Question

如何删除Java中的文件内容？

Answer 1

这个怎么样：

new RandomAccessFile(fileName).setLength(0);

Answer 2

new FileOutputStream(file, false).close();

Answer 3

您可以通过打开文件for writing and then truncating its content来执行此操作，以下示例使用NIO：

import static java.nio.file.StandardOpenOption.*;

Path file = ...;

OutputStream out = null;
try {
    out = new BufferedOutputStream(file.newOutputStream(TRUNCATE_EXISTING));
} catch (IOException x) {
    System.err.println(x);
} finally {
    if (out != null) {
        out.flush();
        out.close();
    }
}

Another way：截断文件的最后20个字节：

import java.io.RandomAccessFile;


RandomAccessFile file  = null; 
try { 
    file = new RandomAccessFile ("filename.ext","rw");
    // truncate 20 last bytes of filename.ext 
    file.setLength(file.length()-20); 
} catch (IOException x) { 
    System.err.println(x); 
} finally { 
    if (file != null) file.close(); 
}

Answer 4

可能问题是这只留下我认为的头而不是尾巴？

public static void truncateLogFile(String logFile) {
    FileChannel outChan = null;
    try {
        outChan = new FileOutputStream(logFile, true).getChannel();
    }
    catch (FileNotFoundException e) {
        e.printStackTrace();
        System.out.println("Warning Logfile Not Found: " + logFile);
    }

    try {
        outChan.truncate(50);
        outChan.close();
    }
    catch (IOException e) {
        e.printStackTrace();
        System.out.println("Warning Logfile IO Exception: " + logFile);
    }
}

Answer 5

打开文件进行写入，然后保存。它删除了文件的内容。

Answer 6

try {
        PrintWriter writer = new PrintWriter(file);
        writer.print("");
        writer.flush();
        writer.close();

    }catch (Exception e)
    {

    }

此代码将删除'file'的当前内容，并将文件长度设置为0。

如何只删除Java中文件的内容？

6 个答案: