JAVA自学教程之IO流(九)文件切割合成器实例源码。
文件切割器
- private static final int SIZE = 1024 *1024;
- public static void splitFile(File file) throws IOException{
- //用读取流关联文件(不确定文件格式)
- FileInputStream fis = new FileInputStream(file);//源是一个
- byte[] by = new byte[SIZE];//定义1M的缓冲区
- FileOutputStream fos = null;//汇不知道有多少个
- int len = 0;
- int count = 1;//记录子文件个数
- File dir = new File(“D:\\patFiles”);
- if(!dir.isFile()){
- dir.mkdirs();
- }
- while((len = fis.read(by))!=-1){
- fos = new FileOutputStream(new File(dir,(count++)+”.part”));//自定义文件格式
- fos.write(by,0,len);
- }
- fos.close();
- fis.close();
- }
文件合并
- public static void main(String[] args) throws IOException {
- File file = new File(“D:\\PartFile”);
- Merge(file);
- }
- public static void Merge(File dir)throws IOException{
- ArrayList<FileInputStream> AL = new ArrayList<FileInputStream>();
- for(int i = 1;i<=7;i++){
- AL.add(new FileInputStream(new File(dir,i+”.part”)));
- }
- Enumeration<FileInputStream> en = Collections.enumeration(AL);
- SequenceInputStream sis = new SequenceInputStream(en);
- FileOutputStream fos = new FileOutputStream(new File(dir,”盛夏光年.mp3″));
- byte[] by = new byte[1024];
- int len = 0;
- while((len = sis.read(by))!=-1){
- fos.write(by, 0, len);
- }
- sis.close();
- fos.close();
- }
文件切割合并+配置文件
- import java.io.*;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.Enumeration;
- import java.util.Properties;
- public class Main
- {
- private static final int SIZE = 1024 *1024;
- public static void main(String[] args) throws IOException {
- File file1 = new File(“d:\\NeedSplit\\盛夏光年.mp3″);
- File file2 = new File(“D:\\PartFiles”);
- splitFile(file1);
- Merge_1(file2);
- }
- public static void splitFile(File file) throws IOException{
- //用读取流关联文件(不确定文件格式)
- FileInputStream fis = new FileInputStream(file);//源是一个
- byte[] by = new byte[SIZE];//定义1M的缓冲区
- FileOutputStream fos = null;//汇不知道有多少个
- int len = 0;
- int count = 1;//记录子文件个数
- /*切割文件必须要记录切割文件的名称和切割处理的碎片文件的个数,方便合并
- * 这个信息为了进行描述,使用键值对的方法,所以使用Properties对象*/
- Properties pro = new Properties();
- File dir = new File(“D:\\PartFiles”);
- if(!dir.isFile()){
- dir.mkdirs();
- }
- while((len = fis.read(by))!=-1){
- fos = new FileOutputStream(new File(dir,(count++)+”.part”));//自定义文件格式
- fos.write(by,0,len);
- fos.close();
- }
- //将切割后文件的信息保存在pro集合中
- pro.setProperty(“partCount”, count+”");
- pro.setProperty(“fileName”, file.getName());
- fos = new FileOutputStream(new File(dir,count+”.properties”));
- //将pro集合的信息存储在集合中
- pro.store(fos, ”save file infmation”);
- fis.close();
- }
- public static void Merge_1(File dir)throws IOException{
- //获取指定目录下配置文件对象
- File[] files = dir.listFiles(new SuffixFilter(“.properties”));//new一个过滤器
- if(files.length!=1){
- throw new RuntimeException(dir+”该目录下没有properties扩展名的文件或者不唯一 ”);
- }
- //记录配置文件对象
- File confile = files[0];
- //获取配置文件信息
- Properties pro = new Properties();
- FileInputStream fis = new FileInputStream(confile);//关联流对象
- pro.load(fis);//加载信息
- String filename = pro.getProperty(“fileName”);//得到文件名
- int count = Integer.parseInt(pro.getProperty(“partCount”));//得到碎片个数
- //获取该目录下的所有碎片文件
- //定义过滤器,判断碎片文件的个数与配置信息中的碎片信息是否一致
- File[] partFiles = dir.listFiles(new SuffixFilter(“.part”));
- if(partFiles.length!=(count-1)){
- throw new RuntimeException(“碎片文件个数不对,应是”+count+”个!”);
- }
- //将碎片文件和流对象关联,并存储集合中
- ArrayList<FileInputStream> AL = new ArrayList<FileInputStream>();
- for(int i = 0;i<partFiles.length;i++){
- AL.add(new FileInputStream(partFiles[i]));
- }
- //将多个流合并成一个序列流
- Enumeration<FileInputStream> en = Collections.enumeration(AL);
- SequenceInputStream sis = new SequenceInputStream(en);
- //读写过程
- FileOutputStream fos = new FileOutputStream(new File(dir,filename));
- byte[] by = new byte[1024];
- int len = 0;
- while((len = sis.read(by))!=-1){
- fos.write(by, 0, len);
- }
- sis.close();
- fos.close();
- }
- }