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依赖 : 指Bean对象的创建依赖于容器 . Bean对象的依赖资源
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注入 : 指Bean对象所依赖的资源 , 由容器来设置和装配
有参构造器注入，前文有具体的讲解，此处给出代码实例
set注入（重点）
要求被注入的属性 , 必须有set方法 , set方法的方法名由set + 属性首字母大写 , 如果属性是boolean类型 , 没有set方法 , 是 is
编写pojo类：
Address.java
package com.pag.pojo;
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Student.java
package com.pag.pojo;
import java.util.List;
import java.util.*;
public class Student {
private String name;
private Address address;
private String[] books;
private List hobbys;
private Map card;
private Set games;
private String wife;
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 getHobbys() {
return hobbys;
}
public void setHobbys(List hobbys) {
this.hobbys = hobbys;
}
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 getWife() {
return wife;
}
public void setWife(String wife) {
this.wife = wife;
}
public Properties getInfo() {
return info;
}
public void setInfo(Properties info) {
this.info = info;
}
public void show(){
System.out.println("name="+ name
+ ",address="+ address.getAddress()
+ ",books="
);
for (String book:books){
System.out.print("<<"+book+">>t");
}
System.out.println("n爱好:"+hobbys);
System.out.println("card:"+card);
System.out.println("games:"+games);
System.out.println("wife:"+wife);
System.out.println("info:"+info);
}
}
常量注入
测试类：
@Test
public void test1(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getName());
}
Bean注入
测试类：
@Test
public void test2(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getAddress().getAddress());
}
数组注入
spring java c
测试类：
@Test
public void test3(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
for (String s : student.getBooks()) {
System.out.println(s);
}
}
List注入
sing song read book
测试类：
@Test
public void test4(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
for (String s : student.getHobbys()) {
System.out.println(s);
}
}
Map注入
测试类：
@Test
public void test5(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getCard());
}
Set注入
LOL DND COD
测试类：
@Test
public void test6(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getGames());
}
Null注入
测试类：
@Test
public void test7(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getWife());
}
Properties注入
20210101 林而异 男
测试类：
@Test
public void test8(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = context.getBean("student", Student.class);
System.out.println(student.getInfo());
}
拓展注入实现
创建一个User实体类：
package com.pag.pojo;
public class User {
private String name;
private int age;
public User() {
System.out.println("无参");
}
public User(String name, int age) {
this.name = name;
this.age = age;
System.out.println("有参");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"name='" + name + ''' +
", age=" + age +
'}';
}
}
p命名空间注入
需要在头文件中假如约束文件
xmlns:p="http://www.springframework.org/schema/p"
测试类：
@Test
public void test10(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
User user = context.getBean("user", User.class);
System.out.println(user.toString());
}
运行结果：
结果证明，p命名空间注入调用的是无参构造方法，使用set方法将参数传输到对象中
c命名空间注入xmlns:c="http://www.springframework.org/schema/c"
运行结果：
结果证明，c命名空间注入调用的是有参构造方法，c 就是所谓的构造器注入
