前言
RandomAccessFile是属于随机读取类，是可以对文件本身的内容直接随机进行操作的，可以在文件的指定位置
的读取和写入内容，这在很多时候都是很方便的。
1. 写入文件
public void write(View view) {
String fileName = getFilesDir() + "/test.txt";
String insertContent = "1234567890123456789012345678901234567890123456789012345678901234567890" +
"123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890" +
"123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890" +
"123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
try {
File file = new File(fileName);
RandomAccessFile raf = new RandomAccessFile(file, "rw");
raf.write(insertContent.getBytes());
raf.close();
System.out.println("File length: " + new File(fileName).length());
} catch (Exception e) {
}
}
3. 读取文件
public void read(View view) {
String fileName = getFilesDir() + "/test.txt";
try {
RandomAccessFile raf = new RandomAccessFile(fileName, "r");
// 需要读取的文件的大小
System.out.println("raf.length(): " + raf.length());
// 从第11字节开始读取
int start = 10;
raf.seek(start);
// 跳过2个字节读取
raf.skipBytes(2);
// 每次读取的字节数
byte[] bytes = new byte[1024];
int byteRead ;
while ((byteRead = raf.read(bytes)) != -1) {
System.out.println(new String(bytes, 0, byteRead));
}
raf.close();
} catch (Exception e) {
e.printStackTrace();
}
}
效果图：
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