Spring util-namespace下标签相关操作

java代码

package com.stono.sprtest;

import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AppBean3 {
    @SuppressWarnings("resource")
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("appbeans3.xml");
        List<?> list = (List<?>) context.getBean("instruments");
        for (Object object : list) {
            System.out.println(object);
        }
        Elvis elvis = (Elvis) context.getBean("elvis");
        System.out.println(elvis.getName()); // #{'abc'[0]}
        System.out.println(elvis.getName2()); // #{map['b']}
        @SuppressWarnings("unchecked")
        Map<String, ?> map = (Map<String, ?>) context.getBean("map");
        System.out.println(map.get("c"));
        System.out.println(map.get("d")); // 从属性文件中读取内容；
        System.out.println(map.get("e")); // 打出了全部
        System.out.println(map.get("e1"));
        Object x = map.get("f"); // x对象为properties对象；
        System.out.println(x); // 打出了全部
        System.out.println(map.get("f1"));
        Set<?> set = (Set<?>) context.getBean("set");
        System.out.println(set);
        Object prop = context.getBean("prop"); // 获取属性文件对象
        System.out.println(prop); // {stono.amber=Amber, stono.minstrel=Minstrel}
        System.out.println(map.get("g"));// #{set.?[age eq 10]}表达式
        System.out.println(map.get("h"));// #{set.^[age gt 11]}表达式
        System.out.println(map.get("i"));// #{set.$[age gt 11]}表达式
        Object x2 = map.get("j");// #{ .![]}返回ArrayList
        System.out.println(x2);// #{set.![age]}表达式 result:[10, 15, 20, 25, 25];即便只有一个元素，也是返回ArrayList
        System.out.println(map.get("k"));// #{set.?[age gt 10]}表达式
        Object list2 = context.getBean("list2");
        System.out.println(list2);
        System.out.println(context.getBean("pi"));// util:constant标签
        Object ppath = context.getBean("ppath"); // util:property-path标签
        System.out.println(ppath);
        System.out.println(map.get(Math.PI)); //map中key-ref的使用；
    }
}

xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"
    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-3.0.xsd
        http://www.springframework.org/schema/util 
        http://www.springframework.org/schema/util/spring-util-4.1.xsd">
    <util:list id="instruments">
        <bean class="com.stono.sprtest.Cymbal"></bean>
        <bean class="com.stono.sprtest.Harmonica"></bean>
        <bean class="com.stono.sprtest.Saxophone"></bean>
    </util:list>
    <bean id="elvis" class="com.stono.sprtest.Elvis">
        <property name="instrument" value="#{instruments[0]}"></property>
        <property name="name" value="#{'abc'[0]}"></property>
        <property name="name2" value="#{map['b']}"></property>
    </bean>
    <util:map id="map">
        <entry key="a" value="a"></entry>
        <entry>
            <key>
                <value>b</value>
            </key>
            <value>b</value>
        </entry>
        <entry key="c" value-ref="instruments"></entry>
        <entry key="d" value="#{prop['stono.amber']}"></entry>
        <entry key="e" value="#{systemEnvironment }"></entry>
        <entry key="e1" value="#{systemEnvironment['USERPROFILE'] }"></entry>
        <entry key="f" value="#{systemProperties}"></entry>
        <entry key="f1" value="#{systemProperties['os.name']}"></entry>
        <entry key="g" value="#{set.?[age eq 10]}"></entry>
        <entry key="h" value="#{set.^[age gt 11]}"></entry>
        <entry key="i" value="#{set.$[age gt 11]}"></entry>
        <entry key="j" value="#{set.![age]}"></entry>
        <entry key="k" value="#{set.?[age gt 10]}"></entry>
        <entry key-ref="pi" value="PI"></entry>
    </util:map>
    <util:set id="set">
        <bean class="com.stono.sprtest.Duke" p:age="10"></bean>
        <bean class="com.stono.sprtest.Duke" p:age="15"></bean>
        <bean class="com.stono.sprtest.Duke" p:age="20"></bean>
        <bean class="com.stono.sprtest.Duke" p:age="25"></bean>
        <bean class="com.stono.sprtest.Duke" p:age="25"></bean>
    </util:set>
    <util:properties id="prop" location="classpath:settings.properties">
    </util:properties>
    <util:list id="list2">
        <bean class="java.lang.Integer">
            <constructor-arg>
                <value>10</value>
            </constructor-arg>
        </bean>
        <bean class="java.lang.String">
            <constructor-arg>
                <value>typography</value>
            </constructor-arg>
        </bean>
        <bean class="java.util.Calendar" factory-method="getInstance"></bean>
    </util:list>
    <util:constant id="pi" static-field="java.lang.Math.PI"/>
    <bean id="duke" class="com.stono.sprtest.Duke" p:age="80"></bean>
    <util:property-path id="ppath" path="duke.age"/>
</beans>