import java.io.*;
class FileDemo1
{public static void main(String[] args) {method1();}public static void method1(){//创建File对象File f1=new File("a.txt");//第二种File f2=new File("d:\\abc","b.txt");//第三种File dir=new File("d:\\bcd");File f3=new File(dir,"c.txt");//使用分隔符File f4=new File("d:"+File.separator+"abc"+File.separator+"d.txt");//输出System.out.println("f1="+f1);//a.txtSystem.out.println("f2="+f2);//d:\abc\b.txtSystem.out.println("f3="+f3);//d:\bcd\c.txtSystem.out.println("f4="+f4);//d:\abc\d.txt
}
}

//创建文件，在指定位置创建文件，如果该文件已经存在，则不创建，返回 falsepublic static void method1() throws IOException{File f=new File("d:\\file.txt");//创建sop("create: "+f.createNewFile());//删除，删除失败返回false//sop("delete:"+f.delete());//在退出时删除指定文件
        f.deleteOnExit();}

package com.pb.day20.io.file;import java.io.File;
import java.io.IOException;public class FileDemo2 {public static void main(String[] args) throws IOException {File f1=new File("d:\\a.txt");File f2=new File("e:\\c.txt");File dir1=new File("d:\\dbc");File dir2=new File("d:\\dbc\\dd\\aa\\d\\f\\dsf\\fsd");//判断文件是否存在，不存在就创建if(!f1.exists()){f1.createNewFile();}//判断文件夹是否存在if(!dir1.exists()){dir1.mkdir();//创建一层文件夹
        }//创建多层文件夹if(!dir2.exists()){dir2.mkdirs();}//判断sop("f1是文件吗?"+f1.isFile());sop("dir1是文件夹吗?"+dir1.isDirectory());sop("f1是可执行文件吗？"+f1.canExecute());sop("f1可读吗？"+f1.canRead());sop("f1可写吗？"+f1.canWrite());sop("f1是隐藏文件吗?"+f1.isHidden());//获取文件信息sop(f1.getName());//文件名sop(f1.getPath());//相对路径sop(f1.getAbsolutePath());//获取绝对路径,返回值是字符串sop(f1.getAbsoluteFile());//获取绝对路径,返回值是File类对象sop(f1.lastModified());//最后修改时间 长整型sop(f1.length());//文件字节大小，长整型//重命名sop(f1.renameTo(f2));//剪切的作用
        }public static void sop(Object obj){System.out.println(obj);}}

package com.pb.day20.io.file;import java.io.File;
import java.io.FilenameFilter;public class FileDemo3 {public static void main(String[] args) {method3();}//列出当前目录下的指定文件public static void method3(){File f=new File("d:\\");File [] files=f.listFiles(new FilenameFilter() {@Overridepublic boolean accept(File dir, String name) {//返回txt文件return  name.endsWith(".txt");}});for(File ff:files){System.out.println(ff.getName()+"..."+ff.length());}}//列表当前目录下的所有文件包含文件夹名字public static void method2(){File f=new File("c:\\");String [] names=f.list();//必须是目录，否则就是空指针异常for(String s:names){System.out.println(s);}}//列出当前系统的所有盘符public static void method1(){File [] files=File.listRoots();for(File f:files){System.out.println(f);}}}

package com.pb.day20.io.file;
/*** 递归调用，* 列表指定目录下的，所有文件包括子目录中的文件*/
import java.io.File;public class FileDemo4 {public static void main(String[] args) {File dir=new File("d:\\");getFiles(dir);}//递归public static void getFiles(File dir){System.out.println(dir);//获取文件数组，列表File[] files=dir.listFiles();//遍历for(File file:files){//判断是不是文件夹if(file.isDirectory()){//是文件夹就再次调用
            getFiles(file);}else{//不是就列表
            System.out.println(file);}}}}

package com.pb.day20.io.file;import java.io.File;public class FileDemo5 {public static void main(String[] args) {File dir=new File("d:\\kk");removeDir(dir);}//删除，带有文件的多层文件夹public static void removeDir(File dir){File [] files =dir.listFiles();for(int x=0;x<files.length;x++){if(files[x].isDirectory()){removeDir(files[x]);}else{//删除文件System.out.println(files[x]+"----file----"+files[x].delete());}}//删除空文件夹System.out.println(dir+"----dir----"+dir.delete());}}

/*
将一个文件夹的的所有文件，包含子目录都复制要另一个目录下
*/
import java.io.*;
class IOCopy
{public static void main(String[] args) {//源文件File src=new File("D:\\music");//目的文件File des=new File("e:\\test");copyDir(src,des);System.out.println("复制完成!");}/*递归复制*/public static void copyDir(File src,File des){    //获取列表File[] files=src.listFiles();//判断目标文件是否存在if(!des.exists()){//创建目录
            des.mkdir();}//遍历for(File f:files){    //判断是不是目录if(f.isDirectory()){//获取路径，拼接文件名，再次调用自己copyDir(new File(f.getPath()),new File(des+"\\"+f.getName()));//是不是文件}else if (f.isFile()){//复制copyFile(new File(f.getPath()),new File(des+"\\"+f.getName()));}}}//使用IO流复制文件public static void copyFile(File src,File des){BufferedInputStream bis=null;BufferedOutputStream bos=null;try{bis=new BufferedInputStream(new FileInputStream(src));bos=new BufferedOutputStream(new FileOutputStream(des));//声明缓冲区int len=0;while((len=bis.read())!=-1){bos.write(len);}}catch (IOException e){e.printStackTrace();  }finally{try{if(bos!=null)bos.close();}catch (IOException e){e.printStackTrace();  }try{if(bis!=null)bis.close();}catch (IOException e){e.printStackTrace();  }}}
}

