Bean作用域的配置以及 Spring各种注入方式实例 list set map props

1.Bean有两种作用域属性，singleton 和 prototype ，默认为前者。对于singleton，当请求的 Bean 相同时，则不再重新生成新的实例化对象，通常应用程序中的组多组件都只需要一个实例就足够了。而 prototype ，用于每次返回 Bean 的一个新的实例，例如需要获取系统实时时间。

<bean id="mydate" class="com.lihui.MyDate" scope="prototype"></bean>

 

2.各种注入方式

所有的注入方式在Spring.xml 文件中配置如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans
 3     xmlns="http://www.springframework.org/schema/beans"
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5     xmlns:p="http://www.springframework.org/schema/p"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 7 
 8     <!-- 注入基本类型 -->
 9     <bean id="person" class="com.lihui.Person">
10         <property name="name" value="张三"></property>
11         <property name="password" value="hello"></property>
12         <property name="chock" value="true"></property>
13     </bean>
14     
15     <!-- 注入list类型和数组类型-->
16     <bean id="beansDemoClass" class="com.lihui.BeansDemoClass">
17         <property name="fruit">
18             <list>
19                 <value>荔枝</value>
20                 <value>桔子</value>
21                 <value>樱桃</value>
22             </list>
23         </property>
24         <property name="num">
25             <list>
26                 <value>20</value>
27                 <value>45</value>
28                 <value>12</value>
29             </list>
30         </property>
31     </bean>
32      
33     <!-- 注入引用类型 -->
34     <bean id="mydate" class="com.lihui.MyDate" scope="prototype">
35         <property name="date" ref="refdate"></property>
36     </bean>
37     <bean id="refdate" class="java.util.Date" scope="prototype"></bean>
38     
39     <!-- 注入 set map props 类型 -->
40     <bean id="gatherDemp" class="com.lihui.SetMapProps">
41         <property name="scoreMap">
42             <map>
43                 <!-- map 必须是 key-value 对应的 -->
44                 <entry key="Maths">
45                     <value>98</value>
46                 </entry>
47                 <entry key="English">
48                     <value>95</value>
49                 </entry>
50             </map>
51         </property>
52         <property name="properties">
53             <!-- 定义 properties 属性 -->
54             <props>
55                 <!-- props 必须是 key-value 对应的 -->
56                 <prop key="path">C:/MyDocument/MyMusic</prop>
57                 <prop key="filename">lihui.txt</prop>
58             </props>
59         </property>
60         <property name="settest">
61             <set>
62                 <!-- set元素，使用value、bean、ref 等指定系列值 -->
63                 <value>set值</value>
64             </set>
65         </property>
66     </bean>
67 </beans>

 

（1）基本注入方式

person.java

 1 public class Person {
 2     public String name;
 3     public String password;
 4     public boolean islogin;
 5     
 6     public void setName(String name){
 7         this.name = name;
 8     }
 9     public void setPassword(String password){
10         this.password = password;
11     }
12     public void setChock(boolean islogin){
13         this.islogin = islogin;
14     }
15 }

调用方法：

1 public static void main(String[] args) {
2         XmlBeanFactory bFactory = new XmlBeanFactory(new ClassPathResource(
3                 "Spring.xml"));
4         Person person = (Person) bFactory.getBean("person");
5         System.out.println("姓名：" + person.name + "  密码：" + person.password
6                 + "  状态：" + person.islogin);        
7     }

（2）注入引用类型

MyDate.java

1 public class MyDate {
2     private Date date;
3     public void setDate(Date date){
4         this.date = date;
5     }
6     public void getDate(){
7         System.out.println(date);
8     }
9 }

应用举例：

 1 public static void main(String[] args) {
 2         XmlBeanFactory bFactory = new XmlBeanFactory(new ClassPathResource("Spring.xml"));
 3         MyDate myDate = (MyDate)bFactory.getBean("mydate");
 4         myDate.getDate();
 5         try {
 6             Thread.sleep(1000);
 7         } catch (InterruptedException e) {
 8             // TODO Auto-generated catch block
 9             e.printStackTrace();
10         }
11         ((MyDate)bFactory.getBean("mydate")).getDate();                
12     }

（3）注入list类型和数组类型

BeansDemoClass.java

 1 public class BeansDemoClass {
 2     public List<String> fruit;
 3     public int[] num;
 4     public void setFruit(List<String> fruit){
 5         this.fruit = fruit;
 6         for(String f : fruit){
 7             System.out.println(f);
 8         }
 9     }
10     public void setNum(int[] num){
11         this.num = num;
12         for(int n : num){
13             System.out.println(n);
14         }
15     }
16 }

应用举例：

1 public static void main(String[] args) {
2         XmlBeanFactory bFactory = new XmlBeanFactory(new ClassPathResource("Spring.xml"));
3         BeansDemoClass bDemoClass = (BeansDemoClass)bFactory.getBean("beansDemoClass");
4         System.out.println(bDemoClass.fruit + "   " + bDemoClass.num);            
5     }

（4）注入set、map 及 props 类型
SetMapProps.java

 1 public class SetMapProps {
 2     public Map scoreMap = new HashMap<String, String>();
 3     public Properties properties = new Properties();
 4     public Set settest = new HashSet<String>();
 5     public void setScoreMap(Map scoreMap){
 6         this.scoreMap = scoreMap;
 7         System.out.println(this.scoreMap.get("English"));
 8     }
 9     public void setProperties(Properties properties){
10         this.properties = properties;
11         System.out.println(this.properties.get("path"));
12         System.out.println(this.properties.get("filename"));
13     }
14     public void setSettest(Set settest){
15         this.settest = settest;
16         System.out.println(settest.toString());
17     }
18 }

应用：

1 public static void main(String[] args) {
2         XmlBeanFactory bFactory = new XmlBeanFactory(new ClassPathResource("Spring.xml"));
3         SetMapProps beans = (SetMapProps) bFactory.getBean("gatherDemp");
4                 
5     }