文件比较工具_util文件比较-优快云博客

本文介绍了如何通过Java代码比较两个文件夹中的文件大小，并输出存在差异的文件名及大小。程序通过遍历文件夹，将文件名及其大小存储到TreeMap中，然后对比两组数据，找出只存在于其中一个文件夹但不存在于另一个文件夹的文件，以及大小不匹配的文件。

package com.test;

import java.io.File;
import java.util.Iterator;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

public class CompareFiles {

    /**
     * @param args
     */
    public static void main(String[] args) {
        SortedMap UATMap = new TreeMap();
        SortedMap packageMap = new TreeMap();
        File f = new File("C://Documents and Settings//th04008//Desktop//com-pakgPRD");
        addFile(f, UATMap);

        f = new File("C://Documents and Settings//th04008//Desktop//com-pakgUAT");
        addFile(f, packageMap);

        System.out.println("BAU size: " + UATMap.size());
        System.out.println("Package size: " + packageMap.size());


        Iterator iter1 = UATMap.keySet().iterator();
        while(iter1.hasNext()){
            String key = (String) iter1.next();
            if(!packageMap.containsKey(key)){
                System.out.println("key exists in packageUAT but not exist in packagePRD:" + key);
            }

        }

        Iterator iter2 = packageMap.keySet().iterator();
        while(iter2.hasNext()){
            String key = (String) iter2.next();
            if(!UATMap.containsKey(key)){
                System.out.println("key exists in packagePRD but not exist in packageUAT:" + key);
            }

        }



        Iterator iter = UATMap.keySet().iterator();
        int a = 0;
        while(iter.hasNext()){
            String key = (String) iter.next();
            String uatSize = (String) UATMap.get(key);
            String packageSize = (String) packageMap.get(key);
            if(!uatSize.equals(packageSize)){
                System.out.println(key + ": packageUAT Size: " + uatSize + "; packagePRD Size: " + packageSize );
            }
            a++;
        }
        System.out.println("iterate times: " + a);


    }

    private static void addFile(File f, Map UATMap){
        if(f.isFile()){
            long length = f.length();
            String fileName = f.toString().substring(53);
            UATMap.put(fileName, String.valueOf(length));
        } else if(f.isDirectory()){
            File[] files = f.listFiles();
            for(int i=0;i<files.length;i++){
                File tempFile = files[i];
                addFile(tempFile,UATMap);
            }
        }
    }

}