序列流整合多个（了解）

序列流整合多个（了解）

• 整合多个：SequenceInputStream(Enumeration)

    FileInputStream fis1 = new FileInputStream("a.txt");	//创建输入流对象,关联a.txt
    FileInputStream fis2 = new FileInputStream("b.txt");	//创建输入流对象,关联b.txt
    FileInputStream fis3 = new FileInputStream("c.txt");	//创建输入流对象,关联c.txt
    Vector<InputStream> v = new Vector<>();				//创建vector集合对象
    v.add(fis1);											//将流对象添加
    v.add(fis2);
    v.add(fis3);
    Enumeration<InputStream> en = v.elements();			//获取枚举引用
    SequenceInputStream sis = new SequenceInputStream(en);//传递给SequenceInputStream构造
    FileOutputStream fos = new FileOutputStream("d.txt");
    int b;
    while((b = sis.read()) != -1) {
    	fos.write(b);
    }
    sis.close();
    fos.close();
  

package com.heima.otherio;

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;

public class Demo01_SequenceInputStream {

	/**
	 * @param args
	 * 整合多个输入流
	 * SequenceInputStream(Enumeration<? extends InputStream> e)
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		FileInputStream fis1 = new FileInputStream("a.txt");
		FileInputStream fis2 = new FileInputStream("b.txt");
		FileInputStream fis3 = new FileInputStream("c.txt");
		
		Vector<FileInputStream> v = new Vector<>();					//创建集合对象
		v.add(fis1);												//将流对象存储进来
		v.add(fis2);
		v.add(fis3);
		
		Enumeration<FileInputStream> en = v.elements();
		SequenceInputStream sis = new SequenceInputStream(en);		//将枚举中的输入流整合成一个
		FileOutputStream fos = new FileOutputStream("d.txt");
		
		int b;
		while((b = sis.read()) != -1) {
			fos.write(b);
		}
		
		sis.close();
		fos.close();
	}
}