序列流SequenceInputStream

//	使用SequenceInputStream合并文件。
	public static void merge2() throws IOException{
		//找到目标文件
		File inFile1 = new File("F:\\a.txt");
		File inFile2 = new File("F:\\b.txt");
		File outFile = new File("F:\\c.txt");
		//建立数据的输入输出通道
		FileOutputStream fileOutputStream = new FileOutputStream(outFile);
		
		FileInputStream fileInputStream1 = new FileInputStream(inFile1);
		FileInputStream fileInputStream2 = new FileInputStream(inFile2);
		//建立序列流对象
		SequenceInputStream inputStream = new SequenceInputStream(fileInputStream1,fileInputStream2);
		byte[] buf = new byte[1024];
		int length = 0 ; 
		
		while((length = inputStream.read(buf))!=-1){
			fileOutputStream.write(buf,0,length);
		}
		//关闭资源
		inputStream.close();
		fileOutputStream.close();

	}

使用Vector迭代器辅助合并两个以上的文件

	//把三个文件合并成一个文件
	public static void merge3() throws IOException{
		//找到目标文件
		File file1 = new File("F:\\a.txt");
		File file2 = new File("F:\\b.txt");
		File file3 = new File("F:\\c.txt");
		File file4 = new File("F:\\d.txt");
		
		
		//建立对应 的输入输出流对象
		FileOutputStream fileOutputStream = new FileOutputStream(file4);
		FileInputStream fileInputStream1 = new FileInputStream(file1);
		FileInputStream fileInputStream2 = new FileInputStream(file2);
		FileInputStream fileInputStream3 = new FileInputStream(file3);

		//创建序列流对象
		Vector<FileInputStream> vector = new Vector<FileInputStream>();
		vector.add(fileInputStream1);
		vector.add(fileInputStream2);
		vector.add(fileInputStream3);
		Enumeration<FileInputStream> e = vector.elements();//elements返回对象的枚举

		SequenceInputStream sequenceInputStream = new SequenceInputStream(e);
		
		//读取文件数据
		byte[] buf = new byte[1024];
		int length = 0; 
		
		while((length = sequenceInputStream.read(buf))!=-1){
			fileOutputStream.write(buf,0,length);
		}
		
		//关闭资源
		sequenceInputStream.close();
		fileOutputStream.close();
		
	}
	

练习

需求： 把一首mp3先切割成n份，然后再把这些文件合并起来。

public class Demo2 {

	public static void main(String[] args) throws IOException {
//		cutFile();
		mergeFlile();
	}
	
	//合并
	public static void mergeFlile() throws IOException{
		//找到目标文件
		File dir = new File("F:\\music");
		//通过目标文件夹找到所有的MP3文件，然后把所有的MP3文件添加到vector中。
		Vector<FileInputStream> vector = new Vector<FileInputStream>();
		File[] files = dir.listFiles();
		for(File file : files){
			if(file.getName().endsWith(".mp3")){
				vector.add(new FileInputStream(file));
			}
		}
		//通过Vector获取迭代器
		Enumeration<FileInputStream> e = vector.elements();
		//创建序列流
		SequenceInputStream inputStream = new SequenceInputStream(e);
		//建立文件的输出通道
		FileOutputStream fileOutputStream = new FileOutputStream("F:\\合并.mp3");
		//建立缓冲数组读取文件
		byte[] buf = new byte[1024];
		int length = 0 ; 
		while((length =  inputStream.read(buf))!=-1){
			fileOutputStream.write(buf,0,length);
		}
		//关闭资源
		fileOutputStream.close();
		inputStream.close();
		
	}
	
	
	
	//切割MP3
	public static void cutFile() throws IOException{
		File file = new File("F:\\美女\\1.mp3");
		//目标文件夹
		File dir = new File("F:\\music");
		//建立数据的输入通道
		FileInputStream fileInputStream = new FileInputStream(file);
		//建立缓冲数组读取
		byte[] buf = new byte[1024*1024];
		int length = 0;
		for(int i = 0 ;  (length = fileInputStream.read(buf))!=-1 ; i++){
			FileOutputStream fileOutputStream =	new FileOutputStream(new File(dir,"part"+i+".mp3"));
			fileOutputStream.write(buf,0,length);
			fileOutputStream.close();
		}
		//关闭资源
		fileInputStream.close();
	}
	
	
}