Android数据储存之File

/**
	 * 读
	 * @return
	 */
	public String read(){
		try {
			//打开输入流
			FileInputStream fileInputStream = openFileInput(name);
			//创建byte数组
			byte[] buffer = new byte[1034];
			int i = 0;
			//创建StringBuilder 对象
			StringBuilder builder = new StringBuilder();
			//循环读取fileInputStream中的字节
			while ((i =fileInputStream.read(buffer)) > 0) {
				builder.append(new String(buffer, 0, i));
			}
			//关闭输入流
			fileInputStream.close();
			//返回输入流中的字符串
			return builder.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

/**
	 * 写
	 * @param str 文件中的字符串（内容）
	 */
	public void write(String str){
		try {
			//获取输出流对象，已追加的方式打开输出流
			FileOutputStream fileOutputStream = openFileOutput(name, MODE_PRIVATE);
			//将输出流封装成PrintStream对象
			PrintStream printStream = new PrintStream(fileOutputStream);
			//输出写入内容
			printStream.print(str);
			//关闭输出流
			printStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}