java读写properties工具代码

package test612;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Properties;

public class Tool {

public static String read(String key){

String dd = null;

Properties prop = new Properties();

InputStream fis = null;

String rootPath = System.getProperty("user.dir").replace("\", "/");

        try {
            File file = new File(rootPath+"/house.properties");
            if (!file.exists())
                file.createNewFile();
            fis = new FileInputStream(rootPath+"/house.properties");
            prop.load(fis);
            fis.close();//一定要在修改值之前关闭fis
          dd=prop.getProperty(key);
        } catch (IOException e) {
        }
        finally{
            try {  
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return dd;
}
 public static void write(String key,String value){
	 Properties prop = new Properties();
	 String rootPath = System.getProperty("user.dir").replace("\\", "/");
        OutputStream os = null;
        try {
            prop.setProperty(key, value);
            try {
            	os = new FileOutputStream(rootPath+"/house.properties",true);
            	prop.store(os, "comments for main2");
            	os.flush();
            	} catch (FileNotFoundException e) {
            	e.printStackTrace();
            	} catch (IOException e) {
            	e.printStackTrace();
            	}
        }
        finally{
            try {
                os.close();  
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
 }
 public static void main(String[] args) {
}

}