java文件夹相关操作 演示样例代码

java文件夹相关操作 演示样例代码

package org.rui.io;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;

/**
 * 文件夹列表器 測试
 * 
 * @author lenovo
 *
 */
//Args:"C:/Users/lenovo/Pictures/screen/*\.jpg"
public class DirList {
	public static void main(String[] args) {
		String[] argss=new String[1];
		
		String s=DirectoryDemo.class.getPackage().getName().replace(".","/");
		String dirPath=new File("").getAbsolutePath()+"\\src\\"+s;
		//path=".";
		argss[0]="D.*\\.java";
		File path=new File(dirPath);
		String[] list = null;
		if(argss.length==0)
		{
			list=path.list();
		}else
		{
			System.out.println("all file list==>"+Arrays.toString(path.list()));
		    //显示文件夹以下的文件并用正则匹配
			list=path.list(new DirFilter(argss[0]));
		
		}
		//排序打印
		Arrays.sort(list,String.CASE_INSENSITIVE_ORDER);
		for(String dirItem:list)
		System.out.println(dirItem);
	}

}

/**
 * output:
all file list==>[D.txt, Directory.java, DirectoryDemo.java, DirList.java, fout, inout, Main.java, PPrint.java, zzz.class]
Directory.java
DirectoryDemo.java
DirList.java
 *
 */

/**
 * 这是一个策略模式的样例
 * @author lenovo
 *
 */
class DirFilter implements FilenameFilter
{
	private Pattern pattern;
    public DirFilter(String regex)
    {
    	this.pattern=Pattern.compile(regex);
    }
	
	public boolean accept(File dir, String name) {
		return pattern.matcher(name).matches();
		
	}
	
}

package org.rui.io;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
/**
 * 文件夹有用工具
 * @author lenovo
 *
 */
public class Directory {
	public static File[] local(File dir,final String regex)
	{
		return dir.listFiles(new FilenameFilter()
		{
			private Pattern pa=Pattern.compile(regex);
			public boolean accept(File dir, String name) 
			{
				return pa.matcher(name).matches();
			}
		});
	}
	//overloaded重载
	public static File[] local(String path,final String regex)
	{
		return local(new File(path),regex);
	}
	
	public static class TreeInfo implements Iterable<File>
	{
		public List<File> files=new ArrayList<File>();
		public List<File> dirs=new ArrayList<File>();
		
		public Iterator<File> iterator() {
			return files.iterator();
		}
		
		void addAll(TreeInfo other)
		{
			files.addAll(other.files);
			dirs.addAll(other.dirs);
		}
		
		public String toString()
		{
			return "dirs: "+PPrint.pformat(dirs)+
					"\n\nfiles:"+PPrint.pformat(files);
		}
		
		public static TreeInfo walk(String start,String regex)
		{
			return recurseDirs(new File(start),regex);
		}
		
		public static TreeInfo walk(File f,String regex)
		{
			return recurseDirs(f,regex);
		}
		
		public static TreeInfo walk(File f)
		{
			return recurseDirs(f,".*");
		}
		
		public static TreeInfo walk(String start)
		{
			return recurseDirs(new File(start),".*");
		}
		
		//递归
		static TreeInfo recurseDirs(File f,String reg)
		{
			TreeInfo result=new TreeInfo();
			for(File item :f.listFiles())
			{
				if(item.isDirectory())
				{
					result.dirs.add(item);//加入文件夹集合
					result.addAll(recurseDirs(item,reg));//递归回方法 循环子文件夹
				}else
				{
					if(item.getName().matches(reg))
					{
						result.files.add(item);//加入文件
					}
				}
			}
			return result;
		}
		
		//////////////////////////mian
		public static void main(String[] args) {
			String[] argss=new String[1];
			//C:\\Users\\lenovo\\Pictures\\screen
			argss[0]=".";
			if(argss.length==0)
				System.out.println(walk("."));
			else
				for(String arg:argss){
					System.out.println(walk(arg));
				}
		}
		
