Question

我有一个文本文件，其格式如下：

ab
cd
ef
gh
ij
..

我想在“ef”之后删除字符串，我的意思是在运行我的程序后，文本文件结构如下：

ab
cd 
ef

我正在使用netbeans IDE并使用java代码。有人可以帮忙吗？这是我尝试过的代码，但它只是在字符串中将字符串保留在“ef”之前，但我不知道如何做其他代码！

BufferedReader br = new BufferedReader(new FileReader("E:\\info.txt"));
try {
    StringBuilder sb = new StringBuilder();
    String line = br.readLine();

    while (!(line.equals("ef"))) {
        sb.append(line);
       // sb.append(System.lineSeparator());
        line = br.readLine();
    }
    String everything = sb.toString();
    System.out.print(everything);
   // System.out.print(sb);
} finally {
    br.close();
}

Answer 1

以下是更正文件的示例

final String fileName = "E:\\info.txt";
String everything = "";

try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
  StringBuilder sb = new StringBuilder();
  String line = br.readLine();

  while (!(line.equals("ef"))) {
    sb.append(line).append("\n");
    // sb.append(System.lineSeparator());
    line = br.readLine();
  }

  sb.append(line);
  everything = sb.toString();
  System.out.print(everything);
}

final File file = new File(fileName);
file.delete();

try (FileWriter writer = new FileWriter(fileName)) {
  writer.write(everything);
}

Answer 2

您可以像以下示例中一样使用Apache commons-io FileUtils：

private final String FILE_NAME = "E:\\info.txt";

public void test() throws IOException {
    File file = new File(FILE_NAME);
    List<String> strings = FileUtils.readLines(file);
    int ef = strings.indexOf("ef");
    List<String> stringBeforeEF = strings.subList(0, ef);
    FileUtils.writeLines(file, stringBeforeEF);
}

如何在文本文件中保留一些字符串？

2 个答案: