What is the difference between PrintWriter and FileWriter?

5 Answers. Although both of these internally uses a FileOutputStream , the main difference is that PrintWriter offers some additional methods for formatting like println and printf. Major Differences : FileWriter throws IOException in case of any IO failure.

What is PrintWriter in java?

The Java PrintWriter class ( java. io. PrintWriter ) enables you to write formatted data to an underlying Writer . The PrintWriter class has all the same methods as the PrintStream except for the methods to write raw bytes. Being a Writer subclass the PrintWriter is intended to write text.

What is FileWriter and PrintWriter in java?

PrintWriter and FileWriter are JAVA classes that allow writing data into files. public static void main(String[] args) { //creating object of class File using path – is not the same as. //creating file File filePrintWriter = new File(“printwriter.txt”); File fileFileWriter = new File(“filewriter.txt”);

Can we get PrintWriter and ServletOutputStream both in a servlet?

Can we get PrintWriter and ServletOutputStream both in a servlet? We can’t get instances of both PrintWriter and ServletOutputStream in a single servlet method, if we invoke both the methods; getWriter() and getOutputStream() on response; we will get java.

What is the difference between FileWriter and BufferedWriter?

FileWriter writes directly into Files and should be used only when the number of writes is less. BufferedWriter: BufferedWriter is almost similar to FileWriter but it uses internal buffer to write data into File. So if the number of write operations is more, the actual IO operations are less and performance is better.

What is flush () in Java?

The flush() method of PrintWriter Class in Java is used to flush the stream. By flushing the stream, it means to clear the stream of any element that may be or maybe not inside the stream.

What is the difference between flush and close in Java?

flush() writes the content of the buffer to the destination and makes the buffer empty for further data to store but it does not closes the stream permanently. That means you can still write some more data to the stream. But close() closes the stream permanently.

Why servlet is mostly used?

A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers.

Does PrintWriter overwrite files?

Solution: Pass false to the append parameter to overwrite the file: pw = new PrintWriter(new FileOutputStream(“Foo. Passing true for the second parameter indicates that you want to append to the file; passing false means that you want to overwrite the file.

How does a servlet send a response to a client?

Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponseobject and passes it as an argument to the servlet’s servicemethod. To send binary data in a MIME body response, use the ServletOutputStreamreturned by getOutputStream().

How to send character data in Java servletresponse?

To send character data, use the PrintWriterobject returned by getWriter(). To mix binary and text data, for example, to create a multipart response, use a ServletOutputStreamand manage the character sections manually.

What is public interface for servletresponse in Java?

All Known Implementing Classes: HttpServletResponseWrapper, ServletResponseWrapper public interface ServletResponse Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponseobject and passes it as an argument to the servlet’s servicemethod.

What does flush do in servletresponse in Java?

Returns a ServletOutputStreamsuitable for writing binary data in the response. The servlet container does not encode the binary data. Calling flush() on the ServletOutputStream commits the response. Either this method or getWriter()may be called to write the body, not both.