	}

}
/**output:
 * 
 //result.addAll(recurseDirs(item,reg));//以下是不递归的输出，文件太多 不好理解
  
dirs: [.\.settings, .\bin, .\src]

files:[.\.classpath, .\.project]
---------------------------------------------------------------------
----------格式化后的输出--------------
---------------------------------------------------------------------
dirs: [
.\.settings
.\bin
.\src
]

files:[
.\.classpath
.\.project
]
*/

package org.rui.io;

import java.util.Arrays;
import java.util.Collection;
/**
 * 机灵打印机 以使输出更easy浏览
 * @author lenovo
 *
 */
public class PPrint {
	public static String pformat(Collection<?
> c)
	{
	  if(c.size()==0)return "[]";	
	  StringBuilder result=new StringBuilder("[");
	  for(Object elem:c)
	  {
		  if(c.size()!=1)
			  result.append("\n");
		  result.append(elem);
	  }
	  if(c.size()!=1)
		  result.append("\n");
	  result.append("]");
	  return result.toString();
	  
	}
	
	  
	  public static void pprint(Collection<?> c)
	  {
		  System.out.println(pformat(c));
	  }
	  
	  public static void pprint(Object[] c)
	  {
		  System.out.println(pformat(Arrays.asList(c)));
	  }
	  

}

package org.rui.io;

import java.io.File;
import java.util.regex.Pattern;

public class DirectoryDemo {
	
	public static void main(String[] args) 
	{
		
	String s=DirectoryDemo.class.getPackage().getName().replace(".","/");
	String path=new File("").getAbsolutePath()+"\\src\\"+s;
	//System.out.println(path);
	//path=".";
		PPrint.pprint(Directory.TreeInfo.walk(path).dirs);
		//all files beginning with "t"
		for(File f:Directory.local(path,"D.*"))
			System.out.println(f);
		System.out.println("----------------");
		for(File f:Directory.local(path, "D.*\\.java"))
		System.out.println(f);
		System.out.println("================");
		//class files containing "z" or "Z"
		for(File f:Directory.TreeInfo.walk(path,".*[Zz].*\\.class"))
		System.out.println(f);
	}
}
/**
[
D:\Users\liangrui\workspace\thinking\src\org\rui\io\fout
D:\Users\liangrui\workspace\thinking\src\org\rui\io\fout\f
D:\Users\liangrui\workspace\thinking\src\org\rui\io\inout
]
D:\Users\liangrui\workspace\thinking\src\org\rui\io\D.txt
D:\Users\liangrui\workspace\thinking\src\org\rui\io\Directory.java
D:\Users\liangrui\workspace\thinking\src\org\rui\io\DirectoryDemo.java
D:\Users\liangrui\workspace\thinking\src\org\rui\io\DirList.java
----------------
D:\Users\liangrui\workspace\thinking\src\org\rui\io\Directory.java
D:\Users\liangrui\workspace\thinking\src\org\rui\io\DirectoryDemo.java
D:\Users\liangrui\workspace\thinking\src\org\rui\io\DirList.java
================
D:\Users\liangrui\workspace\thinking\src\org\rui\io\zzz.class
*/

package org.rui.io;

import java.io.File;
import java.io.IOException;
import java.util.regex.Pattern;
/**
 * 更近一步创建一个文件夹工具，它能够在文件夹中穿行。
 * 这是策略设计模式的还有一个演示样例
 * Strategy 接口内嵌在processFile中，使得假设你希望实现它。就必须实现ProcessFiles.Strategy
 * 它为读者提供了很多其它的上下文信息。
 * 
 * 
 * 
 * @author lenovo
 *
 */
public class ProcessFiles {
	
