框架技术--S2SH框架整合（spring部分）No 2--属性注入
即框架技术--S2SH框架整合（spring部分）No 1这章讲解后，简单了解了下，spring的IOC容器的依赖注入，及相应的配置。
下面继续说下属性的依赖注入。
1、导入spring相应包。
2、我们在项目组构建一个类bean，其中包含属性类型有字符串、list、map、set数组。
package spring.bean;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Bean {
private String st;
private List list;
private Map map;
private Set set;
public String getSt() {
return st;
}
public void setSt(String st) {
this.st = st;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
public Set getSet() {
return set;
}
public void setSet(Set set) {
this.set = set;
}
}
3、编写spring的配置文件，针对bean属性中，不同类型的属性，均可在配置文件中进行注入
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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="bean" class="spring.bean.Bean">
<property name="st" value="str" />
<property name="list">
<list>
<value>list1</value>
<value>list2</value>
</list>
</property>
<property name="map">
<map>
<entry key="key1" value="value1"/>
<entry key="key2" value="value2"/>
</map>
</property>
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
</bean>
</beans>
4、建立个main方法进行下测试
package spring.test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import spring.bean.Bean;
public class BeanTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
BeanFactory factory = new ClassPathXmlApplicationContext(
"applicationContext.xml");
Bean bean = (Bean)factory.getBean("bean");
System.out.println(bean.getSt());
System.out.println(bean.getList());
System.out.println(bean.getMap());
System.out.println(bean.getSet());
}
}
输出结果：
str
[list1, list2]
{key1=value1, key2=value2}
[set1, set2]
在spring的配置文件中会通过属性类型的标签自动为我们转换，但是有些类型就无法转换（如 date），这时就需要我们自己去定义一个属性编辑器。
1、在类bean中增加一个类型为date的属性
package spring.bean;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Bean {
private String st;
private List list;
private Map map;
private Set set;
private Date date;
public String getSt() {
return st;
}
public void setSt(String st) {
this.st = st;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public Map getMap() {
return map;
}
public void setMap(Map map) {
this.map = map;
}
public Set getSet() {
return set;
}
public void setSet(Set set) {
this.set = set;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
}
2、spring配置文件中为date类型注入值
<?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="bean" class="spring.bean.Bean">
<property name="st" value="str" />
<property name="list">
<list>
<value>list1</value>
<value>list2</value>
</list>
</property>
<property name="map">
<map>
<entry key="key1" value="value1"/>
<entry key="key2" value="value2"/>
</map>
</property>
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
<property name="date">
<value>2012-01-01</value>
</property>
</bean>
</beans>
3、运行main方法
package spring.test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import spring.bean.Bean;
public class BeanTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
BeanFactory factory = new ClassPathXmlApplicationContext(
"applicationContext.xml");
Bean bean = (Bean)factory.getBean("bean");
System.out.println(bean.getSt());
System.out.println(bean.getList());
System.out.println(bean.getMap());
System.out.println(bean.getSet());
System.out.println(bean.getDate());
}
}
4、控制台抛出这样一个异常，意思是string类型无法转换成date类型。
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bean' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are: PropertyAccessException 1: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.lang.String] to required type [java.util.Date] for property 'date'; nested exception is java.lang.IllegalArgumentException: No matching editors or conversion strategy found Caused by: org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessException details (1) are: PropertyAccessException 1: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.lang.String] to required type [java.util.Date] for property 'date'; nested exception is java.lang.IllegalArgumentException: No matching editors or conversion strategy found Caused by: java.lang.IllegalArgumentException: No matching editors or conversion strategy found at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:212) at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:127) at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:775) at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:608) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValue(AbstractPropertyAccessor.java:49) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:74) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:57) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:970) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:729) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:416) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:290) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:348) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:92) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:77) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:68) at spring.test.BeanTest.main(BeanTest.java:15)
此时需要我们自定义一个属性转换器。
1、增加一个继承PropertyEditorSupport类并重写setAsText方法，并对日期类型的字符串进行一个转换处理。
package spring.util;
import java.beans.PropertyEditorSupport;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateEditUtil extends PropertyEditorSupport {
@Override
public void setAsText(String arg0) throws IllegalArgumentException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
try {
Date d = sdf.parse(arg0);
this.setValue(d);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
2、上面的属性转换类写好后，也需要进行一个注入。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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="bean" class="spring.bean.Bean">
<property name="st" value="str" />
<property name="list">
<list>
<value>list1</value>
<value>list2</value>
</list>
</property>
<property name="map">
<map>
<entry key="key1" value="value1"/>
<entry key="key2" value="value2"/>
</map>
</property>
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
<property name="date">
<value>2012-01-01</value>
</property>
</bean>
<bean name="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.util.Date">
<bean class="spring.util.DateEditUtil"></bean>
</entry>
</map>
</property>
</bean>
</beans>
3、这时在运行测试程序就没有问题了。
str
[list1, list2]
{key1=value1, key2=value2}
[set1, set2]
Sun Jan 01 00:01:00 CST 2012