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) {
	
}

}