	//策略
	public interface Strategy
	{
		void process(File file);
	}
	private Strategy strategy;
	private String ext;
	
	public ProcessFiles(Strategy strategy,String ext)
	{
		this.strategy=strategy;
		this.ext=ext;
	}
	
	public void start(String[] args)
	{
		try {
			if(args.length==0)
				processDirectoryTree(new File("."));
			else 
				for(String arg:args)
				{
					File fileArg=new File(arg);
					if(fileArg.isDirectory())//假设是文件夹
						processDirectoryTree(fileArg);
					else
						if(!arg.endsWith(ext))//假设后缀不同样，则加上
						arg+="."+ext;//文件后缀
					strategy.process(new File(arg).getCanonicalFile());//依教规的
					
				}
			
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	////////walk=步行
	private void processDirectoryTree(File root) throws IOException {
	    for(File file:Directory.TreeInfo.walk(
	    		root.getAbsoluteFile(),
	    		".*\\."+ext
	    		))
	    	strategy.process(file.getCanonicalFile());
		
	}
	
	//demonstration of how to use
	public static void main(String[] args) {
		
		new ProcessFiles(new ProcessFiles.Strategy() {
			public void process(File file) {
				System.out.println(file);
			}
		}, "java").start(args);;
	}
	
}
/**output:
D:\Users\liangrui\workspace\thinking\src\Concatenation.java
D:\Users\liangrui\workspace\thinking\src\org\rui\array\AssemblingMultidimensionalArrays.java
D:\Users\liangrui\workspace\thinking\src\org\rui\array\AutoboxingArrays.java
D:\Users\liangrui\workspace\thinking\src\org\rui\array\Bean.java
.......................
..............
 */

package org.rui.io;

import java.io.File;
/**
 * 文件夹检查及创建
 * @author lenovo
 *
 */
public class MakeDirectories {
	
	//提示信息
	private static void usage()
	{
		System.err.println(
				"Usage:MakeDirectories path1...\n"+
		        "Creates each path\n"+
		        "usage:makedirectories -d path1....\n"+
		        "deletes each path\n"+
		        "usage make directories -r path1 path2\n"+
		        "Renames from path1 to path2"
				);
		System.exit(0);
	}
	
	//输出文件信息
	private static void fileDate(File f)
	{
		System.out.println("absolute path:"+f.getAbsolutePath()
				+"\ncal read:"+f.canRead()
				+"\ncan Write:"+f.canWrite()
				+"\n name:"+f.getName()
				+"\nparent:"+f.getParent()
				+"\nlength:"+f.length()
				+"\npath:"+f.getPath()
				+"\nlastmodiffied:"+f.lastModified()
				);
	
		if(f.isFile())
			System.out.println("it is a file");
		else if(f.isDirectory())
			System.out.println("it s a directory");
		
	}
/////////////////////main test///////////////////////////////////////
	public static void main(String[] args) {
		String argss[]=new String[1];
		argss[0]="MakeDirectoriesTest";
		if(argss.length<1) usage();
		if(argss[0].equals("-r"))
		{
			if(argss.length!=3)
			{
				usage();
			}
			
			File old=new File(argss[1]),rname=new File(argss[2]);
			old.renameTo(rname);
			fileDate(old);
			fileDate(rname);
			return; //exit main
		}
		
		int count=0;
		boolean del=false;
		if(argss[0].equals("-d"))
		{
			count++;
			del=true;
		}
		count--;
		while(++count<argss.length)
		{
			File f=new File(argss[count]);
			
			if(f.exists())//假设存在
			{
				System.out.println(f+" exists");
				if(del)//删除文件文件夹
				{
					System.out.println("deleting..."+f);
					f.delete();
				}
			}else
			{//创建文件文件夹
				if(!del)
				{
					f.mkdirs();
					System.out.println("created:"+f);
				}
			}
			
			fileDate(f);
			
		}
	}
}
/**output:(80% match)
created:MakeDirectoriesTest
absolute path:D:\Users\liangrui\workspace\thinking\MakeDirectoriesTest
cal read:true
can Write:true
 name:MakeDirectoriesTest
parent:null
length:0
path:MakeDirectoriesTest
lastmodiffied:1403013856223
it s a directory
 */