Restore mysql doesn't work with Runtime?

Question

hi all
iam trying to restore a backup of mysql database,i took the backup using mysqldump.
iam using a correct syntax of restoring and i already tested it in the command line and it worked correctly
mysql -u root new_db < f:\backup.sql
the problem is when i try to use the same command with Runtime it doesn't work
here's my code:
try{ String command="c:\\wamp\\mysql\\bin\\mysql -u root new_db < f:\\backup.sql"; Runtime.getRuntime().exec(command); }catch(Exception e){e.printStackTrace();}
and i already read the recommended article
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=1
but i don't know if there's something missing in my code
hope to find help
thanks in advance

Answer 1

i implemented the backup part after modifications and it worked correclty:
         try{
         String path=textfield1.getText().replace('\\','/');
         String file_path=path+"/"+"backup.sql";
         File backupFile = new File(file_path);
         FileWriter fw = new FileWriter(backupFile);
         Runtime runtime = Runtime.getRuntime();        
         Process child = runtime.exec("c:/wamp/mysql/bin/mysqldump --user=root --lock-all-tables --opt library");
         InputStreamReader irs = new InputStreamReader(child.getInputStream());
            BufferedReader br = new BufferedReader(irs);
           String line;
            while( (line=br.readLine()) != null ) {
                fw.write(line + "\n");
            fw.close();
            irs.close();
            br.close();
                 }catch(Exception e){e.printStackTrace();}but when i try to implement the restore part as above it doesn't work
could anyone tell me please where's the error?
try{
         String path=textfield2.getText().replace('\\','/');
         String file_path=path+"/"+"backup.sql";
         System.out.println(file_path);
         File backupFile = new File(file_path);
         FileWriter fw = new FileWriter(backupFile);
         Runtime runtime = Runtime.getRuntime();
         String command="c:/wamp/mysql/bin/mysql -u root lib < "+file_path;        
         Process child = runtime.exec(command);
         InputStreamReader irs = new InputStreamReader(child.getInputStream());
            BufferedReader br = new BufferedReader(irs);
           String line;
            while( (line=br.readLine()) != null ) {
                fw.write(line + "\n");
            fw.close();
            irs.close();
            br.close();
                }catch(Exception e){e.printStackTrace();}