Java之Spring入门到精通【IDEA版】IoC和DI注解开发（二）（一篇文章精通系列）

电玩女神 2022-09-11 05:25 156阅读 0赞

**上一篇文章地址：[Java之Spring入门到精通【IDEA版】Spring的IoC和DI（一）（一篇文章精通系列）][Java_Spring_IDEA_Spring_IoC_DI]**

### IoC和DI注解开发 ###

*   *  一、Spring配置数据源
     *   *  1、数据源（连接池）
         *   *  1）数据源（连接池）的作用
             *  2）数据源的开发步骤
         *  2、数据源的手动创建（Java代码实现）
         *   *  （1）创建新的项目
             *  （2）导入c3p0和druid的，mysql数据库驱动坐标
             *  （3）创建test数据库
             *  （4）创建C3P0连接池
             *  （5）创建Druid连接池
         *  3、数据源的手动创建（读取jdbc.properties）
         *   *  （1）提取jdbc.properties配置文件
             *  （2）读取jdbc.properties配置文件创建连接池
         *  4、测试从容器当中获取数据源（applicationContext.xml）
         *   *  （1）创建applicationContext.xml
             *  （2）创建测试类，测试从容器当中获取数据源
         *  5、抽取jdbc配置文件
         *   *  （1）修改applicationContext.xml
     *  二、Spring注解开发
     *   *  1、Spring原始注解
         *   *  （1）需要进行扫描以便识别使用注解配置的类、字段和方法。
             *  （2）UserDao：使用@Compont或@Repository标识UserDaoImpl需要Spring进行实例化。
             *  （3）UserServiceImpl
             *  （4）创建UserController
             *  （5）使用@Value进行字符串的注入
             *  （6）使用@Scope标注Bean的范围
             *  （7）使用@PostConstruct标注初始化方法，使用@PreDestroy标注销毁方法
         *  3、Spring新注解
         *   *  （1）创DataSourceConfiguration
             *  （2）创建SpringConfiguration
     *  三、Spring集成Junit
     *   *  1、原始Junit测试Spring的问题
         *  2、上述问题解决思路
         *  3、Spring集成Junit步骤
         *  4、Spring集成Junit代码实现
         *   *  （1）导入spring集成Junit的坐标
             *  （2）创建SpringJunitTest
         *  5、知识要点

## 一、Spring配置数据源 ##

### 1、数据源（连接池） ###

#### 1）数据源（连接池）的作用 ####

*  数据源(连接池)是提高程序性能如出现的
 *  事先实例化数据源，初始化部分连接资源
 *  使用连接资源时从数据源中获取
 *  使用完毕后将连接资源归还给数据源

常见的数据源(连接池)：DBCP、C3P0、BoneCP、Druid等

#### 2）数据源的开发步骤 ####

*  导入数据源的坐标和数据库驱动坐标
 *  创建数据源对象
 *  设置数据源的基本连接数据
 *  使用数据源获取连接资源和归还连接资源

### 2、数据源的手动创建（Java代码实现） ###

#### （1）创建新的项目 ####

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#### （2）导入c3p0和druid的，mysql数据库驱动坐标 ####

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<?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>com.itbluebox</groupId>
        <artifactId>Spring-DB</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    
        <properties>
            <spring.version>5.0.5.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>c3p0</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.1.2</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.10</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.39</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
    </project>

#### （3）创建test数据库 ####

SET FOREIGN_KEY_CHECKS=0;
    -- ----------------------------
    -- Table structure for `book`
    -- ----------------------------
    DROP TABLE IF EXISTS `book`;
    CREATE TABLE `book` (
      `id` int(15) NOT NULL AUTO_INCREMENT,
      `title` varchar(20) NOT NULL,
      `auth` varchar(20) DEFAULT NULL,
      `price` float(20,2) DEFAULT NULL,
      `cbs` varchar(20) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
    -- ----------------------------
    -- Records of book
    -- ----------------------------
    INSERT INTO `book` VALUES ('1', 'Java从入门到精通', '张三', '15.00', '清华大学');
    INSERT INTO `book` VALUES ('5', '11', '11', '11.00', '11');
    INSERT INTO `book` VALUES ('6', '11', '11', '11.00', '11');
    INSERT INTO `book` VALUES ('8', 'JavaScript入门', '刘伟', '55.60', '哈哈');
    INSERT INTO `book` VALUES ('10', 'MySQL从入门到精通', '刘玉徐', '85.00', '???');
    -- ----------------------------
    -- Table structure for `user`
    -- ----------------------------
    DROP TABLE IF EXISTS `user`;
    CREATE TABLE `user` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `uname` varchar(255) NOT NULL,
      `upass` varchar(255) DEFAULT NULL,
      `tel` varchar(255) NOT NULL,
      `address` varchar(255) NOT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=124 DEFAULT CHARSET=utf8;
    -- ----------------------------
    -- Records of user
    -- ----------------------------
    INSERT INTO `user` VALUES ('123', '123', '123', '123', '123');

