spring_injection

1、spring的普通属性注入
参见：spring文档3.3章节

什么是属性编辑器，作用？
* 自定义属性编辑器，spring配置文件中的字符串转换成相应的对象进行注入
spring已经有内置的属性编辑器，我们可以根据需求自己定义属性编辑器

* 如何定义属性编辑器？
* 继承PropertyEditorSupport类，覆写setAsText()方法，参见：UtilDatePropertyEditor.java
* 将属性编辑器注册到spring中，参见：applicationContext-editor.xml

依赖对象的注入方式，可以采用：
* ref属性
* <ref>标签
* 内部<bean>来定义

如何将公共的注入定义描述出来？
* 通过<bean>标签定义公共的属性，指定abstract=true
* 具有相同属性的类在<bean>标签中指定其parent属性

参见：applicationContext-other.xml



applicationContext-other.xml

引用

<?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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
  
   <bean id="beanAbstract" abstract="true">
   <property name="id" value="1000"/>
   <property name="name" value="Jack"/>
   </bean>        
  
   <bean id="bean3" class="com.bjsxt.spring.Bean3" parent="beanAbstract">
   <property name="name" value="Tom"/>
   <property name="password" value="123"/>
   </bean>       
  
   <bean id="bean4" class="com.bjsxt.spring.Bean4" parent="beanAbstract"/>
</beans>

applicationContext-beans.xml

引用

<?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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

<bean id="bean1" class="com.bjsxt.spring.Bean1">
<property name="strValue" value="Hello"/>
<!--
<property name="intValue" value="123"/>
-->
<property name="intValue">
<value>123</value>
</property>
<property name="listValue">
<list>
<value>list1</value>
<value>list2</value>
</list>
</property>
<property name="setValue">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
<property name="arrayValue">
<list>
<value>array1</value>
<value>array2</value>
</list>
</property>
<property name="mapValue">
<map>
<entry key="k1" value="v1"/>
<entry key="k2" value="v2"/>
</map>
</property>
<property name="dateValue">
<value>2008-08-15</value>
</property>
</bean>

<bean id="bean2" class="com.bjsxt.spring.Bean2">
<property name="bean3" ref="bean3"/>
<property name="bean4">
<ref bean="bean4"/>
</property>
<property name="bean5" ref="bean5"/>
</bean>

<!--
<bean id="bean3" class="com.bjsxt.spring.Bean3">
<property name="id" value="1000"/>
<property name="name">
<value>Jack</value>
</property>
<property name="password" value="123"/>
</bean>

<bean id="bean4" class="com.bjsxt.spring.Bean4">
<property name="id" value="1000"/>
<property name="name" value="Jack"/>
</bean>
-->

<bean id="bean5" class="com.bjsxt.spring.Bean5">
<property name="age" value="20"/>
</bean>
</beans>

applicationContext-editor.xml

引用

<?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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
     <!-- 定义属性编辑器 -->     
<bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.util.Date">
<bean class="com.bjsxt.spring.UtilDatePropertyEditor">
<property name="format" value="yyyy-MM-dd"/>
</bean>
</entry>
</map>
</property>
</bean>

<!--
<bean id="utilDatePropertyEditor" class="com.bjsxt.spring.UtilDatePropertyEditor"></bean>
-->
</beans>

log4j.properties

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!
# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.
log4j.rootLogger=INFO, stdout, logfile

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=${petstore.root}/WEB-INF/petstore.log
log4j.appender.logfile.MaxFileSize=512KB
# Keep three backup files.
log4j.appender.logfile.MaxBackupIndex=3
# Pattern to output: date priority [category] - message
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

UtilDatePropertyEditor.java

package com.bjsxt.spring;

import java.beans.PropertyEditorSupport;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * java.util.Date属性编辑器 
 * @author Administrator
 *
 */
public class UtilDatePropertyEditor extends PropertyEditorSupport {

	private String format="yyyy-MM-dd";
	
	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		System.out.println("UtilDatePropertyEditor.saveAsText() -- text=" + text);
		
