如何在Java 环境下使用 HTTP 协议收发 MQ 消息

1. 准备环境
在工程 POM 文件添加 HTTP Java 客户端的依赖。

     <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-client</artifactId>
        <version>9.3.4.RC1</version>
      </dependency>    
      <dependency>
        <groupId>com.aliyun.openservices</groupId>
        <artifactId>ons-client</artifactId>
        <version>1.1.11</version>
      </dependency>

2. 运行代码配置（user.properties）
您需要设置配置文件(user.properties)的相关内容，具体请参考申请 MQ 资源 。

    #您在控制台创建的Topic
    Topic=xxx
    #公测url
    URL=http://publictest-rest.ons.aliyun.com
    #阿里云身份验证码
    Ak=xxx
    #阿里云身份验证密钥
    Sk=xxx
    #MQ控制台创建的Producer ID
    ProducerID=xxx
    #MQ控制台创建的Consumer ID
    ConsumerID=xxx

说明：URL 中的 Key，Tag以及 POST Content-Type 没有任何的限制，只要确保Key 和 Tag 相同唯一即可，可以放在 user.properties 里面。
3. HTTP 发送消息示例代码
您可以按以下说明设置相应参数并测试 HTTP 消息发送功能。

    package com.aliyun.openservice.ons.http.demo;
    import java.nio.charset.Charset;
    import java.util.Date;
    import java.util.Properties;
    import org.eclipse.jetty.client.HttpClient;
    import org.eclipse.jetty.client.api.ContentProvider;
    import org.eclipse.jetty.client.api.ContentResponse;
    import org.eclipse.jetty.client.api.Request;
    import org.eclipse.jetty.client.util.StringContentProvider;
    import com.aliyun.openservices.ons.api.impl.authority.AuthUtil;
    public class HttpProducer {
        public static String SIGNATURE="Signature";
        public static String NUM="num";
        public static String CONSUMERID="ConsumerID";
        public static String PRODUCERID="ProducerID";
        public static String TIMEOUT="timeout";
        public static String TOPIC="Topic";
        public static String AK="AccessKey";
        public static String BODY="body";  
        public static String MSGHANDLE="msgHandle";
        public static String TIME="time";
        public static void main(String[] args) throws Exception {
            HttpClient httpClient=new HttpClient();   
            httpClient.setMaxConnectionsPerDestination(1);
            httpClient.start();  
            Properties properties=new Properties();
            properties.load(HttpProducer.class.getClassLoader().getResourceAsStream("user.properties"));
            String topic=properties.getProperty("Topic"); //请在user.properties配置您的Topic
            String url=properties.getProperty("URL");//公测集群配置为http://publictest-rest.ons.aliyun.com/
            String ak=properties.getProperty("Ak");//请在user.properties配置您的Ak
            String sk=properties.getProperty("Sk");//请在user.properties配置您的Sk
            String pid=properties.getProperty("ProducerID");//请在user.properties配置您的Producer ID
            String date=String.valueOf(new Date().getTime());  
            String sign=null;
            String body="hello ons http";
            String NEWLINE="
";
            String signString;
            for (int i = 0; i < 10; i++) {
                date=String.valueOf(new Date().getTime());
                Request req=httpClient.POST(url+"message/?topic="+topic+"&time="+date+"&tag=http"+"&key=http");
                ContentProvider content=new StringContentProvider(body);
                req.content(content);
                signString=topic+NEWLINE+pid+NEWLINE+MD5.getInstance().getMD5String(body)+NEWLINE+date;
                System.out.println(signString);
                sign=AuthUtil.calSignature(signString.getBytes(Charset.forName("UTF-8")), sk);
                req.header(SIGNATURE, sign);
                req.header(AK, ak);
                req.header(PRODUCERID, pid);
                ContentResponse response;
                response=req.send();
                System.out.println("send msg:"+response.getStatus()+response.getContentAsString());
            }   
        }
    }

