<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
package top.wmgx.spring;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.List;
import java.util.Map;
import java.util.Properties;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private String name;
private Address address;
private String sex;
private int[] grade;
private List<Integer> list;
private Map<String,Integer> map;
private Properties properties;
}
package top.wmgx.spring;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Address {
private String name;
}
<beans>
<!-- 以构造方法注入 -->
<bean id="address" class="top.wmgx.spring.Address">
<constructor-arg name="name" value="asdfe"/>
</bean>
<!-- 注入 -->
<bean id="user" class="top.wmgx.spring.User">
<property name="name" value="lht"/>
<!-- 若为引用类型,用ref 称为bean注入-->
<property name="address" ref="address"/>
<property name="sex" value="男"/>
</bean>
<bean id="user1" class="top.wmgx.spring.User">
<property name="grade">
<array>
<value>1</value>
<value>2</value>
<value>3</value>
<value>4</value>
</array>
</property>
<!-- list注入-->
<property name="list">
<list>
<value>1</value>
<value>2</value>
<value>3</value>
</list>
</property>
<!-- map注入-->
<property name="map">
<map>
<entry key="a" value="12"/>
<entry key="b" value="12"/>
</map>
</property>
<!-- null值注入-->
<property name="address">
<null></null>
</property>
<!-- Properties-->
<property name="properties">
<props>
<prop key="jdbc">jdbc:mysql://loclhost:3306</prop>
<prop key="username">root</prop>
<prop key="pwd">pwd</prop>
</props>
</property>
xmlns:p="http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c"
<bean id="address" class="top.wmgx.spring.Address" p:name="address"/>
<bean id="address1" class="top.wmgx.spring.Address" c:name="address"/>
<!--可以使用别名获取类-->
<alias name="user" alias="userNew"></alias>
<!--Bean中可以添加多个别名-->
<bean id="userT" class="top.wmgx.spring.UserT" name="user2,u2">
</bean>
<import resource="beans.xml"/>
代理模式(默认机制):get到的都是同一个对象。
<bean id="user2" class="top.wmgx.spring.User" c:age="18" c:name="AA" scope="singleton"/>
原型模式:每次从容器中get的时候,都会产生一个新的对象。
<bean id="user2" class="top.wmgx.spring.User" c:age="18" c:name="AA" scope="prototype"/>
<!--
byName:会自动在容器上下文中查找和自己对象set方法后面的值对应的beanid!
-->
<bean id="address" class="top.wmgx.spring.Address" p:name="address"/>
<!--
user中的adddress 会自动注入上面的address
-->
<bean id="user" class="top.wmgx.spring.User" autowire="byName">
</bean>
注意:bean的ID需要和set方法后面的单词一致(首字母小写)
<!--
byName:会自动在容器上下文中查找和自己对象set方法后面的值对应的beanid!
-->
<bean id="address" class="top.wmgx.spring.Address" p:name="address"/>
<!--
user中的adddress 会自动注入上面的address
-->
<bean id="user" class="top.wmgx.spring.User" autowire="byType">
</bean>
注意:bean中的class唯一,只能有一个这个类型的bean
加入
<!--
beans标签中加入 xmlns:context="http://www.springframework.org/schema/context"
与
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd"
同时开启注解配置支持
<context:annotation-config/>
-->
<?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
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
</beans>
注解在属性上使用,可以不写set方法,
在使用@Autowired时,首先在容器中查询对应类型的bean
二者既可以放在属性上也可以放在set方法上(set方法可以省略)
在导入的 spring-webmvc:5.2.3中已经默认包含,使用低版本spring时要手动导入。
<!--指定要扫描的包,包下的注解会自动生效-->
<context:component-scan base-package="top.wmgx.spring"/>
package top.wmgx.spring;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
// 声明是一个组件
//Component(“id”)可以指定ID 默认是首字母小写
@Component()
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Address {
//相当于<property name="name" value="123123"/>
@Value("123123")
private String name;
}
@Qualifier(value="“bean的名字”")
package top.wmgx.spring;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Component;
//表示会被spring接管
@Component
//表示这是一个配置类
@Configuration
//扫描哪个包
@ComponentScan("top.wmgx.spring")
//如果要引入其他的配置类
//可以使用 @Import(Config1.class)
public class Config {
//相当于是一个bean,方法名就是ID
@Bean
public User getUser(){
return new User();
}
}
package top.wmgx.spring;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class UserTest {
@Test
public void Test(){
//注意改为了AnnotationConfigApplicationContext
ApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
User user =(User)context.getBean("getUser");
System.out.println(user);
}
}
AOP(Aspect Oriented Programming)意为:面向切面编程,通过预编译方式和运行期动态代理实现程序功能的统一维护的一种技术。AOP是OOP的延续,是软件开发中的一个热点,也是Spring框架中的一个重要内容,是函数式编程的一种衍生泛型,利用AOP可以对业务逻辑的各个部分进行隔离,从而使得业务逻辑各部分之间的耦合度降低,提高程序的可重用性,同时提高了开发的频率。
==提供声明式事务;允许用户自定义切面==
SpringAOP中,通过Advice定义横切逻辑,Spring中支持5种类型的Advice:
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.5</version>
</dependency>
xml中要添加AOP的约束
xmlns:aop="http://www.springframework.org/schema/aop"
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
public interface UserService {
public void add();
public void delete();
public void update();
public void search();
}
public class UserServiceImpl implements UserService{
@Override
public void add() {
System.out.println("增加用户");
}
@Override
public void delete() {
System.out.println("删除用户");
}
@Override
public void update() {
System.out.println("更新用户");
}
@Override
public void search() {
System.out.println("查询用户");
}
}
<?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"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<context:annotation-config/>
<context:component-scan base-package="top.wmgx.spring"/>
<!-- 将切入类与要切入的类注册-->
<bean id="log" class="top.wmgx.spring.Log"/>
<bean id = "UserServiceImp" class="top.wmgx.spring.UserServiceImp"></bean>
<!-- 配置切入点-->
<aop:config>
<!-- 切入点的命名,要切入的方法-->
