p命名空间简化属性依赖注入之setter方法

来源：互联网发布：动漫下载软件编辑：程序博客网时间：2024/05/12 00:17

为了简化setter方法，之前通过<property>进行注入，p命名使用属性，<bean id="" class="" p:属性名="普通值" p:属性名-ref="引用值">。不过这种方法在企业级开发中用的比较少。

如图所示，在实现p命名空间之前，要做一点事情。前面p必选，后面p可以改成别的名字。

来两份Bean

public class address {private String name;private String tel;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getTel() {return tel;}public void setTel(String tel) {this.tel = tel;}@Overridepublic String toString() {return "address [name=" + name + ", tel=" + tel + "]";}}

public class person {private String name;private address homeAddress;private address companyAddress;public String getName() {return name;}public void setName(String name) {this.name = name;}public address getHomeAddress() {return homeAddress;}public void setHomeAddress(address homeAddress) {this.homeAddress = homeAddress;}public address getCompanyAddress() {return companyAddress;}public void setCompanyAddress(address companyAddress) {this.companyAddress = companyAddress;}@Overridepublic String toString() {return "person [name=" + name + ", homeAddress=" + homeAddress+ ", companyAddress=" + companyAddress + "]";}}

我们重点关注xml配置。

<!-- p命名空间企业级开发用的比较少 --><bean id="homeaddressID" class="com.canyugan.setter.address"  p:name="中环村"  p:tel="1816604"></bean><bean id="companyaddressID" class="com.canyugan.setter.address"  p:name="北京天安门"  p:tel="123456"></bean><bean id="personID"   class="com.canyugan.setter.person"   p:name="参与感"  p:homeAddress-ref="homeaddressID"  p:companyAddress-ref="companyaddressID">    </bean>

对比不使用p命名空间的配置方法：

<bean id="homeaddressID" class="com.canyugan.setter.address"><property name="name" value="中关村"></property><property name="tel" value="1816604"></property></bean><bean id="companyaddressID" class="com.canyugan.setter.address"><property name="name" value="北京天安门"></property><property name="tel" value="123456"></property></bean><bean id="personID" class="com.canyugan.setter.person"><property name="name" value="参与感"/><property name="homeAddress" ref="homeaddressID"/><property name="companyAddress" ref="companyaddressID"/></bean>

是不是看不出来有什么优化？对，企业级开发用的少，有些技术狂人就是喜欢倒腾你不会的东西，所以，我们知道有这个东西就可以。

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