com.sun.net.httpserver 这个工具包，提供了一些原始的工具
Java Doc 对com.sun.net.httpserver的说明：
This class implements a simple HTTP server. A HttpServer is bound to an IP address and port number and listens for incoming TCP connections from clients on this address. The sub-class HttpsServer implements a server which handles HTTPS requests.
创建httpContext，实现地址的HttpHandler
com.sun.net.httpserver.HttpHandler
A handler which is invoked to process HTTP exchanges. Each HTTP exchange is handled by one of these handlers.
一个简单的例子
在写下面的例子的过程中，让我觉得跟早期tomcat 4.0的处理http的逻辑有点像，写的过程中有点亲切感。只不过tomcat 4.0的代码用的是原始java.net包的Socket和ServerSocket来处理网络通信。而com.sun.net.httpserver进行了一定的封装，简化了实现逻辑。
public class HttpServerTest {
public static void main(String[] args) {
run(args);
}
public static void run(String[] args) {
try {
String url = "localhost";
int port = 8080;
HttpServer httpServer = HttpServer.create(new InetSocketAddress(url, port), 0);
httpServer.createContext("/index", new CustomHttpHandler());
httpServer.setExecutor(Executors.newFixedThreadPool(10));
httpServer.start();
log.info("http server start on port:{} .", port);
} catch (IOException e) {
e.printStackTrace();
}
}
private static class CustomHttpHandler implements HttpHandler {
@Override
public void handle(HttpExchange httpExchange) throws IOException {
String requestParamValue = null;
if ("get".equalsIgnoreCase(httpExchange.getRequestMethod())) {
requestParamValue = handleGetRequest(httpExchange);
} else if ("post".equals(httpExchange.getRequestMethod())) {
requestParamValue = handlePostRequest(httpExchange);
}
handleResponse(httpExchange, requestParamValue);
}
private void handleResponse(HttpExchange httpExchange, String requestParamValue) {
OutputStream outputStream = httpExchange.getResponseBody();
StringBuilder htmlBuilder = new StringBuilder();
htmlBuilder.append("<html>").append("<body>").
append("<h1>").append("Hello,I Love You!\nrequestParamValue:").append(requestParamValue).append("</h1>").
append("</body>").append("</html>");
String htmlResponse = htmlBuilder.toString();
try {
httpExchange.sendResponseHeaders(200, htmlResponse.length());
outputStream.write(htmlResponse.getBytes());
outputStream.flush();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private String handleGetRequest(HttpExchange httpExchange) {
return httpExchange.getRequestURI().toString().split("\\?")[1].split("=")[1];
}
private String handlePostRequest(HttpExchange httpExchange) {
return null;
}
}
}
（完）