List,Map,Set,对象数组(VO中)

最新推荐文章于 2022-04-02 12:30:15 发布

原创最新推荐文章于 2022-04-02 12:30:15 发布 · 898 阅读

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本文通过一个具体的Java示例展示了如何使用Spring框架进行不同类型的依赖注入，包括数组、List、Set和Map等形式，并演示了如何通过Spring配置文件定义Bean及其属性。

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User.java

package org.eimhe;

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

public class User {
private String username;
private Home[] myhomes;
private List myhomes1;
private Set myhomes2;
private Map myhomes3;
// public User(Home myhome){
// this.myhome=myhome;
// }
public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public Home[] getMyhomes() {
return myhomes;
}

public void setMyhomes(Home[] myhomes) {
this.myhomes = myhomes;
}

public List getMyhomes1() {
return myhomes1;
}

public void setMyhomes1(List myhomes1) {
this.myhomes1 = myhomes1;
}

public Set getMyhomes2() {
return myhomes2;
}

public void setMyhomes2(Set myhomes2) {
this.myhomes2 = myhomes2;
}

public Map getMyhomes3() {
return myhomes3;
}

public void setMyhomes3(Map myhomes3) {
this.myhomes3 = myhomes3;
}
}

Home.java

package org.eimhe;

public class Home {
private String homeaddr;

public String getHomeaddr() {
return homeaddr;
}

public void setHomeaddr(String homeaddr) {
this.homeaddr = homeaddr;
}
}
applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<bean id="user" class="org.eimhe.User" abstract="false"
  singleton="true" lazy-init="default" autowire="byType"
  dependency-check="default">
  <property name="username">
   <value>weidong</value>
  </property>
  <property name="myhomes">
   <list>
    <ref bean="home" />
    <ref bean="home" />
   </list>
  </property>
  <property name="myhomes1">
   <list>
    <ref bean="home" />
   </list>
  </property>
  <property name="myhomes2">
   <set>
    <ref bean="home" />
    <ref bean="home" />
   </set>
  </property>
  <property name="myhomes3">
   <map>
    <entry key="myhomet1">
     <ref bean="home" />
    </entry>
    <entry key="myhomet2" value="hahaha"></entry>
   </map>
  </property>
</bean>

</beans>

TestMain.java

package org.eimhe;

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

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class TestMain {

public static void main(String[] args) {
  ApplicationContext context=null;
  context=new FileSystemXmlApplicationContext("org/eimhe/applicationContext.xml");
  User user=(User)context.getBean("user");
  System.out.println(user.getUsername());
//  System.out.println(user.getMyhome().getHomeaddr());
  Home[] myhomes=(Home[])user.getMyhomes();
  for(int i=0;i<myhomes.length;i++){
   System.out.println(myhomes[i].getHomeaddr());
  }
  List myhome =(List)user.getMyhomes1();
  Iterator iter=myhome.iterator();
  while(iter.hasNext()){
   Home home=(Home)iter.next();
   System.out.println(home.getHomeaddr());
  }
//  Set set=(Set)user.getMyhomes2();
//  Iterator iter=set.iterator();
//  while(iter.hasNext()){
//   Home h=(Home)iter.next();
//   System.out.println(h.getHomeaddr());
//
//  }
  Map m=(Map)user.getMyhomes3();
  Home h=(Home)m.get("myhomet1");
  System.out.println(h.getHomeaddr());
  String str=(String)m.get("myhomet2");
  System.out.println(str);
}

}