public static void setAndGet(){//声明Properties prop=new Properties();//设置prop.setProperty("username", "root");prop.setProperty("password","root");//获取用户名对应的值System.out.println(prop.getProperty("username"));//修改密码prop.setProperty("password","root123");//获取全部keySet<String> keys=prop.stringPropertyNames();//遍历for(String s:keys){System.out.println(s+": "+prop.getProperty(s));}}

    public static void method2() throws IOException {// 声明Properties集合Properties prop = new Properties();FileInputStream fis = new FileInputStream("D:/info.txt");FileOutputStream fos = new FileOutputStream("D:\\info.txt");//加载数组到集合
        prop.load(fis);System.out.println(prop);prop.list(System.out);//修改prop.setProperty("sex", "woman");prop.store(fos, "sex is woman");System.out.println(prop);fos.close();fis.close();}public static void method1() throws IOException {// 文件流BufferedReader br = new BufferedReader(new FileReader("D:\\info.txt"));// 声明Properties集合Properties prop = new Properties();String line = null;// 遍历while ((line = br.readLine()) != null) {// System.out.println(line);String[] arr = line.split("=");// System.out.println(arr[0]+"..."+arr[1]);prop.setProperty(arr[0], arr[1]);}System.out.println(prop);br.close();}

public static void method() throws IOException{File file=new File("a.txt");//判断文件是否存在if(!file.exists()){file.createNewFile();}FileInputStream fis=new FileInputStream(file);//声明集合Properties prop=new Properties();prop.load(fis);int count=0;String value=prop.getProperty("times");if(value!=null){count=Integer.parseInt(value);//判断次数if(count>=5){System.out.println("使用次数已经用完，请续费!");return;}}//次数+1count++;//把KEY和VALUE放回去prop.setProperty("times", count+"");FileOutputStream fos=new FileOutputStream(file);prop.store(fos, "次数+1");fos.close();fis.close();}

package com.pb.io.properties.demo1;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;/*** 从键盘接收数据，并输出在控制台* 使用PrintWriter**/
public class PrintWriterDemo {public static void main(String[] args) throws IOException {//从键盘接收数据，并输出在控制台BufferedReader br=new BufferedReader(new InputStreamReader(System.in));//使用打印流输出，并自动刷新PrintWriter pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)),true);String line=null;System.out.println("请输入内容，以over结束!");while((line=br.readLine())!=null){if("over".equals(line)){break;}pw.println(line);}pw.close();br.close();}}

package com.pb.io.properties.demo1;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 SequenceDemo {public static void main(String[] args) throws IOException {Vector<FileInputStream> v=new Vector<FileInputStream>();v.add(new FileInputStream("d:\\1.txt"));v.add(new FileInputStream("d:\\2.txt"));v.add(new FileInputStream("d:\\3.txt"));//转换为枚举Enumeration<FileInputStream> en=v.elements();//合并流SequenceInputStream sis=new SequenceInputStream(en);//目标文件FileOutputStream fos=new FileOutputStream("d:\\4.txt");//声明缓冲区byte[] buf=new byte[1024];int len=0;while((len=sis.read(buf))!=-1){fos.write(buf,0,len);}fos.close();sis.close();}}

package com.pb.io.properties.demo1;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.Iterator;/*** 将文件切割* 再合并**/
public class SplitDemo {public static void main(String[] args) throws IOException {//split();
        merge();}//合并public static void merge() throws IOException{File src=new File("D:\\split");File [] files=src.listFiles();ArrayList<FileInputStream> list=new ArrayList<FileInputStream>();for(File f:files){list.add(new FileInputStream(f));}Iterator<FileInputStream> it=list.iterator();//创建枚举Enumeration<FileInputStream> en=new Enumeration<FileInputStream>() {@Overridepublic FileInputStream nextElement() {return it.next();}@Overridepublic boolean hasMoreElements() {return it.hasNext();}};//创建合并流SequenceInputStream sis=new SequenceInputStream(en);FileOutputStream fos=new FileOutputStream("D:\\split\\t.mp3");byte[] buf=new byte[1024];int len=0;while((len=sis.read(buf))!=-1){fos.write(buf,0,len);}fos.close();sis.close();}//切割public static void split() throws IOException{//源文件File file=new File("D:\\gm.mp3");FileInputStream fis=new FileInputStream(file);//目标FileOutputStream fos=null;//缓冲区byte[] buf=new byte[1024*1024];int len=0;int count=1;while((len=fis.read(buf))!=-1){fos=new FileOutputStream("D:\\split\\"+(count++)+".part");fos.write(buf,0,len);}fos.close();fis.close();}}