I have a method which reads a file and returns a string, but I wanted to return a reader. I want to convert the string to a reader, or I want to read the file and return the reader. How can I do this?
-
String Reader is working fine. I have used filereader instead of writing my own method this is simpler. (Reader)new FileReader(filePath);Arasu– Arasu2011-12-19 08:01:24 +00:00Commented Dec 19, 2011 at 8:01
Add a comment
|
4 Answers
Use java.io.StringReader: return new StringReader(string);.
Next time you need a reader, you can check the "Direct known subclasses" of the Reader class. Same goes for InputStream, etc. The place to start is the javadoc - it contains quite a lot of useful information.
But for your task at hand, you'd better follow Jon Lin' advice of simply using a FileReader. There is no need to go through String. (For that, my advice from the previous paragraph applies as well)
2 Comments
hendalst
I'd add that if you're using Eclipse, pulling up a tree of all known subclasses for any type is as easy as hitting F4 when the cursor is on the type (e.g.
Reader). I presume other IDEs are similarly equipped. Tremendously helpful in these situations.
Lukas Knuth
This answers the literal question in the title and is probably why 90% came here. But @JonLin's answer has a better solution for the specific situation described by OP.
Or you can simply create a FileReader and return that.
1 Comment
Jon Lin
He says he has a method that reads a file and he wants to return a Reader instead of a String
You can use StringReader class from java.io package.
String stringToBeParsed = "The quick brown fox jumped over the lazy dog";
StringReader reader = new StringReader(stringToBeParsed);
1 Comment
Tomasz Nurkiewicz
"jumpS", not "jumpED", otherwise not all 26 characters are used ;-).
Try this sample code,
FileInputStream in = null;
StringBuilder sb = new StringBuilder();
String tempString = null;
Reader initialReader;
try {
in = new FileInputStream(filename);
initialReader = new InputStreamReader(in);
char[] arr = new char[8 * 1024];
StringBuilder buffer = new StringBuilder();
int numCharsRead;
while ((numCharsRead = initialReader.read(arr, 0, arr.length)) != -1) {
buffer.append(arr, 0, numCharsRead);
}
String targetString = buffer.toString();
result = IOUtils.toByteArray(targetString);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
