java redis使用之利用jedis实现redis消息队列

应用场景

最近在公司做项目，需要对聊天内容进行存储，考虑到数据库查询的IO连接数高、连接频繁的因素，决定利用缓存做。

从网上了解到redis可以对所有的内容进行二进制的存储，而java是可以对所有对象进行序列化的，序列化的方法会在下面的代码中提供实现。

序列化

这里我编写了一个java序列化的工具，主要是对对象转换成byte[]，和根据byte[]数组反序列化成java对象；

主要是用到了ByteArrayOutputStream和ByteArrayInputStream；

需要注意的是每个自定义的需要序列化的对象都要实现Serializable接口；

其代码如下：

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

packagecom.bean.util;

 

importjava.io.ByteArrayInputStream;

importjava.io.ByteArrayOutputStream;

importjava.io.IOException;

importjava.io.ObjectInputStream;

importjava.io.ObjectOutputStream;

publicclass ObjectUtil {

    /**对象转byte[]

     * @param obj

     * @return

     * @throws IOException

     */

    publicstatic byte[] objectToBytes(Object obj) throwsException{

        ByteArrayOutputStream bo = newByteArrayOutputStream();

        ObjectOutputStream oo = newObjectOutputStream(bo);

        oo.writeObject(obj);

        byte[] bytes = bo.toByteArray();

        bo.close();

        oo.close();

        returnbytes;

    }

    /**byte[]转对象

     * @param bytes

     * @return

     * @throws Exception

     */

    publicstatic Object bytesToObject(byte[] bytes) throwsException{

        ByteArrayInputStream in = newByteArrayInputStream(bytes);

        ObjectInputStream sIn = newObjectInputStream(in);

        returnsIn.readObject();

    }

}

定义一个消息类，主要用于接收消息内容和消息下表的设置。

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

packagecom.bean;

 

importjava.io.Serializable;

 

/**定义消息类接收消息内容和设置消息的下标

 * @author lenovo

 *

 */

publicclass Message implementsSerializable{

    privatestatic final long serialVersionUID = 7792729L;

    privateint id;

    privateString content;

    publicint getId() {

        returnid;

    }

    publicvoid setId(intid) {

        this.id = id;

    }

    publicString getContent() {

        returncontent;

    }

    publicvoid setContent(String content) {

        this.content = content;

    }

}

利用redis做队列，我们采用的是redis中list的push和pop操作；

结合队列的特点：

只允许在一端插入新元素只能在队列的尾部FIFO：先进先出原则

redis中lpush（rpop）或rpush(lpop)可以满足要求，而redis中list 里要push或pop的对象仅需要转换成byte[]即可

java采用Jedis进行redis的存储和redis的连接池设置

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

packagecom.redis.util;

 

importjava.util.List;

importjava.util.Map;

importjava.util.Set;

 

importredis.clients.jedis.Jedis;

importredis.clients.jedis.JedisPool;

importredis.clients.jedis.JedisPoolConfig;

 

publicclass JedisUtil {

 

    privatestatic String JEDIS_IP;

    privatestatic int JEDIS_PORT;

    privatestatic String JEDIS_PASSWORD;

    //private static String JEDIS_SLAVE;

 

    privatestatic JedisPool jedisPool;

 

    static{

        Configuration conf = Configuration.getInstance();

        JEDIS_IP = conf.getString("jedis.ip","127.0.0.1");

        JEDIS_PORT = conf.getInt("jedis.port",6379);

        JEDIS_PASSWORD = conf.getString("jedis.password",null);

        JedisPoolConfig config = newJedisPoolConfig();

        config.setMaxActive(5000);

        config.setMaxIdle(256);//20

        config.setMaxWait(5000L);

        config.setTestOnBorrow(true);

        config.setTestOnReturn(true);

        config.setTestWhileIdle(true);

        config.setMinEvictableIdleTimeMillis(60000l);

        config.setTimeBetweenEvictionRunsMillis(3000l);

        config.setNumTestsPerEvictionRun(-1);

        jedisPool = newJedisPool(config, JEDIS_IP, JEDIS_PORT, 60000);

    }

 

    /**

     * 获取数据

     * @param key

     * @return

     */

    publicstatic String get(String key) {

 

