java項目加載配置文件的工具類

package com.loadproperties;

import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;

public class ConfigUtil {

private static InputStream input;

private volatile Properties configuration = new Properties();

//弄成單例的

private static ConfigUtil config;

public static ConfigUtil getInstance(String path){

if(config==null)

{

config=new ConfigUtil(path);

}

return config;

}

//構造函數內完成了加載配置文件

private ConfigUtil(String path)

{

input =this.getClass().getResourceAsStream(path);

this.configuration.clear();

try {

this.configuration.load(input);

} catch (IOException e) {

System.out.println(e.getMessage());

e.printStackTrace();

}

}

public String getStringValue(String key) throws IOException

{

return this.configuration.getProperty(key);

}

public String getStringValue(String key, String defaultValue)

{

String value = this.configuration.getProperty(key);

if (value == null) {

return defaultValue;

} else {

return value;

}

}

public void setConfiguration(String key, String value)

{

this.configuration.setProperty(key, value);

}

public static void main(String[] args) throws IOException {

String path="/com/loadproperties/log4j.properties";

System.out.println(config.getInstance(path).getStringValue("log4j.rootLogger"));

}

}