Spring学习之xml配置Bean总结

转自：http://www.cnblogs.com/hyyq/p/6701211.html

学习Spring时，我用的是Maven来管理jar包，先看看maven的pom.xml：

pom.xml

1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3   <modelVersion>4.0.0</modelVersion>
4   <groupId>spring</groupId>
5   <artifactId>spring_TencentKe_Tonggang-5</artifactId>
6   <packaging>war</packaging>
7   <version>1.4</version>
8   <name>spring_TencentKe_Tonggang-5 Maven Webapp</name>
9   <url>http://maven.apache.org</url>
10   <dependencies>
11     <dependency>
12       <groupId>junit</groupId>
13       <artifactId>junit</artifactId>
14       <version>3.8.1</version>
15       <scope>test</scope>
16     </dependency>
17     <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
18         <dependency>
19             <groupId>org.springframework</groupId>
20             <artifactId>spring-core</artifactId>
21             <version>4.3.7.RELEASE</version>
22         </dependency>
23         <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
24         <dependency>
25             <groupId>org.springframework</groupId>
26             <artifactId>spring-context</artifactId>
27             <version>4.3.7.RELEASE</version>
28         </dependency>
29         <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
30         <dependency>
31             <groupId>org.springframework</groupId>
32             <artifactId>spring-beans</artifactId>
33             <version>4.3.7.RELEASE</version>
34         </dependency>
35     <!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
36     <dependency>
37         <groupId>c3p0</groupId>
38         <artifactId>c3p0</artifactId>
39         <version>0.9.1.2</version>
40     </dependency>
41 <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
42 <dependency>
43     <groupId>mysql</groupId>
44     <artifactId>mysql-connector-java</artifactId>
45     <version>5.1.38</version>
46 </dependency>
47
48 <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
49 <dependency>
50     <groupId>org.aspectj</groupId>
51     <artifactId>aspectjweaver</artifactId>
52     <version>1.8.9</version>
53 </dependency>
54 <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
55 <dependency>
56     <groupId>org.springframework</groupId>
57     <artifactId>spring-jdbc</artifactId>
58     <version>4.3.7.RELEASE</version>
59 </dependency>
60   </dependencies>
61   <build>
62     <finalName>spring_TencentKe_Tonggang-5</finalName>
63   </build>
64 </project>

 

先看看写的三个bean:

Car.java:

package spring.beans;

public class Car {
private String cname;//车名字
private int price;//价格
private double max;//最大速度

public Car() {
super();
// TODO Auto-generated constructor stub
}
public Car(String cname, double max) {
super();
this.cname = cname;
this.max = max;
}
public Car(String cname, int price) {
super();
this.cname = cname;
this.price = price;
}
public void setCname(String cname) {
this.cname = cname;
}
public void setPrice(int price) {
this.price = price;
}
@Override
public String toString() {
return "Car [cname=" + cname + ", price=" + price + ", max=" + max + "]";
}

}

Person.java:

package spring.beans;

import java.util.List;
import java.util.Map;

public class Person {
private String Pname;//姓名
private int age;//年龄
private Car car;//一辆车
private List<Car> cars;//很多车
private Map<String, String> des;//描述

public Person() {

}

public void setDes(Map<String, String> des) {
this.des = des;
}

public void setCars(List<Car> cars) {
this.cars = cars;
}
public void setPname(String pname) {
Pname = pname;
}
public void setAge(int age) {
this.age = age;
}
public void setCar(Car car) {
this.car = car;
}
@Override
public String toString() {
return "Person [Pname=" + Pname + ", age=" + age + ", car=" + car + ", cars=" + cars + ", des=" + des + "]";
}

}

Person1.java:

package spring.beans;

import java.util.List;

public class Person1 {
private String pname;
private int age;
private List<Car> cars;
public void setPname(String pname) {
this.pname = pname;
}
public void setAge(int age) {
this.age = age;
}
public void setCars(List<Car> cars) {
this.cars = cars;
}
@Override
public String toString() {
return "Person1 [pname=" + pname + ", age=" + age + ", list=" + cars + "]";
}

}

 

xml配置中，看下面xml文件配置：

applicationContext.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"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd"> <bean id="person" class="spring.beans.Person"><!--将这个bean加入到spring的ioc容器-->
<property name="pname" value="张三"></property><!--给bean的pname属性赋值-->
<property name="age" value="20"></property>
<property name="cars" ><!--给bean中的list<Car>类型属性赋值-->
<list>
<ref bean="car1"/><!--配置第一个car-->
<ref bean="car2"/><!--配置第二个car-->
</list>
</property>
<property name="des"><!--给bean中map<String,String>类型的属性赋值-->
<map>
<entry key="a" value="a1"></entry><!--第一个值-->
<entry key="b" value="b1"></entry><!--第二个值-->
</map>
</property>
</bean>

<util:list id="cars"><!--利用util标签，配置多个car-->
<ref bean="car1"/>
<ref bean="car2"/>
</util:list>

<bean id="person1" class="spring.beans.Person1" p:pname="王五" p:age="23"
p:cars-ref="cars"></bean><!--配置bean到IOC容器，并用p标签直接给属性赋值，p:cars-ref就用到了上面的util标签中的id值-->

<bean id="car1" class="spring.beans.Car"><!--配置第一个car-->
<property name="cname" value="奥迪"></property>
<property name="price" value="300000"></property>
</bean>
<bean id="car2" class="spring.beans.Car"><!--配置第二个car-->
<property name="cname" value="长安"></property>
<property name="price" value="100000"></property>
</bean>
</beans>

测试：

package spring.beans.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import spring.beans.Person;
import spring.beans.Person1;

public class Main {

public static void main(String[] args) {
ApplicationContext cxt= new ClassPathXmlApplicationContext("applicationContext.xml");
Person p=(Person) cxt.getBean("person");
System.out.println(p);

Person1 p1=(Person1) cxt.getBean("person1");
System.out.println(p1);
}

}

输出：

Person [Pname=张三, age=20, car=null, cars=[Car [cname=奥迪, price=300000, max=0.0], Car [cname=长安, price=100000, max=0.0]], des={a=a1, b=b1}]
Person1 [pname=王五, age=23, list=[Car [cname=奥迪, price=300000, max=0.0], Car [cname=长安, price=100000, max=0.0]]]