Spring复杂对象的注入

                                                                            Spring 复杂对象的注入

    复杂对象主要分为有两类&＃xff1a;Collection类(包括数组和list)和Map类。

    List的注入形式&＃xff1a;(数组形式其实是差不多的)

public class OneManBand implements Performer {public OneManBand() {}public void perform() throws PerformanceException {for (Instrument instrument : instruments) {instrument.play();}}private Collection instruments;private Collection names;public Collection getNames() {return names;}public void setNames(Collection names) {this.names &＃61; names;}public void setInstruments(Collection instruments) {this.instruments &＃61; instruments; // }public static void main(String args[]){ApplicationContext ac&＃61;new ClassPathXmlApplicationContext("com/springinaction/springidol/springidol-context-2.xml");OneManBand one&＃61;(OneManBand)ac.getBean("oneManBand");System.out.println(one.getNames());}
}


1nihao

    map 注入&＃xff1a;

public class OneManBand implements Performer {private Collection instruments;private Map prices;public Map getPrices() {return prices;}public void setPrices(Map prices) {this.prices &＃61; prices;}public static void main(String args[]){ApplicationContext ac&＃61;new ClassPathXmlApplicationContext("com/springinaction/springidol/springidol-context-2.xml");OneManBand one&＃61;(OneManBand)ac.getBean("oneManBand");System.out.println(one.getPrices());}
}

    xml的正确写法&＃xff1a;可以装配空值这个很关键。