更新账户信息
* @param account
*/
void updateAccount(Account account);
/**
* 删除用户
* @param accountId
*/
void deleteAccount(Integer accountId);
}
AccountServiceImpl.java
package lucky.service.impl;import lucky.dao.IAccountDao;
import lucky.domain.Account;
import lucky.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> queryAllAccount() {
return accountDao.queryAllAccount();
}
public Account queryAccountById(Integer accountId) {
return accountDao.queryAccountById(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);
}
}
<2>账户的持久层接口及其实现类
IAccountDao.java
package lucky.dao;import lucky.domain.Account;
import java.util.List;
/**
* 账户的持久层接口
*/
public interface IAccountDao {
/**
* 查询所有
* @return
*/
List<Account> queryAllAccount();
/**
* 查询一个
* @return
*/
Account queryAccountById(Integer accountId);
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 更新账户信息
* @param account
*/
void updateAccount(Account account);
/**
* 删除用户
* @param accountId
*/
void deleteAccount(Integer accountId);
}
IAccountDaoImpl.java
package lucky.dao.impl;import lucky.dao.IAccountDao;
import lucky.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;
/**
* 账户的持久层实现类
*/
public class IAccountDaoImpl implements IAccountDao {
private QueryRunner runner;
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
public List<Account> queryAllAccount() {
try {
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public Account queryAccountById(Integer accountId) {
try {
return runner.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 {
runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
} catch (SQLException 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 (SQLException e) {
throw new RuntimeException(e);
}
}
public void deleteAccount(Integer accountId) {
try {
runner.update("delete from account where id=?",accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
<3>数据库表account对应的Account.java
package lucky.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 +
'}';
}
}
<4>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 -->
<!--创建AccountServiceImpl这个类的bean对象-->
<bean id="accountService" class="lucky.service.impl.AccountServiceImpl">
<!-- 使用set方法,注入dao -->
<property name="accountDao" ref="accountDao"></property>
</bean>
<!--配置Dao对象-->
<bean id="accountDao" class="lucky.dao.impl.IAccountDaoImpl">
<!-- 使用set方法,注入QueryRunner -->
<property name="runner" ref="runner"></property>
</bean>
<!--配置QueryRunner-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<!--使用构造函数注入,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/spring"></property>
<property name="user" value="root"></property>
<property name="password" value="plj824"></property>
</bean>
</beans>
<5>测试类
import lucky.domain.Account;import lucky.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class AccountServiceTest {
@Test
public void testQueryAllAccount(){
//1.获取容器
ApplicationContext ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as= (IAccountService) ac.getBean("accountService");
//3.执行方法
List<Account> accounts = as.queryAllAccount();
for (Account account : accounts) {
System.out.println(account);
}
}
@Test
public void testQueryAccountById(){
//1.获取容器
ApplicationContext ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as= (IAccountService) ac.getBean("accountService");
//3.执行方法
Account account1 = as.queryAccountById(1);
System.out.println(account1);
}
@Test
public void testSaveAccount(){
//1.获取容器
ApplicationContext ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as= (IAccountService) ac.getBean("accountService");
//3.执行方法
Account account=new Account();
account.setName("lucky");
account.setMoney(1000f);
as.saveAccount(account);
}
@Test
public void testUpdateAccount(){
//1.获取容器
ApplicationContext ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as= (IAccountService) ac.getBean("accountService");
//3.执行方法
Account account1 = as.queryAccountById(1);
account1.setMoney(2000f);
as.updateAccount(account1);
}
@Test
public void testDeleteAccount(){
//1.获取容器
ApplicationContext ac=new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as= (IAccountService) ac.getBean("accountService");
//3.执行方法
as.deleteAccount(4);
}
}
效果图:
数据库表:
testQueryAllAccount()测试输出:
testQueryAccountById()
2.基于部分注解配置的项目(一定程度上还是要使用xml配置,自己写的类用注解,jar包的类用xml配置)
<1>修改IAccountDaoImpl.java
package lucky.dao.impl;import lucky.dao.IAccountDao;
import lucky.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.sql.SQLException;
import java.util.List;
/**
* 账户的持久层实现类
*/
@Repository("accountDao")
public class IAccountDaoImpl implements IAccountDao {
@Autowired
private QueryRunner runner;
