如何在Java中刪除檔案中(.txt)的字串?
replaceAll() 方法接受一個正則表示式和一個字串作為引數,並將當前字串的內容與給定的正則表示式相匹配,如果匹配,則用字串替換匹配的元素。
使用 replaceAll() 方法從檔案中刪除特定字串 -
以字串形式檢索檔案的內容。
使用 replaceAll() 方法將所需的單詞替換為空字串。
將結果字串重新寫回檔案。
示例
import java.io.File; import java.io.FileNotFoundException; import java.io.PrintWriter; import java.util.Scanner; public class StringExample { public static String fileToString(String filePath) throws Exception{ String input = null; Scanner sc = new Scanner(new File(filePath)); StringBuffer sb = new StringBuffer(); while (sc.hasNextLine()) { input = sc.nextLine(); sb.append(input); } return sb.toString(); } public static void main(String args[]) throws FileNotFoundException { String filePath = "D://sample.txt"; String result = fileToString(filePath); System.out.println("Contents of the file: "+result); //Replacing the word with desired one result = result.replaceAll("\bTutorialspoint\b", ""); //Rewriting the contents of the file PrintWriter writer = new PrintWriter(new File(filePath)); writer.append(result); writer.flush(); System.out.println("Contents of the file after replacing the desired word:"); System.out.println(fileToString(filePath)); } }
輸出
Contents of the file: Hello how are you welcome to Tutorialspoint Contents of the file after replacing the desired word: Hello how are you welcome to
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