DTLS编写样例一coap协议

参考地址：https://github.com/nikosft/CoAP-examples/tree/master/src/DTLS

代码1：DTLS.java

/* * Copyright (C) 2015 fotiou * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program.  If not, see <http://www.gnu.org/licenses/>. */import java.io.BufferedReader;import java.io.FileInputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.net.InetSocketAddress;import java.security.KeyStore;import java.security.PrivateKey;import java.security.cert.Certificate;import org.eclipse.californium.core.CoapClient;import org.eclipse.californium.core.CoapServer;import org.eclipse.californium.core.network.CoAPEndpoint;import org.eclipse.californium.core.network.config.NetworkConfig;import org.eclipse.californium.scandium.DTLSConnector;import org.eclipse.californium.scandium.config.DtlsConnectorConfig;import org.eclipse.californium.scandium.dtls.cipher.CipherSuite;/** * A basic Hello World example over DTLS. The server and the client are located in the  * same machine. This class contains the main method that creates the server and the * client. Use the GenKeys.sh to generate the the keystore and the truststore. In * this example only the server is authenticated, using a self-signed certificate. * @author fotiou */public class DTLS {    //If you have modified GenKeys.sh modify the following variables accordingly    private final static String KEY_STORE_PASSWORD = "123456";    private static final String KEY_STORE_LOCATION = "keyStore.jks";    private final static String TRUST_STORE_PASSWORD = "123456";    private static final String TRUST_STORE_LOCATION = "trustStore.jks";    public static void main(String[] args) {            //prepapre server            CoapServer server = new CoapServer();             //create a new resource            HelloWorldResource resource = new HelloWorldResource();            //add the resource to the server            server.add(resource);            //prepare client            CoapClient client = new CoapClient("coap://localhost:5684/helloWorld");            //Creates a new handler            HelloWorldHandler handler = new HelloWorldHandler();            try {                    //Here starts DTLS configuration of the server                    // load the key store                    KeyStore keyStore = KeyStore.getInstance("JKS");                    InputStream in = new FileInputStream(KEY_STORE_LOCATION);                    keyStore.load(in, KEY_STORE_PASSWORD.toCharArray());                    DtlsConnectorConfig.Builder serverConfig = new DtlsConnectorConfig.Builder(new InetSocketAddress(5684));                    serverConfig.setSupportedCipherSuites(new CipherSuite[]{                                    CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8});                    serverConfig.setIdentity((PrivateKey)keyStore.getKey("server", KEY_STORE_PASSWORD.toCharArray()),                                    keyStore.getCertificateChain("server"), true);                    serverConfig.setClientAuthenticationRequired(false);                    DTLSConnector serverConnector = new DTLSConnector(serverConfig.build(), null);                    server.addEndpoint(new CoAPEndpoint(serverConnector, NetworkConfig.getStandard()));                    server.start();                    //Here starts DTLS configuration of the client                    //load the trust store                    KeyStore trustStore = KeyStore.getInstance("JKS");                    InputStream inTrust = new FileInputStream(TRUST_STORE_LOCATION);                    trustStore.load(inTrust, TRUST_STORE_PASSWORD.toCharArray());                    //load certificates                    Certificate[] trustedCertificates = new Certificate[1];                    trustedCertificates[0] = trustStore.getCertificate("server");                    DtlsConnectorConfig.Builder clientConfig = new DtlsConnectorConfig.Builder(new InetSocketAddress(0));                    clientConfig.setTrustStore(trustedCertificates);                    clientConfig.setSupportedCipherSuites(new CipherSuite[]{                                    CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8});                    DTLSConnector clientConnector = new DTLSConnector(clientConfig.build(), null);                    client.setEndpoint(new CoAPEndpoint(clientConnector, NetworkConfig.getStandard()));                    //start the client                    client.get(handler);                    //Just a trick to wait until the user press enter                    System.out.println("Press enter to close the server and end the program");                    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));                    br.readLine();                    //Stop the server                     server.destroy();            } catch (Exception e) {                     System.out.println("Exception " + e.toString());                     e.printStackTrace();            }    }}

代码2:HelloWorldHandler.java

import org.eclipse.californium.core.CoapHandler;import org.eclipse.californium.core.CoapResponse;/** * This is a simple Handler. It prints the server's response or if an error occurs * it prints the error. * @author fotiou */public class HelloWorldHandler implements CoapHandler{    /**     * It is called when the CoAP server responds with some content. It prints the content of the      * response.     * @param response The response of the server     */    @Override    public void onLoad(CoapResponse response) {        String content = response.getResponseText();System.out.println("Received response from Server : " + content);    }    /**     * It is called when an error occurs.     */    @Override    public void onError() {        System.out.println("Error");    }    }

代码3:HelloWorldResource.java

import org.eclipse.californium.core.CoapResource;import org.eclipse.californium.core.server.resources.CoapExchange;/** * This is a basic resource. It can be accessed using the GET method and returns * the string ''Hello World'' * @author Nikos Fotiou */public class HelloWorldResource extends CoapResource {            /**     * The constructor     */        public HelloWorldResource() {              // set resource identifier            super("helloWorld");        }            /**     * It is called when a GET method is received.      * @param exchange The user request     */    @Override    public void handleGET(CoapExchange exchange) {        exchange.respond("Hello World!!");    }    }