        String value = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            value = jedis.get(key);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

 

        returnvalue;

    }

 

    publicstatic void close(Jedis jedis) {

        try{

            jedisPool.returnResource(jedis);

 

        }catch(Exception e) {

            if(jedis.isConnected()) {

                jedis.quit();

                jedis.disconnect();

            }

        }

    }

 

    /**

     * 获取数据

     *

     * @param key

     * @return

     */

    publicstatic byte[] get(byte[] key) {

 

        byte[] value = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            value = jedis.get(key);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

 

        returnvalue;

    }

 

    publicstatic void set(byte[] key, byte[] value) {

 

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.set(key, value);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    publicstatic void set(byte[] key, byte[] value, inttime) {

 

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.set(key, value);

            jedis.expire(key, time);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    publicstatic void hset(byte[] key, byte[] field, byte[] value) {

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.hset(key, field, value);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    publicstatic void hset(String key, String field, String value) {

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.hset(key, field, value);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    /**

     * 获取数据

     *

     * @param key

     * @return

     */

    publicstatic String hget(String key, String field) {

 

        String value = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            value = jedis.hget(key, field);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

 

        returnvalue;

    }

 

    /**

     * 获取数据

     *

     * @param key

     * @return

     */

    publicstatic byte[] hget(byte[] key, byte[] field) {

 

        byte[] value = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            value = jedis.hget(key, field);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

 

        returnvalue;

    }

 

    publicstatic void hdel(byte[] key, byte[] field) {

 

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.hdel(key, field);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    /**

     * 存储REDIS队列 顺序存储

     * @param byte[] key reids键名

     * @param byte[] value 键值

     */

    publicstatic void lpush(byte[] key, byte[] value) {

 

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            jedis.lpush(key, value);

 

        }catch(Exception e) {

 

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

 

            //返还到连接池

            close(jedis);

 

        }

    }

 

    /**

     * 存储REDIS队列 反向存储

     * @param byte[] key reids键名

     * @param byte[] value 键值

     */

    publicstatic void rpush(byte[] key, byte[] value) {

 

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            jedis.rpush(key, value);

 

        }catch(Exception e) {

 

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

 

            //返还到连接池

            close(jedis);

 

        }

    }

 

    /**

     * 将列表 source 中的最后一个元素(尾元素)弹出，并返回给客户端

     * @param byte[] key reids键名

     * @param byte[] value 键值

     */

    publicstatic void rpoplpush(byte[] key, byte[] destination) {

 

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            jedis.rpoplpush(key, destination);

 

        }catch(Exception e) {

 

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

 

            //返还到连接池

            close(jedis);

 

        }

    }

 

    /**

     * 获取队列数据

     * @param byte[] key 键名

     * @return

     */

    publicstatic List<byte[]> lpopList(byte[] key) {

 

        List<byte[]> list = null;

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            list = jedis.lrange(key, 0, -1);

 

        }catch(Exception e) {

 

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

 

            //返还到连接池

            close(jedis);

 

        }

        returnlist;

    }

 

    /**

     * 获取队列数据

     * @param byte[] key 键名

     * @return

     */

    publicstatic byte[] rpop(byte[] key) {

 

        byte[] bytes = null;

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            bytes = jedis.rpop(key);

 

        }catch(Exception e) {

 

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

 

            //返还到连接池

            close(jedis);

 

        }

        returnbytes;

    }

 

    publicstatic void hmset(Object key, Map<string, string=""> hash) {

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.hmset(key.toString(), hash);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

 

        }

    }

 

    publicstatic void hmset(Object key, Map<string, string=""> hash, inttime) {

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            jedis.hmset(key.toString(), hash);

            jedis.expire(key.toString(), time);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

 

        }

    }

 

    publicstatic List<string> hmget(Object key, String... fields) {

        List<string> result = null;

        Jedis jedis = null;

        try{

 

            jedis = jedisPool.getResource();

            result = jedis.hmget(key.toString(), fields);

 

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

 

        }

        returnresult;

    }

 

    publicstatic Set<string> hkeys(String key) {

        Set<string> result = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            result = jedis.hkeys(key);

 

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

 

        }

        returnresult;

