10.RandomAccessFile
发表日期:2022-08-05 16:09:05 | 来源: | | 浏览(626) 分类:JAVA基础
RandomAccessFile
package File; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.RandomAccessFile; public class RandomAccessFileDemo { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub File file = new File("D:" + File.separator + "RandomAccessFile.txt"); //两种写法均可 //RandomAccessFile rFile = new RandomAccessFile("D:"+File.separator+"test.txt", "rw"); RandomAccessFile rFile = new RandomAccessFile(file, "rw"); String string = "abcdefg我去这是什么情况?"; ; rFile.write(string.getBytes());//写入中文会乱码 rFile.close(); write(); read(); } private static void read() { // TODO Auto-generated method stub File file = new File("d:" + File.separator + "123.txt"); RandomAccessFile rFile = null; try { rFile = new RandomAccessFile(file, "r"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { byte c[] = new byte[(int) rFile.length()]; rFile.read(c); System.out.println(new String(c)); } catch (IOException e) { e.printStackTrace(); } } public static void write() { File file = new File("d:" + File.separator + "123.txt"); RandomAccessFile rFile = null; try { rFile = new RandomAccessFile(file, "rw"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } String name = "zhangsan"; int age = 30; try { rFile.writeInt(age); // rFile.writeBytes(name); rFile.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
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