public List<Account> queryAllAccount() {
try {
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public Account queryAccountById(Integer accountId) {
try {
return runner.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 {
runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
} catch (SQLException 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 (SQLException e) {
throw new RuntimeException(e);
}
}
public void deleteAccount(Integer accountId) {
try {
runner.update("delete from account where id=?",accountId);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
<2>AccountServiceImpl.java
package lucky.service.impl;import lucky.dao.IAccountDao;
import lucky.domain.Account;
import lucky.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("accountService")
public class AccountServiceImpl implements IAccountService {
@Autowired
private IAccountDao accountDao;
public List<Account> queryAllAccount() {
return accountDao.queryAllAccount();
}
public Account queryAccountById(Integer accountId) {
return accountDao.queryAccountById(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);
}
}
<3>修改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"
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">
<!--告知spring在创建容器是要扫描的包-->
<context:component-scan base-package="lucky"></context:component-scan>
<!--配置QueryRunner-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<!--使用构造函数注入,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/spring"></property>
<property name="user" value="root"></property>
<property name="password" value="plj824"></property>
</bean>
</beans>
3.基于纯注解配置的项目
spring中的新注解
@Configuration
作用:指定当前类是一个配置类
细节:当配置类作为AnnotationConfigApplicationContext对象创建的参数时,该注解可以不写。
@ ComponentScan
作用:用于通过注解指定spring在创建容器时要扫描的包
属性:
value:它和basePackages的作用是一样的,都是用于指定创建容器时要扫描的包。
我们使用此注解就等同于在xml中配置了:
<context:component-scan base-package="lucky"></context:component-scan>
@ Bean
作用:用于把当前方法的返回值作为bean对象存入spring的ioc容器中
属性:
name:用于指定bean的id。当不写时,默认值是当前方法的名称
细节:
当我们使用注解配置方法时,如果方法有参数,spring框架会去容器中查找有没有可用的bean对象。
查找的方式和Autowired注解的作用是一样的
@ Import
作用:用于导入其他的配置类
属性:
value:用于指定其他配置类的字节码。
当我们使用Import的注解之后,有Import注解的类就父配置类,而导入的都是子配置类
@ PropertySource
作用:用于指定properties文件的位置
属性:
value:指定文件的名称和路径。
关键字:classpath,表示类路径下
<1>项目结构
<2>在java包下创建名为config的包
SpringConfiguration.java为主配置类
package config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
/**
* 该类是一个配置类,它的作用和bean.xml是一样的
* spring中的新注解
* Configuration
* 作用:指定当前类是一个配置类
* 细节:当配置类作为AnnotationConfigApplicationContext对象创建的参数时,该注解可以不写。
* ComponentScan
* 作用:用于通过注解指定spring在创建容器时要扫描的包
* 属性:
* value:它和basePackages的作用是一样的,都是用于指定创建容器时要扫描的包。
* 我们使用此注解就等同于在xml中配置了:
* <context:component-scan base-package="lucky"></context:component-scan>
* Bean
* 作用:用于把当前方法的返回值作为bean对象存入spring的ioc容器中
* 属性:
* name:用于指定bean的id。当不写时,默认值是当前方法的名称
* 细节:
* 当我们使用注解配置方法时,如果方法有参数,spring框架会去容器中查找有没有可用的bean对象。
* 查找的方式和Autowired注解的作用是一样的
* Import
* 作用:用于导入其他的配置类
* 属性:
* value:用于指定其他配置类的字节码。
* 当我们使用Import的注解之后,有Import注解的类就父配置类,而导入的都是子配置类
* PropertySource
* 作用:用于指定properties文件的位置
* 属性:
* value:指定文件的名称和路径。
* 关键字:classpath,表示类路径下
*/
@Configuration
@ComponentScan(basePackages = "lucky")
@PropertySource("classpath:jdbcConfig.properties")
@Import(JdbcConfig.class)
public class SpringConfiguration {
}
JdbcConfig.java
package config;import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Scope;
import javax.sql.DataSource;
/**
* 和spring连接数据库相关的配置类
*/
public class JdbcConfig {
@Value("${jdbc.driver}")
private String driver;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
/**
* 用于创建一个QueryRunner对象
* @param dataSource
* @return
*/
@Bean(name="runner")
@Scope("prototype")
public QueryRunner createQueryRunner(@Qualifier("ds2") DataSource dataSource){
return new QueryRunner(dataSource);
}
/**
* 创建数据源对象
* @return
*/
@Bean(name="ds2")
public DataSource createDataSource(){
try {
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(driver);
ds.setJdbcUrl(url);
ds.setUser(username);
ds.setPassword(password);
return ds;
}catch (Exception e){
throw new RuntimeException(e);
}
}
@Bean(name="ds1")
public DataSource createDataSource1(){
try {
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(driver);
ds.setJdbcUrl("jdbc:mysql://localhost:3306/mybatis");
ds.setUser(username);
ds.setPassword(password);
return ds;
}catch (Exception e){
throw new RuntimeException(e);
}
}
}
jdbcConfig.properties
jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=plj824
此时,没有bean.xml文件了。
本文内容总结:10 Spring框架--基于注解和xml的配置的应用案例
原文链接:https://www.cnblogs.com/luckyplj/p/11319870.html
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