    }

 

    publicstatic List<byte[]> lrange(byte[] key, intfrom, intto) {

        List<byte[]> result = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            result = jedis.lrange(key, from, to);

 

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

 

        }

        returnresult;

    }

 

    publicstatic Map<byte[],> hgetAll(byte[] key) {

        Map<byte[],> result = null;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            result = jedis.hgetAll(key);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

 

        }finally{

            //返还到连接池

            close(jedis);

        }

        returnresult;

    }

 

    publicstatic void del(byte[] key) {

 

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.del(key);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

    }

 

    publicstatic long llen(byte[] key) {

 

        longlen = 0;

        Jedis jedis = null;

        try{

            jedis = jedisPool.getResource();

            jedis.llen(key);

        }catch(Exception e) {

            //释放redis对象

            jedisPool.returnBrokenResource(jedis);

            e.printStackTrace();

        }finally{

            //返还到连接池

            close(jedis);

        }

        returnlen;

    }

 

}

</byte[],></byte[],></byte[]></byte[]></string></string></string></string></string,></string,></byte[]></byte[]>

Configuration主要用于读取redis配置信息

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

packagecom.redis.util;

 

importjava.io.IOException;

importjava.io.InputStream;

importjava.util.Properties;

 

publicclass Configuration extendsProperties {

 

    privatestatic final long serialVersionUID = 50440463580273222L;

 

    privatestatic Configuration instance = null;

 

    publicstatic synchronized Configuration getInstance() {

        if(instance == null) {

            instance = newConfiguration();

        }

        returninstance;

    }

 

    publicString getProperty(String key, String defaultValue) {

        String val = getProperty(key);

        return(val == null|| val.isEmpty()) ? defaultValue : val;

    }

 

    publicString getString(String name, String defaultValue) {

        returnthis.getProperty(name, defaultValue);

    }

 

    publicint getInt(String name, intdefaultValue) {

        String val = this.getProperty(name);

        return(val == null|| val.isEmpty()) ? defaultValue : Integer.parseInt(val);

    }

 

    publiclong getLong(String name, longdefaultValue) {

        String val = this.getProperty(name);

        return(val == null|| val.isEmpty()) ? defaultValue : Integer.parseInt(val);

    }

 

    publicfloat getFloat(String name, floatdefaultValue) {

        String val = this.getProperty(name);

        return(val == null|| val.isEmpty()) ? defaultValue : Float.parseFloat(val);

    }

 

    publicdouble getDouble(String name, doubledefaultValue) {

        String val = this.getProperty(name);

        return(val == null|| val.isEmpty()) ? defaultValue : Double.parseDouble(val);

    }

 

    publicbyte getByte(String name, bytedefaultValue) {

        String val = this.getProperty(name);

        return(val == null|| val.isEmpty()) ? defaultValue : Byte.parseByte(val);

    }

 

    publicConfiguration() {

        InputStream in = ClassLoader.getSystemClassLoader().getResourceAsStream("config.xml");

        try{

            this.loadFromXML(in);

            in.close();

        }catch(IOException e) {

        }

    }

}

测试redis队列

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

packagecom.quene.test;

 

importcom.bean.Message;

importcom.bean.util.ObjectUtil;

importcom.redis.util.JedisUtil;

 

publicclass TestRedisQuene {

    publicstatic byte[] redisKey = "key".getBytes();

    static{

        init();

    }

    publicstatic void main(String[] args) {

        pop();

    }

 

    privatestatic void pop() {

        byte[] bytes = JedisUtil.rpop(redisKey);

        Message msg = (Message) ObjectUtil.bytesToObject(bytes);

        if(msg != null){

            System.out.println(msg.getId()+"   "+msg.getContent());

        }

    }

 

    privatestatic void init() {

        Message msg1 = newMessage(1,"内容1");

        JedisUtil.lpush(redisKey, ObjectUtil.objectToBytes(msg1));

        Message msg2 = newMessage(2,"内容2");

        JedisUtil.lpush(redisKey, ObjectUtil.objectToBytes(msg2));

        Message msg3 = newMessage(3,"内容3");

        JedisUtil.lpush(redisKey, ObjectUtil.objectToBytes(msg3));

    }

 

}

测试结果如下：

?

1

1  内容1

?

1

2  内容2

?

1

3  内容3