#### （4）创建C3P0连接池 ####

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package com.itbluebox.db;
    
    import com.mchange.v2.c3p0.ComboPooledDataSource;
    import org.junit.Test;
    import java.sql.Connection;
    
    public class TestC3P0 {
        
        @Test
        public void testC3P0() throws Exception{
        
            //数据源
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            //设置数据库连接参数
            dataSource.setDriverClass("com.mysql.jdbc.Driver");
            dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
            dataSource.setUser("root");
            dataSource.setPassword("root");
            //获得连接对象
            Connection connection = dataSource.getConnection();
            System.out.println(connection);
        }
    }

运行测试  
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运行成功  
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#### （5）创建Druid连接池 ####

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package com.itbluebox.db;
    
            import com.alibaba.druid.pool.DruidDataSource;
            import com.alibaba.druid.pool.DruidPooledConnection;
            import org.junit.Test;
    
    public class TestDruid {
        
        @Test
        public void testDruid() throws Exception{
        
            //创建数据库源
            DruidDataSource dataSource = new DruidDataSource();
            //设置数据库连接参数
            dataSource.setDriverClassName("com.mysql.jdbc.Driver");
            dataSource.setUrl("jdbc:mysql://localhost:3306/test");
            dataSource.setUsername("root");
            dataSource.setPassword("root");
            //获取连接对象
            DruidPooledConnection connection = dataSource.getConnection();
            System.out.println(connection);
        }
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 10]  
运行成功  
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### 3、数据源的手动创建（读取jdbc.properties） ###

#### （1）提取jdbc.properties配置文件 ####

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jdbc.driver = com.mysql.jdbc.Driver
    jdbc.url = jdbc:mysql://localhost:3306/test
    jdbc.username = root
    jdbc.password = root

#### （2）读取jdbc.properties配置文件创建连接池 ####

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package com.itbluebox.db;
    
    import com.mchange.v2.c3p0.ComboPooledDataSource;
    import org.junit.Test;
    
    import java.sql.Connection;
    import java.util.ResourceBundle;
    
    public class TestC3P0ByProperties {
        
    
        @Test
        public void C3P0ByProperties() throws Exception{
        
    
            //加载类路径下的jdbc.properties
            ResourceBundle rb = ResourceBundle.getBundle("jdbc");
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            dataSource.setDriverClass(rb.getString("jdbc.driver"));
            dataSource.setJdbcUrl(rb.getString("jdbc.url"));
            dataSource.setUser(rb.getString("jdbc.username"));
            dataSource.setPassword(rb.getString("jdbc.password"));
            Connection connection = dataSource.getConnection();
            System.out.println(connection);
    
        }
    
    }

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### 4、测试从容器当中获取数据源（applicationContext.xml） ###

#### （1）创建applicationContext.xml ####

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#### （2）创建测试类，测试从容器当中获取数据源 ####

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package com.itbluebox.db;
    import org.junit.Test;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import javax.sql.DataSource;
    import java.sql.Connection;
    public class TestC3P0Application {
        
        @Test
        public void TestC3PO() throws  Exception{
        
    
            ClassPathXmlApplicationContext applicationContext =
                    new ClassPathXmlApplicationContext("applicationContext.xml");
            DataSource dataSource = (DataSource)applicationContext.getBean("dataSource");
            Connection connection = dataSource.getConnection();
            System.out.println(connection);
        }
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 20]  
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### 5、抽取jdbc配置文件 ###

#### （1）修改applicationContext.xml ####

*  applicationContext.xml加载jdbc.properties配置文件获得连接信息。
 *  首先，需要引入context命名空间和约束路径：
 *  命名空间：`xmlns:context="http://www.springframework.org/schema/context"`
 *  约束路径：

http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd

*  Spring容器加载properties文件

<context:property-placeholder location="xx.properties"/>
    <property name="" value="${key}"/>

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<?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:p="http://www.springframework.org/schema/p"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd"
    >
        <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="driverClass" value="${jdbc.driver}"/>
            <property name="jdbcUrl" value="${jdbc.url}"/>
            <property name="user" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>
    </beans>

运行测试  
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## 二、Spring注解开发 ##

### 1、Spring原始注解 ###

Spring是轻代码而重配置的框架，配置比较繁重，影响开发效率，所以注解开发是一种趋势，注解代替xml配置文件可以简化配置，提高开发效率。

*  Spring原始注解主要是替代`<Bean>`的配置  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_18_color_FFFFFF_t_70_g_se_x_16]  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_18_color_FFFFFF_t_70_g_se_x_16 1]

