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依赖注入

• 依赖：依赖于spring容器
• 注入：对于创建的对象，可以对其属性进行注入，或者注入其他对象

构造器注入

set方式注入【重点】

pojo

public class Student {       private String name;    private Address address;    private String[] books;    private List
   
     hobbies;    private Map
    
      card;    private Set
     
       games;    private String bf;    private Properties info;    public String getName() {           return name;    }    public void setName(String name) {           this.name = name;    }    public Address getAddress() {           return address;    }    public void setAddress(Address address) {           this.address = address;    }    public String[] getBooks() {           return books;    }    public void setBooks(String[] books) {           this.books = books;    }    public List
      
        getHobbies() {           return hobbies;    }    public void setHobbies(List
       
         hobbies) {           this.hobbies = hobbies;    }    public Map
        
          getCard() { return card; } public void setCard(Map
         
           card) { this.card = card; } public Set
          
            getGames() { return games; } public void setGames(Set
           
             games) { this.games = games; } public String getBf() { return bf; } public void setBf(String bf) { this.bf = bf; } public Properties getInfo() { return info; } public void setInfo(Properties info) { this.info = info; } @Override public String toString() { return "Student{" + "name='" + name + '\'' + ", address=" + address + ", books=" + Arrays.toString(books) + ", hobbies=" + hobbies + ", card=" + card + ", games=" + games + ", bf='" + bf + '\'' + ", info=" + info + '}'; }}
           
          
         
        
       
      
     
    
   

beans.xml

   
       
            
         
        
    
             
     
             
     
             
                 
                      
       
        水浒传
                       
       
        红楼梦
                       
       
        三国演义
                       
       
        西游记
                   
              
     
             
                 
                      
       
        code
                       
       
        code
                       
       
        code
                   
              
     
             
                 
              
     
             
                 
                      
       
        lol
                       
       
        eat chicken
                   
              
     
             
                 
              
     
             
                 
                      
       
        ...
                       
       
        ...
                       
       
        ...
                       
       
        ...
                   
              
         
    
   

test

public class MyTest {       public static void main(String[] args) {           ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");        Student student = (Student) context.getBean("student");        System.out.println(student);/** Student{ name='www', address=Address{address='sh'}, books=[水浒传, 红楼梦, 三国演义, 西游记], hobbies=[code, code, code], card={身份证=..., 银行卡=...}, games=[lol, eat chicken], bf='null', info={password=..., url=..., driver=..., username=...}} **/    }}

扩展方式注入

p命名空间和c命名空间

如有不对的地方欢迎指出，共同进步！