Spring学习笔记-注入实战篇

spring对各种数据类型都提供了注入支持，像java基本类型，对象，集合等，这篇文章以代码实践为主，代码注释中会解释注入的细节

测试类中包含了我们编程中最常见的数据结构

package com.crazycoder2010.spring.injection;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class Student {
	private int age;
	private double weight;
	private String name;
	private boolean registed;
	private Properties properties;
	private Map<?, ?> attributes;
	private List<?> scores;
	private Set<?> sets;
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public boolean isRegisted() {
		return registed;
	}
	public void setRegisted(boolean registed) {
		this.registed = registed;
	}
	public Properties getProperties() {
		return properties;
	}
	public void setProperties(Properties properties) {
		this.properties = properties;
	}
	public Map<?, ?> getAttributes() {
		return attributes;
	}
	public void setAttributes(Map<?, ?> attributes) {
		this.attributes = attributes;
	}
	public List<?> getScores() {
		return scores;
	}
	public void setScores(List<?> scores) {
		this.scores = scores;
	}
	public Set<?> getSets() {
		return sets;
	}
	public void setSets(Set<?> sets) {
		this.sets = sets;
	}
	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("age=").append(this.age).append("/n").append("weight=")
				.append(this.weight).append("/n").append("name=")
				.append(this.name).append("/n").append("registed=")
				.append(this.registed).append("/n").append("properties={");
		StringBuilder tmp = new StringBuilder();
		for (Object key : this.properties.keySet()) {
			tmp.append(key).append("=").append(properties.get(key)).append(",");
		}
		builder.append(tmp).append("}/n");
		builder.append("attributes={");
		StringBuilder map = new StringBuilder();
		for (Object key : attributes.keySet()) {
			map.append(key).append("=").append(attributes.get(key)).append(",");
		}
		builder.append(map).append("}/n");
		builder.append("scores={");
		for (Object obj : scores) {
			builder.append(obj).append(",");
		}
		builder.append("}/n");
		builder.append("sets={");
		for (Object obj : sets) {
			builder.append(obj).append(",");
		}
		builder.append("}/n");
		return builder.toString();
	}
}

看下在配置文件中如何对各种类型注入

<?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-2.5.xsd">
	<bean id="student" class="com.crazycoder2010.spring.injection.Student">
		<!-- 整形普通属性直接写入值即可 -->
		<property name="age" value="20"></property>
		<!-- 也可以搞个value标签 -->
		<property name="name">
			<value>张三</value>
		</property>
		<!-- 布尔型 -->
		<property name="registed" value="true"></property>
		<!-- double类型 -->
		<property name="weight" value="142.5"></property>
		<!-- list类型注入 -->
		<property name="scores">
			<list><!-- 这个地方是个list -->
				<value>90</value>
				<value>98</value>
				<value>87</value>
			</list>
		</property>
		<!-- 注入map -->
		<property name="attributes">
			<map><!--这个地方是map,注意内嵌的标签是entry,是一个键值对 -->
				<entry key="a1">
					<value>12345</value>
				</entry>
				<entry key="a2" value="hello-world"></entry>
			</map>
		</property>
		<!-- Properties注入 -->
		<property name="properties">
			<props><!-- 雷同与map,但是注意prop标签只有key属性，因为value只能是String类型，prop对应的值直接写在标签内部 -->
				<prop key="p1">789</prop>
				<prop key="p2">567</prop>
			</props>
		</property>
		<!-- 集合注入 -->
		<property name="sets">
			<set>
				<value>你好</value>
				<value>123</value>
				<null></null><!-- 这个地方我们注入一个null进去 -->
			</set>
		</property>
	</bean>
</beans>

打印输出

age=20

weight=142.5

name=张三

registed=true

properties={p2=567,p1=789,}

attributes={a1=12345,a2=hello-world,}

scores={90,98,87,}

sets={你好,123,null,}

附BaseSpring类

package com.crazycoder2010.spring;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class BaseSpring {
	BeanFactory beanFactory = null;
	public Object getBean(String beanName) {
		init();//确保spring容器已经启动
		return beanFactory.getBean(beanName);
	}
	private void init() {
		if (beanFactory == null) {
			beanFactory = new ClassPathXmlApplicationContext(configFiles());//这个地方
		}
	}
	protected String[] configFiles() {
		//这里作了个约定，默认的spring文件都放在与当前类平行的目录下，名称为applicationContex.xml
		//如要测试的类为com.crazycoder2010.spring.injection.StudentTest
		//则该测试的spring配置文件路径为com/crazycoder2010/spring/injection/applicationContex.xml
		//子类可以复写这个方法类实现定制化需求
		String folder = getClass().getPackage().getName()
				.replaceAll("//.", "/")
				+ "/";
		String file = "applicationContext.xml";
		return new String[] { folder + file };
	}
}