JAVA获取内部及外部配置

package cn.ting.common.util;

import java.io.IOException;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

public class PropertiesUtils {

private static final Logger log = Logger.getLogger("PropertiesUtils");

private static PropertiesUtils propertiesUtils = null;
private Properties config = null;

public PropertiesUtils(){
try {
Resource resource = new ClassPathResource("/env.properties");
config = PropertiesLoaderUtils.loadProperties(resource);
} catch (IOException e) {
log.error(e.getMessage());
throw new RuntimeException("找不到配置文件：env.properties");
}
}

public static String getProperty(String key){
return getConfig().getProperty(key);
}

private static Properties getConfig(){
if(null == propertiesUtils){
propertiesUtils = new PropertiesUtils();
}
return propertiesUtils.config;
}
}

package cn.ting.common.util;

import java.io.IOException;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;

public class ExternalPropertiesUtils {

private static final Logger log = Logger.getLogger("ExternalPropertiesUtils");

private static ExternalPropertiesUtils externalPropertiesUtils = null;
private Properties config = null;

public ExternalPropertiesUtils(){
try {
String path = PropertiesUtils.getProperty("external.properties.path");
Resource resource = new FileSystemResource(path);
config = PropertiesLoaderUtils.loadProperties(resource);
} catch (IOException e) {
log.error(e.getMessage());
throw new RuntimeException("找不到外部配置文件");
}
}

public static String getProperty(String key){
return getConfig().getProperty(key);
}

private static Properties getConfig(){
if(null == externalPropertiesUtils){
externalPropertiesUtils = new ExternalPropertiesUtils();
}
return externalPropertiesUtils.config;
}
}