SequenceInputStream

 

package file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.util.Enumeration;
import java.util.Vector;

public class Demo9 {
    public static void main(String[] args) throws IOException {
//        merge1();
        merge2();
    }
    
    
    //把三个文件合并
    public static void merge2() throws IOException {
        //找到目标文件
        File inFile1 = new File("F:\\1.txt");
        File inFile2 = new File("F:\\2.txt");
        File inFile3 = new File("F:\\3.txt");
        File outFile = new File("F:\\a.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);
        FileInputStream fileInputStream3 = new FileInputStream(inFile3);
        
        //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);
        }
        sequenceInputStream.close();
        fileOutputStream.close();
    }
    
    //使用SequenceInputStream合并
    public static void merge1() throws IOException {
        //找到目标文件
        File inFile1 = new File("F:\\2.txt");
        File inFile2 = new File("F:\\a.txt");
        File outFile = new File("F:\\1.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();
    }
}