spring的注入方式
给bean注入值
1、构造函数注入(类中需定义对应的构造器)
使用参数名：
argValue
或者：
·注入集合对象
张三
西红柿
·类似的还有
lisi
依赖注入
1、引用已定义的bean：
或者：
注：bean属性指明目标bean的ID。
2、使用内部bean ：
整体代码演示如下
pom.xml坐标的配置：
com.lmm
Spring_demo1
1.0-SNAPSHOT
org.springframework
spring-context
5.0.0.RELEASE
org.springframework
spring-test
5.0.0.RELEASE
test
org.springframework
spring-core
5.0.0.RELEASE
org.springframework
spring-web
5.0.0.RELEASE
org.springframework
spring-beans
5.0.0.RELEASE
commons-logging
commons-logging
1.2
org.springframework
org.springframework.context.support
3.2.2.RELEASE
junit
junit
4.12
test
spring-bean.xml的配置（主要）
高三泥
美食
电影
睡觉
听歌
实体类（两个）
public class User {
private int id;
private String username;
private String sex;
private Date birthday;
private String address;
private List hobbys;//爱好
private Map phones;//手机号
public User() {
}
public User(int id) {
this.id = id;
}
public User(String username) {
this.username = username;
}
public User(int id, String username) {
this.id = id;
this.username = username;
}
public User(String username, String sex) {
this.username = username;
this.sex = sex;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public List getHobbys() {
return hobbys;
}
public void setHobbys(List hobbys) {
this.hobbys = hobbys;
}
public Map getPhones() {
return phones;
}
public void setPhones(Map phones) {
this.phones = phones;
}
/**
* 通过配置，让该方法在对象初始化的时候自动执行
*/
public void init(){
System.out.println("我被初始化了");
}
/**
* 通过配置，让该方法在对象销毁的时候自动执行
*/
public void destory(){
System.out.println("我被销毁了");
}
/* @Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
", address='" + address + '\'' +
'}';
}*/
}
public class Account {
private int aid;
private double money;
private User user;
public Account() {
}
public Account(int aid, double money, User user) {
this.aid = aid;
this.money = money;
this.user = user;
}
public int getAid() {
return aid;
}
public void setAid(int aid) {
this.aid = aid;
}
public double getMoney() {
return money;
}
public void setMoney(double money) {
this.money = money;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
测试类的实现：
public class UserTest {
@Test
public void testUser(){
//获取配置文件spring-bean.xml
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-bean.xml");
//获取User实例
User user = (User)context.getBean("user");//对应的就是spring-bean.xml中对应的id
user.setUsername("刘昊东");
System.out.println(user.getUsername());
User user1 = (User)context.getBean(User.class);
System.out.println(user1.getUsername());
System.out.println(user==user1);
}
@Test
public void testUser2(){
//获取配置文件spring-bean.xml
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-bean.xml");
//获取User实例
User user = (User)context.getBean("user");//对应的就是spring-bean.xml中对应的id
System.out.println(user.getUsername());
System.out.println(user.getId());
}
@Test
public void testUser3(){
//获取配置文件spring-bean.xml
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-bean.xml");
//获取User实例
User user = (User)context.getBean("user1");//对应的就是spring-bean.xml中对应的id
System.out.println(user.getUsername());
System.out.println(user.getSex());
}
@Test
public void testUser4(){
//获取配置文件spring-bean.xml
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-bean.xml");
//获取User实例
Account account = (Account) context.getBean("account");//对应的就是spring-bean.xml中对应的id
System.out.println(account.getAid());
System.out.println(account.getUser().getUsername());
System.out.println(account.getUser().getAddress());
//爱好
List hobbys = account.getUser().getHobbys();
for (String hobby : hobbys) {
System.out.println(hobby);
}
//手机号
Map phones = account.getUser().getPhones();
Set key = phones.keySet();
for (String s : key) {
System.out.println(s+":"+phones.get(s));
}
}
}