文件读取工具类读取properties文件

1、创建工具类

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

/**
 * 
* 类名称：PropertiesUtil   
* 类描述： 文件读取类
* 创建人：Jxufe HeHaiYang
* 创建时间：2015-1-20 下午03:14:02     
* 修改备注：   
* @version
 */
public class PropertiesUtil {    

    private static Properties properties=new Properties();
    
    private static PropertiesUtil propertiesUtil;
    
    private PropertiesUtil(){        
    }
    
    private static void loadFile(String filename){
        try {
            properties.load(PropertiesUtil.class.getResourceAsStream("/"+filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static synchronized PropertiesUtil createPropertiesUtil(String filename){
        if (propertiesUtil==null) {
            propertiesUtil=new PropertiesUtil();
        }
        loadFile(filename);
        return propertiesUtil;
    }    
    
    public String getProperty(String key){
        return properties.getProperty(key);
    }

    public static void main(String[] args) {
        PropertiesUtil propertiesUtil=PropertiesUtil.createPropertiesUtil("upload.properties");        
        System.out.println(propertiesUtil.getProperty("path"));
    }
}

2、使用全局变量

/**
 * 
* 类名称：Constant   
* 类描述： 全局静态变量
* 创建人：Jxufe HeHaiYang
* 创建时间：2015-1-21 下午01:53:47     
* 修改备注：   
* @version
 */
public class Constant {

    public static final String UPLOADPATH_FILE="upload.properties";
    
    public static final String UPLOADPATH_PATH="path";
    
}

3、调用工具类

读取定义的upload.properties文件
    PropertiesUtil pUtil = PropertiesUtil
        .createPropertiesUtil(Constant.UPLOADPATH_FILE);
取出定义的path的值
        pUtil.getProperty(Constant.UPLOADPATH_PATH);