黑马springcloud

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jimoshalengzhou 2024-10-13 11:05:41

文章标签 黑马springcloud java spring junit bc 文章分类 架构后端开发

Spring

1、IOC/DI配置管理第三方bean

案例:数据源对象管理

<!--    管理DruidDataSource对象-->
    <bean  class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_db"/>
        <property name="user" value="root"/>
        <property name="password" value="123456"/>
    </bean>

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.20</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.11</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
       <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.16</version>
        </dependency>
    </dependencies>

加载properties文件

开启context空间

<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
">

<!--    1.开启context命名空间-->
<!--    2.使用context空间加载properties文件-->
    <context:property-placeholder location="jdbc.properties"/>
    <bean  class="com.alibaba.druid.pool.DruidDataSource">
<!--        使用${key} 来读取properties配置文件中的内容并完成属性注入-->
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="bookDao" class="com.itheima.dao.impl.BookDaoImpl">
        <property name="name" value="${jdbc.driver}"/>
    </bean>

标签会加载系统的环境变量，而且环境变量的值会被优先加载。解决方案

<context:property-placeholder location="jdbc.properties" system-properties-mode="NEVER"/>

当有多个properties配置文件需要被加载，该如何配置?

<context:property-placeholder location="jdbc.properties,jdbc2.properties" system-properties-mode="NEVER"/>
    
<context:property-placeholder location="*.properties" system-properties-mode="NEVER"/>
   
<context:property-placeholder location="classpath:*.properties" system-properties-mode="NEVER"/>
   
<context:property-placeholder location="classpath*:*.properties" system-properties-mode="NEVER"/>  <!-- 用这个-->

2、容器

容器的创建方式

ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
 ApplicationContext ctx2 = new FileSystemXmlApplicationContext("F:\\javacode\\SSM\\Spring\\Spring10\\src\\main\\resources\\applicationContext.xml");

Bean的三种获取方式

BookDao bookDao = ctx.getBean(BookDao.class);
BookDao bookDao = ctx.getBean("bookDao",BookDao.class);
BookDao bookDao = (BookDao) ctx.getBean("bookDao");

package com.itheima;

import com.itheima.dao.BookDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class App {
    public static void main(String[] args) {
        //1.加载类路径下的配置文件
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

//        //2.从文件系统下加载配置文件
//        ApplicationContext ctx2 = new FileSystemXmlApplicationContext("F:\\javacode\\SSM\\Spring\\Spring10\\src\\main\\resources\\applicationContext.xml");

        BookDao bookDao = ctx.getBean(BookDao.class);
        //BookDao bookDao = ctx.getBean("bookDao",BookDao.class);
        //BookDao bookDao = (BookDao) ctx.getBean("bookDao");
        bookDao.save();

    }
}

容器类层次结构

黑马springcloud_黑马springcloud

BeanFactory的使用

package com.itheima;

import com.itheima.dao.BookDao;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

public class AppForBeanFactory {
    public static void main(String[] args) {
        Resource resources = new ClassPathResource("applicationContext.xml");
        BeanFactory bf = new XmlBeanFactory(resources);
        BookDao bookDao = bf.getBean(BookDao.class);
        bookDao.save();
    }
}

黑马springcloud_黑马springcloud_02

黑马springcloud_spring_03

3、注解开发

注解开发定义bean

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;

//@Component("bookDao")
@Repository("bookDao")
//@Controller
public class BookDaoImpl implements BookDao {
    @Override
    public void save() {
        System.out.println("book dao save...");
    }
}

<!--    <context:component-scan base-package="com.itheima.dao.impl"/>-->
    <context:component-scan base-package="com.itheima"/>

还衍生出了其他三个注解@Controller 、@Service 、@Repository

纯注解开发模式

package com.itheima.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan ("com.itheima")
public class SpringConfig {

}

import com.itheima.Service.BookService;
import com.itheima.config.SpringConfig;
import com.itheima.dao.BookDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class AppForAnnotation {
    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);

        BookDao bookDao = (BookDao) ctx.getBean("bookDao");
        bookDao.save();

        BookService bookService = ctx.getBean(BookService.class);
        System.out.println(bookService);
    }
}

