spring IOC容器管理必须知道的一些操作(基于XML方式)

<!--1 配置User对象创建-->

< bean id = "user" class = "com.atguigu.spring5.User" ></ bean >

//（1）传统方式： 创建类，定义属性和对应的set方法

public class Book {

         //创建属性

         private String bname;

         //创建属性对应的set方法

         public void setBname(String bname) {

             this .bname = bname;

         }

    }

<!--（2）spring方式： set方法注入属性-->

< bean id = "book" class = "com.atguigu.spring5.Book" >

     <!--使用property完成属性注入

         name：类里面属性名称

         value：向属性注入的值

     -->

     < property name = "bname" value = "Hello" ></ property >

     < property name = "bauthor" value = "World" ></ property >

</ bean >

//（1）传统方式：创建类，构建有参函数

public class Orders {

     //属性

     private String oname;

     private String address;

     //有参数构造

     public Orders(String oname,String address) {

         this .oname = oname;

         this .address = address;

     }

   }

<!--（2）spring方式：有参数构造注入属性-->

< bean id = "orders" class = "com.atguigu.spring5.Orders" >

     < constructor-arg name = "oname" value = "Hello" ></ constructor-arg >

     < constructor-arg name = "address" value = "China！" ></ constructor-arg >

</ bean >

<!--1、添加p名称空间在配置文件头部-->

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

        xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

        xmlns:p = "http://HdhCmsTestspringframework.org/schema/p"         <!--在这里添加一行p-->

<!--2、在bean标签进行属性注入（算是set方式注入的简化操作）-->

     < bean id = "book" class = "com.atguigu.spring5.Book" p:bname = "very" p:bauthor = "good" >

     </ bean >

< bean id = "book" class = "com.atguigu.spring5.Book" >

     <!--（1）null值-->

     < property name = "address" >

         < null /> <!--属性里边添加一个null标签-->

     </ property >

     <!--（2）特殊符号赋值-->

      <!--属性值包含特殊符号

        a 把<>进行转义 &lt; &gt;

        b 把带特殊符号内容写到CDATA

       -->

         < property name = "address" >

             < value > <![CDATA[<<南京>>]]> </ value >

         </ property >

</ bean >

public class UserService { //service类

     //创建UserDao类型属性，生成set方法

     private UserDao userDao;

     public void setUserDao(UserDao userDao) {

         this .userDao = userDao;

     }

     public void add() {

         System.out.println( "service add..............." );

         userDao.update(); //调用dao方法

     }

}

public class UserDaoImpl implements UserDao { //dao类

     @Override

     public void update() {

         System.out.println( "dao update..........." );

     }

}

<!--1 service和dao对象创建-->

< bean id = "userService" class = "com.atguigu.spring5.service.UserService" >

     <!--注入userDao对象

         name属性：类里面属性名称

         ref属性：创建userDao对象bean标签id值

     -->

     < property name = "userDao" ref = "userDaoImpl" ></ property >

</ bean >

< bean id = "userDaoImpl" class = "com.atguigu.spring5.dao.UserDaoImpl" ></ bean >

//部门类

public class Dept {

     private String dname;

     public void setDname(String dname) {

         this .dname = dname;

     }

}

//员工类

public class Emp {

     private String ename;

     private String gender;

     //员工属于某一个部门，使用对象形式表示

     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;

     }

}

<!--内部bean-->

     < bean id = "emp" class = "com.atguigu.spring5.bean.Emp" >

         <!--设置两个普通属性-->

         < property name = "ename" value = "Andy" ></ property >

         < property name = "gender" value = "女" ></ property >

         <!--设置对象类型属性-->

         < property name = "dept" >

             < bean id = "dept" class = "com.atguigu.spring5.bean.Dept" > <!--内部bean赋值-->

                 < property name = "dname" value = "宣传部门" ></ property >

             </ bean >

         </ property >

     </ bean >

<!--方式一：级联赋值-->

     < bean id = "emp" class = "com.atguigu.spring5.bean.Emp" >

         <!--设置两个普通属性-->

         < property name = "ename" value = "Andy" ></ property >

         < property name = "gender" value = "女" ></ property >

         <!--级联赋值-->

         < property name = "dept" ref = "dept" ></ property >

     </ bean >

     < bean id = "dept" class = "com.atguigu.spring5.bean.Dept" >

         < property name = "dname" value = "公关部门" ></ property >

     </ bean >

//方式二：生成dept的get方法（get方法必须有！！）

    public Dept getDept() {

        return dept;

