spring classpath路径和Resource类

spring classpath路径问题和Resource类的使用。
类文件：

package com.yb.t;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.PathResource;
import org.springframework.core.io.Resource;

public class ClassA {

// 持有一个Resource属性
private Resource resource;

public ClassA() {
init();
}

private void init() {
try {
Resource r = new FileSystemResource("conf/test.txt");
print(r.getInputStream(), "--------FileSystemResource");
r = new ClassPathResource("conf/applicationContext-conf-test.xml");
print(r.getInputStream(), "--------ClassPathResource");
r = new PathResource("conf/test.txt");
print(r.getInputStream(), "--------PathResource");
r = new DefaultResourceLoader().getResource("classpath:conf/applicationContext-conf-test.xml");
print(r.getInputStream(), "--------DefaultResourceLoader");
} catch (IOException e) {
}
}

public void printContent() {
if (resource != null && resource.exists()) {
try {
print(resource.getInputStream(), "--------通过spring的xml配置文件读取resource");
} catch (IOException e) {
}
}
}

public void print(InputStream inputStream, String desc) {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
String line;
System.out.println(desc);
while ((line = br.readLine()) != null) {
System.out.println(line);
}
if (inputStream != null) {
inputStream.close();
}
if (br != null) {
br.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}

public void setResource(Resource resource) {
this.resource = resource;
}

}
spring配置文件：
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean id="classA" class="com.yb.t.ClassA">
<property name="resource">
<value>file:conf/test.txt</value>
</property>
</bean>

</beans>

附件：http://down.51cto.com/data/2367836