第十二章：IO流

	/*
	 * 将读取文件内容的gbk的编码集在写入文件时转成UTF-8编码集
	 * 注意 ： 读取文件内容的编码集和InputStreamReader中设置的编码集必须相同
	 */
	@Test
	public void test15() throws Exception{
		FileInputStream fileInputStream = new FileInputStream("123.txt");
		InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
		FileOutputStream fileOutputStream = new FileOutputStream("888.txt");
		OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream,"utf-8");
		char[] c = new char[1024];
		int read = 0;
		while((read = inputStreamReader.read(c)) != -1){
			System.out.println(new String(c,0,read));
			outputStreamWriter.write(c,0,read);
			outputStreamWriter.write("abc爱我中华");
		}
		inputStreamReader.close();
		outputStreamWriter.close();
		fileInputStream.close();
		fileOutputStream.close();
	}

	/*
	 * 转换流
	 * 作用：
	 * 1.可以对字节流和字符流进行转换
	 * 2.可以改变写出内容的编码集
	 * 
	 */
	@Test
	public void test14() throws Exception{
		FileInputStream fileInputStream = new FileInputStream("123.txt");
		InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
		FileOutputStream fileOutputStream = new FileOutputStream("111000.txt");
		OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);
		char[] c = new char[1024];
		int read = 0;
		System.out.println("--------");
		while((read = inputStreamReader.read(c)) != -1){
			System.out.println(new String(c,0,read));
			outputStreamWriter.write(c,0,read);
			
		}
		inputStreamReader.close();
		outputStreamWriter.close();
		fileInputStream.close();
		fileOutputStream.close();
	}

	/*
	 * 写内容
	 * 
	 */
	@Test
	public void test13() throws Exception{
		FileWriter writer = new FileWriter("999.txt");
		writer.write("中国我爱你哈哈哈哈");
		writer.close();
	}
	/*
	 * 字符流 : 不能用来复制文件。
	 * FileReader
	 * 读取文件内容
	 */
	@Test
	public void test12() throws Exception{
		FileReader reader = new FileReader("5656.txt");
		char[] c = new char[100];
		int len = 0;
		while((len = reader.read(c)) != -1){
			System.out.println(new String(c,0,len));
		}
		reader.close();
	}

	/**
	 * 中文乱码
	 * @throws Exception
	 */
	@Test
	public void test11() throws Exception{
			//1.创建File对象
			File file = new File("5656.txt");
			//2.创建流的对象
			FileInputStream fis = new FileInputStream(file);
			//3.读取内容
			byte[] b = new byte[20]; //用来装数据
			
			int len = 0; //读取的内容的长度
			
			while((len = fis.read(b)) != -1){
				
				for (byte c : b) {
					System.out.println((char)c);
				}
			}
			//4.关流
			fis.close();
	}

@Test
	public void test10(){
		System.out.println("");
		long stat = System.currentTimeMillis();
		/*try {
			copy1("E:\\录屏视频\\自己类库的创建与API文档生成及注意事项.mp4","C:\\Users\\Administrator\\Desktop\\a.map4");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		long end = System.currentTimeMillis();
		System.out.println(end - stat);//64313
*/		System.out.println("-------------------");
		long currentTimeMillis = System.currentTimeMillis();
		/*try {
			copy2("E:\\录屏视频\\自己类库的创建与API文档生成及注意事项.mp4","C:\\Users\\Administrator\\Desktop\\a.map4");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}*/
		long currentTimeMillis2 = System.currentTimeMillis();
		long sum = currentTimeMillis2 - currentTimeMillis;
		System.out.println(sum);//52222
	}
	public void copy2(String start,String end) throws Exception{
		FileInputStream fileInputStream = null;
		FileOutputStream fileOutputStream = null;
		BufferedInputStream bufferedInputStream = null;
		BufferedOutputStream bufferedOutputStream = null;
		try {
			File file = new File(start);
			File file2 = new File(end);
			fileInputStream = new FileInputStream(file);
			fileOutputStream = new FileOutputStream(file2);
			bufferedInputStream = new BufferedInputStream(fileInputStream);
			bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
			byte[] b = new byte[20];
			int read = 0;
			while((read = bufferedInputStream.read(b)) != -1){
				System.out.println(new String(b,0,read));
				bufferedOutputStream.write(b,0,read);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{			
			try {
				bufferedInputStream.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				bufferedOutputStream.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				fileInputStream.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				fileOutputStream.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	public void copy1(String start,String end) throws Exception{
		FileInputStream fileInputStream = null;
		FileOutputStream fileOutputStream = null;
		try {
			File file = new File(start);
			File file2 = new File(end);
			fileInputStream = new FileInputStream(file);
			fileOutputStream = new FileOutputStream(file2);
			byte[] b = new byte[20];
			int read = 0;
			while((read = fileInputStream.read(b)) != -1){
				System.out.println(new String(b,0,read));
				fileOutputStream.write(b, 0, read);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			fileInputStream.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			fileOutputStream.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