		SimpleDateFormat sdf = new SimpleDateFormat(format);
		try {
			Date d = sdf.parse(text);
			this.setValue(d);
		} catch (ParseException e) {
			e.printStackTrace();
		}
	}

	public void setFormat(String format) {
		this.format = format;
	}

}

Bean1.java

package com.bjsxt.spring;

import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Bean1 {
	
	private String strValue;
	
	private int intValue;
	
	private List listValue;
	
	private Set setValue;
	
	private String[] arrayValue;
	
	private Map mapValue;
	
	private Date dateValue;

	public String getStrValue() {
		return strValue;
	}

	public void setStrValue(String strValue) {
		this.strValue = strValue;
	}

	public int getIntValue() {
		return intValue;
	}

	public void setIntValue(int intValue) {
		this.intValue = intValue;
	}

	public List getListValue() {
		return listValue;
	}

	public void setListValue(List listValue) {
		this.listValue = listValue;
	}

	public Set getSetValue() {
		return setValue;
	}

	public void setSetValue(Set setValue) {
		this.setValue = setValue;
	}

	public String[] getArrayValue() {
		return arrayValue;
	}

	public void setArrayValue(String[] arrayValue) {
		this.arrayValue = arrayValue;
	}

	public Map getMapValue() {
		return mapValue;
	}

	public void setMapValue(Map mapValue) {
		this.mapValue = mapValue;
	}

	public Date getDateValue() {
		return dateValue;
	}

	public void setDateValue(Date dateValue) {
		this.dateValue = dateValue;
	}
}

Bean2.java

package com.bjsxt.spring;

public class Bean2 {

	private Bean3 bean3;
	
	private Bean4 bean4;
	
	private Bean5 bean5;

	public Bean3 getBean3() {
		return bean3;
	}

	public void setBean3(Bean3 bean3) {
		this.bean3 = bean3;
	}

	public Bean4 getBean4() {
		return bean4;
	}

	public void setBean4(Bean4 bean4) {
		this.bean4 = bean4;
	}

	public Bean5 getBean5() {
		return bean5;
	}

	public void setBean5(Bean5 bean5) {
		this.bean5 = bean5;
	}
}

Bean3.java

package com.bjsxt.spring;

public class Bean3 {
	
	private int id;
	
	private String name;
	
	private String password;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}
}

Bean4.java

package com.bjsxt.spring;

public class Bean4 {

	private int id;
	
	private String name;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

Bean5.java

package com.bjsxt.spring;

public class Bean5 {
	
	private int age;

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
}

InjectionTest.java

package com.bjsxt.spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import junit.framework.TestCase;

public class InjectionTest extends TestCase {
	
	private BeanFactory factory;
	
	@Override
	protected void setUp() throws Exception {
		factory = new ClassPathXmlApplicationContext("applicationContext-*.xml");	
	}

	public void testInjection1() {
		Bean1 bean1 = (Bean1)factory.getBean("bean1");
		
		System.out.println("bean1.strValue=" + bean1.getStrValue());
		System.out.println("bean1.intValue=" + bean1.getIntValue());
		System.out.println("bean1.listValue=" + bean1.getListValue());
		System.out.println("bean1.setValue=" + bean1.getSetValue());
		System.out.println("bean1.arrayValue=" + bean1.getArrayValue());
		System.out.println("bean1.mapValue=" + bean1.getMapValue());
		System.out.println("bean1.dateValue=" + bean1.getDateValue());
	}
	
	public void testInjection2() {
		Bean2 bean2 = (Bean2)factory.getBean("bean2");
		
		System.out.println("bean2.bean3.id=" + bean2.getBean3().getId());
		System.out.println("bean2.bean3.name=" + bean2.getBean3().getName());
		System.out.println("bean2.bean3.password=" + bean2.getBean3().getPassword());
		System.out.println("bean2.bean4.id=" + bean2.getBean4().getId());
		System.out.println("bean2.bean4.name=" + bean2.getBean4().getName());
		System.out.println("bean2.bean5.age=" + bean2.getBean5().getAge());
	}
	
}