• Bean管理操作有兩種方式

（1）基於 xml 配置檔案方式實現
（2）基於註解方式實現

• 基於xml配置

# 在src路徑下編寫bean.xml
<bean id="user" class="com.ychen.spring.User"></bean>

# 使用 bean 標籤，標籤裡面新增對應屬性，就可以實現物件建立
# 在 bean 標籤有很多屬性
  * id 屬性：唯一標識
  * class 屬性：類全路徑
# 建立物件時，預設執行無引數構造方法完成物件建立

# 最後通過如下方式獲取物件
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
User user = context.getBean("user", User.class);
 

• 基於xml注入屬性

DI：依賴注入，就是注入屬性

• 在實體類中使用set方法注入

# 新建1個實體類Book
public class Book {

    private String bname;

    private String bauthor;

    public void setBname(String bname) {
        this.bname = bname;
    }

    public void setBauthor(String bauthor) {
        this.bauthor = bauthor;
    }

    // main方法中測試注入屬性
    public static void main(String[] args) {
        Book book = new Book();
        book.setBauthor("goudan");
        System.out.println(book);
    }

}

# main方法中測試
com.ychen.spring.model.Book@5b464ce8

Process finished with exit code 0
 

• 基於xml配置注入屬性

# 編寫實體類
public class Book {

    private String bname;

    private String bauthor;

    private String address;

    public void setBname(String bname) {
        this.bname = bname;
    }
    public void setBauthor(String bauthor) {
        this.bauthor = bauthor;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public void testDemo() {
        System.out.println(bname+"::"+bauthor+"::"+address);
    }

}

# 編寫bean.xml
    <bean id="book" class="com.ychen.spring.model.Book">
        <property name="bname" value="易筋經"></property>
        <property name="bauthor" value="達摩老祖"></property>
    </bean>

# 編寫測試方法
    @Test
    public void testBook1() {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean1.xml");
        Book book = context.getBean("book", Book.class);
        System.out.println(book);
        book.testDemo();
    }

# 測試
com.ychen.spring.model.Book@2cb4893b
易筋經::達摩老祖::null