Go语言视频零基础入门到精通

javalearner

Spring的依赖注入有三种实现方式，常用是setter和construct方式。对于像数组和集合对象注入，注入前必须填充一些对象到集合中，然后再把集合注入到Bean，采用setter方式来完成。
通过一个例子来说明。

   导入Spring所需的包：commons-logging.jar，spring.jar 。(日志包和Spring包)
包下载地址：
http://www.blogjava.net/Files/ducklyl/Spring.rar

(1)创建ObjectSet类
package com.set; public class ObjectSet {
  private String name;  public String getName() {
   return name;
  }
  public void setName(String name) {
   this.name = name;
  }
  public String toString()
  {
   return name;
  }
}

(2)创建SomeBean类
package com.set; import java.util.List;
import java.util.Map; public class SomeBean {
  private String[] someStrArray;
  private ObjectSet[] someObjArray;
  private List someList;
  private Map someMap;
  public SomeBean()
  {}

  public List getSomeList() {
   return someList;
  }

  public void setSomeList(List someList) {
   this.someList = someList;
  }

  public Map getSomeMap() {
   return someMap;
  }

  public void setSomeMap(Map someMap) {
   this.someMap = someMap;
  }

  public ObjectSet[] getSomeObjArray() {
   return someObjArray;
  }

  public void setSomeObjArray(ObjectSet[] someObjArray) {
   this.someObjArray = someObjArray;
  }
  public String[] getSomeStrArray() {
   return someStrArray;
  }
  public void setSomeStrArray(String[] someStrArray) {
   this.someStrArray = someStrArray;
  }
}

(3)在类路径下，创建set-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="first_object" class="com.set.ObjectSet" >
  <property name="name">
     <value>ducklyl</value>
  </property>
</bean>
<bean id="second_object" class="com.set.ObjectSet" >
  <property name="name">
     <value>wangsp</value>
  </property>
</bean> <bean id="someBean" class="com.set.SomeBean" >
  <property name="someStrArray">
     <list>
      <value>Hello</value>
      <value>Welcome</value>
     </list>
  </property>
  <property name="someObjArray">
   <list>
    <ref bean="first_object"/>
    <ref bean="second_object"/>
   </list>
  </property>
  <property name="someList">
   <list>
    <value>ListTest</value>
    <ref bean="first_object"/>
    <ref bean="second_object"/>
   </list>
  </property>
  <property name="someMap">
   <map>
    <entry key="first">
     <value>Hello,ducklyl!</value>
    </entry>
    <entry key="second">
     <ref bean="first_object"/>
    </entry>
   </map>
  </property>
</bean>
</beans>

(4)创建测试类SpringTest
package com.set; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import java.util.*; public class SpringTest {
  public static void main(String[] args)
  {
  //读取配置文件
  ApplicationContext context=new FileSystemXmlApplicationContext("set-config.xml");
  //获取id="setBean"对象
  SomeBean someBean=(SomeBean)context.getBean("someBean");
  
     //获取someStrArray,someObjArray
  String[] strs=someBean.getSomeStrArray();
  ObjectSet[] some=someBean.getSomeObjArray();
  
  for(int i=0;i<strs.length;i++)
  System.out.println(strs+","+some);
  
     //获取someList
  List someList=(List)someBean.getSomeList();
  for(int i=0;i<someList.size();i++)
   System.out.println(someList.get(i));
  
  //获取someMap
  Map someMap=someBean.getSomeMap();
  System.out.println(someMap);
  
}
}

如果以上配置正确，运行测试程序，结果如下：

Hello,ducklyl
Welcome,wangsp
ListTest
ducklyl
wangsp
{first=Hello,ducklyl!, second=ducklyl}  
  
   
   
     
   

     
   
  
   

  
  
   
   

     
   

     
   
  

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