注解开发bean作用范围与生命周期管理

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Repository;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;


@Repository
@Scope("singleton")
public class BookDaoImpl implements BookDao {
    @Override
    public void save() {
        System.out.println("book dao save...");
    }

    @PostConstruct
    public void init() {
        System.out.println("init dao save...");
    }

    @PreDestroy
    public void destory() {
        System.out.println("destory dao save...");
    }


}

package com.itheima;


import com.itheima.config.SpringConfig;
import com.itheima.dao.BookDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    public static void main(String[] args) {

        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        BookDao bookDao1 = ctx.getBean(BookDao.class);
        BookDao bookDao2 = ctx.getBean(BookDao.class);
        System.out.println(bookDao1);
        System.out.println(bookDao2);
        ctx.close();

    }
}

注解开发依赖注入

引用类型

package com.itheima.Service.impl;

import com.itheima.Service.BookService;
import com.itheima.dao.BookDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

//@Component
@Service
public class BookServiceImpl implements BookService {

    @Autowired
    @Qualifier("bookDao")
    private BookDao bookDao;
    @Override
    public void save() {
        System.out.println("book service save...");
        bookDao.save();
    }


//    public void setBookDao(BookDao bookDao) {
//        this.bookDao = bookDao;
//    }
}

简单类型

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Repository;

@Repository("bookDao")
public class BookDaoImpl implements BookDao {
    @Value("itheima")
    private String name;

    @Override
    public void save() {
        System.out.println("book dao save..."+name);
    }
}

注解读取properties配置文件

package com.itheima.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

@Configuration
@ComponentScan ("com.itheima")
//@PropertySource({"jdbc.properties","jdbc.properties","jdbc.properties"})
@PropertySource({"jdbc.properties"})
public class SpringConfig {

}

package com.itheima.dao.impl;

import com.itheima.dao.BookDao;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Repository;


@Repository("bookDao")

public class BookDaoImpl implements BookDao {
    @Value("${name}")
    private String name;

    @Override
    public void save() {
        System.out.println("book dao save..."+name);
    }
}

@PropertySource 注解属性中不支持使用通配符* ,运行会报错

@PropertySource 注解属性中可以把classpath: 加上,代表从当前项目的根路径找文件

IOC/DI注解开发管理第三方bean

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

//方式一
//@Configuration
public class JdbcConfig {
    //定义一个方法获得要管理的对象
    //添加@bean 表示当前方法的返回值是一个bean
    @Bean("dataSource")
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        ds.setUrl("jdbc:mysql://localhost:3306/spring_db");
        ds.setUsername("root");
        ds.setPassword("123456");
        return ds;
    }
}

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
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 javax.sql.DataSource;

@Configuration
//@ComponentScan("com.itheima.config")
//方式二
@Import({JdbcConfig.class})
public class SpringConfig {


}

依赖注入

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.itheima.dao.BookDao;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

//方式一
//@Configuration
public class JdbcConfig {

    //简单类型
    @Value("com.mysql.jdbc.Driver")
    private String driver;
    @Value("jdbc:mysql://localhost:3306/spring_db")
    private String url;
    @Value("root")
    private String username;
    @Value("123456")
    private String password;


    //定义一个方法获得要管理的对象
    //添加@bean 表示当前方法的返回值是一个bean
    //引用类型
    @Bean("dataSource")
    public DataSource dataSource(BookDao bookDao){
        System.out.println(bookDao);
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(username);
        ds.setPassword(password);
        return ds;
    }
}

黑马springcloud_spring_04

4、Spring整合

MyBatis

黑马springcloud_bc_05

黑马springcloud_黑马springcloud_06

坐标

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.20</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>

配置类

package com.itheima.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class MybatisConfig {

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.itheima.daomain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }
}

import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class App2 {
    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        AccountService accountService = ctx.getBean(AccountService.class);

        Account  account = accountService.findById(3);

        System.out.println(account);
    }
}

JUnit

package com.itheima.service;

import com.itheima.config.SpringConfig;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {

    @Autowired
    private AccountService accountService;

    @Test
    public void testFindById(){
        System.out.println(accountService.findById(3));
    }

    @Test
    public void testfindAll(){
        System.out.println(accountService.findAll());
    }
}

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