HTTP MIME Response : MIME « Network Protocol « Java

HTTP MIME Response

//Revised from jcommon web;

import java.util.*;

public class HTTPResponse {
  public static final HashMap<String,String> MIME_TYPES = new HashMap<String,String>();
  static {
    MIME_TYPES.put("gif", "image/gif");
    MIME_TYPES.put("jpeg", "image/jpeg");
    MIME_TYPES.put("jpg", "image/jpeg");
    MIME_TYPES.put("jpe", "image/jpeg");
    MIME_TYPES.put("bmp", "image/bmp");
    MIME_TYPES.put("png", "image/png");
    MIME_TYPES.put("tif", "image/tiff");
    MIME_TYPES.put("tiff", "image/tiff");
    MIME_TYPES.put("jnlp", "application/x-java-jnlp-file");
    MIME_TYPES.put("js", "application/x-javascript");
    MIME_TYPES.put("doc", "application/msword");
    MIME_TYPES.put("bin", "application/octet-stream");
    MIME_TYPES.put("exe", "application/octet-stream");
    MIME_TYPES.put("pdf", "application/pdf");
    MIME_TYPES.put("ai", "application/postscript");
    MIME_TYPES.put("eps", "application/postscript");
    MIME_TYPES.put("ps", "application/postscript");
    MIME_TYPES.put("rtf", "application/rtf");
    MIME_TYPES.put("class", "application/x-java-vm");
    MIME_TYPES.put("ser", "application/x-java-serialized-object");
    MIME_TYPES.put("jar", "application/x-java-archive");
    MIME_TYPES.put("sh", "application/x-sh");
    MIME_TYPES.put("tar", "application/x-tar");
    MIME_TYPES.put("zip", "application/zip");
    MIME_TYPES.put("ua", "audio/basic");
    MIME_TYPES.put("wav", "audio/x-wav");
    MIME_TYPES.put("mid", "audio/x-midi");
    MIME_TYPES.put("htm", "text/html");
    MIME_TYPES.put("html", "text/html");
    MIME_TYPES.put("css", "text/css");
    MIME_TYPES.put("txt", "text/plain");
    MIME_TYPES.put("mpeg", "video/mpeg");
    MIME_TYPES.put("mpg", "video/mpeg");
    MIME_TYPES.put("mpe", "video/mpeg");
    MIME_TYPES.put("qt", "video/quicktime");
    MIME_TYPES.put("mov", "video/quicktime");
    MIME_TYPES.put("avi", "video/avi");
    MIME_TYPES.put("movie", "video/x-sgi-movie");
  public static String SERVER = "JavaWebServer/1.0";
  public static final int OK = 200;
  private Socket s;
  private int mode;
  private HashMap<String,String> headers;
  private HashSet<String> keys;
  public HTTPResponse(Socket s, int mode) throws IOException {
    this.s = s;
    this.mode = mode;
    headers = new HashMap<String,String>();
    keys = new HashSet<String>();
  public void addHeader(String header, String value) {
    headers.put(header, value);
  private void writeHeaders() throws IOException {
    if (mode == OK) {
      writeLine("HTTP/1.1 200 OK");
    if (!keys.contains("server")) {
      headers.put("Server", SERVER);
    if (!keys.contains("date")) {
      headers.put("Date", String.format("%EEE%, %d% %MMM% %yyyy% %HH%:%mm%:%ss% %Z%",new GregorianCalendar()));
    Iterator<String> iterator = headers.keySet().iterator();
    String key;
    String value;
    while (iterator.hasNext()) {
      key =;
      value = headers.get(key);
      writeLine(key + ": " + value);
  private void writeLine(String string) throws IOException {
    s.getOutputStream().write((string + "\r\n").getBytes());
  public void writeFile(File f) throws IOException {
    if ((!keys.contains("content-type")) && (f.getName().indexOf('.') > -1)) {
      String ext = f.getName().substring(f.getName().lastIndexOf('.') + 1).toLowerCase();
      if (MIME_TYPES.containsKey(ext)) {
        headers.put("Content-Type", MIME_TYPES.get(ext));
    if (!keys.contains("content-length")) {
      headers.put("Content-Length", String.valueOf(f.length()));
    FileInputStream fis = new FileInputStream(f);
    byte[] b = new byte[512];
    int len;
    while ((len = > -1) {
      s.getOutputStream().write(b, 0, len);


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3.A utility class, which provides some MIME related application logic.
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6.Declaring MIME types to use for various requests and provide utility manipulation methods
7.Map file extensions to MIME types. Based on the Apache mime.types file
8.Frequently used MIME types
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10.enum Mime Type
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