Java之IO（三）SequenceInputStream

package cn.itcast.other;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.SequenceInputStream;import java.util.ArrayList;import java.util.Enumeration;import java.util.Vector;/*SequenceInputStream(序列流)     需求：把a.txt与b.txt 文件的内容合并。 */public class Demo1 {public static void main(String[] args) throws IOException {merge3();}//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();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();}//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();}//需求：把a.txt与b.txt 文件的内容合并。public static void merge1() 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);//把输入流存储到集合中，然后再从集合中读取ArrayList<FileInputStream> list = new ArrayList<FileInputStream>();list.add(fileInputStream1);list.add(fileInputStream2);//准备一个缓冲数组byte[] buf = new byte[1024];int length = 0 ; for(int i = 0 ; i< list.size() ; i++){FileInputStream fileInputStream = list.get(i);while((length = fileInputStream.read(buf))!=-1){fileOutputStream.write(buf,0,length);}//关闭资源fileInputStream.close();}fileOutputStream.close();}}

package cn.itcast.other;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.SequenceInputStream;import java.util.Enumeration;import java.util.Vector;/*  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MP3public 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();}}