Java by API/javax.servlet/ServletResponse

ServletResponse: getBufferSize()

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Buffering extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setBufferSize(8 * 1024); // 8K 
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();
    int size = res.getBufferSize(); // returns 8096 or greater
    log("The default buffer size is " + size);
    out.println("The client won"t see this");
    res.reset();
    out.println("Nor will the client see this!");
    res.reset();
    out.println("And this won"t be seen if sendError() is called");
    if (req.getParameter("param") == null) {
      res.sendError(res.SC_BAD_REQUEST, "param needed");
    }
  }
}

ServletResponse: getWriter()

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MainServlets extends HttpServlet {
  int count;
  public void init() throws ServletException {
    String initial = getInitParameter("initial");
    try {
      count = Integer.parseInt(initial);
    } catch (NumberFormatException e) {
      count = 0;
    }
  }
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();
    count++;
    out.println("Since loading (and with a possible initialization");
    out.println("parameter figured in), this servlet has been accessed");
    out.println(count + " times.");
  }
}

ServletResponse: reset()

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Buffering extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setBufferSize(8 * 1024); // 8K 
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();
    int size = res.getBufferSize(); // returns 8096 or greater
    log("The default buffer size is " + size);
    out.println("The client won"t see this");
    res.reset();
    out.println("Nor will the client see this!");
    res.reset();
    out.println("And this won"t be seen if sendError() is called");
    if (req.getParameter("param") == null) {
      res.sendError(res.SC_BAD_REQUEST, "param needed");
    }
  }
}

ServletResponse: setContentType(String arg0)

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MainServlets extends HttpServlet {
  int count;
  public void init() throws ServletException {
    String initial = getInitParameter("initial");
    try {
      count = Integer.parseInt(initial);
    } catch (NumberFormatException e) {
      count = 0;
    }
  }
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();
    count++;
    out.println("Since loading (and with a possible initialization");
    out.println("parameter figured in), this servlet has been accessed");
    out.println(count + " times.");
  }
}