• java小程序,用java在指定目录或以及子目录中找出同名文件,java File过滤文件名后找同名文件


    主要是使用java API“java.io.File”实现

    一个简单的类,copy出来,因main方法可直接运行。

      1 package com.paic.icore.pams.auto.util;
      2 
      3 import java.io.File;
      4 import java.util.ArrayList;
      5 import java.util.HashMap;
      6 import java.util.Iterator;
      7 import java.util.List;
      8 import java.util.Map;
      9 import java.util.Map.Entry;
     10 
     11 /**
     12  * @author White lion
     13  *
     14  */
     15 public class FindSameFile {
     16     static int filterFilesCount=0,filterFileNamesCount=0;
     17     static List<String> filterFiles = new ArrayList<String>(),filterFileNames = new ArrayList<String>();
     18     static Map<String, Object> sameFileNames = new HashMap<String, Object>(),fileNames = new HashMap<String, Object>();
     19     static File root,aRoot,bRoot;
     20     
     21     //execue init data
     22     static{
     23         filterFileNames.add("svn-");
     24         filterFileNames.add("index.html");
     25         
     26         filterFiles.add(".svn");
     27         filterFiles.add("image");
     28         filterFiles.add("htmlDemo");
     29         
     30         //目录A
     31         aRoot = new File("E:/Software/src/webroot");
     32         //目录B
     33         bRoot = new File("D:/Software/webroot");
     34         
     35         root = new File("E:/Software/src/webroot");
     36     }
     37     
     38     //execue
     39     public static void main(String[] args) {
     40         long start =System.currentTimeMillis();
     41 //        findFile(root, fileNames, null, null);
     42         findSameFileName(aRoot,bRoot);
     43         System.out.println("耗时:"+(System.currentTimeMillis()-start)+"ms,sameFileNames count:" + sameFileNames.size()+",fileNames count:" + fileNames.size()+",filterFilesCount:" + filterFilesCount+",filterFileNamesCount:" + filterFileNamesCount);
     44     }
     45 
     46     public static void findSameFileName(File aRoot, File bRoot) {
     47         long start =System.currentTimeMillis();
     48         Map<String, Object> aFileNames = new HashMap<String, Object>();
     49         findFile(aRoot,aFileNames,filterFiles,filterFileNames);
     50         
     51         Map<String, Object> bFileNames = new HashMap<String, Object>();
     52         findFile(bRoot,bFileNames,filterFiles,filterFileNames);
     53         
     54         System.out.println(aRoot+" list:
    "+aFileNames.keySet());
     55         System.out.println(bRoot+" list:
    "+bFileNames.keySet());
     56         
     57         Iterator<Entry<String, Object>> iterator;
     58         Map<String, Object> stayFindFileNames = new HashMap<String, Object>();
     59         if(aFileNames.size() >= bFileNames.size()){
     60             iterator=aFileNames.entrySet().iterator();
     61             stayFindFileNames=bFileNames;
     62         }else{
     63             iterator=bFileNames.entrySet().iterator();
     64             stayFindFileNames=aFileNames;
     65         }
     66                 
     67         while (iterator.hasNext()) {
     68             Entry<String, Object> next = iterator.next();
     69             String key = next.getKey();
     70             Object value = next.getValue();
     71             
     72             if(null!=stayFindFileNames.get(key)){
     73                 Object stayObj = stayFindFileNames.get(key);
     74 
     75                 if(value instanceof java.io.File){
     76                     File a = (File) value;
     77                     addFileToSameFileNamesBox(stayObj, a);
     78                 }else if(value instanceof List){
     79                     List<File> list = (List<File>) value;
     80                     for (File f : list) {
     81                         addFileToSameFileNamesBox(stayObj, f);
     82                     }
     83                     
     84                 }
     85                 
     86             }
     87             
     88         }
     89         System.out.println("findSameFileName 耗时:"+(System.currentTimeMillis()-start)+"ms,sameFileNames count:" + sameFileNames.size()+",sameFileNames list:
    " + sameFileNames.keySet());
     90     }
     91 
     92     
     93     public static void findFile(File root, Map<String, Object> fileNames,List<String> filterFiles,List<String> filterFileNames) {
     94         if (root.exists() && root.isDirectory()) {
     95             for (File file : root.listFiles()) {
     96                 if (file.isFile()) {
     97                     if(null!=filterFileNames){
     98                         int tmpFilterFileNamesCount=filterFileNamesCount;
     99                         for (String filter : filterFileNames) {
    100                             if(file.getName().indexOf(filter)>-1){
    101                                 filterFileNamesCount++;
    102                                 System.out.println("filter fileName1:"+file.getPath());//这里输出文件名!
    103                                 break;
    104                             }
    105                         }
    106                         if(tmpFilterFileNamesCount<filterFileNamesCount) continue;
    107                     }
    108                     if(null!=fileNames.get(file.getName())){
    109                         Object value = fileNames.get(file.getName());
    110                         if(value instanceof java.io.File){
    111                             File b = (File) value;
    112                             List<File> list = new ArrayList<File>(); 
    113                             fileNames.put(b.getName(), list);
    114                             list.add(b);
    115                             list.add(file);
    116                         }else if(value instanceof List){
    117                             List<File> b = (List<File>) value;
    118                             b.add(file);
    119                         }
    120                     }else{
    121                         fileNames.put(file.getName(), file);
    122                     }
    123 //                    System.out.println("find:"+file.getPath());//这里输出文件名!
    124                 } else if (file.isDirectory()) {
    125                     if(null!=filterFiles){
    126                         if(filterFiles.contains(file.getName())){
    127                             filterFilesCount++;
    128                             System.out.println("filter file2:"+file.getPath());//这里输出文件名!
    129                             continue;
    130                         }
    131                     }
    132                     findFile(file, fileNames, filterFiles, filterFileNames);
    133                 }
    134                 
    135             }
    136         }
    137         
    138     }
    139     
    140     public static void addFileToSameFileNamesBox(File file) {
    141         if(null!=sameFileNames.get(file.getName())){
    142             Object value = sameFileNames.get(file.getName());
    143             if(value instanceof java.io.File){
    144                 File b = (File) value;
    145                 List<File> list = new ArrayList<File>(); 
    146                 sameFileNames.put(b.getName(), list);
    147                 list.add(b);
    148                 list.add(file);
    149             }else if(value instanceof List){
    150                 List<File> b = (List<File>) value;
    151                 b.add(file);
    152             }
    153         }else{
    154             sameFileNames.put(file.getName(), file);
    155         }
    156     }
    157     
    158     public static void addFileToSameFileNamesBox(Object stayObj, File file) {
    159         if(stayObj instanceof java.io.File){
    160             File stayFile = (File) stayObj;
    161             if(stayFile.getName().equals(file.getName())){
    162                 addFileToSameFileNamesBox(stayFile);
    163             }
    164         }else if(stayObj instanceof List){
    165             List<File> list = (List<File>) stayObj;
    166             for (File f : list) {
    167                 if(f.getName().equals(file.getName())){
    168                     addFileToSameFileNamesBox(f);
    169                 }
    170             }
    171         }
    172     }
    173     
    174 }
    View Code
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  • 原文地址:https://www.cnblogs.com/svennee/p/4708257.html
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