IOC操作Bean管理（xml注入其他类型属性）

心已赠人 2024-04-07 14:11 44阅读 0赞

### 1.字面量 ###

a.null值

添加属性，提供set方法，提供输出
    private String address;
    
    public void setAddress(String address) {
            this.address = address;
        }
    
    public void testDemo(){
            System.out.println(bname+"::"+bauthor+"::"+address);
        }
    
    
    
        <bean id="book" class="cn.xs.spring.Book">
            
            <property name="bname" value="活着"></property>
            <property name="bauthor" value="余华"></property>
            
            <property name="address">
                <null/>
            </property>
    
        </bean>
    
    
    
    测试
    
    
    
    @Test
        public void testBook() {
            //1 加载配置文件
            ApplicationContext context = new ClassPathXmlApplicationContext("Spring.xml");
            //2 获取配置创建的对象
            Book book = context.getBean("book", Book.class);
            //System.out.println(book);
            book.testDemo();
        }

b.属性值包含特殊符号

添加属性，提供set方法，提供输出
    private String address;
    
    public void setAddress(String address) {
            this.address = address;
        }
    
    public void testDemo(){
            System.out.println(bname+"::"+bauthor+"::"+address);
        }
    
    
    
        <bean id="book" class="cn.xs.spring.Book">
            
            <property name="bname" value="活着"></property>
            <property name="bauthor" value="余华"></property>
    
    
           
        <property name="address">
            <value><![CDATA[<<南京>>]]></value>
        </property>
    
    
        </bean>
    
    
    
    测试
    
    
    
    @Test
        public void testBook() {
            //1 加载配置文件
            ApplicationContext context = new ClassPathXmlApplicationContext("Spring.xml");
            //2 获取配置创建的对象
            Book book = context.getBean("book", Book.class);
            //System.out.println(book);
            book.testDemo();
        }

### 2.注入属性---外部Bean ###

a.创建service类和dao类

b.在Spring中调用dao层的方法

public interface UserDao {
        public void update();
    }
    
    public class UserDaoImpl implements UserDao{
        @Override
        public void  update(){
            System.out.println("update.......................");
        }
    }
    
    public class UserService {
        private UserDao userDao;
        public void setUserDao(UserDao userDao) {
            this.userDao = userDao;
        }
        public void  add(){
            System.out.println("add...........");
            userDao.update();
            //原始方式创建UserDao对象
    //        UserDao userdao = new UserDaoImpl();
    //        userdao.update();
        }
    }

c.在Spring配置文件中进行配置

<bean id="UserService" class="cn.xs.service.UserService">
            
            <property name="UserDao" ref="UserDaoImpl"></property>
        </bean>
        
        <bean id="UserDaoImpl" class="cn.xs.dao.UserDaoImpl"></bean>
    
    
    测试
    
    
    public class testBean {
        @Test
        public void testAdd() {
            //1 加载配置文件
            ApplicationContext context = new ClassPathXmlApplicationContext("Bean.xml");
            //2 获取配置创建的对象
            UserService UserService = context.getBean("UserService", UserService.class);
            System.out.println(UserService);
            UserService.add();
        }
    }

### 3.注入属性---内部bean和级联赋值 ###

1.一对多关系：部门跟员工

一个部门有多个员工，一个员工属于多个部门

部门是一，员工是多

2.在实体类之间表示一对多关系，员工表示所属部门，使用对象类型属性进行表示

//部门类
    public class Dept {
        private String dname;
        public void setDname(String dname) {
            this.dname = dname;
        }
    }
    
    //员工的类
    public class Emp {
        private String ename;
        private String gender;
        //员工属于某个部门，使用对象的形式表示
        private Dept dept;
        public void setDept(Dept dept) {
            this.dept = dept;
        }
        public void setEname(String ename) {
            this.ename = ename;
        }
        public void setGender(String gender) {
            this.gender = gender;
        }
    }

3.在spring中进行配置

<bean id="emp" class="cn.xs.bean.Emp">
            
            <property name="ename" value="lucy"></property>
            <property name="gender" value="女"></property>
            
            <property name="dept">
                <bean id="dept" class="cn.xs.bean.Dept">
                    <property name="dname" value="安保部"></property>
                </bean>
            </property>
        </bean>
    
    
    
     /*
        * 内部bean
        * */
        @Test
        public void testAdd1() {
            //1 加载配置文件
            ApplicationContext context = new ClassPathXmlApplicationContext("Bean1.xml");
            //2 获取配置创建的对象
            Emp emp = context.getBean("emp", Emp.class);
            emp.add();
        }

### 4.注入属性---级联赋值 ###

a.第一种写法

在spring中配置
    
    
        <bean id="emp" class="cn.xs.bean.Emp">
            
            <property name="ename" value="lucy"></property>
            <property name="gender" value="女"></property>
            
            <property name="dept" ref="dept"></property>
        </bean>
        <bean id="dept" class="cn.xs.bean.Dept">
            <property name="dname" value="逻辑部"></property>
        </bean>
    
    测试
    
    
     /*
         * 级联赋值
         * */
        @Test
        public void testAdd2() {
            //1 加载配置文件
            ApplicationContext context = new ClassPathXmlApplicationContext("Bean2.xml");
            //2 获取配置创建的对象
            Emp emp = context.getBean("emp", Emp.class);
            emp.add();
        }

b.第二种写法

需要在员工表中生成部门的get方法
    
    //员工的类
    public class Emp {
        private String ename;
        private String gender;
        //员工属于某个部门，使用对象的形式表示
        private Dept dept;
        //生成dept的get方法
        public Dept getDept() {
            return dept;
        }
    
        public void setDept(Dept dept) {
            this.dept = dept;
        }
        public void setEname(String ename) {
            this.ename = ename;
        }
        public void setGender(String gender) {
            this.gender = gender;
        }
        public void add(){
            System.out.println(ename+"::"+gender+"::"+dept);
        }
    
     
        <bean id="emp" class="cn.xs.bean.Emp">
            
            <property name="ename" value="lucy"></property>
            <property name="gender" value="女"></property>
            
            <property name="dept" ref="dept"></property>
            <property name="dept.dname" value="技术部"></property>
        </bean>
        <bean id="dept" class="cn.xs.bean.Dept">
            <property name="dname" value="逻辑部"></property>
        </bean>