想用java找到两个文本文件之间的内容差异

问题描述

我有两个文本文件，

• a.txt


• b.txt

每个文本文件都包含一些文件路径。 b.txt 包含比 a.txt 更多的文件路径。我想确定添加哪些路径以及从 a.txt 中删除​​哪些路径，以便它对应于 b.txt 。

Each text files contains some file paths. b.txt contains some more file paths than a.txt. I would like to determine which paths are added and which are removed from a.txt so that it corresponds to paths in b.txt.

例如，

abc.txt包含

E:\Users\Documents\hello\a.properties
E:\Users\Documents\hello\b.properties
E:\Users\Documents\hello\c.properties

和xyz.txt包含

E:\Users\Documents\hello\a.properties
E:\Users\Documents\hello\c.properties
E:\Users\Documents\hello\g.properties
E:\Users\Documents\hello\h.properties

现在如何找到添加的g.prop和h.prop和b .prop被删除了？

Now how to find that g.prop and h.prop are added and b.prop is removed?

有人可以解释一下它是如何完成的吗？我只能找到如何检查相同的内容。

Could anyone explain how it is done? I could only find how to check for identical contents.

推荐答案

以下代码将满足您的目的，无论文件的内容如何。

The below code will serve your purpose irrespective of the content of the file.

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

    public class Test {
        public Test(){
            System.out.println("Test.Test()");
        }

        public static void main(String[] args) throws Exception {
            BufferedReader br1 = null;
            BufferedReader br2 = null;
            String sCurrentLine;
            List<String> list1 = new ArrayList<String>();
            List<String> list2 = new ArrayList<String>();
            br1 = new BufferedReader(new FileReader("test.txt"));
            br2 = new BufferedReader(new FileReader("test2.txt"));
            while ((sCurrentLine = br1.readLine()) != null) {
                list1.add(sCurrentLine);
            }
            while ((sCurrentLine = br2.readLine()) != null) {
                list2.add(sCurrentLine);
            }
            List<String> tmpList = new ArrayList<String>(list1);
            tmpList.removeAll(list2);
            System.out.println("content from test.txt which is not there in test2.txt");
            for(int i=0;i<tmpList.size();i++){
                System.out.println(tmpList.get(i)); //content from test.txt which is not there in test2.txt
            }

            System.out.println("content from test2.txt which is not there in test.txt");

            tmpList = list2;
            tmpList.removeAll(list1);
            for(int i=0;i<tmpList.size();i++){
                System.out.println(tmpList.get(i)); //content from test2.txt which is not there in test.txt
            }
        }
    }

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