1) Spring_HelloWorld
方式一:下载对应eclipse版本的文件,离线安装
4.4.2 springsource-tool-suite-3.6.4.RELEASE-e4.4.2-updatesite.zip 87MB
选择
- Core / Spring IDE
- Extensions / Spring IDE
- Integrations / Spring IDE
- Resources / Spring IDE
方式二:在线安装 install new sorftware - add site
2. 创建maven项目
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
</dependencies>
- spring-aop
- spring-beans
- spring-context
- spring-core
- spring-expression
- commons-logging
- aopalliance
创建IoC 容器配置文件
<?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"> <beans>
<bean id="person" class="cn.zno.hello.Person" >
<property name="name" value="XiaoMing"></property>
<property name="age" value="22"></property>
<property name="savings" value="10000"></property>
<property name="car" ref="car"></property>
</bean> <bean id="car" class="cn.zno.hello.Car">
<property name="brand" value="BYD"></property>
<property name="price" value="54000"></property>
</bean>
</beans> </beans>
Person.java
package cn.zno.hello; public class Person { private String name; private int age; private double savings; private Car car; public void say(){
System.out.println("Hello World!");
} // -------------getter & setter------------- 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;
} public double getSavings() {
return savings;
} public void setSavings(double savings) {
this.savings = savings;
} public Car getCar() {
return car;
} public void setCar(Car car) {
this.car = car;
} @Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", savings=" + savings
+ ", car=" + car + "]";
}
}
Car.java
package cn.zno.hello; public class Car { private String brand; private double price; public String getBrand() {
return brand;
} public void setBrand(String brand) {
this.brand = brand;
} public double getPrice() {
return price;
} public void setPrice(double price) {
this.price = price;
} @Override
public String toString() {
return "Car [brand=" + brand + ", price=" + price + "]";
} }
Main.java
package cn.zno.hello; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main {
@SuppressWarnings("resource")
public static void main(String[] args) {
// /*传统方式*/
// Person person = new Person();
// person.setName("XiaoMing");
// person.setAge(22);
// person.setSavings(10000);
// //-->
// Car car = new Car();
// car.setBrand("BYD");
// car.setPrice(50000);
// //<--
// person.setCar(car);
//
// System.out.println(person);
// person.say(); /*IoC*/
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-hello.xml"); Person person = (Person) ctx.getBean("person");
System.out.println(person);
person.say(); } }
Console:
六月 , :: 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1ef7de4: startup date [Tue Jun :: CST ]; root of context hierarchy
六月 , :: 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beans-hello.xml]
Person [name=XiaoMing, age=, savings=10000.0, car=Car [brand=BYD, price=54000.0]]
Hello World!
注意问题:
applicationContext.xml 是借助sts生成
ApplicationContext ctx; 应该记死!其实现类可Ctrl+T | F4 查询
目录
└─src
└─main
├─java
│ └─cn
│ └─zno
│ └─hello
│ Car.java
│ Main.java
│ Person.java
│
└─resources
beans-hello.xml
常见错误:
1. xml文件不存在
六月 , :: 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@14e4e31: startup date [Tue Jun :: CST ]; root of context hierarchy
六月 , :: 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beans-hello1.xml]
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [beans-hello1.xml]; nested exception is java.io.FileNotFoundException: class path resource [beans-hello1.xml] cannot be opened because it does not exist
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:)
at cn.zno.hello.Main.main(Main.java:)
Caused by: java.io.FileNotFoundException: class path resource [beans-hello1.xml] cannot be opened because it does not exist
at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:)
... more
2.xml文件中bean未配置
六月 , :: 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1ef7de4: startup date [Tue Jun :: CST ]; root of context hierarchy
六月 , :: 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beans-hello.xml]
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'person1' is defined
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:)
at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:)
at cn.zno.hello.Main.main(Main.java:)
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