Java实现对文件的操作

1. package com.File_writer;
2. 
3. import java.io.FileNotFoundException;
4. import java.io.FileReader;
5. import java.io.FileWriter;
6. import java.io.IOException;
7. 
8. public class File_readerCopy {
9. public static void main(String[] args) throws IOException {
10. //        创建读与写对象
11.         FileReader in=null;
12. FileWriter out =null;
13. try {
14.             in =new FileReader("E:\\File_readerCopy.java");
15.             out=new FileWriter("D:\\测试.java");
16. char[] chars = new char[1024 * 512];
17. int readCount=0;
18. while ((readCount=in.read(chars))!=-1){
19.                 out.write(chars,0,readCount);
20.             }
21.         } catch (FileNotFoundException e) {
22. throw new RuntimeException(e);
23.         } catch (IOException e) {
24. throw new RuntimeException(e);
25.         }finally {
26. if (out != null) {
27.                 out.close();
28.             }
29. if (in != null) {
30.                 in.close();
31.             }
32.         }
33.     }
34. }