//缓存流
@Test
public void test9() throws Exception{
   File file = new File("456.txt");
   FileOutputStream fileOutputStream = new FileOutputStream(file);
   BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
   bufferedOutputStream.write("ssss".getBytes());
   bufferedOutputStream.close();
   fileOutputStream.close();
}
	@Test
	public void test8() throws Exception{
		File file = new File("123.txt");
		file.createNewFile();
		FileInputStream fileInputStream = new FileInputStream(file);
		BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
		byte[] b = new byte[10];
		int read = 0;
		while((read = bufferedInputStream.read(b)) != -1){
			System.out.println(new String(b,0,read));
		}
		bufferedInputStream.close();
		fileInputStream.close();//关流 : 先关外面的再关里面的
	}
	//FileOutputStream : 向文件中写内容
	/**
	 * 复制图片
	 * @throws Exception
	 */
	@Test
	public void test7() throws Exception{
		FileInputStream fileInputStream = null;
		FileOutputStream fileOutputStream = null;
		try {
			File file = new File("1.jpg");
			fileInputStream = new FileInputStream(file);
			fileOutputStream = new FileOutputStream(new File("6.jpg"));
			byte[] b = new byte[1024];
			int read = 0;
			while((read = fileInputStream.read(b)) != -1){
				System.out.println(new String(b,0,read));
				fileOutputStream.write(b,0,read);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{			
			try {
				if(fileInputStream != null){					
					fileInputStream.close();
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				if(fileOutputStream != null){					
					fileOutputStream.close();
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	/**
	 * 一边读一边写
	 * @throws Exception
	 */
	@Test
	public void test6() throws Exception{
		FileInputStream fileInputStream = null;
		FileOutputStream fileOutputStream = null;
		try {
			File file = new File("123.txt");
			fileInputStream = new FileInputStream(file);
			fileOutputStream = new FileOutputStream(new File("456.txt"));
			byte[] b = new byte[20];
			int read = 0;
			while((read = fileInputStream.read(b)) != -1){
				System.out.println(new String(b,0,read));
				fileOutputStream.write(b,0,read);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{			
			try {
				if(fileInputStream != null){					
					fileInputStream.close();
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				if(fileOutputStream != null){					
					fileOutputStream.close();
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

/**
	 * 写文件
	 * @throws Exception
	 */
	@Test
	public void test5() throws Exception{
		File file = new File("123.txt");
		FileOutputStream fileOutputStream = new FileOutputStream(file);
		fileOutputStream.write("abc".getBytes());
		fileOutputStream.close();
	}
	/**
	 * try-catch-finally
	 */
	@Test
	public void test4(){
		FileInputStream fileInputStream = null;
		try {
			File file = new File("123.txt");
			fileInputStream = new FileInputStream(file);
			byte[] b = new byte[10];
			int read = 0;
			while((read = fileInputStream.read(b)) != -1){
				System.out.println(new String(b,0,read));
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				if(fileInputStream != null){					
					fileInputStream.close();
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

//FileInputStream : 从文件中读取内容
	/**
	 * 第一种方式
	 * @throws Exception
	 */
	@Test
	public void test1() throws Exception{
		File file = new File("123.txt");
		FileInputStream fileInputStream = new FileInputStream(file);
	    int read = fileInputStream.read();
	    while(read != -1){
	    	System.out.println((char)read);
	    	read = fileInputStream.read();
	    }
	    fileInputStream.close();
	}
	/**
	 * 第二种方式
	 * @throws Exception
	 */
	@Test
	public void test2() throws Exception{
		File file = new File("123.txt");
		FileInputStream fileInputStream = new FileInputStream(file);
		byte[] b = new byte[20];
		int read = fileInputStream.read(b);
		while(read != -1){
			/*for (int i = 0; i < b.length; i++) {				
				//System.out.print(b[i] + " ");//97 98 99 100 101 102 103 0 0 0 0 0 0 0 0 0 0 0 0 0 
				System.out.print((char)b[i] + " ");//a b c d e f g 
			}*/
			for (byte c : b) {				
				System.out.print((char)c + " ");//a b c d e f g 
			}
			String string = new String(b,0,read);//将数组转成字符串
			System.out.println(string);
			read = fileInputStream.read(b);
		}
		fileInputStream.close();
	}
	/**
	 * 第三种方式
	 * @throws Exception
	 */
	@Test
	public void test3() throws Exception{
		File file = new File("123.txt");
		FileInputStream fileInputStream = new FileInputStream(file);
		byte[] b = new byte[10];
		int read = 0;
		while((read = fileInputStream.read(b)) != -1){
			System.out.println(new String(b,0,read));
		}
		fileInputStream.close();
	}