IO 文件合并

来源：互联网发布：linux vlan 编辑：程序博客网时间：2024/04/29 15:44
package com.zyf.day22;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;//合并文件public class demo1 {    public static void main(String[] args) throws IOException {    merge3();}        public static void merge1() throws IOException{    //找到目标文件    File inFile1 = new File("c:\\a.txt");    File inFile2 = new File("c:\\b.txt");    File outFile = new File("c:\\c.txt");    //建立数据的输入输出通道    FileInputStream fileInputStream1 = new FileInputStream(inFile1);    FileInputStream fileInputStream2 = new FileInputStream(inFile2);    FileOutputStream fileOutputStream = new FileOutputStream(outFile);            ArrayList<FileInputStream> list = new ArrayList<FileInputStream>();    list.add(fileInputStream1);    list.add(fileInputStream2);        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();    }    public static void merge2() throws IOException{    //找到目标文件    File inFile1 = new File("c:\\a.txt");    File inFile2 = new File("c:\\b.txt");    File outFile = new File("c:\\c.txt");    //建立数据的输入输出通道    FileInputStream fileInputStream1 = new FileInputStream(inFile1);    FileInputStream fileInputStream2 = new FileInputStream(inFile2);    FileOutputStream fileOutputStream = new FileOutputStream(outFile);        //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();    }        public static void merge3() throws IOException{    //找到目标文件    File inFile1 = new File("c:\\a.txt");    File inFile2 = new File("c:\\b.txt");    File inFile3 = new File("c:\\d.txt");    File outFile = new File("c:\\c.txt");    //建立数据的输入输出通道    FileInputStream fileInputStream1 = new FileInputStream(inFile1);    FileInputStream fileInputStream2 = new FileInputStream(inFile2);    FileInputStream fileInputStream3 = new FileInputStream(inFile3);        FileOutputStream fileOutputStream = new FileOutputStream(outFile);    //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();        }}
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