java中读取服务器配置文件方法

在程序开发和设计中，我们经常把一些需要改变的数值配置在文件中，方便手动的去修改数据，如果写死在java程序中，并不方便维护和先关参数的修改。在文件中存储数据，直接使用a=b这样的方式存储即可。下面是读取并解析文件的方法。

package com.jhinno.appportal.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

public class ConfigUtil {
    private static ConfigUtil instance = new ConfigUtil();
    private Logger logger = LogManager.getLogger(ConfigUtil.class);
    private Map<String,Properties> configMappings;
    public static final String FILE_PATH = System.getenv("FILEPATH") + File.separator + "file.conf";
    
    private ConfigUtil(){
        configMappings = new HashMap<String,Properties>();
    }
    
    public static ConfigUtil getInstance(){
        if(instance == null){
            instance = new ConfigUtil();
        }
        
        return instance;
    }

    public String getConfigByKey(String filename, String key){
        Properties p = null;
        String value = null;
        
        if(configMappings.containsKey(filename)){
            p = configMappings.get(filename);
            value = p.getProperty(key);
        }else{
            p = loadProperties(filename);
            value = p.getProperty(key);
            configMappings.put(filename, p);
        }
        
        return value;
    }
    
    
    public Map<String, Properties> getConfigMappings() {
        return configMappings;
    }

    public void setConfigMappings(Map<String, Properties> configMappings) {
        this.configMappings = configMappings;
    }

    private Properties loadProperties(String filename){
        Properties p = new Properties();
        FileInputStream is = null;
        
        try {
            is = new FileInputStream(new File(filename));
            p.load(is);
            is.close();
        } catch (IOException e) {
            logger.error("ERROR:",e);
            try {
                is.close();
            } catch (IOException e1) {
                logger.error("ERROR:",e1);
            }  
        }
        
        return p;
    }

}
文章转自IT家园http://wgyblog.com/html/artcode/207.html