Spring实战——使用util:命名空间简化配置

本是古典何须时尚 2021-07-24 20:02 392阅读 0赞

**一 配置**

<?xml version="1.0" encoding="GBK"?>
    
    <beans xmlns="http://www.springframework.org/schema/beans"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:p="http://www.springframework.org/schema/p"
         xmlns:util="http://www.springframework.org/schema/util"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
         http://www.springframework.org/schema/util
         http://www.springframework.org/schema/util/spring-util-4.0.xsd">
         
         <bean id="chinese"  class="org.crazyit.app.service.impl.Chinese"
               p:age-ref="chin.age" p:axe-ref="stoneAxe"
               p:schools-ref="chin.schools"
               p:axes-ref="chin.axes"
               p:scores-ref="chin.scores"/>
         
         <util:constant id="chin.age" static-field=
               "java.sql.Connection.TRANSACTION_SERIALIZABLE"/>
         
         <util:properties id="confTest"
               location="classpath:test_zh_CN.properties"/>
         
         <util:list id="chin.schools"  list-class="java.util.LinkedList">
               
               <value>小学</value>
               <value>中学</value>
               <value>大学</value>
         </util:list>
         
         <util:set id="chin.axes" set-class="java.util.HashSet">
               
               <value>字符串</value>
               <bean class="org.crazyit.app.service.impl.SteelAxe"/>
               <ref bean="stoneAxe"/>
         </util:set>
         
         <util:map id="chin.scores" map-class="java.util.TreeMap">
               <entry key="数学" value="87"/>
               <entry key="英语" value="89"/>
               <entry key="语文" value="82"/>
         </util:map>
         
         <bean id="steelAxe"  class="org.crazyit.app.service.impl.SteelAxe"/>
         
         <bean id="stoneAxe"  class="org.crazyit.app.service.impl.StoneAxe"/>
    </beans>

**二 接口**

Axe

package org.crazyit.app.service;
    
    public interface Axe
    {
         // Axe接口里有个砍的方法
         public String chop();
    }

Person

package org.crazyit.app.service;
    
    public interface Person
    {
         // 定义一个使用斧子的方法
         public void useAxe();
    }

**三 实现**

Chinese

package org.crazyit.app.service.impl;
    
    
    import java.util.*;
    import org.crazyit.app.service.*;
    
    public class Chinese implements Person
    {
        private Axe axe;
        private int age;
        private List schools;
        private Map scores;
        private Set axes;
    
    
        // axe的setter方法
        public void setAxe(Axe axe)
        {
            this.axe = axe;
        }
        // age的setter方法
        public void setAge(int age)
        {
            this.age = age;
        }
        // schools的setter方法
        public void setSchools(List schools)
        {
            this.schools = schools;
        }
        // scores的setter方法
        public void setScores(Map scores)
        {
            this.scores = scores;
        }
        // axes的setter方法
        public void setAxes(Set axes)
        {
            this.axes = axes;
        }
        // 实现Person接口的useAxe()方法
        public void useAxe()
        {
            System.out.println(axe.chop());
            System.out.println("age属性值：" + age);
            System.out.println(schools);
            System.out.println(scores);
            System.out.println(axes);
        }
    }

StoneAxe

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class StoneAxe implements Axe
    {
         public String chop()
         {
               return "石斧砍柴好慢";
         }
    }

SteelAxe

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class SteelAxe implements Axe
    {
         public String chop()
         {
               return "钢斧砍柴真快";
         }
    }

**四 测试类**

package lee;
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    import org.crazyit.app.service.*;
    
    public class BeanTest
    {
        public static void main(String[] args)
        {
            // 创建Spring容器
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            // 获取chinese实例
            Person p = ctx.getBean("chinese" , Person.class);
            // 调用useAxe()方法
            p.useAxe();
            System.out.println(ctx.getBean("confTest"));
        }
    }

**五 资源文件**

a=\u8f7b\u91cf\u7ea7Java EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218
    b=\u75af\u72c2Java\u8bb2\u4e49

**六 运行**

石斧砍柴好慢
    age属性值：8
    [小学, 中学, 大学]
    {数学=87, 英语=89, 语文=82}
    [字符串, org.crazyit.app.service.impl.SteelAxe@eec5a4a,  org.crazyit.app.service.impl.StoneAxe@2b2948e2]
    {b=疯狂Java讲义, a=轻量级Java EE企业应用实战}