spring配置bean的细节一

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一 scope的说明

尽量使用 scope=”singleton” ,不要使用prototype,因为这样对我们的性能影响较大。

二如何给集合类型注入值

java中主要的集合有几种:map、set、list、数组

三代码

1 Department

package com.hsp.collection;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.Set;public class Department {    private String name;    private String [] empName;//数组    private List<Employee> empList;//list集合    private Set<Employee> empsets;//set集合    private Map<String,Employee> empMaps;//map集合    private Properties pp;//Properties的使用        public Set<Employee> getEmpsets() {        return empsets;    }    public void setEmpsets(Set<Employee> empsets) {        this.empsets = empsets;    }    public String[] getEmpName() {        return empName;    }    public void setEmpName(String[] empName) {        this.empName = empName;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public List<Employee> getEmpList() {        return empList;    }    public void setEmpList(List<Employee> empList) {        this.empList = empList;    }    public Map<String, Employee> getEmpMaps() {        return empMaps;    }    public void setEmpMaps(Map<String, Employee> empMaps) {        this.empMaps = empMaps;    }    public Properties getPp() {        return pp;    }    public void setPp(Properties pp) {        this.pp = pp;    }}

2 Employee

package com.hsp.collection;public class Employee {        private String name;        private int id;        public int getId() {                return id;        }        public void setId(int id) {                this.id = id;        }        public String getName() {                return name;        }        public void setName(String name) {                this.name = name;        }}

3 App1

package com.hsp.collection;import java.util.Enumeration;import java.util.Iterator;import java.util.Map;import java.util.Properties;import java.util.Map.Entry;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class App1 {    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        ApplicationContext ac=new ClassPathXmlApplicationContext("com/hsp/collection/beans.xml");        Department department=(Department) ac.getBean("department");        System.out.println(department.getName());        for(String emName:department.getEmpName()){            System.out.println(emName);        }                System.out.println("**********通过list集合取出数据*****");        for(Employee e : department.getEmpList()){                        System.out.println("name="+e.getName()+" "+e.getId());        }        System.out.println("**********通过set集合取出数据*****");        for(Employee e : department.getEmpsets()){                        System.out.println("name="+e.getName());        }                System.out.println("*******通过map集合取出数据 迭代器****");                //1.迭代器        Map<String,Employee> empmaps=department.getEmpMaps();        Iterator it=empmaps.keySet().iterator();        while(it.hasNext()){            String key=(String) it.next();            Employee emp=empmaps.get(key);            System.out.println("key="+key+" "+emp.getName());        }                System.out.println("*******通过map集合取出数据 简洁方法****");        //2.简洁方法        for(Entry<String,Employee> entry1:department.getEmpMaps().entrySet()){                        System.out.println(entry1.getKey()+" "+entry1.getValue().getName());        }                System.out.println("*****通过Propertis取出数据*****");        Properties pp=department.getPp();        //System.out.println(pp.get("pp1").toString());        for(Entry<Object,Object> entry:pp.entrySet()){            System.out.println(entry.getKey().toString()+" "+entry.getValue().toString());        }        System.out.println("*****通过Enumeration取出*****");        Enumeration en= pp.keys();        while(en.hasMoreElements()){        //    Entry<Object,Object> elment= (Entry<Object, Object>) en.nextElement();        //    System.out.println(elment.getKey()+" "+elment.getValue());            String key=(String) en.nextElement();            System.out.println(key+" "+pp.getProperty(key));        }    }}

4 beans.xml

<?xml version="1.0" encoding="utf-8"?><beans xmlns="http://www.springframework.org/schema/beans";                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";                xmlns:context="http://www.springframework.org/schema/context";                xmlns:tx="http://www.springframework.org/schema/tx";                xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-2.5.xsd";><bean id="department" class="com.hsp.collection.Department"><property name="name" value="财务部"/><!-- 给数组注入值 --><property name="empName">        <list>                <value>小明</value>                <value>小明小明</value>                <value>小明小明小明小明</value>        </list></property><!-- 给list注入值 list 中可以有相当的对象 --><property name="empList">        <list>                <ref bean="emp2" />                <ref bean="emp1"/>                <ref bean="emp1"/>                <ref bean="emp1"/>                <ref bean="emp1"/>                <ref bean="emp1"/>                <ref bean="emp1"/>        </list></property><!-- 给set注入值 set不能有相同的对象 --><property name="empsets">        <set>                <ref bean="emp1" />                <ref bean="emp2"/>                <ref bean="emp2"/>                <ref bean="emp2"/>                <ref bean="emp2"/>        </set></property><!-- 给map注入值 map只有key不一样，就可以装配value --><property name="empMaps">        <map>                <entry key="11" value-ref="emp1" />                <entry key="22" value-ref="emp2"/>                <entry key="22" value-ref="emp1"/>        </map></property><!-- 给属性集合配置 --><property name="pp">        <props>                <prop key="pp1">abcd</prop>                <prop key="pp2">hello</prop>        </props></property></bean><bean id="emp1" class="com.hsp.collection.Employee"><property name="name" value="北京"/><property name="id" value="1"/></bean><bean id="emp2" class="com.hsp.collection.Employee"><property name="name" value="天津"/><property name="id" value="2"/></bean></beans>

四测试结果

财务部

小明

小明小明

小明小明小明小明

**********通过list集合取出数据*****

name=天津 2

name=北京 1

**********通过set集合取出数据*****

name=北京

name=天津

*******通过map集合取出数据迭代器****

key=11 北京

key=22 北京

*******通过map集合取出数据简洁方法****

11 北京

22 北京

*****通过Propertis取出数据*****

pp2 hello

pp1 abcd

*****通过Enumeration取出*****

pp2 hello

pp1 abcd

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