5、(知识篇)IO流（2）

最新推荐文章于 2025-01-01 17:42:28 发布

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最新推荐文章于 2025-01-01 17:42:28 发布

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分类专栏： JAVA知识类相关文章标签： io流 IO

本文链接：https://blog.youkuaiyun.com/leaderrida/article/details/53012008

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本文提供了一个Java程序示例，展示了如何使用缓冲流进行文件读取、写入及复制的操作。其中包括使用BufferedReader和BufferedWriter处理文本文件，以及使用BufferedInputStream和BufferedOutputStream复制二进制文件。

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public class Test {
	
	/**
	 * 缓冲流
	 * @throws IOException
	 */
	public static void testBufferReader() throws IOException{
		BufferedReader reader = new BufferedReader(new FileReader("D:\\Hello.txt"));
		char[] c = new char[1024];
		String str = null;
		while((str=reader.readLine())!= null){
			System.out.println(str);
		}
		reader.close();
	}
	
	/**
	 * 缓冲流输出
	 * @throws IOException
	 */
	public static void testBufferWriter() throws IOException{
		BufferedWriter writer = new BufferedWriter(new FileWriter("D:\\Hello2.txt"));
		writer.write("Hello");
		writer.flush();
		writer.close();
	}
	
	
	/**
	 * 复制文本文档用字符流操作
	 * @throws IOException
	 */
	public static void copyTxt() throws IOException{
		BufferedReader reader = new BufferedReader(new FileReader("D:\\Hello.txt"));
		BufferedWriter writer = new BufferedWriter(new FileWriter("D:\\Hello2.txt"));
		char[] c = new char[1024];
		int len = 0;
		while((len = reader.read(c))!=-1){
			writer.write(c,0,len);
		}
		writer.flush();
		writer.close();
		reader.close();
	}
	
	/**
	 * 复制文件
	 * @throws IOException 
	 */
	public static void copyFile() throws IOException{
		BufferedInputStream input = new BufferedInputStream(new FileInputStream(new File("D:\\93_174426_8a64e.jpg")));
		BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream("D:\\93_174426_8a64e2.jpg"));
		byte[] b = new byte[1024];
		int len = 0;
		while ((len = input.read(b))!=-1) {
			output.write(b,0,len);
		}
		output.flush();
		output.close();
		input.close();
	}
	
	
	public static void main(String[] args) throws IOException {
		testBufferReader();
		testBufferWriter();
		copyTxt();
		copyFile();
	}
}