注意：

使用注解进行开发时，需要在applicationContext.xml中配置组件扫描，

作用是指定哪个包及其子包下的Bean

#### （1）需要进行扫描以便识别使用注解配置的类、字段和方法。 ####

<context:component-scan base-package="com.itbluebox">
    </context:component-scan>

在这里我们切换回第一篇文章创建的工程Spring-test-demo  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 25]

#### （2）UserDao：使用@Compont或@Repository标识UserDaoImpl需要Spring进行实例化。 ####

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package com.itbluebox.dao.impl;
    
    import com.itbluebox.dao.UserDao;
    import org.springframework.stereotype.Component;
    
    
    @Component("userDao")
    public class UserDaoImpl implements UserDao {
        
    
        public void save() {
        
            System.out.println("UserDao save method running....");
        }
    
    }

#### （3）UserServiceImpl ####

使用@Compont或@Service标识UserServiceImpl需要Spring进行实例化  
使用@Autowired或者@Autowired+@Qulifier或者@Resource进行userDao的注入  
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package com.itbluebox.service.impl;
    import com.itbluebox.dao.UserDao;
    import com.itbluebox.service.UserService;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.Resource;
    
    @Service("userService")
    public class UserServiceImpl implements UserService {
        
    
        /*
        @Autowired
         @Qualifier("userDao")
         */
        @Resource(name="userDao")
        private UserDao userDao;
    
        public void setUserDao(UserDao userDao) {
        
            this.userDao = userDao;
        }
    
        public void save() {
        
            System.out.println("UserServiceImpl save method running....");
            userDao.save();
    
        }
    }

#### （4）创建UserController ####

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package com.itbluebox.web;
    
    import com.itbluebox.service.UserService;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class UserController {
        
    
        public static void main(String[] args) {
        
            ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
            UserService userService = app.getBean(UserService.class);
            userService.save();
        }
    }

运行测试  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 29]  
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#### （5）使用@Value进行字符串的注入 ####

*  引入依赖  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 31]

<?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>com.itbluebox</groupId>
        <artifactId>spring-test-demo</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    
    
    
        <properties>
            <spring.version>5.0.5.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>c3p0</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.1.2</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.10</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.39</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
    </project>

*  创建jdbc.properties![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 32]  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 33]
 *  完善applicationContext.xml配置文件  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 34]

<?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:p="http://www.springframework.org/schema/p"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd"
    >
        <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    
        
        <context:component-scan base-package="com.itbluebox"></context:component-scan>
    
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="driverClass" value="${jdbc.driver}"/>
            <property name="jdbcUrl" value="${jdbc.url}"/>
            <property name="user" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
    
        </bean>
    
    </beans>

*  完善UserDaoImpl  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 35]

package com.itbluebox.dao.impl;
    
    import com.itbluebox.dao.UserDao;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    
    @Component("userDao")
    public class UserDaoImpl implements UserDao {
        
    
        @Value("注入普通数据")
        private String str;
    
        @Value("${jdbc.driver}")
        private String driver;
    
        public void save() {
        
            System.out.println(str);
            System.out.println(driver);
            System.out.println("UserDao save method running....");
        }
    
    }

*  运行测试  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 36]  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_18_color_FFFFFF_t_70_g_se_x_16 2]

#### （6）使用@Scope标注Bean的范围 ####

@Scope("singleton")

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 37]

#### （7）使用@PostConstruct标注初始化方法，使用@PreDestroy标注销毁方法 ####

完善UserServiceImpl  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 38]

package com.itbluebox.service.impl;
    import com.itbluebox.dao.UserDao;
    import com.itbluebox.service.UserService;
    import org.springframework.context.annotation.Scope;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.PostConstruct;
    import javax.annotation.PreDestroy;
    import javax.annotation.Resource;
    
    @Service("userService")
    @Scope("singleton")
    public class UserServiceImpl implements UserService {
        
        /*
        @Autowired
         @Qualifier("userDao")
         */
        @Resource(name="userDao")
        private UserDao userDao;
        public void setUserDao(UserDao userDao) {
        
            this.userDao = userDao;
        }
        public void save() {
        
            System.out.println("UserServiceImpl save method running....");
            userDao.save();
        }
        @PostConstruct
        public void init(){
        
            System.out.println("初始化方法。。。。");
        }
        @PreDestroy
        public void destroy(){
        
            System.out.println("销毁方法。。。。");
        }
    
    }

*  完善UserController，添加app.close()

