spring之注入参数

1，基本类型值；（就是依赖注入中的属性注入）

2，注入 bean；

3，内部 bean；

4，null 值；

5，级联属性；

6，集合类型属性

注入bean实例：

被注入的bean（dog）,注入到People中

package com.java1234.entity;

public class Dog {

private String name;

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }


}

People类

package com.java1234.entity;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public class People {

   private int id;
   private String name;
   private int age;
   private Dog dog;

private List<String> hobbies=new ArrayList<String>();
   private Set<String> loves=new HashSet<String>();
   private Map<String,String> works=new HashMap<String,String>();
   private Properties addresses=new Properties();

   public People() {
       super();
       // TODO Auto-generated constructor stub
   }




   public People(int id, String name, int age) {
       super();
       this.id = id;
       this.name = name;
       this.age = age;
   }

public Set<String> getLoves() {
return loves;
}

   public void setLoves(Set<String> loves) {
       this.loves = loves;
   }

   public List<String> getHobbies() {
       return hobbies;
   }

   public void setHobbies(List<String> hobbies) {
       this.hobbies = hobbies;
   }

   public Map<String, String> getWorks() {
       return works;
   }

   public void setWorks(Map<String, String> works) {
       this.works = works;
   }

   public Properties getAddresses() {
       return addresses;
   }

   public void setAddresses(Properties addresses) {
       this.addresses = addresses;
   }

   public Dog getDog() {
       return dog;
   }

   public void setDog(Dog dog) {
       this.dog = dog;
   }

   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   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 "People [id=" + id + ", name=" + name + ", age=" + age
               + ", dog=" + dog.getName() + ", hobbies=" + hobbies + ", loves=" + loves
               + ", works=" + works + ", addresses=" + addresses + "]";
   }

}

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.xsd">

//基本类型值
   <bean id="people1" class="com.java1234.entity.People">
       <property name="id" value="1"></property>
       <property name="name" value="张三"></property>
       <property name="age" value="11"></property>
   </bean>

//注入bean
   <bean id="people2" class="com.java1234.entity.People">
       <property name="id" value="1"></property>
       <property name="name" value="张三"></property>
       <property name="age" value="11"></property>
       <property name="dog" ref="dog1"></property>
   </bean>

//内部bean
   <bean id="people3" class="com.java1234.entity.People">
       <property name="id" value="1"></property>
       <property name="name" value="张三"></property>
       <property name="age" value="11"></property>
       <property name="dog">
           <bean class="com.java1234.entity.Dog">
               <property name="name" value="Tom"></property>
           </bean>
       </property>
   </bean>

//null值

/**

@Override
   public String toString() {
       return "People [id=" + id + ", name=" + name + ", age=" + age
               + ", dog=" + dog.getName() + "]";
   }报dog为null错误，应该改为dog=+dog+"]"

//级联属性，People中代码 private Dog dog;要改为 private Dog dog=new Dog();要不然会报dog对象不存在错误

//集合类型属性
   <bean id="people6" class="com.java1234.entity.People">
       <property name="id" value="1"></property>
       <property name="name" value="张三"></property>
       <property name="age" value="11"></property>
       <property name="dog" ref="dog1"></property>
       <property name="hobbies">
           <list>
               <value>唱歌</value>
               <value>跳舞</value>
           </list>
       </property>
       <property name="loves">
           <set>
               <value>唱歌2</value>
               <value>跳舞2</value>
           </set>
       </property>
       <property name="works">
           <map>
               <entry>
                   <key><value>上午</value></key>
                   <value>写代码</value>
               </entry>
               <entry>
                   <key><value>下午</value></key>
                   <value>测试代码</value>
               </entry>
           </map>
       </property>
       <property name="addresses">
           <props>
               <prop key="address1">aaaaa</prop>
               <prop key="address2">bbbbb</prop>
           </props>
       </property>
   </bean>

</beans>

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