4. HTTP接收消息示例代码
请按以下说明设置相应参数并测试 HTTP 消息接收功能。

    package com.aliyun.openservice.ons.http.demo;
    import java.nio.charset.Charset;
    import java.util.Date;
    import java.util.List;
    import java.util.Properties;
    import org.eclipse.jetty.client.HttpClient;
    import org.eclipse.jetty.client.api.ContentProvider;
    import org.eclipse.jetty.client.api.ContentResponse;
    import org.eclipse.jetty.client.api.Request;
    import org.eclipse.jetty.client.util.StringContentProvider;
    import org.eclipse.jetty.http.HttpMethod;
    import com.alibaba.fastjson.JSON;
    import com.aliyun.openservice.ons.mqtt.demo.MqttProducer;
    import com.aliyun.openservices.ons.api.impl.authority.AuthUtil;
    public class HttpConsumer {
        public static String SIGNATURE="Signature";
        public static String NUM="num";
        public static String CONSUMERID="ConsumerID";
        public static String PRODUCERID="ProducerID";
        public static String TIMEOUT="timeout";
        public static String TOPIC="Topic";
        public static String AK="AccessKey";
        public static String BODY="body";  
        public static String MSGHANDLE="msgHandle";
        public static String TIME="time";
        public static void main(String[] args) throws Exception {
            HttpClient httpClient=new HttpClient();   
            httpClient.setMaxConnectionsPerDestination(1);
            httpClient.start();  
            Properties properties=new Properties();
            properties.load(HttpConsumer.class.getClassLoader().getResourceAsStream("user.properties"));
            String topic=properties.getProperty("Topic"); //请在user.properties配置您的topic
            String url=properties.getProperty("URL");//公测集群配置为http://publictest-rest.ons.aliyun.com/
            String ak=properties.getProperty("Ak");//请在user.properties配置您的Ak
            String sk=properties.getProperty("Sk");//请在user.properties配置您的Sk
            String cid=properties.getProperty("ConsumerID");//请在user.properties配置您的Consumer ID
            String date=String.valueOf(new Date().getTime());  
            String sign=null;
            String NEWLINE="
";
            String signString;
            System.out.println(NEWLINE+NEWLINE);
            while (true) {  
                try {
                    date=String.valueOf(new Date().getTime());
                    Request req=httpClient.POST(url+"message/?topic="+topic+"&time="+date+"&num="+32);
                    req.method(HttpMethod.GET);
                    ContentResponse response;
                    signString=topic+NEWLINE+cid+NEWLINE+date;
                    sign=AuthUtil.calSignature(signString.getBytes(Charset.forName("UTF-8")), sk);
                    req.header(SIGNATURE, sign);
                    req.header(AK, ak);
                    req.header(CONSUMERID, cid);
                    long start=System.currentTimeMillis();
                    response=req.send();
                    System.out.println("get cost:"+(System.currentTimeMillis()-start)/1000  
                                       +"    "+response.getStatus()+"    "+response.getContentAsString());  
                    List<SimpleMessage> list = null;
                    if (response.getContentAsString()!=null&&!response.getContentAsString().isEmpty()) {
                         list=JSON.parseArray(response.getContentAsString(), SimpleMessage.class);
                    }
                    if (list==null||list.size()==0) {
                        Thread.sleep(100);
                        continue;
                    }   
                    System.out.println("size is :"+list.size());
                    for (SimpleMessage simpleMessage : list) {
                        date=String.valueOf(new Date().getTime());
                        System.out.println("receive msg:"+simpleMessage.getBody()+"   born time "+simpleMessage.getBornTime());
                        req=httpClient.POST(url+"message/?msgHandle="+simpleMessage.getMsgHandle()+"&topic="+topic+"&time="+date);
                        req.method(HttpMethod.DELETE);
                        signString=topic+NEWLINE+cid+NEWLINE+simpleMessage.getMsgHandle()+NEWLINE+date;
                        sign=AuthUtil.calSignature(signString.getBytes(Charset.forName("UTF-8")), sk);
                        req.header(SIGNATURE, sign);
                        req.header(AK, ak);
                        req.header(CONSUMERID, cid);
                        response=req.send();    
                        System.out.println("delete msg:"+response.toString());
                    }  
                    Thread.sleep(100);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

