A while back, I ranted about the Simple Framework example code and its unnecessary complexity. It turns out that their HTTP server library is indeed simple, if you just ignore the Spring setup and their example. In fact, as this static file server example shows, it’s very similar to the “hidden” Sun HTTP handler API.

The only interface which has to be implemented is the Container, which is equivalent to the request HttpHandler in the Sun HTTP library. The handle() method takes a normal HTTP request, and the response code and data can be written via the Response object. The first code block below shows a simple handler.

The next block shows how to tie the required Simple Framework classes together to start the server. The Container just mentioned goes into a ContainerSocketProcessor where concurrent processing can be setup up. The processor goes into a SocketConnection which connects to a socket on a given host and port, and the server runs.

  static class StaticFileContainer implements Container {

    private String baseDir;

    StaticFileContainer(String baseDir) {
      this.baseDir = baseDir;
    }

    @Override
    public void handle(Request req, Response resp) {
      System.out.println(req);
      System.out.println("target: " + req.getTarget());

      Path path = Paths.get(baseDir, req.getTarget());

      resp.setCode(200);
      try {
        resp.getByteChannel().write(ByteBuffer.wrap(Files.readAllBytes(path)));
        resp.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  public void setup() throws IOException {
    StaticFileContainer container = new StaticFileContainer("com/rememberjava/http");
    ContainerSocketProcessor server = new ContainerSocketProcessor(container, 1);
    connection = new SocketConnection(server);

    connection.connect(new InetSocketAddress(PORT));
  }

Here is the full server example, started and verified as a unit test.

SfHttpServerTest.java
GitHub Raw 
/* Copyright rememberjava.com. Licensed under GPL 3. See http://rememberjava.com/license */
package com.rememberjava.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
import org.simpleframework.http.core.Container;
import org.simpleframework.http.core.ContainerSocketProcessor;
import org.simpleframework.transport.connect.SocketConnection;

public class SfHttpServerTest {

  private static final int PORT = 8889;

  static class StaticFileContainer implements Container {

    private String baseDir;

    StaticFileContainer(String baseDir) {
      this.baseDir = baseDir;
    }

    @Override
    public void handle(Request req, Response resp) {
      System.out.println(req);
      System.out.println("target: " + req.getTarget());

      Path path = Paths.get(baseDir, req.getTarget());

      resp.setCode(200);
      try {
        resp.getByteChannel().write(ByteBuffer.wrap(Files.readAllBytes(path)));
        resp.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  private SocketConnection connection;

  @Before
  public void setup() throws IOException {
    StaticFileContainer container = new StaticFileContainer("com/rememberjava/http");
    ContainerSocketProcessor server = new ContainerSocketProcessor(container, 1);
    connection = new SocketConnection(server);

    connection.connect(new InetSocketAddress(PORT));
  }

  @After
  public void close() throws IOException {
    connection.close();
  }

  @Test
  public void testRequest() throws Exception {
    URL url = new URL("http://localhost:8889/test.txt");
    BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
    in.lines().forEach(System.out::println);
    in.close();
  }
}