package com;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.*;

/**
 * properties文件读写工具
 * Created by charlin on 2017/9/9.
 */
public class PropertiesUtil {

    private static String fileName = "conf/messages.properties";
    private static String configFilePath = null;
    static {
        try {
            configFilePath = PropertiesUtil.class.getClassLoader().getResource(fileName).getPath();
            configFilePath = java.net.URLDecoder.decode(configFilePath, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    /**
     * 获得文件路径
     * @param fileName
     * @return
     */
    public static String getFilePath(String fileName){
        try {
            configFilePath = PropertiesUtil.class.getClassLoader().getResource(fileName).getPath();
            configFilePath = java.net.URLDecoder.decode(configFilePath, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return configFilePath;
    }

    /**
     * 根据key获得值
     * @param key
     * @return
     */
    public static String getValue(String key, String fileName){
        String value = null;
        try {
            Properties properties = new Properties();
            FileInputStream fis = new FileInputStream(getFilePath(fileName));
            properties.load(fis);
            if (fis != null) fis.close();
            if(properties.containsKey(key)){
                value = properties.getProperty(key).trim();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  value;
    }

    /**
     * 获得默认值
     * @param key
     * @return
     */
    public static String getValue(String key){
        return getValue(key, getFilePath(fileName));
    }

    /**
     * 获得所有的key
     * @param fileName
     * @return
     */
    public static List getKeyList(String fileName){
        List list = new ArrayList();
        try {
            Properties properties = new Properties();
            FileInputStream fis = new FileInputStream(getFilePath(fileName));
            properties.load(fis);
            if (fis != null) fis.close();
            Set set = properties.keySet();
            for(Iterator it = set.iterator(); it.hasNext();){
                list.add(it.next());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  list;
    }

    public static void main(String[] args) {
        List list = getKeyList(fileName);
        System.out.println("list:"+list);
    }
}