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Spring属性注入DI

2015-10-20 00:00 513 查看

javabean

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package

com.mickeymouse.ioc;

public

class

Car {

private

String name;

private

Double price;

//提供构造方法

public

Car(String name, Double price) {

super

();

this

.name = name;

this

.price = price;

@Override

public

String toString() {

return

"Car [name="

+ name +

", price="

+ price +

"]"

Xml配置

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<!-- Bean的属性注入:构造方法注入 -->

<bean id=

"car"

class

"com.mickeymouse.ioc.Car"

<constructor-arg name=

"name"

value=

"宝马"

></constructor-arg>

<constructor-arg name=

"price"

value=

"4343434.0"

></constructor-arg>

</bean>

测试类

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/**

* 属性注入之构造方法注入

*/

@Test

public

void

test5(){

//获取配置文件

String path =

"applicationContext.xml"

//加载配置文件

AbstractApplicationContext applicationContext =

new

ClassPathXmlApplicationContext(path);

Car car = (Car) applicationContext.getBean(

"car"

);

System.out.println(car);

结果:

2 . set方法注入(只需提供set方法)

javabean:

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package

com.mickeymouse.ioc;

public

class

Car {

private

String name;

private

Double price;

public

String getName() {

return

name;

public

void

setName(String name) {

this

.name = name;

public

Double getPrice() {

return

price;

public

void

setPrice(Double price) {

this

.price = price;

@Override

public

String toString() {

return

"Car [name="

+ name +

", price="

+ price +

"]"

配置文件

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<!-- Bean的属性注入:Set方法注入 -->

<bean id=

"car"

class

"com.mickeymouse.ioc.Car"

<property name=

"name"

value=

"兰博基尼"

/>

<property name=

"price"

value=

"3423432.0"

/>

</bean>

测试类:

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/**

* 属性注入之set方法注入

*/

@Test

public

void

test6(){

//获取配置文件

String path =

"applicationContext.xml"

//加载配置文件

AbstractApplicationContext applicationContext =

new

ClassPathXmlApplicationContext(path);

Car car = (Car) applicationContext.getBean(

"car"

);

System.out.println(car);

结果图

一 . 引入P名称空间:

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<?

xml

version

"1.0"

encoding

"UTF-8"

?>

beans

xmlns

"http://www.springframework.org/schema/beans"

xmlns:p

"http://www.springframework.org/schema/p"

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">

<!-- bean definitions here -->

<!-- Bean的属性注入:p名称空间注入 -->

bean

id

"car"

class

"com.mickeymouse.ioc.Car"

p:name

"长安宝马"

p:price

"432423.5"

></

bean

</

beans

二 . javabean

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package

com.mickeymouse.ioc;

public

class

Car {

private

String name;

private

Double price;

public

String getName() {

return

name;

public

void

setName(String name) {

this

.name = name;

public

Double getPrice() {

return

price;

public

void

setPrice(Double price) {

this

.price = price;

@Override

public

String toString() {

return

"Car [name="

+ name +

", price="

+ price +

"]"

测试类

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/**

* 属性注入之P名称空间注入

*/

@Test

public

void

test7(){

//获取配置文件

String path =

"applicationContext.xml"

//加载配置文件

AbstractApplicationContext applicationContext =

new

ClassPathXmlApplicationContext(path);

Car car = (Car) applicationContext.getBean(

"car"

);

System.out.println(car);

结果图:

4 . Bean属性注入之 SPEL表达式方式--->sping3.0以后才开始出现
javabean:

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package

com.mickeymouse.ioc;

public

class

Car {

private

String name;

private

Double price;

public

String getName() {

return

name;

public

void

setName(String name) {

this

.name = name;

public

Double getPrice() {

return

price;

public

void

setPrice(Double price) {

this

.price = price;

@Override

public

String toString() {

return

"Car [name="

+ name +

", price="

+ price +

"]"

XML表达式:

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<!-- Bean的属性注入:SPEL表达式方式 -->

bean

id

"car"

class

"com.mickeymouse.ioc.Car"

property

name

"name"

value

"#{'劳斯莱斯'}"

/>

property

name

"price"

value

"#{3434.00}"

/>

</

bean

测试类

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/**

* 属性注入之SPEL表达式注入

*/

@Test

public

void

test8(){

//获取配置文件

String path =

"applicationContext.xml"

//加载配置文件

AbstractApplicationContext applicationContext =

new

ClassPathXmlApplicationContext(path);

Car car = (Car) applicationContext.getBean(

"car"

);

System.out.println(car);

结果

XML关于数组,集合(list map set properties)的属性赋值配置写法:

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<bean id=

"collectionBean"

class

"com.itheima.spring.demo6.CollectionBean"

<property name=

"arrs"

<list>

<value>老王</value>

<value>凤姐</value>

<value>如花</value>

</list>

</property>

<property name=

"list"

<list>

<value>豆豆</value>

<value>奶茶</value>

<value>绿茶</value>

</list>

</property>

<property name=

"set"

<set>

<value>王尧</value>

<value>刘健</value>

<value>周玉</value>

</set>

</property>

<property name=

"map"

<map>

<entry key=

"老王2"

value=

"38"

/>

<entry key=

"凤姐"

value=

"38"

/>

<entry key=

"如花"

value=

"29"

/>

</map>

</property>

<property name=

"properties"

<props>

<prop key=

"username"

>root</prop>

<prop key=

"password"

</prop>

</props>

</property>

</bean>

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