Question

我试图逐行比较2个文件。在进行这种比较之后，所有行都被复制到第三个文件，它们被标识为＆＃34;出现在两个文件中＃34 ;; ＆＃34;不包括fileA＆＃34 ;;或＆＃34;不包括fileB＆＃34;。感谢@nono和@Andreas的帮助，我的代码正在运行，但输出文件上还没有写入任何内容。

       public static void compareFileLines(String fileLocA, String fileLocB, String fileLocC) throws IOException{
        //fileLoc'X' is the filepath 
        try{
        BufferedReader reader1 = new BufferedReader( new FileReader(fileLocA));
        BufferedReader reader2 = new BufferedReader( new FileReader(fileLocB));
        PrintWriter writer = new PrintWriter(new File(fileLocC));

        String []linesA = new String [fileLenght(fileLocA)];  //filelenght checks number of lines on a file
        String []linesB = new String [fileLenght(fileLocB)];

        for (int i=0; i< linesA.length-1; i++){
        linesA[i]=  reader1.readLine();
        }
        for (int i=0; i< linesB.length-1; i++){
             linesB[i]=  reader2.readLine();
        }
        boolean finder = false;         
        for (int n =0; n<linesA.length-1; n++){
            for(int m=0; m<linesB.length-1; m++){
                if (linesA[n].equals(linesB[m])){
                    finder = true;
                    writer.append(linesA[n]+" Is in both files \n");
                }
                if (finder == false){
                    writer.append(linesA[n]+ "Is exclusive of File1");                      
            }
                finder = false;
        }
        }
        finder = false;
        for (int n=0; n< linesB.length -1; n++){
            for (int m=0; m< linesA.length -1; m++){
                if (linesB[n].equals(linesA[m])){
                    finder = true;
                }

            }
            if (finder == false){
                writer.append(linesB[n] +" is exclusive of File2");
            }
            finder = false;
        }


    }finally{           

    }       

}

Answer 1

BufferedReader构造函数可以接受FilReader。 FileReader可以接受文件或路径。

FileReader fr = new FileReader（＆＃34; text.txt＆＃34;）;

BufferedReader br = new BufferedReader（fr）;

循环使用：字符串s; while（（s = br.readLine（））！= null）{ ... }

比较Java中2个文件中的行

1 个答案: