IntelliJ IDEA 2017版 Spring5最基本的bean例子创建

一、简述

        SpringBoot是基于spring框架之上的快速开发的框架.Spring4核心就是容器,容器提供了对bean的装配和管理.

      spring依赖加载:

     http://search.maven.org/#search%7Cga%7C1%7Cspring-context

       搜索:spring-context:如图:
              

粘贴到pom文档中

POM文档:

 <?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.study.spring</groupId>
     <artifactId>spring4</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>war</packaging>

     <name>spring4</name>
     <description>Demo project for Spring Boot</description>
     <url>http://maven.apache.org</url>
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.0.1.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

         <!--修改编译级别为1.8-->
         <maven.compiler.source>1.8</maven.compiler.source>
         <mavne.compiler.target>1.8</mavne.compiler.target>
         <java.version>1.8</java.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
             <version>5.0.5.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>org.robolectric</groupId>
             <artifactId>junit</artifactId>
             <version>3.8</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

1、编写配置文件Conf

 package com.spring4.conf;

 import com.spring4.pojo.User;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Scope;

 /**
  * Created by liuya
  *
  * @author : liuya
  *         Date: 2018/5/2
  *         Time:  23:50
  *         projectName:spring4
  *         配置类
  */

 @Configuration
 public class SpringConf {

     /**
      * 配置bean 写一个方法,返回bean
      * <p>
      * 指定名字,默认是方法名字
      */
     @Bean(name = "getUser")
     /**
      * 修改为非单例模式,创建的对象就是不一样的了
      *
      */
     @Scope(value = "prototype")
     public User getUser() {
         User user = new User();
         user.setAge(29);
         user.setUserName("王圆圆");
         user.setPassWord("1110000");

         return user;
     }

 }

2、编写bean

 package com.spring4.pojo;

 /**
  * Created by liuya
  *
  * @author : liuya
  *         Date: 2018/5/2
  *         Time:  23:52
  *         projectName:spring4
  */
 public class User {

     private String userName;

     private String passWord;

     private Integer age;

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public String getPassWord() {
         return passWord;
     }

     public void setPassWord(String passWord) {
         this.passWord = passWord;
     }

     public Integer getAge() {
         return age;
     }

     public void setAge(Integer age) {
         this.age = age;
     }

     @Override
     public String toString() {
         return "User{" +
                 "userName='" + userName + '\'' +
                 ", passWord='" + passWord + '\'' +
                 ", age=" + age +
                 '}';
     }
 }

3、Spring4Application

 package com.study.spring;

 import com.spring4.conf.SpringConf;
 import com.spring4.pojo.User;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;

 import java.io.IOException;
 import java.util.List;

 /**
  * @author liuyang
  */
 @SpringBootApplication
 public class Spring4Application {

     public static void main(String[] args) {
         // 通过Java配置来实例化Spring容器
         AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConf.class);

         // 在Spring容器中获取Bean对象
         User user = context.getBean(User.class);

         //根据名字获取(默认是根据方法名字获取)
         Object user2 = context.getBean("getUser");

         System.out.println(user.getUserName() + ", " + user.getAge() + ", " + user.getPassWord());
         System.out.println(user2.toString() + ", ");
         String list = user2.toString();
         String[] ont = list.split(",");
         for (int i = 0; i < ont.length; i++) {
             System.out.println(ont[i]);
         }
         // 销毁该容器
         context.destroy();
     }
 }