复制代码代码如下:
importar java.io.File;
importar java.io.FileInputStream;
importar java.io.FileOutputStream;
importar java.io.IOException;
importar java.io.RandomAccessFile;
classe pública InsertContent {
public static void insert(String fileName, posição longa, String insertContent) lança IOException{
Arquivo arquivo = File.createTempFile("tmp", null);
arquivo.deleteOnExit();
RandomAccessFile raf = new RandomAccessFile(nomeArquivo, "rw");
FileInputStream fileInputStream = novo FileInputStream(arquivo);
FileOutputStream fileOutputStream = novo FileOutputStream(arquivo);
raf.seek(pos);
byte[] buff = novo byte[64];
int hasRead = 0;
while((hasRead = raf.read(buff)) > 0){
arquivoOutputStream.write(buff);
}
raf.seek(pos);
raf.write(insertContent.getBytes());
//追加文件插入点之后的内容
while((hasRead = fileInputStream.read(buff)) > 0){
raf.write(buff, 0, hasRead);
}
raf.close();
fileInputStream.close();
arquivoOutputStream.close();
}
public static void main(String[] args) lança IOException {
insert("F:/AttendanceActivity.java", 57, "插入的内容rn");
}
}