File-操作

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//打印所以文件和目录
public static void printFile(File file) {
    for (File f : file.listFiles()) {
        if (f.isDirectory()) {
            System.out.println(f.getPath());
            printFile(f);
        } else {
            System.out.println(f.getPath());
        }
    }
}

//删除目录下全部文件
public static void delAllFile(File file) {
    for (File f : file.listFiles()) {
        if (f.isFile()) {
            f.delete();
        } else if (f.isDirectory()) {
            delAllFile(f);
            f.delete();
        }
    }
}

FileOutputStream

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FileOutputStream fos=new FileOutputStream("src\\22.txt",true); //true追加写入

byte[] b="文本写入操作".getBytes();
fos.write(b);

fos.write("\n".getBytes());
fos.close();

FileInputStream

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FileInputStream fis=new FileInputStream("src\\11.txt");

int b= fis.read();
System.out.println((char) b);

//读取
int by;
while ((by=fis.read())!=-1){
System.out.print((char) by);
}

复制

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FileInputStream fis=new FileInputStream("src\\11.txt");
FileOutputStream fos=new FileOutputStream("src\\66.txt");
int by;
while ((by=fis.read())!=-1){
    fos.write(by);
}