I/O流讀寫文件

 讀取文件

public String readFile(String filePath){
    	String str = "";//用來保存讀取的內容
    	StringBuffer buffer = new StringBuffer(str);//使用StringBuffer來拼接字符串
    	FileInputStream fis = null;
    	BufferedInputStream bis = null;
		try {
			fis = new FileInputStream(new File(filePath));
			bis = new BufferedInputStream(fis);
			int len = 0;
			byte[] temp = new byte[1024];
			while((len = bis.read(temp)) != -1){
				buffer.append(new String(temp, 0, len));
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				fis.close();
				bis.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
    	
    	return buffer.toString();
    }

寫入文件 

public void writeFile(String str, String filePath){
    	BufferedOutputStream bos = null;
    	FileOutputStream fos = null;
    	File file = null;
    	try{
    		file = new File(filePath);
    		if(!file.exists() && file.isDirectory()){//如果文件不存在並且是一個文件夾
    			file.mkdirs();
    		}
    		fos = new FileOutputStream(file);
    		bos = new BufferedOutputStream(fos);
    		bos.write(str.getBytes());
    	} catch(Exception e) {
    		e.printStackTrace();
    	} finally {
    		try {
				fos.close();
				bos.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    }