[FIXED] Difference between PrintWriter out = new PrintWriter(sWriter) and Printwriter out = response.getWriter()

Issue

StringWriter sWriter = new StringWriter();
PrintWriter out = new PrintWriter(sWriter);

out.println("Hello World");
response.getWriter().print(sWriter.toString());

OR

Printwriter out = response.getWriter();

1. What is difference between these two while we use them in Java Servlet
2. Which one is efficient in Servlet

Solution

StringWriter sWriter = new StringWriter();
PrintWriter out = new PrintWriter(sWriter);

out.println("Hello World");
response.getWriter().print(sWriter.toString());

This creates a StringWriter that is independent of the response. It creates a String with the content you put in it and then takes that and puts it into PrintWriter of the response.

PrintWriter out = response.getWriter();

This just gets the PrintWriter that writes to the response.

If you write to that, it is directly given to the response.

The second method is more efficient because java doesn't have to create a single String with your whole content but can directly deliver it.

Answered By - dan1st
Answer Checked By - Timothy Miller (JavaFixing Admin)