Converting UTF-8 to ISO-8859-1

You don't need to convert String - only files. Do you mean a file?

open the file using utf8 and save it using ISO88591, which part exactly are you having problems with?

I am reading xml file , which has UTF-8 string.I want to store it in ISO .Lets say  
‘Citizens for NYC’ Board
this is string in xml .
I want to store it in db which having charset  US7ASCII.
I cannt change database charset.

As i mentioned, you don't need to convert String. They are already ported/portable between encodings

try specifying the charset in the jdbc connection string

If I dont change ,
   in jsp it look like ‘Citizens for NYC’

How to specify charset in jdbc connection string.?

>>If I dont change ,
   in jsp it look like ‘Citizens for NYC’

Those left and right quotes are not supported in ISO8859-1

> If I dont change ,
>   in jsp it look like ‘Citizens for NYC’

sounds like you'd be better off handling it when you *read* the data from the database

I am using following string method to read and covert it into utf-8
getBytes(ENCODING_ISO_8859_1),ENCODING_UTF8)

As i just mentioned, shifting encodings won't help - those quotes are not supported in ISO8859-1. You need to do

s = s.replaceAll("[\u2018\u2019]", "'");

See

http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html

string.getBytes(ISO-8859-1),UTF-8)

>>s = s.replaceAll("[\u2018\u2019]", "'");

when should I use this method , while inserting or reading?

>>when should I use this method , while inserting or reading?

Before inserting - it will get rid of the unsupportable characters

Then how to find , character which is not supported , what should be equivalent to that char and store it in db.
  and is there any difference in output?

>>Then how to find , character which is not supported , what should be equivalent to that char and store it in db.

That's quite subjective - it would be down to you to find the ones that aren't supported and choose another you like better

>>and is there any difference in output?

Yes - they're quite different characters

see if this helps

http://www.htmlhelp.com/reference/charset/

So my steps should be,
read xml,
  read char by char , replace unsupported character with supported characters, store it in db,
  While reading , do I need to convert it in UTF to show on JSP?

So can you give one example, so that I can do it for all other characters.
If possible UTF-8 character list and ISO character list..

Well i gave you an example at http:Q_21867758.html#16788340

As i mentioned, the replacements are a matter of judgement. If you read that link i posted, for instance, you'll see that in the Unix world, people have the habit of using ` for a left quote - quite different to the replacement i suggested

:-)