java - 如果在字符串集中找到字符串标记，则替换该字符串标记

Question

下面的代码应该读取文件 MainFile.txt 中的每一行，检查每一行是否包含 Set 中的 token 。如果包含，请将其替换为“xxx”字符串。然后使用 BufferedWriter 写入一个新文件。 输出ConvFile.txt与输入完全相同。

主文件.txt:

car, 18, train, 19, bus,
laptop, 20, tablet, 21, computer,
swim, 22, bike, 23, run,



public class ReplaceWords {

Set<String> wordToReplace;

public ReplaceWords(){
    this.wordToReplace = new HashSet<>();
    this.wordToReplace.add("18");
    this.wordToReplace.add("19");
    this.wordToReplace.add("20");
    this.wordToReplace.add("21");
    this.wordToReplace.add("22");
    this.wordToReplace.add("23");
}

public void redactFile(){
    String inPathname = "E:\\SkyDrive\\Java\\Coding\\FileChgOne\\MainFile.txt";
    String outPathname = "E:\\SkyDrive\\Java\\Coding\\FileChgOne\\ConvFile.txt";
    File inFile = new File(inPathname);
    File outFile = new File(outPathname);

    Scanner bufferedScanner = null;
    BufferedWriter bufferedFileWriter = null;



    try {
        Scanner lineScanner;
        String currentLine;

        bufferedScanner = new Scanner(new BufferedReader(new FileReader(inFile)));
        bufferedFileWriter = new BufferedWriter(new FileWriter(outFile));

        while(bufferedScanner.hasNextLine()){
            currentLine = bufferedScanner.nextLine();
            lineScanner = new Scanner(currentLine);
            lineScanner.useDelimiter(",");

            while(lineScanner.hasNext()){
                String currentToken = lineScanner.next();
                if (this.wordToReplace.contains(currentToken)){
                    bufferedFileWriter.write("xxx, ");
                }
                else {
                    bufferedFileWriter.write(currentToken + ", ");
                }

            } 
            bufferedFileWriter.newLine();
        }

    }
    catch (Exception en){
        System.out.println("error: " + en);
    }

    finally {
        try {
            bufferedScanner.close();
            bufferedFileWriter.close();
        }
        catch (Exception en) {
            System.out.println(en);
        }
    } 
} 
}

输出ConvFile.txt:

car,  18,  train,  19,  bus, 
laptop,  20,  tablet,  21,  computer, 
swim,  22,  bike,  23,  run, 

Answer 1

需要对标记进行修剪，即当扫描仪读取标记时应删除逗号后面的空格:

while(lineScanner.hasNext()){
    String currentToken = lineScanner.next();
    currentToken = currentToken.trim();  // line to add
    if (this.wordToReplace.contains(currentToken)){
        bufferedFileWriter.write("xxx, ");
    }
    else {
        bufferedFileWriter.write(currentToken + ", ");
    }

}

您还可以按照 Marko Topolnik 在评论中的建议，通过更新 Scanner 的分隔符模式来实现此目的。

lineScanner = new Scanner(currentLine);
lineScanner.useDelimiter("\\s*,\\s*");

\\s* 表示零个或多个空白字符。