Java I/O操作

按字节读取读取文件，并且将文件里面的内容写到另外一个文件里面去

1. publicclassCopyBytes{
2. publicstaticvoidmain(String[]args)throwsIOException{
3. FileInputStreamin=null;
4. FileOutputStreamout=null;
5. try{
6. in=newFileInputStream("xanadu.txt");
7. out=newFileOutputStream("outagain.txt");
8. intc;
10. while((c=in.read())!=-1){
11. out.write(c);
12. }
14. }finally{
15. if(in!=null){
16. in.close();
17. }
18. if(out!=null){
19. out.close();
20. }
21. }
22. }
23. }

------------------------------------------------------------------------

缓冲存储

1. publicclassCopyCharacters{
2. publicstaticvoidmain(String[]args)throwsIOException{
3. FileReaderinputStream=null;
4. FileWriteroutputStream=null;
6. try{
7. inputStream=newFileReader("xanadu.txt");
8. outputStream=newFileWriter("characteroutput.txt");
10. intc;
11. while((c=inputStream.read())!=-1){
12. outputStream.write(c);
13. }
14. }finally{
15. if(inputStream!=null){
16. inputStream.close();
17. }
18. if(outputStream!=null){
19. outputStream.close();
20. }
21. }
22. }
23. }

------------------------------------------------------------------------------------

按行读取

1. publicclassCopyLines{
2. publicstaticvoidmain(String[]args)throwsIOException{
3. BufferedReaderinputStream=null;
4. PrintWriteroutputStream=null;
6. try{
7. inputStream=
8. newBufferedReader(newFileReader("xanadu.txt"));
9. outputStream=
10. newPrintWriter(newFileWriter("characteroutput.txt"));
12. Stringl;
13. while((l=inputStream.readLine())!=null){
14. outputStream.println(l);
15. }
16. }finally{
17. if(inputStream!=null){
18. inputStream.close();
19. }
20. if(outputStream!=null){
21. outputStream.close();
22. }
23. }
24. }
25. }

----------------------------------------------------------------------------

直接读取文件内容

1. publicclassScanXan{
2. publicstaticvoidmain(String[]args)throwsFileNotFoundException{
3. Scanners=null;
4. try{
5. s=newScanner(newBufferedReader(newFileReader("xanadu.txt")));
7. while(s.hasNext()){
8. System.out.println(s.next());
9. }
10. }finally{
11. if(s!=null){
12. s.close();
13. }
14. }
15. }
16. }

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