propeties配置文件


1.PropertyPlaceholderConfigurer & <context:property-placeholder />

--单个PropertyPlaceholderConfigurer 

ApplicationContext.xml

<context:property-placeholder 
location="classpath:test.properties,classpath:test1.properties"/>

test.properties

student.id=1000
student.name=siyuan

test1.properties

student.id=10001
student.name=siyuan1

注入(占位符${...})

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component("stu")
public class Student {

@Value("${student.id}")
private int id;

@Value("${student.name}")
private String name;

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;
}

}

Test.java

 

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.siyuan.test.spring.Student;


public class Test {

public static void main(String[] args) {
ApplicationContext ctxt = new ClassPathXmlApplicationContext("ApplicationContext.xml");
Student stu = (Student) ctxt.getBean("stu");
System.out.println(stu.getId() + ":" + stu.getName());
}

}

输出结果

 

10001:siyuan1

结论:多个properties按先后顺序加载,重复则覆盖


--多个PropertyPlaceholderConfigurer


ApplicationContext.xml


 


    <context:property-placeholder location="classpath:test.properties"/>
<context:property-placeholder location="classpath:test1.properties"/>

输出结果

 

1000:siyuan

结论:按先后顺序加载,重复则忽略,即先加载的优先级高


改变优先级


ApplicationContext.xml


 


    <context:property-placeholder location="classpath:test.properties" order="2"/>
<context:property-placeholder location="classpath:test1.properties" order="1"/>

输出结果

 

10001:siyuan1

结论:可通过设置order属性改变优先级,优先级按order从小到大排序,即order小的优先级高


2.PropertiesFactoryBean & <util:properties/>


配置:


<util:properties id="studentProp" location="classpath:test.properties"/>

注入(SpEL):


@Value("#{studentProp['student.id']}")








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