5. HTTP示例程序工具类
(1)消息封装类: SimpleMessage.java

    package com.aliyun.openservice.ons.http.demo;
    public class SimpleMessage {
        private String body;
        private String msgId;
        private String bornTime;
        private String msgHandle;
        private int reconsumeTimes;
        private String tag;
        public void setTag(String tag) {
            this.tag = tag;
        }
        public String getTag() {
            return tag;
        }
        public int getReconsumeTimes() {
            return reconsumeTimes;
        }
        public void setReconsumeTimes(int reconsumeTimes) {
            this.reconsumeTimes = reconsumeTimes;
        }
        public void setMsgHandle(String msgHandle) {
            this.msgHandle = msgHandle;
        }
        public String getMsgHandle() {
            return msgHandle;
        }
        public String getBody() {
            return body;
        }
        public void setBody(String body) {
            this.body = body;
        }
        public String getMsgId() {
            return msgId;
        }
        public void setMsgId(String msgId) {
            this.msgId = msgId;
        }
        public String getBornTime() {
            return bornTime;
        }
        public void setBornTime(String bornTime) {
            this.bornTime = bornTime;
        }
    }

(2)字符串签名类: MD5.java

    package com.aliyun.openservice.ons.http.demo;
    import java.io.UnsupportedEncodingException;
    import java.nio.charset.Charset;
    import java.security.MessageDigest;
    import java.sql.SQLException;
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    import java.util.concurrent.locks.ReentrantLock;
    import org.slf4j.LoggerFactory;
    public class MD5 {
        private static final org.slf4j.Logger log = LoggerFactory.getLogger(MD5.class);
        private static char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        private static Map<Character, Integer> rDigits = new HashMap<Character, Integer>(16);
        static {
            for (int i = 0; i < digits.length; ++i) {
                rDigits.put(digits[i], i);
            }
        }
        private static MD5 me = new MD5();
        private MessageDigest mHasher;
        private final ReentrantLock opLock = new ReentrantLock();
        private MD5() {
            try {
                this.mHasher = MessageDigest.getInstance("md5");
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        public static MD5 getInstance() {
            return me;
        }
        public String getMD5String(String content) {
            return this.bytes2string(this.hash(content));
        }
        public String getMD5String(byte[] content) {
            return this.bytes2string(this.hash(content));
        }
        public byte[] getMD5Bytes(byte[] content) {
            return this.hash(content);
        }
        public byte[] hash(String str) {
            this.opLock.lock();
            try {
                byte[] bt = this.mHasher.digest(str.getBytes("utf-8"));
                if (null == bt || bt.length != 16) {
                    throw new IllegalArgumentException("md5 need");
                }
                return bt;
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException("unsupported utf-8 encoding", e);
            } finally {
                this.opLock.unlock();
            }
        }
        public byte[] hash(byte[] data) {
            this.opLock.lock();
            try {
                byte[] bt = this.mHasher.digest(data);
                if (null == bt || bt.length != 16) {
                    throw new IllegalArgumentException("md5 need");
                }
                return bt;
            } finally {
                this.opLock.unlock();
            }
        }
        public String bytes2string(byte[] bt) {
            int l = bt.length;
            char[] out = new char[l << 1];
            for (int i = 0, j = 0; i < l; i++) {
                out[j++] = digits[(0xF0 & bt[i]) >>> 4];
                out[j++] = digits[0x0F & bt[i]];
            }
            if (log.isDebugEnabled()) {
                log.debug("[hash]" + new String(out));
            }
            return new String(out);
        }
        public byte[] string2bytes(String str) {
            if (null == str) {
                throw new NullPointerException("Argument is not allowed empty");
            }
            if (str.length() != 32) {
                throw new IllegalArgumentException("String length must equals 32");
            }
            byte[] data = new byte[16];
            char[] chs = str.toCharArray();
            for (int i = 0; i < 16; ++i) {
                int h = rDigits.get(chs[i * 2]).intValue();
                int l = rDigits.get(chs[i * 2 + 1]).intValue();
                data[i] = (byte) ((h & 0x0F) << 4 | l & 0x0F);
            }
            return data;
        }
    }