<!-- 1、execution(): 表达式主体。
2、第一个*号:表示返回类型, *号表示所有的类型。
3、包名:表示需要拦截的包名,后面的两个句点表示当前包和当前包的所有子包,com.sample.service.impl包、子孙包下所有类的方法。
4、第二个*号:表示类名,*号表示所有的类。
5、*(..):最后这个星号表示方法名,*号表示所有的方法,后面括弧里面表示方法的参数,两个句点表示任何参数
-->
<aop:pointcut id="pointcut" expression="execution(* top.wmgx.spring.UserServiceImp.* (..))"/>
<!-- 配置切入类,到具体的切入点-->
<aop:advisor advice-ref="log" pointcut-ref="pointcut"></aop:advisor>
</aop:config>
</beans>
Test
package top.wmgx.spring;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UserTest {
@Test
public void Test(){
ApplicationContext context = new ClassPathXmlApplicationContext("SpringTest.xml");
UserService user =(UserService)context.getBean("UserServiceImp");
user.add();
user.delete();
}
}
package top.wmgx.spring;
public class Log implements {
public void before() {
System.out.println("之前");
}
public void after() {
System.out.println("之后");
}
}
<!-- 将切入类与要切入的类注册-->
<bean id="log" class="top.wmgx.spring.Log"/>
<bean id = "UserServiceImp" class="top.wmgx.spring.UserServiceImp"></bean>
<!-- 配置切入点-->
<aop:config>
<aop:aspect ref="log">
<aop:pointcut id="pointcut" expression="execution(* top.wmgx.spring.UserServiceImp.* (..))"/>
<!-- 配置切入类,到具体的切入点-->
<aop:before pointcut-ref="pointcut" method="before"/>
<aop:after pointcut-ref="pointcut" method="after"/>
</aop:aspect>
</aop:config>
package top.wmgx.spring;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class Log{
@Before("execution(* top.wmgx.spring.UserServiceImp.* (..))")
public void before() {
System.out.println("之前");
}
@After("execution(* top.wmgx.spring.UserServiceImp.* (..))")
public void after() {
System.out.println("之后");
}
@Around("execution(* top.wmgx.spring.UserServiceImp.* (..))")
public void around(ProceedingJoinPoint jp) throws Throwable {
System.out.println("环绕前");
Object proceed = jp.proceed();//手动调用执行
System.out.println("环绕后");
}
}
<context:component-scan base-package="top.wmgx.spring"/>
<bean id="log" class="top.wmgx.spring.Log"/>
<bean id = "UserServiceImp" class="top.wmgx.spring.UserServiceImp"></bean>
<aop:aspectj-autoproxy/>
<?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>springtest</groupId>
<artifactId>springtest</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- webmvc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.10.RELEASE</version>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
</dependency>
<!-- annotations-java5-->
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>annotations-java5</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
<!-- junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- aspectjweaver-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.5</version>
</dependency>
<!-- mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!-- mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
不需要写 sqlSessionFactory 但是需要为原先的接口提供一个实现类,并且添加setSqlSession方法以接受setSqlSession ,并在接口是实现方法中提供setSqlSession的使用
配置数据源
<!--配置数据源:数据源有非常多,可以使用第三方的,也可使用Spring的-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
配置SqlSessionFactory,关联MyBatis
<!--配置SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--关联Mybatis-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="classpath:top/wmgx/spring/dao/*.xml"/>
</bean>
注册sqlSessionTemplate,关联sqlSessionFactory
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--利用构造器注入-->
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
增加Dao接口的实现类
public class UserDaoImp implements UserMapper {
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> selectUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUser();
}
}
配置mybatis的配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<mappers>
<mapper class="top.wmgx.spring.dao.UserDao"/>
</mappers>
</configuration>
注册Dao接口实现类
<bean id="userDao" class="top.wmgx.spring.dao.UserDaoImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
使用
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserMapper mapper = (UserMapper) context.getBean("userDao");
List<User> user = mapper.selectUser();
System.out.println(user);
}
mybatis-spring1.2.3版以上的才有这个
dao继承Support类 , 直接利用 getSqlSession() 获得 , 然后直接注入SqlSessionFactory . 比起方式1 , 不需要管理SqlSessionTemplate
UserDaoImp
public class UserDaoImp extends SqlSessionDaoSupport implements UserMapper {
public List<User> selectUser() {
UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
return mapper.selectUser();
}
}
修改bean配置
<bean id="userDao" class="top.wmgx.spring.dao.UserDaoImp">
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
测试
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserMapper mapper = (UserMapper) context.getBean("userDao");
List<User> user = mapper.selectUser();
System.out.println(user);
}
编程式事务管理
声明式事务管理
事务管理器
xmlns:tx="http://www.springframework.org/schema/tx"
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!--配置哪些方法使用什么样的事务,配置事务的传播特性-->
<tx:method name="add" propagation="REQUIRED"/>
<tx:method name="delete" propagation="REQUIRED"/>
<tx:method name="update" propagation="REQUIRED"/>
<tx:method name="search*" propagation="REQUIRED"/>
<tx:method name="get" read-only="true"/>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!--配置aop织入事务-->
<aop:config>
<aop:pointcut id="txPointcut" expression="execution(* top.wmgx.spring.dao.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
</aop:config>
spring支持7种事务传播行为:
以propagation_requierd举例
当一个方法中,连续调用多个方法,或间接调用多个方法,这些方法将会工作于一个事务中。
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