Spring是一个开放源代码的设计层面框架,他解决的是业务逻辑层和其他各层的松耦合问题,因此它将面向接口的编程思想贯穿整个系统应用。
idref元素用来将容器内其它bean的id传给<constructor-arg/> 或 <property/>元素,同时提供错误验证功能,减少配置的书写错误机率。除了<idref bean=""/>,如果被引用的bean在同一个xml文件中,且bean的名字就是bean的id,除了可以使用<idref local=""/>,此属性允许xml解析器在解析XML的时候对引用的bean进行验证。其实idref就跟value一样,只是将某个字符串注入到属性或者构造函数中,只不过注入的是某个bean定义的id属性值。
<bean id="card" name="card" class="com.zking.pojo.Card">
<constructor-arg index="0" value="121212121"></constructor-arg>
<constructor-arg index="1" value="密码"></constructor-arg>
</bean>
<bean id="card" name="card" class="com.zking.pojo.Card">
<property name="cid" value="2323"></property>
<property name="cname" value="ls"></property>
</bean>
<bean id="person" class="com.zking.pojo.Person">
<property name="person" value="person" />
</bean>
同样在<constructor-arg/>或者<property/>元素内部也可以使用ref元素。用来将bean中指定属性的值设置为对容器中的另外一个bean的引用。
<bean id="person" class="com.zking.pojo.Person">
<property name="person">
<ref bean="person" />
</property>
package com.zking.pojo;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Person {
private String pid;
private String pname;
private String pwd;
private Map<Object, Object> lm;
private Set<String> sc;
private Set<Card> lsc;
private List<String> lp;
private Card card;
public Set<Card> getLsc() {
return lsc;
}
public void setLsc(Set<Card> lsc) {
this.lsc = lsc;
}
public Map<Object, Object> getLm() {
return lm;
}
public void setLm(Map<Object, Object> lm) {
this.lm = lm;
}
public Set<String> getSc() {
return sc;
}
public void setSc(Set<String> sc) {
this.sc = sc;
}
public List<String> getLp() {
return lp;
}
public void setLp(List<String> lp) {
this.lp = lp;
}
public Card getCard() {
return card;
}
public void setCard(Card card) {
this.card = card;
}
public Person() {
super();
}
public Person(String pid, String pname, String pwd) {
super();
this.pid = pid;
this.pname = pname;
this.pwd = pwd;
}
public String getPid() {
return pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
@Override
public String toString() {
return "Person [pid=" + pid + ", pname=" + pname + ", pwd=" + pwd + "]";
}
//init-method
public void infName() {
System.out.println("初始化的值");
}
}
package com.zking.pojo;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.jws.Oneway;
/**
* @ClassName: Card
* @Description: (描述这个类的作用)
* @author LJY
* @date 2018年9月17日 下午2:59:22
*
*/
public class Card {
private String cid;
private String cname;
private Set<String> ls;
private List<String> lp;
private Map<Object, Object> lm;
private Person person;
public Card() {
super();
}
public Map<Object, Object> getLm() {
return lm;
}
public void setLm(Map<Object, Object> lm) {
this.lm = lm;
}
public Set<String> getLs() {
return ls;
}
public void setLs(Set<String> ls) {
this.ls = ls;
}
public List<String> getLp() {
return lp;
}
public void setLp(List<String> lp) {
this.lp = lp;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
public Card(String cid, String cname) {
super();
this.cid = cid;
this.cname = cname;
}
public String getCid() {
return cid;
}
public void setCid(String cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
@Override
public String toString() {
return "Card [cid=" + cid + ", cname=" + cname + "]";
}
}
区别:
ref:注入的是bean的实例
idref:注入的是string。