    }

<!--级联赋值-->

    < bean id = "emp" class = "com.atguigu.spring5.bean.Emp" >

        <!--设置两个普通属性-->

        < property name = "ename" value = "jams" ></ property >

        < property name = "gender" value = "男" ></ property >

        <!--级联赋值-->

        < property name = "dept" ref = "dept" ></ property >

        < property name = "dept.dname" value = "技术部门" ></ property >

    </ bean >

    < bean id = "dept" class = "com.atguigu.spring5.bean.Dept" >

    </ bean >

//（1）创建类，定义数组、list、map、set 类型属性，生成对应 set 方法

public class Stu {

     //1 数组类型属性

     private String[] courses;

     //2 list集合类型属性

     private List<String> list;

     //3 map集合类型属性

     private Map<String,String> maps;

     //4 set集合类型属性

     private Set<String> sets;

     public void setSets(Set<String> sets) {

         this .sets = sets;

     }

     public void setCourses(String[] courses) {

         this .courses = courses;

     }

     public void setList(List<String> list) {

         this .list = list;

     }

     public void setMaps(Map<String, String> maps) {

         this .maps = maps;

     }

<!--（2）在 spring 配置文件进行配置-->

     < bean id = "stu" class = "com.atguigu.spring5.collectiontype.Stu" >

         <!--数组类型属性注入-->

         < property name = "courses" >

             < array >

                 < value >java课程</ value >

                 < value >数据库课程</ value >

             </ array >

         </ property >

         <!--list类型属性注入-->

         < property name = "list" >

             < list >

                 < value >张三</ value >

                 < value >小三</ value >

             </ list >

         </ property >

         <!--map类型属性注入-->

         < property name = "maps" >

             < map >

                 < entry key = "JAVA" value = "java" ></ entry >

                 < entry key = "PHP" value = "php" ></ entry >

             </ map >

         </ property >

         <!--set类型属性注入-->

         < property name = "sets" >

             < set >

                 < value >MySQL</ value >

                 < value >Redis</ value >

             </ set >

         </ property >

</ bean >

//学生所学多门课程

   private List<Course> courseList; //创建集合

   public void setCourseList(List<Course> courseList) {

       this .courseList = courseList;

   }

<!--创建多个course对象-->

< bean id = "course1" class = "com.atguigu.spring5.collectiontype.Course" >

     < property name = "cname" value = "Spring5框架" ></ property >

</ bean >

< bean id = "course2" class = "com.atguigu.spring5.collectiontype.Course" >

     < property name = "cname" value = "MyBatis框架" ></ property >

</ bean >

<!--注入list集合类型，值是对象-->

    < property name = "courseList" >

        < list >

            < ref bean = "course1" ></ ref >

            < ref bean = "course2" ></ ref >

        </ list >

    </ property >

<!--第一步：在 spring 配置文件中引入名称空间 util-->

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

        xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

        xmlns:util = "http://HdhCmsTestspringframework.org/schema/util" <!--添加util名称空间-->

        xsi:schemaLocation="http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd

                            http://HdhCmsTestspringframework.org/schema/util http://HdhCmsTestspringframework.org/schema/util/spring-util.xsd">  <!--添加util名称空间-->

<!--第二步：使用 util 标签完成 list 集合注入提取-->

<!--把集合注入部分提取出来-->

  <!--1 提取list集合类型属性注入-->

     < util:list id = "bookList" >

         < value >易筋经</ value >

         < value >九阴真经</ value >

         < value >九阳神功</ value >

     </ util:list >

  <!--2 提取list集合类型属性注入使用-->

     < bean id = "book" class = "com.atguigu.spring5.collectiontype.Book" scope = "prototype" >

         < property name = "list" ref = "bookList" ></ property >

     </ bean >