java 配置文件操作工具

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package cn.xc.util;


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


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;




public class PropertyUtile{
private static Logger logger = LoggerFactory.getLogger(PropertyUtile.class);


private static ResourceLoader resourceLoader = new DefaultResourceLoader();


private final static Properties properties = loadProperties("/config.properties");



public Properties getProperties() {
return properties;
}


/**
* 取出Property,但以System的Property优先,取不到返回空字符串.
*/
private static String getValue(String key) {
String systemProperty = System.getProperty(key);
if (systemProperty != null) {
return systemProperty;
}
if (properties.containsKey(key)) {
return properties.getProperty(key);
}
return "";
}


/**
* 取出String类型的Property,但以System的Property优先,如果都为Null则抛出异常.
*/
public static String getProperty(String key) {
String value = getValue(key);
if (value == null) {
throw new NoSuchElementException();
}
return value;
}


/**
* 取出String类型的Property,但以System的Property优先.如果都为Null则返回Default值.
*/
public static String getProperty(String key, String defaultValue) {
String value = getValue(key);
return value != null ? value : defaultValue;
}


/**
* 取出Integer类型的Property,但以System的Property优先.如果都为Null或内容错误则抛出异常.
*/
public static Integer getInteger(String key) {
String value = getValue(key);
if (value == null) {
throw new NoSuchElementException();
}
return Integer.valueOf(value);
}


/**
* 取出Integer类型的Property,但以System的Property优先.如果都为Null则返回Default值,如果内容错误则抛出异常
*/
public static Integer getInteger(String key, Integer defaultValue) {
String value = getValue(key);
return value != null ? Integer.valueOf(value) : defaultValue;
}


/**
* 取出Double类型的Property,但以System的Property优先.如果都为Null或内容错误则抛出异常.
*/
public static Double getDouble(String key) {
String value = getValue(key);
if (value == null) {
throw new NoSuchElementException();
}
return Double.valueOf(value);
}


/**
* 取出Double类型的Property,但以System的Property优先.如果都为Null则返回Default值,如果内容错误则抛出异常
*/
public static Double getDouble(String key, Integer defaultValue) {
String value = getValue(key);
return value != null ? Double.valueOf(value) : defaultValue;
}


/**
* 取出Boolean类型的Property,但以System的Property优先.如果都为Null抛出异常,如果内容不是true/
* false则返回false.
*/
public static Boolean getBoolean(String key) {
String value = getValue(key);
if (value == null) {
throw new NoSuchElementException();
}
return Boolean.valueOf(value);
}


/**
* 取出Boolean类型的Property,但以System的Property优先.如果都为Null则返回Default值,如果内容不为true/
* false则返回false.
*/
public static Boolean getBoolean(String key, boolean defaultValue) {
String value = getValue(key);
return value != null ? Boolean.valueOf(value) : defaultValue;
}


/**
* 载入多个文件, 文件路径使用Spring Resource格式.
*/
private static Properties loadProperties(String... resourcesPaths) {
Properties props = new Properties();


for (String location : resourcesPaths) {


// logger.debug("Loading properties file from:" + location);


InputStream is = null;
try {
Resource resource = resourceLoader.getResource(location);
is = resource.getInputStream();
props.load(is);
} catch (IOException ex) {
logger.info("Could not load properties from path:" + location + ", " + ex.getMessage());
} finally {
com.alibaba.fastjson.util.IOUtils.close(is);
}
}
return props;
}
}
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