❤️Spring注入集合
.以下是一些Spring常用的注入集合，请“食用”，记得给个三连噢！
如果需要传递类似于 Java Collection 类型的值，例如 List、Set、Map 和 properties，可以使用 Spring 提供的集合配置标签，如下表所示。
标签 | 说明 |
list | 用于注入 list 类型的值，允许重复 |
set | 用于注入 set 类型的值，不允许重复 |
map | 用于注入 key-value 的集合，其中 key-value 可以是任意类型 |
props | 用于注入 key-value 的集合，其中 key-value 都是字符串类型 |
String name;
Address address;
String[] books;
List<String> hobbys;
Map<String,String> card;
Set<String> games;
String wife;
Properties info;
❤️示例
下面使用 IDEA 演示如何注入集合，步骤如下：
- 创建 SpringDemo 项目，并在 src 目录下创建包。
- 添加相应的 jar 包，可以参考《第一个Spring程序》一节。
- 在所包下创建 Address、Student 类。
- 在 src 目录下创建 Spring 配置文件 beans.xml。
- 运行 SpringDemo 项目。
❤️源码
❤️1、实体类
address类
package com.kk.pojo;
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Address{" +
"address='" + address + '\'' +
'}';
}
}
Student类
package com.kk.pojo;
import java.util.*;
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 Student() {
}
public Student(String name, Address address, String[] books,
List<String> hobbys, Map<String, String> card,
Set<String> games, String wife, Properties info) {
this.name = name;
this.address = address;
this.books = books;
this.hobbys = hobbys;
this.card = card;
this.games = games;
this.wife = wife;
this.info = 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<String> getHobbys() {
return hobbys;
}
public void setHobbys(List<String> hobbys) {
this.hobbys = hobbys;
}
public Map<String, String> getCard() {
return card;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
public Set<String> getGames() {
return games;
}
public void setGames(Set<String> 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;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", address=" + address.toString() +
", books=" + Arrays.toString(books) +
", hobbys=" + hobbys +
", card=" + card +
", games=" + games +
", wife='" + wife + '\'' +
", info=" + info +
'}';
}
}
❤️ 2、beans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="address" class="com.kk.pojo.Address">
<property name="address" value="广东"></property>
</bean>
<bean id="student" class="com.kk.pojo.Student">
<!-- 第一种：普通值注入 使用value值注入-->
<property name="name" value="火神"></property>
<!-- 第二种：Bean注入 ，使用ref注入-->
<property name="address" ref="address"></property>
<!-- 数组注入，-->
<property name="books">
<array>
<value>红楼梦</value>
<value>西游记</value>
<value>三国演义</value>
<value>水浒传</value>
</array>
</property>
<!-- list注入-->
<property name="hobbys">
<list>
<value>编程</value>
<value>听歌</value>
<value>吃</value>
</list>
</property>
<!-- map注入-->
<property name="card">
<map>
<entry key="身份证" value="4412002121223***"></entry>
<entry key="银行卡" value="654645454546"></entry>
</map>
</property>
<!-- set注入-->
<property name="games">
<set>
<value>LOL</value>
<value>CSOL</value>
</set>
</property>
<!-- wife注入-->
<property name="wife">
<null></null>
</property>
<!-- Properties-->
<property name="info">
<props>
<prop key="学号">2011***</prop>
<prop key="性别">男</prop>
<prop key="姓名">k</prop>
<prop key="password">123456</prop>
</props>
</property>
</bean>
</beans>
❤️3、测试类
import com.kk.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Student student =(Student) context.getBean("student");
System.out.println(student.toString());
}
}
❤️其他方式注入
实体类：
package com.kk.pojo;
public class User {
private int age;
private String name;
//c命名空间需要有参构造器
public User(int age, String name) {
this.age = age;
this.name = name;
}
public User() {
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"age=" + age +
", name='" + name + '\'' +
'}';
}
}
1、P命名空间注入 : 需要在头文件中加入约束文件
<!--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="kk" p:age="17"/>
测试类：
@Test
public void test2(){
ApplicationContext context = new ClassPathXmlApplicationContext("userbeans.xml");
// User user =(User) context.getBean("user");
User user = context.getBean("user", User.class);
System.out.println(user);
}
2、c 命名空间注入 : 需要在头文件中加入约束文件
<!--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="kk" c:age="17"/>
测试类：