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 39]

package com.itbluebox.web;
    
    import com.itbluebox.service.UserService;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class UserController {
        
    
        public static void main(String[] args) {
        
            ClassPathXmlApplicationContext app =
                    new ClassPathXmlApplicationContext("applicationContext.xml");
            UserService userService = app.getBean(UserService.class);
            userService.save();
            app.close();
        }
    }

*  运行测试  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 40]  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 41]

### 3、Spring新注解 ###

使用上面的注解还不能全部替代xml配置文件，还需要使用注解替代的配置如下：

非自定义的Bean的配置：`<bean>`  
加载properties文件的配置：`<context:property-placeholder>`  
组件扫描的配置：`<context:component-scan>`  
引入其他文件：`<import>`

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_19_color_FFFFFF_t_70_g_se_x_16]

#### （1）创DataSourceConfiguration ####

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 42]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 43]

package com.itbluebox.config;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.PropertySource;
    
    @PropertySource("classpath:jdbc.properties")
    
    public class DataSourceConfiguration {
        
    
        @Value("${jdbc.driver}")
        private String driver;
    
        @Value("${jdbc.url}")
        private String url;
    
        @Value("${jdbc.username}")
        private String username;
    
        @Value("${jdbc.password}")
        private String password;
        
    	@Bean(name = "dataSource")
        private DataSource getDataSource() throws PropertyVetoException{
        
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            dataSource.setDriverClass(driver);
            dataSource.setJdbcUrl(url);
            dataSource.setUser(username);
            dataSource.setPassword(password);
            return dataSource;
        }
    
    }

#### （2）创建SpringConfiguration ####

@Configuration  
@ComponentScan  
@Import

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 44]

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 45]

package com.itbluebox.config;
    
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Import;
    
    @Configuration
    @ComponentScan("com.itbluebox")
    @Import({
        DataSourceConfiguration.class})
    public class SpringConfiguration {
        
    }

*  删除applicationContext.xml当中dataSource相关配置  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 46]
 *  创建TestAnnoConfig  
    ![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 47]

package com.itbluebox.web;
    
    import com.itbluebox.service.UserService;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class UserController {
        
    
        public static void main(String[] args) {
        
            ClassPathXmlApplicationContext app =
                    new ClassPathXmlApplicationContext("applicationContext.xml");
            UserService userService = app.getBean(UserService.class);
            userService.save();
            app.close();
        }
    }

运行测试  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 48]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 49]

## 三、Spring集成Junit ##

### 1、原始Junit测试Spring的问题 ###

在测试类中，每个测试方法都有以下两行代码：

ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
    
    IAccountService as = ac.getBean("accountService",IAccountService.class);

这两行代码的作用是获取容器，如果不写的话，直接会提示空指针异常。所以又不能轻易删掉。

### 2、上述问题解决思路 ###

让SpringJunit负责创建Spring容器，但是需要将配置文件的名称告诉它  
将需要进行测试Bean直接在测试类中进行注入

### 3、Spring集成Junit步骤 ###

*  导入spring集成Junit的坐标
 *  使用@Runwith注解替换原来的运行期
 *  使用@ContextConfiguration指定配置文件或配置类
 *  使用@Autowired注入需要测试的对象
 *  创建测试方法进行测试

### 4、Spring集成Junit代码实现 ###

#### （1）导入spring集成Junit的坐标 ####

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 50]

<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>

#### （2）创建SpringJunitTest ####

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 51]  
使用@Runwith注解替换原来的运行期，使用  
@ContextConfiguration指定配置文件或配置类  
使用@Autowired注入需要测试的对象  
创建测试方法进行测试

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 52]

package com.itbluebox;
    
    import com.itbluebox.config.SpringConfiguration;
    import com.itbluebox.domain.User;
    import com.itbluebox.service.UserService;
    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)
    //加载spring核心配置文件
    //@ContextConfiguration(value = {"classpath:applicationContext.xml"})
    //加载spring核心配置类
    @ContextConfiguration(classes = {
        SpringConfiguration.class})
    public class SpringJunitTest {
        
    
        @Autowired
        private UserService userService;
    
        @Test
        public void test() {
        
            userService.save();
        }
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 53]  
运行成功  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6JOd55uS5a2QaXRibHVlYm94_size_20_color_FFFFFF_t_70_g_se_x_16 54]

### 5、知识要点 ###

Spring集成Junit步骤

导入spring集成Junit的坐标  
使用@Runwith注解替换原来的运行期  
使用@ContextConfiguration指定配置文件或配置类  
使用@Autowired注入需要测试的对象  
创建测试方法进行测试

[Java_Spring_IDEA_Spring_IoC_DI]: https://code100.blog.csdn.net/article/details/120253289
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