标签：lan type array com 方式 中国 use import 环境搭建
<bean id="user" class="com.wang.pojo.User">
<!--方式一-->
<!-- <constructor-arg index="0" value="王野"/>-->
<!--方式二,不建议使用，如果有多个参数，-->
<!-- <constructor-arg type="java.lang.String" value="邢敏"/>-->
<constructor-arg name="name" value="hfsdjhflkads"/>
</bean>
依赖注入：Set注入
依赖: bean对象的创建依赖于容器
注入：bean对象中的所有属性，由容器来注入
【环境搭建】
复杂类型
真实测试对象
测试pojo类 :
Address.java
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Student.java
package com.wang.pojo;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class Student {
private String name;
private Address address;
private String[] books;
private List<String> hobbys;
private Map<String,String> card;
private Set<String> games;
private String wife;
private Properties info;
public void setName(String name) {
this.name = name;
}
public void setAddress(Address address) {
this.address = address;
}
public void setBooks(String[] books) {
this.books = books;
}
public void setHobbys(List<String> hobbys) {
this.hobbys = hobbys;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
public void setGames(Set<String> games) {
this.games = games;
}
public void setWife(String wife) {
this.wife = wife;
}
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);
}
}
1、常量注入
<bean id="student" class="com.wang.pojo.Student">
<property name="name" value="小明"/>
</bean>
测试：
@Test
public void test01(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Student student = (Student) context.getBean("student");
System.out.println(student.getName());
}
2、Bean注入
注意点：这里的值是一个引用，ref
<bean id="addr" class="com.kuang.pojo.Address">
<property name="address" value="重庆"/>
</bean>
<bean id="student" class="com.kuang.pojo.Student">
<property name="name" value="小明"/>
<property name="address" ref="addr"/>
</bean>
3、数组注入
<bean id="student" class="com.wang.pojo.Student">
<property name="name" value="小明"/>
<property name="address" ref="addr"/>
<property name="books">
<array>
<value>西游记</value>
<value>红楼梦</value>
<value>水浒传</value>
</array>
</property>
</bean>
4、List注入
<property name="hobbys">
<list>
<value>听歌</value>
<value>看电影</value>
<value>爬山</value>
</list>
</property>
5、Map注入
<property name="card">
<map>
<entry key="中国邮政" value="456456456465456"/>
<entry key="建设" value="1456682255511"/>
</map>
</property>
6、set注入
<property name="games">
<set>
<value>LOL</value>
<value>BOB</value>
<value>COC</value>
</set>
</property>
7、Null注入
<property name="wife"><null/></property>
8、Properties注入
<property name="info">
<props>
<prop key="学号">20234343</prop>
<prop key="性别">男</prop>
<prop key="姓名">小fd</prop>
</props>
</property>
记得有参构造和无参构造器写上
1、P命名空间注入 : 需要在头文件中加入约束文件
导入约束 : xmlns:p="http://www.springframework.org/schema/p"
<!--P(属性: properties)命名空间 , 属性依然要设置set方法-->
<bean id="user" class="com.kuang.pojo.User" p:name="hh" p:age="18"/>
2、c 命名空间注入 : 需要在头文件中加入约束文件
导入约束 : xmlns:c="http://www.springframework.org/schema/c"
<!--C(构造: Constructor)命名空间 , 属性依然要设置set方法-->
<bean id="user" class="com.kuang.pojo.User" c:name="oo" c:age="18"/>
Idea可以自动导入约束
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("userbeans.xml");
User user = context.getBean("user", User.class);
System.out.println(user);
}
@Test
public void test1(){
ApplicationContext context = new ClassPathXmlApplicationContext("userbeans.xml");
User user = context.getBean("user2", User.class);
System.out.println(user);
}
DI 依赖注入(Dependency Injection)【spring基础】
标签：lan type array com 方式 中国 use import 环境搭建
原文地址：https://www.cnblogs.com/IanIan/p/14325263.html
