Get URL parameters using JDK HTTP serverTag(s): Networking
The server is very simple. If you want to access parameters passed in the URL (using the GET method) then you need to provide a method to extract them.
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.Map;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
public class SimpleHttpServer2 {
public static void main(String[] args) throws Exception {
HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
server.createContext("/info", new InfoHandler());
server.createContext("/get", new GetHandler());
server.setExecutor(null); // creates a default executor
server.start();
System.out.println("The server is running");
}
// http://localhost:8000/info
static class InfoHandler implements HttpHandler {
public void handle(HttpExchange httpExchange) throws IOException {
String response = "Use /get?hello=word&foo=bar to see how to handle url parameters";
SimpleHttpServer2.writeResponse(httpExchange, response.toString());
}
}
static class GetHandler implements HttpHandler {
public void handle(HttpExchange httpExchange) throws IOException {
StringBuilder response = new StringBuilder();
Map <String,String>parms = SimpleHttpServer2.queryToMap(httpExchange.getRequestURI().getQuery());
response.append("<html><body>");
response.append("hello : " + parms.get("hello") + "<br/>");
response.append("foo : " + parms.get("foo") + "<br/>");
response.append("</body></html>");
SimpleHttpServer2.writeResponse(httpExchange, response.toString());
}
}
public static void writeResponse(HttpExchange httpExchange, String response) throws IOException {
httpExchange.sendResponseHeaders(200, response.length());
OutputStream os = httpExchange.getResponseBody();
os.write(response.getBytes());
os.close();
}
/**
* returns the url parameters in a map
* @param query
* @return map
*/
public static Map<String, String> queryToMap(String query){
Map<String, String> result = new HashMap<String, String>();
for (String param : query.split("&")) {
String pair[] = param.split("=");
if (pair.length>1) {
result.put(pair[0], pair[1]);
}else{
result.put(pair[0], "");
}
}
return result;
}
}
See these related HowTo :